Komatsu Wheel Loader WA270-7 USA sn:A27001 and up Workshop Service Manual

CEBM027600 Shop Manual WA270 -7 WHEEL LOADER SERIAL NUMBERS WA270-7 A27001 and up ENGINE 6D107E-2

SHOP MANUAL WHEEL LOADER WA270-7 Model WA270-7 Serial Number A27001 and up 00 Index and foreword 1 00 Index and foreword WA270-7 00-1

00 Index and foreword Index Index (ALL-0310-001-A-00-A) 00 Index and foreword ....................................................................................................................... 00-1 Index ......................................................................................................................................... 00-2 Foreword, safety and general information ................................................................................... 00-17 Important safety notice ....................................................................................................... 00-17 How to read the shop manual .............................................................................................. 00-24 Explanation of terms for maintenance standard .................................................................... 00-26 Handling equipment of fuel system devices .......................................................................... 00-28 Handling of intake system parts ........................................................................................... 00-29 Handling of hydraulic equipment .......................................................................................... 00-30 Method of disconnecting and connecting of push-pull type coupler ......................................... 00-32 Handling of electrical equipment .......................................................................................... 00-35 How to read electric wire code ............................................................................................. 00-43 Precautions when performing operation ............................................................................... 00-46 Practical use of KOMTRAX ................................................................................................. 00-51 Standard tightening torque table .......................................................................................... 00-52 List of abbreviation ............................................................................................................. 00-58 Conversion table ................................................................................................................ 00-63 01 Specification................................................................................................................................. 01-1 Table of contents ........................................................................................................................ 01-2 Specifications ............................................................................................................................. 01-3 Specification drawing ........................................................................................................... 01-3 Specifications ...................................................................................................................... 01-5 Weight table ...................................................................................................................... 01-10 Table of fuel, coolant, and lubricants .................................................................................... 01-12 10 Structure and function ................................................................................................................... 10-1 Table of contents ........................................................................................................................ 10-2 Engine and cooling system .......................................................................................................... 10-4 Engine related parts ............................................................................................................. 10-4 KVGT.................................................................................................................................. 10-6 EGR system piping drawing ................................................................................................ 10-13 EGR system circuit diagram ................................................................................................ 10-15 EGR valve ......................................................................................................................... 10-17 EGR cooler........................................................................................................................ 10-19 KCCV layout drawing ......................................................................................................... 10-20 KCCV ventilator ................................................................................................................. 10-22 KDPF ................................................................................................................................ 10-24 Cooling system .................................................................................................................. 10-28 Cooling fan motor ............................................................................................................... 10-30 Power train............................................................................................................................... 10-40 Power train system............................................................................................................. 10-40 Layout of power train parts .................................................................................................. 10-42 Damper ............................................................................................................................. 10-43 HST pump ......................................................................................................................... 10-44 HST motor1 ....................................................................................................................... 10-57 HST motor2 ....................................................................................................................... 10-59 Transfer ............................................................................................................................ 10-64 Clutch solenoid valve ......................................................................................................... 10-71 Drive shaft ......................................................................................................................... 10-73 Axle .................................................................................................................................. 10-74 Differential ......................................................................................................................... 10-76 Torque proportional differential ............................................................................................ 10-80 Limited slip differential ........................................................................................................ 10-82 Final drive ......................................................................................................................... 10-87 Steering system........................................................................................................................ 10-90 Layout of steering devices .................................................................................................. 10-90 Steering column ................................................................................................................. 10-91 Priority valve ...................................................................................................................... 10-92 Cushion valve .................................................................................................................... 10-96 00-2 WA270-7

