2005-2008 Subaru Forester Service & Repair Manual

4AT(D)(diag)-2 Basic Diagnostic Procedure AUTOMATIC TRANSMISSION (DIAGNOSTICS) 1. Basic Diagnostic Procedure A: PROCEDURE Step Check Yes No 1 CHECK PRE-INSPECTION. 1) Ask the customer when and how the trouble occurred using the interview check list. <Ref. to 4AT(D)(diag)-4, Check List for Interview.> 2) Before performing diagnosis, inspect the following items which may influence AT problems. • General Inspection <Ref. to 4AT(D)(diag)-5, INSPECTION, General Description.> • Disconnection of harness connector • Visual check for harness damage • Oil leakage • Stall speed test <Ref. to 4AT-32, Stall Test.> • Line pressure test <Ref. to 4AT-34, Line Pres- sure Test.> • Transfer clutch pressure test <Ref. to 4AT-36, Transfer Clutch Pressure Test.> • Time lag test <Ref. to 4AT-33, Time Lag Test.> • Road test <Ref. to 4AT-31, Road Test.> • Inhibitor switch <Ref. to 4AT-47, Inhibitor Switch.> Is the unit that is thought to influence the AT problem work- ing properly? Go to step 2. Repair or replace each item. 2 CHECK AT OIL TEMP WARNING LIGHT. Turn the ignition switch to ON. Does the AT OIL TEMP warning light illuminate? Go to step 4. Go to step 3. 3 CHECK AT OIL TEMP WARNING LIGHT. 1) Turn the ignition switch to OFF. 2) Repair the AT OIL TEMP warning light circuit or power supply and ground line circuit. <Ref. to 4AT(D)(diag)-20, AT OIL TEMP Warn- ing Light Display.> 3) Turn the ignition switch to ON. Is the AT OIL TEMP warning light flashing? Go to step 4. Go to step 5. 4 CHECK INDICATION OF DTC. Display the DTC. NOTE: If the communication function of Subaru Select Monitor cannot be executed normally, check the communication circuit. <Ref. to 4AT(D)(diag)-25, COMMUNICATION FOR INITIALIZING IMPOSSIBLE, Diagnostic Procedure for Suba- ru Select Monitor Communication.> Is DTC displayed? Go to step 6. NOTE: Record all DTC. Go to step 5. 5 PERFORM GENERAL DIAGNOSTICS. 1) Inspect using “Diagnostic Procedure without Diagnostic Trouble Code (DTC)”. <Ref. to 4AT(D)(diag)-87, Diagnostic Procedure without Diagnostic Trouble Code (DTC).> 2) Inspect using “General Diagnostic Table”. <Ref. to 4AT(D)(diag)-90, General Diagnostic Table.> 3) Perform the Clear Memory Mode. 4) Perform the Inspection Mode. <Ref. to 4AT(D)(diag)-18, Inspection Mode.> 5) Display the DTC. Is DTC displayed? Go to step 6. Finish the diagnosis.

4AT(D)(diag)-3 Basic Diagnostic Procedure AUTOMATIC TRANSMISSION (DIAGNOSTICS) 6 PERFORM DIAGNOSIS. 1) Inspect using the “Diagnostic Procedure with Diagnostic Trouble Code (DTC)”. <Ref. to 4AT(D)(diag)-31, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> NOTE: For DTC table, refer to “List of Diagnostic Trou- ble Code (DTC)”. <Ref. to 4AT(D)(diag)-29, List of Diagnostic Trouble Code (DTC).> 2) Repair the trouble cause. 3) Perform the Clear Memory Mode. 4) Perform the Inspection Mode. <Ref. to 4AT(D)(diag)-18, Inspection Mode.> 5) Display the DTC. Is DTC displayed? Inspect using the “Diagnostic Proce- dure with Diagnos- tic Trouble Code (DTC)”. <Ref. to 4AT(D)(diag)-31, Diagnostic Proce- dure with Diagnos- tic Trouble Code (DTC).> Finish the diagnosis. Step Check Yes No

