2010 Nissan Pathfinder Service & Repair Manual

HAC-1 VENTILATION, HEATER & AIR CONDITIONER C D E F G H J K L M SECTION HAC A B HAC N O P CONTENTS HEATER & AIR CONDITIONING CONTROL SYSTEM AUTOMATIC AIR CONDITIONER BASIC INSPECTION ................................... 4 DIAGNOSIS AND REPAIR WORKFLOW ......... 4 How to Perform Trouble Diagnosis For Quick And Accurate Repair ....................................................... 4 INSPECTION AND ADJUSTMENT .................... 5 Operational Check (Front) ........................................ 5 Operational Check (Rear) ........................................ 6 FUNCTION DIAGNOSIS .............................. 8 FUNCTION INFORMATION ............................... 8 Component Part Location ........................................ 8 Symptom Table ...................................................... 11 REFRIGERATION SYSTEM .............................13 Refrigerant Cycle ................................................... 13 Refrigerant System Protection ............................... 13 AUTOMATIC AIR CONDITIONER SYSTEM ....15 Control System Diagram ........................................ 15 Control System Description .................................... 15 Discharge Air Flow (Front) ..................................... 18 Switches And Their Control Function (Front) ......... 19 Switches And Their Control Function (Rear) .......... 20 DIAGNOSIS SYSTEM (HVAC) .........................21 CONSULT-III Function (HVAC) .............................. 21 DIAGNOSIS SYSTEM (BCM) ...........................22 CONSULT-III Function (BCM - COMMON ITEM) .... 22 CONSULT-III Function (BCM - AIR CONDITION- ER) ......................................................................... 23 SELF-DIAGNOSIS FUNCTION .........................24 A/C Auto Amp. Self-Diagnosis ............................... 24 A/C and AV Switch Assembly Self-Diagnosis ........ 24 A/C System Self-Diagnosis Code Chart ................. 25 COMPONENT DIAGNOSIS ........................ 26 MODE DOOR MOTOR ...................................... 26 System Description .................................................26 Mode Door Motor (Front) Component Function Check .....................................................................27 Mode Door Motor (Front) Diagnosis Procedure .....27 AIR MIX DOOR MOTOR ................................... 31 System Description .................................................31 Air Mix Door Motor (Driver) Component Function Check .....................................................................32 Air Mix Door Motor (Driver) Diagnosis Procedure ....33 Air Mix Door Motor (Passenger) Component Function Check .......................................................36 Air Mix Door Motor (Passenger) Diagnosis Proce- dure ........................................................................36 INTAKE DOOR MOTOR ................................... 40 System Description .................................................40 Intake Door Motor Component Function Check .....41 Intake Door Motor Diagnosis Procedure ................41 BLOWER MOTOR CONTROL SYSTEM .......... 43 System Description .................................................43 Front Blower Motor Component Function Check .... 44 Front Blower Motor Diagnosis Procedure ...............44 Front Blower Motor Component Inspection ............48 Rear Blower Motor Description ...............................49 Rear Blower Motor Component Function Check ....50 Rear Air Control (Front) Diagnosis Procedure #1....51 Rear Air Control (Rear) Diagnosis Procedure #2 ....52 Rear Air Control (Rear) Diagnosis Procedure #3 ....53 Rear Air Control (Rear) Diagnosis Procedure #4 ....56 Rear Blower Motor And Relay Component Inspec- tion ..........................................................................57 REAR AIR CONTROL SYSTEM ....................... 59 Rear Air Control System Description ......................59 Rear Air Control Component Function Check ........59 Rear Air Control (Front) Diagnosis Procedure ........60 Rear Air Control (Rear) Diagnosis Procedure ........62 MAGNET CLUTCH ........................................... 65 Revision: July 2009 2010 Pathfinder