00 Index and foreword Index Emergency steering valve................................................................................................... 10-97 Orbitrol valve ................................................................................................................... 10-100 2way restrictor valve......................................................................................................... 10-106 Brake system ......................................................................................................................... 10-107 Layout of brake parts ........................................................................................................ 10-107 Brake accumulator charge valve........................................................................................ 10-109 Brake valve ..................................................................................................................... 10-114 Brake accumulator ........................................................................................................... 10-118 Slack adjuster .................................................................................................................. 10-119 Brake .............................................................................................................................. 10-121 Parking brake control ....................................................................................................... 10-124 Parking brake .................................................................................................................. 10-125 Parking brake solenoid valve ............................................................................................ 10-126 Undercarriage and frame ......................................................................................................... 10-128 Axle mount ...................................................................................................................... 10-128 Center hinge pin .............................................................................................................. 10-130 Tire ................................................................................................................................. 10-131 Hydraulic system .................................................................................................................... 10-133 Hydraulic component layout .............................................................................................. 10-133 Work equipment control .................................................................................................... 10-135 Hydraulic tank .................................................................................................................. 10-136 Double type gear pump .................................................................................................... 10-139 Steering and work equipment pump ................................................................................... 10-140 Control valve ................................................................................................................... 10-152 CLSS .............................................................................................................................. 10-162 Hydraulic circuit diagram and names of valves.................................................................... 10-166 Self-pressure reducing valve ............................................................................................. 10-179 Work equipment PPC valve .............................................................................................. 10-184 Work equipment lock solenoid valve .................................................................................. 10-192 PPC circuit accumulator ................................................................................................... 10-193 ECSS accumulator ........................................................................................................... 10-194 Work equipment ..................................................................................................................... 10-195 Work equipment linkage ................................................................................................... 10-195 Bucket ............................................................................................................................ 10-196 Cab and its attachments .......................................................................................................... 10-197 ROPS cab ....................................................................................................................... 10-197 Cab mount ...................................................................................................................... 10-199 Electrical system .................................................................................................................... 10-200 Engine control system ...................................................................................................... 10-200 Preheating system ........................................................................................................... 10-203 Engine output limit function ............................................................................................... 10-205 Automatic warm-up function .............................................................................................. 10-206 Parking brake control system ............................................................................................ 10-207 System operating lamp function......................................................................................... 10-211 Battery disconnect switch function ..................................................................................... 10-212 HST controller system....................................................................................................... 10-214 Machine monitor system ................................................................................................... 10-254 Rearview monitor system.................................................................................................. 10-275 KOMTRAX system ........................................................................................................... 