4AT(D)(diag)-4 Check List for Interview AUTOMATIC TRANSMISSION (DIAGNOSTICS) 2. Check List for Interview A: CHECK Check the following items when a problem has occurred. NOTE: Use copies of this page for interviewing customers. Customer’s name Date of purchase Date of repair Transmission model Transmission V.I.N. Odometer reading km (miles) Frequency Continuous Intermittent ( times a day) Weather Fine Cloudy Rainy Snowy Others ( ) Place Highland Suburbs Inner city Uphill Rough road Others ( ) Ambient air temperature Hot Warm Cool Cold Vehicle speed km/h (MPH) AT OIL TEMP warning light (AT diagnostic indicator light) Blinks continuously Does not blink Select lever position P R N D 3 2 1 Driving condition Not affected When revving at a stand- still While decelerating At starting While accelerating While turning ( R/ L) While idling While cruising Symptoms No up-shift No down-shift No kick down Vehicle does not move ( Any position Particular position) Lock-up malfunction Noise or vibration Shift shock or slip Select lever does not move Others ( )

4AT(D)(diag)-5 General Description AUTOMATIC TRANSMISSION (DIAGNOSTICS) 3. General Description A: CAUTION 1. SUPPLEMENTAL RESTRAINT SYSTEM “AIRBAG” The airbag system wiring harness is routed near the TCM. CAUTION: • The airbag system wiring harnesses and con- nectors are colored yellow. Do not use an elec- tric test equipment to check these circuits. • Be careful not to damage the airbag system wiring harness when performing TCM diagnostics or servicing. 2. MEASUREMENT When measuring the voltage and resistance of the ECM, TCM or each sensor, use a tapered pin with a diameter of less than 0.64 mm (0.025 in) in order to avoid poor contact. Do not insert a pin of more than 0.65 mm (0.026 in) diameter. B: INSPECTION 1. BATTERY Measure the battery voltage and specific gravity of the electrolyte. Standard voltage: 12 V or more Specific gravity: 1.260 or more 2. TRANSMISSION GROUND Check that the ground terminal bolt is tightened se- curely. Chassis side Tightening torque: 13 N·m (1.3 kgf-m, 9.4 ft-lb) 3. ATF LEVEL Check that the ATF level is at the specified amount. <Ref. to 4AT-28, INSPECTION, Automatic Trans- mission Fluid.> 4. FRONT DIFFERENTIAL OIL LEVEL Check the front differential oil level is the specified amount. <Ref. to 4AT-30, INSPECTION, Differen- tial Gear Oil.> 5. OPERATION OF SELECT LEVER Check there is no noise, dragging or contact pat- tern in each select lever range. WARNING: Stop the engine while checking operation of the select lever. AT-00315 (A) Upper level (B) Lower level (A) Upper level (B) Lower level AT-00316 (B) (B) (A) (A) O F O F O L O L O O HOT COLD AT-00317 (A) (B) L F AT-00413 P R N D 3 2 1

4AT(D)(diag)-6 General Description AUTOMATIC TRANSMISSION (DIAGNOSTICS) C: PREPARATION TOOL 1. SPECIAL TOOL 2. GENERAL TOOL ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 1B020XU0 SUBARU SELECT MONITOR KIT Troubleshooting the electrical system. TOOL NAME REMARKS Circuit tester Used for measuring resistance, voltage and current. Oscilloscope Used for measuring the sensor. ST1B020XU0

4AT(D)(diag)-7 Electrical Component Location AUTOMATIC TRANSMISSION (DIAGNOSTICS) 4. Electrical Component Location A: LOCATION 1. CONTROL MODULE (1) Engine control module (ECM) (3) Transmission control module (TCM) (4) Data link connector (2) AT OIL TEMP warning light (AT diagnostic indicator light) AT-00414 (1) (2) (3) (4) AT-00323 (1) (2) AT-00415 AT-03375 (3) (4) AT-00417

4AT(D)(diag)-8 Electrical Component Location AUTOMATIC TRANSMISSION (DIAGNOSTICS) 2. SENSOR (1) Front vehicle speed sensor (3) Rear vehicle speed sensor (5) ATF temperature sensor (2) Inhibitor switch (4) Torque converter turbine speed sensor AT-03376 (1) (2) (3) (4) (5) AT-04301 (1) (3) MODEL WITH MP-T AT-03379 (2) AT-03378 (1) (3) WITH VTD MODEL AT-03380 (4)