HAC-2 System Description ................................................ 65 Magnet Clutch Component Function Check .......... 65 Magnet Clutch Diagnosis Procedure ..................... 65 WATER VALVE CIRCUIT ................................. 70 Water Valve Description (VK56DE) ....................... 70 Water Valve Diagnosis Procedure (VK56DE) ........ 70 HEATER PUMP ................................................ 72 System Description (VQ40DE) .............................. 72 Diagnosis Procedure (VQ40DE) ............................ 72 Component Inspection (VQ40DE) ......................... 74 AMBIENT SENSOR .......................................... 75 Component Description ......................................... 75 Ambient Sensor Diagnosis Procedure ................... 75 Ambient Sensor Component Inspection ................ 76 IN-VEHICLE SENSOR ...................................... 78 Component Description ......................................... 78 In-Vehicle Sensor Diagnosis Procedure ................ 78 In-Vehicle Sensor Component Inspection ............. 80 OPTICAL SENSOR .......................................... 81 Component Description ......................................... 81 Optical Sensor Diagnosis Procedure ..................... 81 INTAKE SENSOR ............................................. 83 System Description ................................................ 83 Intake Sensor Diagnosis Procedure ...................... 83 Intake Sensor Component Inspection ................... 84 POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER ......................................... 86 Component Description ......................................... 86 A/C Auto Amp. Component Function Check ......... 86 A/C Auto Amp Power and Ground Diagnosis Pro- cedure .................................................................... 87 ECU DIAGNOSIS ....................................... 88 AIR CONDITIONER CONTROL ....................... 88 A/C Auto Amp. Terminals Reference Values ........ 88 Wiring Diagram ...................................................... 90 SYMPTOM DIAGNOSIS ........................... 106 AIR CONDITIONER CONTROL ..................... 106 Symptom Matrix Chart ........................................ 106 INSUFFICIENT COOLING .............................. 107 Component Function Check ................................. 107 Diagnostic Work Flow ........................................... 108 Performance Chart ............................................... 110 Trouble Diagnoses for Abnormal Pressure .......... 111 INSUFFICIENT HEATING .............................. 115 Component Function Check ................................. 115 NOISE ............................................................. 117 Component Function Check ................................. 117 MEMORY FUNCTION DOES NOT OPERATE .. 119 Memory Function Check ...................................... 119 PRECAUTION ........................................... 120 PRECAUTIONS ............................................... 120 Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SIONER" .............................................................. 120 Working with HFC-134a (R-134a) ........................ 120 Precaution for Service Equipment ....................... 121 MANUAL AIR CONDITIONER BASIC INSPECTION ................................. 122 DIAGNOSIS AND REPAIR WORKFLOW ....... 122 How to Perform Trouble Diagnosis For Quick And Accurate Repair ................................................... 122 INSPECTION AND ADJUSTMENT ................. 123 Operational Check ............................................... 123 FUNCTION DIAGNOSIS ........................... 125 FUNCTION INFORMATION ............................ 125 Component Part Location .................................... 125 Symptom Table .................................................... 127 REFRIGERATION SYSTEM ............................ 128 Refrigerant Cycle ................................................. 128 Refrigerant System Protection ............................. 128 MANUAL AIR CONDITIONER SYSTEM ........ 130 Control System Diagram ...................................... 130 Control System Description ................................. 130 Discharge Air Flow ............................................... 132 Switches And Their Control Function ................... 132 DIAGNOSIS SYSTEM (BCM) .......................... 134 CONSULT-III Function (BCM - COMMON ITEM) . 134 CONSULT-III Function (BCM - AIR CONDITION- ER) ....................................................................... 135 COMPONENT DIAGNOSIS ...................... 136 MODE DOOR MOTOR .................................... 136 System Description .............................................. 136 Mode Door Motor (Front) Component Function Check ................................................................... 136 Mode Door Motor (Front) Diagnosis Procedure ... 137 AIR MIX DOOR MOTOR ................................. 139 System Description .............................................. 139 Air Mix Door Motor Component Function Check . 140 Air Mix Door Motor Diagnosis Procedure ............. 140 INTAKE DOOR MOTOR .................................. 143 System Description .............................................. 143 Intake Door Motor Component Function Check ... 143 Intake Door Motor Diagnosis Procedure .............. 144 BLOWER MOTOR ........................................... 146 Revision: July 2009 2010 Pathfinder

HAC-3 C D E F G H J K L M A B HAC N O P System Description .............................................. 146 Front Blower Motor Component Function Check .. 146 Front Blower Motor Diagnosis Procedure ............ 147 Front Blower Motor Component Inspection .......... 150 MAGNET CLUTCH .......................................... 153 System Description .............................................. 153 Magnet Clutch Component Function Check ........ 153 Magnet Clutch Diagnosis Procedure .................... 153 INTAKE SENSOR ........................................... 157 System Description .............................................. 157 Intake Sensor Diagnosis Procedure ..................... 157 Intake Sensor Component Inspection .................. 158 POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER ....................................... 160 Component Description ........................................ 160 Front Air Control Component Function Check ..... 160 Front Air Control Power and Ground Diagnosis Procedure ............................................................. 160 ECU DIAGNOSIS ...................................... 162 AIR CONDITIONER CONTROL ...................... 162 System Description .............................................. 162 System Operation ................................................ 162 Front Air Control Terminals Reference Values .... 163 Wiring Diagram ..................................................... 165 SYMPTOM DIAGNOSIS ........................... 172 AIR CONDITIONER CONTROL ...................... 172 Symptom Matrix Chart ........................................ 172 INSUFFICIENT COOLING .............................. 173 Component Function Check ................................. 173 Diagnostic Work Flow ........................................... 174 Performance Chart ............................................... 176 Trouble Diagnoses for Abnormal Pressure .......... 177 INSUFFICIENT HEATING ............................... 181 Component Function Check ................................. 181 NOISE .............................................................. 183 Component Function Check ................................. 183 PRECAUTION ........................................... 185 PRECAUTIONS ............................................... 185 Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SIONER" .............................................................. 185 Working with HFC-134a (R-134a) ........................ 185 Precaution for Service Equipment ........................ 186 Revision: July 2009 2010 Pathfinder