10-278 System component parts .................................................................................................. 10-281 Sensor ............................................................................................................................ 10-304 20 Standard value tables.................................................................................................................... 20-1 Table of contents ........................................................................................................................ 20-2 Standard service value table ........................................................................................................ 20-3 Standard value table for engine ............................................................................................. 20-3 Standard value table for machine .......................................................................................... 20-5 Standard value table for electrical system............................................................................. 20-17 30 Testing and adjusting .................................................................................................................... 30-1 Table of contents ........................................................................................................................ 30-2 WA270-7 00-3

00 Index and foreword Index Related information on testing and adjusting ................................................................................. 30-4 Tools for testing and adjusting ............................................................................................... 30-4 Sketch of tools for testing and adjusting ............................................................................... 30-10 Engine and cooling system ........................................................................................................ 30-11 Testing engine speed ......................................................................................................... 30-11 Testing boost pressure ....................................................................................................... 30-12 Testing exhaust gas temperature ......................................................................................... 30-14 Testing exhaust gas color ................................................................................................... 30-15 Testing and adjusting valve clearance .................................................................................. 30-17 Testing compression pressure ............................................................................................. 30-19 Testing blowby pressure ..................................................................................................... 30-23 Testing engine oil pressure ................................................................................................. 30-24 Testing EGR valve and KVGT driving oil pressure ................................................................. 30-25 Testing fuel pressure .......................................................................................................... 30-26 Testing fuel discharge, return and leakage............................................................................ 30-30 Bleeding air from fuel system .............................................................................................. 30-35 Testing fuel circuit for leakage ............................................................................................. 30-37 Handling cylinder cutout mode operation .............................................................................. 30-38 Handling no-injection cranking operation .............................................................................. 30-39 Testing of KDPF and muffler stack for looseness and damage ............................................... 30-40 Testing of installed condition of cylinder heads and manifolds ................................................ 30-41 Testing engine piping for damage and looseness .................................................................. 30-42 Testing and adjusting air conditioner compressor belt tension ................................................ 30-43 Replacing alternator belt ..................................................................................................... 30-44 Power train............................................................................................................................... 30-45 Testing oil leakage from axle final drive ................................................................................ 30-45 Testing drive shaft for looseness, backlash, and damage ....................................................... 30-46 Testing accelerator pedal .................................................................................................... 30-47 Testing and adjusting HSToil pressure................................................................................. 30-48 Testing transfer clutch control pressure ................................................................................ 30-51 Steering system........................................................................................................................ 30-52 Testing directional lever ...................................................................................................... 30-52 Testing steering wheel ........................................................................................................ 30-53 Testing work equipment control lever ................................................................................... 30-55 Testing and adjusting steering circuit oil pressure .................................................................. 30-57 Bleeding air from steering cylinder circuit ............................................................................. 30-59 Brake system ........................................................................................................................... 30-60 Testing brake pedal ............................................................................................................ 30-60 Testing braking performance ............................................................................................... 30-61 Testing and adjusting of accumulator charge pressure........................................................... 30-62 Testing wheel brake oil pressure.......................................................................................... 30-64 Testing lowering of wheel brake pressure ............................................................................. 30-65 Testing wear of wheel brake disc ......................................................................................... 30-67 Bleeding air from wheel brake circuit .................................................................................... 30-68 Releasing remaining pressure in brake accumulator circuit .................................................... 30-69 Testing parking brake performance ...................................................................................... 