4AT(D)(diag)-9 Electrical Component Location AUTOMATIC TRANSMISSION (DIAGNOSTICS) 3. SOLENOID (1) Line pressure linear solenoid (4) Low & reverse duty solenoid (6) Transfer duty solenoid (2) High clutch duty solenoid (5) Low clutch duty solenoid (7) Lock-up duty solenoid (3) 2-4 brake duty solenoid AT-03381 (5) AT-00379 (1) (2) (3) (4) (5) (6) (7) (2) (3) (4) (7) (6) (5) (1) AT-00380

4AT(D)(diag)-10 Transmission Control Module (TCM) I/O Signal AUTOMATIC TRANSMISSION (DIAGNOSTICS) 5. Transmission Control Module (TCM) I/O Signal A: ELECTRICAL SPECIFICATION Check with ignition switch ON. Contents Measured terminal (Connector & Terminal No.) Measuring condition Voltage (V) Resistance (Ω) Positive terminal Ground terminal Backup power supply (B55) No. 25 Chassis ground Ignition switch OFF 10 — 13 — (B55) No. 26 (B55) No. 27 ACC power supply (B55) No. 12 Chassis ground Ignition switch ACC 10 — 13 — Ignition power supply (B55) No. 1 Chassis ground Ignition switch ON (engine OFF) 10 — 13 — (B55) No. 2 AT-03716 5 6 7 8 2 1 9 4 3 10 24 22 23 25 11 12 13 14 15 26 27 28 16 17 18 19 20 21 29 30 31 32 33 34 35 B55 TO 5 6 7 8 2 1 9 4 3 10 24 22 23 25 11 12 13 14 15 26 27 28 16 17 18 19 20 21 33 34 29 32 30 31 35 B54 TO

4AT(D)(diag)-11 Transmission Control Module (TCM) I/O Signal AUTOMATIC TRANSMISSION (DIAGNOSTICS) Inhibitor switch “P” range switch (B54) No. 14 Chassis ground Selector lever in “P” range Less than 1 — Selector lever in any other than “P” range 8 or more “R” range switch (B54) No. 13 Chassis ground Selector lever in “R” range Less than 1 — Selector lever in any other than “R” range 8 or more “N” range switch (B54) No. 11 Chassis ground Selector lever in “N” range Less than 1 — Selector lever in any other than “N” range 8 or more “D” range switch (B54) No. 10 Chassis ground Selector lever in “D” range Less than 1 — Selector lever in any other than “D” range 8 or more “3” range switch (B54) No. 8 Chassis ground Selector lever in “3” range Less than 1 — Selector lever in any other than “3” range 8 or more “2” range switch (B54) No. 7 Chassis ground Selector lever in “2” range Less than 1 — Selector lever in any other than “2” range 8 or more “1” range switch (B54) No. 19 Chassis ground Selector lever in “1” range Less than 1 — Selector lever in any other than “1” range 8 or more Brake switch (B54) No. 20 Chassis ground When brake pedal is depressed. 10.5 or more — When brake pedal is released. Less than 1 ATF temperature sensor (B54) No. 23 (B54) No. 12 ATF temperature 20°C (68°F) 3.5 — 4.3 2.5 k — 7 k ATF temperature 80°C (176°F) 1.0 — 2.2 300 — 800 ATF temperature sensor ground (B54) No. 12 Chassis ground — 0 Less than 1 Rear vehicle speed sensor (B54) No. 26 (B54) No. 15 Vehicle stopped 0 — Vehicle speed at least 20 km/h (12 MPH) More than 2 (AC range) Rear vehicle speed sensor ground (B54) No. 15 Chassis ground — 0 Less than 1 Check with ignition switch ON. Contents Measured terminal (Connector & Terminal No.) Measuring condition Voltage (V) Resistance (Ω) Positive terminal Ground terminal

2005-2008 Subaru Forester Service & Repair Manual

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