HAC-4 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] DIAGNOSIS AND REPAIR WORKFLOW BASIC INSPECTION DIAGNOSIS AND REPAIR WORKFLOW How to Perform Trouble Diagnosis For Quick And Accurate Repair INFOID:0000000005256899 WORK FLOW 1.LISTEN TO CUSTOMER COMPLAINT Listen to customer complaint. Get detailed information about the conditions and environment when the symptom occurs. >> GO TO 2 2.CHECK FOR SERVICE BULLETINS Check for any service bulletins. >> GO TO 3. 3.VERIFY THE SYMPTOM WITH OPERATIONAL CHECK Verify the symptom with operational check. Refer to HAC-123, " Operational Check " . Can a symptom be duplicated? YES >> GO TO 4 NO >> GO TO 5 4.GO TO APPROPRIATE TROUBLE DIAGNOSIS Go to appropriate trouble diagnosis. Refer to HAC-172, " Symptom Matrix Chart " . Can a symptom be duplicated? >> GO TO 5. 5.PERFORM THE A/C AUTO AMP SELF-DIAGNOSIS Perform A/C auto amp. self-diagnosis. Refer to HAC-24, " A/C Auto Amp. Self-Diagnosis " . >> If any diagnostic trouble codes set. Refer to HAC-25, " A/C System Self-Diagnosis Code Chart " . >> Confirm the repair by performing operational check. Refer to HAC-123, " Operational Check " . Revision: July 2009 2010 Pathfinder

INSPECTION AND ADJUSTMENT HAC-5 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] C D E F G H J K L M A B HAC N O P INSPECTION AND ADJUSTMENT Operational Check (Front) INFOID:0000000005256900 The purpose of the operational check is to confirm that the system operates properly. CHECKING MEMORY FUNCTION 1. Set the temperature to 32°C (90°F). 2. Press the OFF switch. 3. Turn ignition switch OFF. 4. Turn ignition switch ON. 5. Press the AUTO switch. 6. Confirm that the set temperature remains at previous temperature. 7. Press the OFF switch. If NG, go to trouble diagnosis procedure for HAC-119, " Memory Function Check " . If OK, continue with next check. CHECKING BLOWER 1. Press the blower speed control switch (+) once, blower should operate on low speed. The fan display should have one bar lit (on display). 2. Press the blower speed control switch (+) again, and continue checking blower speed and fan display until all speeds are checked. 3. Leave blower on maximum speed. If NG, go to trouble diagnosis procedure for HAC-147, " Front Blower Motor Diagnosis Procedure " . If OK, continue with next check. CHECKING DISCHARGE AIR 1. Press MODE switch four times and the DEF switch. 2. Each position indicator should change shape (on display). 3. Confirm that discharge air comes out according to the air distribution table. Refer to HAC-18, " Discharge Air Flow (Front) " . Mode door position is checked in the next step. If NG, go to trouble diagnosis procedure for HAC-137, " Mode Door Motor (Front) Diagnosis Procedure " . If OK, continue the check. NOTE: Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh when the FOOT, DEF or D/F is selected. CHECKING RECIRCULATION ( , ONLY) 1. Press recirculation ( ) switch one time. Recirculation indicator should illuminate. 2. Press recirculation ( ) switch one more time. Recirculation indicator should go off. 3. Listen for intake door position change (blower sound should change slightly). If NG, go to trouble diagnosis procedure for HAC-144, " Intake Door Motor Diagnosis Procedure " . If OK, continue the check. NOTE: Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh when the FOOT, DEF or D/F is selected. REC ( ) is not allowed in DEF ( ) D/F ( ) or FOOT ( ). CHECKING TEMPERATURE DECREASE 1. Rotate temperature control dial (drive or passenger) counterclockwise until 18°C (60°F) is displayed. 2. Check for cold air at appropriate discharge air outlets. Conditions : Engine running and at normal operating temperature Revision: July 2009 2010 Pathfinder

2010 Nissan Pathfinder Service & Repair Manual

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