30-70 Testing wear of parking brake disc ....................................................................................... 30-71 Testing parking brake release pressure ................................................................................ 30-72 Method of releasing parking brake manually ......................................................................... 30-73 Hydraulic system ...................................................................................................................... 30-74 Testing cooling fan speed ................................................................................................... 30-74 Testing cooling fan pump circuit oil pressure ......................................................................... 30-75 Bleeding air from hydraulic fan circuit ................................................................................... 30-77 Testing and adjusting work equipment PPC oil pressure ........................................................ 30-78 Testing and adjusting work equipment oil pressure ................................................................ 30-80 Bleeding air from work equipment circuit .............................................................................. 30-84 Releasing remaining pressure from work equipment circuit .................................................... 30-85 Testing ECSS accumulator nitrogen gas pressure and procedure for charging accumulator with nitrogen gas ......................................................................................................... 30-87 00-4 WA270-7

00 Index and foreword Index Work equipment ....................................................................................................................... 30-91 Testing and adjusting bucket positioner and bucket proximity switch ....................................... 30-91 Testing and adjusting boom position detection lever .............................................................. 30-93 Electrical system ...................................................................................................................... 30-94 Adjusting replaced, reassembled or added sensor, controller, etc. with machine monitor ................................................................................................................ 30-94 Special functions of machine monitor ................................................................................... 30-95 Adjusting rearview camera angle ....................................................................................... 30-173 Handling voltage circuit of engine controller ........................................................................ 30-174 Handling battery disconnect switch .................................................................................... 30-175 Testing diodes ................................................................................................................. 30-176 Pm clinic ................................................................................................................................ 30-177 Pm Clinic service ............................................................................................................. 30-177 Check sheet .................................................................................................................... 30-178 40 Troubleshooting ............................................................................................................................ 40-1 Table of contents ........................................................................................................................ 40-2 Related information on troubleshooting ....................................................................................... 40-11 Troubleshooting points ....................................................................................................... 40-11 Sequence of events in troubleshooting................................................................................. 40-13 Checks before troubleshooting ............................................................................................ 40-15 Inspection procedure before troubleshooting ........................................................................ 40-17 Preparation for troubleshooting of electrical system............................................................... 40-34 Classification and procedures for troubleshooting ................................................................. 40-40 Symptom and troubleshooting numbers ............................................................................... 40-43 Information described in troubleshooting table ...................................................................... 40-46 Procedure for troubleshooting wiring harness of pressure sensor system for open circuit ................................................................................................................... 40-48 Connector list and layout .................................................................................................... 40-51 Connector contact identification........................................................................................... 40-65 T-branch box and T-branch adapter table ........................................................................... 40-103 Fuse location table ........................................................................................................... 40-108 Precautions for KDPF (KCSF and KDOC) Cleaning and Replacement .................................. 40-111 Precautions when performing troubleshooting of machine monitor........................................ 40-114 Processing procedure of harness checker for troubleshooting of machine monitor LCD unit .................................................................................................................... 40-116 Preparation of dummy temperature sensor (for KDOC and KDPF temperature sensors)............................................................................................................. 40-121 Preparation of short circuit electrical connector (for failure codes [CA1883] and [CA3135]) .......................................................................................................... 40-122 Failure codes table ........................................................................................................... 40-123 Troubleshooting by failure code (Display of code) ...................................................................... 40-135 Failure code [2F00MA] Failure of Parking Brake Circuit ....................................................... 40-135 Failure code [2F00MB] Malfunction of Parking Brake .......................................................... 40-138 Failure code [2G42ZG] Accumulator Oil Pressure Low (Front) ............................................. 40-140 Failure code [2G43ZG] Accumulator Oil Pressure Low (Rear) .............................................. 40-142 Failure code [6091NX] HST Oil Filter Clogging ................................................................... 40-144 Failure code [7RHYKA] Disconnection of Fan Variable Control Sol....................................... 40-146 Failure code [7RHYKB] Ground Fault of Fan Variable Control Sol......................................... 40-148 Failure code [7RHYKY] Hot Short of Fan Variable Control Sol.............................................. 40-150 Failure code [879AKA] A/C Inner Sensor Open Circuit ........................................................ 40-152 Failure code [879AKB] A/C Inner Sensor Short Circuit ......................................................... 40-153 Failure code [879BKA] A/C Outer Sensor Open Circuit ........................................................ 40-154 Failure code [879BKB] A/C Outer Sensor Short Circuit ........................................................ 40-155 Failure code [879CKA] Ventilating Sensor Open Circuit ....................................................... 40-156 Failure code [879CKB] Ventilating Sensor Short Circuit ....................................................... 40-157 Failure code [879DKZ] Sunlight Sensor Open or Short Circuit .............................................. 40-158 Failure code [879EMC] Ventilation Damper Abnormality ...................................................... 40-159 Failure code [879FMC] Air Mix Damper Abnormality ........................................................... 40-160 Failure code [989L00] Engine Controller Lock Caution 1 ...................................................... 40-161 WA270-7 00-5

00 Index and foreword Index Failure code [989M00] Engine Controller Lock Caution 2 ..................................................... 40-162 Failure code [989N00] Engine Controller Lock Caution 3 ..................................................... 40-163 Failure code [A1U0N3] HC Desorb Request 1 .................................................................... 40-164 Failure code [A1U0N4] HC Desorb Request 2 .................................................................... 40-166 Failure code [B@BAZG] Eng Oil Press Low ....................................................................... 40-168 Failure code [B@BCNS] Eng Water Overheat .................................................................... 40-169 Failure code [B@BCZK] Eng Water Level Low ................................................................... 40-170 Failure code [B@CRNS] HST Oil Temp. Overheat .............................................................. 40-172 Failure code [CA115] Eng Ne and Bkup Speed Sens Error .................................................. 40-173 Failure code [CA122] Chg Air Press Sensor High Error ....................................................... 40-174 Failure code [CA123] Chg Air Press Sensor Low Error ........................................................ 40-176 Failure code [CA131] Throttle Sensor High Error................................................................. 40-178 Failure code [CA132] Throttle Sensor Low Error ................................................................. 40-180 Failure code [CA144] Coolant Temp Sens High Error .......................................................... 40-182 Failure code [CA145] Coolant Temp Sens Low Error ........................................................... 40-184 Failure code [CA153] Chg Air Temp Sensor High Error ........................................................ 40-186 Failure code [CA154] Chg Air Temp Sensor Low Error......................................................... 40-188 Failure code [CA187] Sensor 2 Supply Volt Low Error ......................................................... 40-190 Failure code [CA221] Ambient Press Sensor High Error ...................................................... 40-192 Failure code [CA222] Ambient Press Sensor Low Error ....................................................... 40-194 Failure code [CA227] Sensor 2 Supply Volt High Error......................................................... 40-196 Failure code [CA234] Eng Overspeed ................................................................................ 40-197 Failure code [CA238] Ne Speed Sensor Supply Volt Error ................................................... 40-198 Failure code [CA239] Ne Speed Sens Supply Volt High Error............................................... 40-199 Failure code [CA271] IMV/PCV1 Short Error ...................................................................... 40-200 Failure code [CA272] IMV/PCV1 Open Error ...................................................................... 40-202 Failure code [CA295] Ambient Press Sens In Range Error ................................................... 40-204 Failure code [CA322] Inj #1(L#1) Open/Short Error ............................................................. 40-205 Failure code [CA323] Inj #5(L#5) Open/Short Error ............................................................. 40-207 Failure code [CA324] Inj #3(L#3) Open/Short Error ............................................................. 40-209 Failure code [CA325] Inj #6(L#6) Open/Short Error ............................................................. 40-211 Failure code [CA331] Inj #2(L#2) Open/Short Error ............................................................. 40-213 Failure code [CA332] Inj #4(L#4) Open/Short Error ............................................................. 40-215 Failure code [CA343] ECM Critical Internal Failure .............................................................. 40-217 Failure code [CA351] Injectors Drive Circuit Error ............................................................... 40-218 Failure code [CA352] Sensor 1 Supply Volt Low Error ......................................................... 40-219 Failure code [CA356] Mass Air Flow Sensor High Error ....................................................... 40-221 Failure code [CA357] Mass Air Flow Sensor Low Error ........................................................ 40-223 Failure code [CA386] Sensor 1 Supply Volt High Error......................................................... 40-225 Failure code [CA428] Water in Fuel Sensor High Error ........................................................ 40-226 Failure code [CA429] Water in Fuel Sensor Low Error ......................................................... 40-228 Failure code [CA431] Idle Validation Sw Error ..................................................................... 40-230 Failure code [CA432] Idle Validation Process Error ............................................................. 40-233 Failure code [CA435] Eng Oil Press Sw Error ..................................................................... 40-236 Failure code [CA441] Battery Voltage Low Error ................................................................. 40-237 Failure code [CA442] Battery Voltage High Error ................................................................. 40-239 Failure code [CA449] Rail Press Very High Error................................................................. 40-240 Failure code [CA451] Rail Press Sensor High Error ............................................................. 40-241 Failure code [CA452] Rail Press Sensor Low Error ............................................................. 40-243 Failure code [CA488] Chg Air Temp High Torque Derate...................................................... 40-245 Failure code [CA515] Rail Press Sens Sup Volt High Error .................................................. 40-246 Failure code [CA516] Rail Press Sens Sup Volt Low Error ................................................... 40-248 Failure code [CA553] Rail Press High Error ........................................................................ 40-250 Failure code [CA555] Crankcase Press High Error 1 ........................................................... 40-251 Failure code [CA556] Crankcase Press High Error 2 ........................................................... 40-252 Failure code [CA559] Rail Press Low Error ......................................................................... 40-253 Failure code [CA595] Turbo Speed High Error 2 ................................................................. 40-255 Failure code [CA687] Turbo Speed Low Error ..................................................................... 40-256 Failure code [CA689] Eng Ne Speed Sensor Error .............................................................. 40-258 00-6 WA270-7

00 Index and foreword Index Failure code [CA691] Intake Air Temp Sens High Error ........................................................ 40-260 Failure code [CA692] Intake Air Temp Sens Low Error......................................................... 40-262 Failure code [CA697] ECM Internal Temp Sensor High Error................................................ 40-264 Failure code [CA698] ECM Int Temp Sensor Low Error ........................................................ 40-265 Failure code [CA731] Eng Bkup Speed Sens Phase Error ................................................... 40-266 Failure code [CA778] Eng Bkup Speed Sensor Error........................................................... 40-268 Failure code [CA1117] Persistent Data Lost Error ................................................................ 40-273 Failure code [CA1664] KDOC Malfunction.......................................................................... 40-274 Failure code [CA1691] Regeneration Ineffective ................................................................. 40-277 Failure code [CA1695] Sensor 5 Supply Volt High Error ....................................................... 40-280 Failure code [CA1696] Sensor 5 Supply Volt Low Error ....................................................... 40-281 Failure code [CA1843] Crankcase Press Sens High Error .................................................... 40-283 Failure code [CA1844] Crankcase Press Sens Low Error .................................................... 40-285 Failure code [CA1879] KDPF Delta P Sensor High Error ..................................................... 40-287 Failure code [CA1881] KDPF Delta P Sensor Low Error ...................................................... 40-289 Failure code [CA1883] KDPF Delta P Sens In Range Error .................................................. 40-291 Failure code [CA1921] KDPF Soot Load High Error 1 .......................................................... 40-295 Failure code [CA1922] KDPF Soot Load High Error 2 .......................................................... 40-298 Failure code [CA1942] Crankcase Press Sens In Range Error ............................................. 40-303 Failure code [CA1993] KDPF Delta Pressure Low Error ...................................................... 40-304 Failure code [CA2185] Throt Sensor Sup Volt High Error ..................................................... 40-307 Failure code [CA2186] Throt Sensor Sup Volt Low Error ...................................................... 40-309 Failure code [CA2249] Rail Press Very Low Error ............................................................... 40-311 Failure code [CA2271] EGR Valve Pos Sens High Error ...................................................... 40-312 Failure code [CA2272] EGR Valve Pos Sens Low Error ....................................................... 40-314 Failure code [CA2288] Turbo Speed High Error 1................................................................ 40-317 Failure code [CA2311] IMV Solenoid Error ......................................................................... 40-318 Failure code [CA2349] EGR Valve Solenoid Open Error ...................................................... 40-319 Failure code [CA2353] EGR Valve Solenoid Short Error ...................................................... 40-321 Failure code [CA2357] EGR Valve Servo Error ................................................................... 40-323 Failure code [CA2373] Exhaust Manifold Press Sens High error........................................... 40-324 Failure code [CA2374] Exhaust Manifold Press Sens Low error ........................................... 40-326 Failure code [CA2375] EGR Orifice Temp Sens High Error .................................................. 40-328 Failure code [CA2376] EGR Orifice Temp Sens Low Error ................................................... 40-330 Failure code [CA2381] KVGT Pos Sens High Error ............................................................. 40-332 Failure code [CA2382] KVGT Pos Sens Low Error .............................................................. 40-334 Failure code [CA2383] KVGT Solenoid Open Error ............................................................. 40-337 Failure code [CA2386] KVGT Solenoid Short Error ............................................................. 40-339 Failure code [CA2387] KVGT Servo Error .......................................................................... 40-341 Failure code [CA2554] Exh Manifold Press Sens In Range Error .......................................... 40-342 Failure code [CA2555] Grid Htr Relay Volt Low Error ........................................................... 40-343 Failure code [CA2556] Grid Htr Relay Volt High Error .......................................................... 40-345 Failure code [CA2637] KDOC Face Plugging ..................................................................... 40-347 Failure code [CA2639] Manual Stationary Regeneration Request......................................... 40-349 Failure code [CA2961] EGR Orifice Temp High Error 1 ........................................................ 40-352 Failure code [CA2973] Chg Air Press Sensor In Range Error ............................................... 40-353 Failure code [CA3133] KDPF Outlet Press Sens High Error ................................................. 40-354 Failure code [CA3134] KDPF Outlet Press Sens Low Error .................................................. 40-356 Failure code [CA3135] KDPF Outlet Press Sens In Range Error .......................................... 40-358 Failure code [CA3251] KDOC Inlet Temp High Error ............................................................ 40-362 Failure code [CA3253] KDOC Temp Error - Non Regeneration ............................................. 40-365 Failure code [CA3254] KDOC Outlet Temp High Error 1 ...................................................... 40-368 Failure code [CA3255] KDPF Temp Error - Non Regeneration.............................................. 40-371 Failure code [CA3256] KDPF Outlet Temp High Error 1 ....................................................... 40-374 Failure code [CA3311] KDOC Outlet Temp High Error 2....................................................... 40-377 Failure code [CA3312] KDPF Outlet Temp High Error 2 ....................................................... 40-380 Failure code [CA3313] KDOC Inlet Temp Sensor Low Error ................................................. 40-383 Failure code [CA3314] KDOC Inlet Temp Sens High Error ................................................... 40-386 Failure code [CA3315] KDOC Inlet Temp Sens In Range Error ............................................. 40-389 WA270-7 00-7

00 Index and foreword Index Failure code [CA3316] KDOC Outlet Temp Sens Low Error ................................................. 40-393 Failure code [CA3317] KDOC Outlet Temp Sens High Error ................................................. 40-396 Failure code [CA3318] KDOC Outlet Temp Sens In Range Error .......................................... 40-399 Failure code [CA3319] KDPF Outlet Temp Sens High Error ................................................. 40-403 Failure code [CA3321] KDPF Outlet Temp Sens Low Error .................................................. 40-406 Failure code [CA3322] KDPF Outlet Temp Sens In Range Error ........................................... 40-409 Failure code [CA3419] Mass Air Flow Sensor Sup Volt High Error ........................................ 40-413 Failure code [CA3421] Mass Air Flow Sensor Sup Volt Low Error ......................................... 40-415 Failure code [CA3741] Rail Press Valve Trip Error............................................................... 40-417 Failure code [D110L4] Disconnection of Battery Relay Signal............................................... 40-418 Failure code [D160KA] Disconnection of Backup Lamp Relay Output ................................... 40-420 Failure code [D160KY] Hot Short of Backup Lamp Relay Output .......................................... 40-422 Failure code [D191KA] Disconnection of Neutral Output Relay............................................. 40-424 Failure code [D191KB] Ground Fault of Neutral Output Relay .............................................. 40-426 Failure code [D191KY] Hot Short of Neutral Output Relay.................................................... 40-428 Failure code [D192KA] Disconnection of ECSS Solenoid..................................................... 40-430 Failure code [D192KB] Ground Fault of ECSS Solenoid ...................................................... 40-432 Failure code [D192KY] Hot Short of ECSS Solenoid ........................................................... 40-433 Failure code [D19JKZ] Personal Code Relay Abnormality.................................................... 40-434 Failure code [D1B0KA] Disconnection of HST Safety Relay ................................................. 40-436 Failure code [D1B0KB] Ground Fault of HST Safety Relay .................................................. 40-438 Failure code [D1B0KY] Hot Short of HST Safety Relay ........................................................ 40-440 Failure code [D1B0MC] Malfunction of HST Safety Relay .................................................... 40-442 Failure code [D1E6KA] Disconnection of Parking Brake Relay ............................................. 40-443 Failure code [D1E6KB] Ground Fault of Parking Brake Relay............................................... 40-445 Failure code [D1E6KY] Hot Short of Parking Brake Relay .................................................... 40-447 Failure code [D5ZHKA] Failure of Key SW C Signal ............................................................ 40-449 Failure code [D5ZHKB] Key SW C Signal Short Circuit ........................................................ 40-451 Failure code [D5ZHL6] Disconnection of Key SW C ............................................................ 40-453 Failure code [D811MC] KOMTRAX Error............................................................................ 40-454 Failure code [D862KA] GPS Antenna Open Circuit ............................................................. 40-455 Failure code [D8ALKA] Operating Lamp Open Circuit (KOMTRAX) ...................................... 40-456 Failure code [D8ALKB] Operating Lamp Short Circuit (KOMTRAX) ...................................... 40-458 Failure code [D8AQK4] CAN2 Discon (KOMTRAX) 2 .......................................................... 40-460 Failure code [D8AQKR] CAN2 Discon (KOMTRAX) ............................................................ 40-461 Failure code [DAF0KT] Abnormality of Non-volatile Memory (MON) ..................................... 40-463 Failure code [DAF0MB] Monitor ROM Abnormality .............................................................. 40-464 Failure code [DAF0MC] Monitor Error ................................................................................ 40-465 Failure code [DAF3KK] Controller Power Source Low (MON)............................................... 40-466 Failure code [DAF8KB] Camera Power Supply Short Circuit ................................................ 40-468 Failure code [DAFDKB] Monitor 12V Power Output Short Circuit .......................................... 40-469 Failure code [DAFGMC] GPS Module Error ........................................................................ 40-470 Failure code [DAFLKA] Operating Lamp Open Circuit (MON)............................................... 40-471 Failure code [DAFLKB] Operating Lamp Short Circuit (MON) ............................................... 40-473 Failure code [DAFQKR] CAN2 Discon (Monitor) ................................................................. 40-475 Failure code [DAJ0KK] Controller Power Source Low (HST) ................................................ 40-476 Failure code [DAJ0KT] Abnormality of Non-volatile Memory (HST) ....................................... 40-479 Failure code [DAJ0MC] HST Con Error .............................................................................. 40-480 Failure code [DAJ1KA] Disconnection of Key SW ACC (HST) .............................................. 40-481 Failure code [DAJ2KK] Solenoid Power Source Low (HST) ................................................. 40-483 Failure code [DAJ4KB] Ground Fault of Sol. Self-Holding Relay ........................................... 40-486 Failure code [DAJ4KZ] Failure of Sol. Self-Holding Relay .................................................... 40-488 Failure code [DAJ5KX] Failure of 5V Power Source 0.......................................................... 40-490 Failure code [DAJ6KX] Failure of 5V Power Source 1.......................................................... 40-492 Failure code [DAJ9KQ] Inconsistency of Model Selection (HST) .......................................... 40-494 Failure code [DAJLKA] Operating Lamp Open Circuit (HST) ................................................ 40-495 Failure code [DAJLKB] Operating Lamp Short Circuit (HST) ................................................ 40-497 Failure code [DAJQKR] CAN2 Discon ( HST Con) .............................................................. 40-499 Failure code [DAJRKR] CAN1 Discon ( HST Con) .............................................................. 40-500 00-8 WA270-7

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Komatsu Wheel Loader WA270-7 USA sn:A27001 and up Workshop Service Manual

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