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Subaru Impreza 2006 Diagnostics
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Subaru Impreza 2006 Diagnostics

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ABS (DIAGNOSTICS)

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Summary of Contents for Subaru Impreza 2006

  • Page 1 ABS (DIAGNOSTICS)
  • Page 2 1) Turn the ignition switch to OFF. 2) Connect the Subaru Select Monitor to data link connector. 3) Turn the ignition switch to ON and Subaru Select Monitor power switch to ON. NOTE: If the communication function of the Subaru Se- lect Monitor cannot be executed normally, check the communication circuit.
  • Page 3 Diagnostic Trouble Code (DTC).> 2) Fix the wrong part. 3) Perform clear memory mode. <Ref. to ABS(diag)-17, CLEAR MEMORY MODE, OPERATION, Subaru Select Monitor.> 4) Perform the inspection mode. <Ref. to ABS(diag)-25, Inspection Mode.> 5) Read the DTC. <Ref. to ABS(diag)-16, READ DIAGNOSTIC TROUBLE CODE (DTC), OPERATION, Subaru Select Monitor.>...
  • Page 4 Check List for Interview ABS (DIAGNOSTICS) 2. Check List for Interview A: CHECK Check the following items about the vehicle’s state. 1. STATE OF ABS WARNING LIGHT ❏ Always ABS warning light ❏ Sometimes comes on. ❏ Only once ❏ Not come on •...
  • Page 5 Check List for Interview ABS (DIAGNOSTICS) 2. STATE OF BRAKE WARNING LIGHT ❏ Always Brake warning light ❏ Sometimes comes on. ❏ Only once ❏ Not come on ❏ When pulling the parking brake lever up. ❏ When releasing the parking brake lever down. •...
  • Page 6 Check List for Interview ABS (DIAGNOSTICS) 3. SYMPTOMS ❏ Does not move. ABS operating condi- tion ❏ Operates only when applying an abrupt brake. Vehicle speed: km/h • How to step on brake pedal: a) Operating time: Sec. b) Operating noise: ❏ Occurs. / ❏ Does not occur. •...
  • Page 7 Check List for Interview ABS (DIAGNOSTICS) 4. CONDITIONS UNDER WHICH TROUBLE OCCURS ❏ Fine Environment a) Weather ❏ Cloudy ❏ Rainy ❏ Snowy ❏ Others: °C (°F) b) Ambient temperature ❏ Inner city c) Road ❏ Suburbs ❏ Highway ❏ Local street ❏...
  • Page 8 General Description ABS (DIAGNOSTICS) 3. General Description 6. BRAKE PAD AND ROTOR Check the brake pad and rotor. A: CAUTION • FRONT <Ref. to BR-19, INSPECTION, Front 1. SUPPLEMENTAL RESTRAINT SYSTEM Brake Pad.> <Ref. to BR-21, INSPECTION, Front Disc Rotor.> “AIRBAG”...
  • Page 9 TOOL NUMBER DESCRIPTION REMARKS 18482AA010 CARTRIDGE Troubleshooting for electrical systems. (Newly adopted tool) ST18482AA010 22771AA030 SUBARU SELECT Troubleshooting for electrical systems. MONITOR KIT ST22771AA030 2. GENERAL PURPOSE TOOL TOOL NAME REMARKS Circuit tester Used for measuring resistance, voltage and amperage.
  • Page 10 (STI model) Connector Wheel cylinder ABS warning light G sensor (13) Yaw rate & lateral G sensor (STI model) Data link connector (for Subaru Stop light switch Select Monitor) (10) Master cylinder (14) Transmission control module (AT model)
  • Page 11 Electrical Component Location ABS (DIAGNOSTICS) (11) ABS00563 ABS00798 ABS00658 EN-01150 FRONT REAR ABS00659 ABS00660 (13) ABS00651 ABS(diag)-11...
  • Page 12 Control Module I/O Signal ABS (DIAGNOSTICS) 5. Control Module I/O Signal A: ELECTRICAL SPECIFICATION B301 7 8 9 10 11 16 17 18 22 23 24 25 26 ABS00409 ABS control module and hydraulic control unit (ABSCM&H/U) con- nector NOTE: •...
  • Page 13 8 — 15 1.5 seconds and less than 1.5 V after 1.5 seconds passed. Less than 1.5 V when no data is received. Subaru Select Monitor 7 — 15 0 ←→ 12 V pulse (in communication) Power supply *1 18 — 15 When the ignition switch is ON, 10 —...
  • Page 14 Control Module I/O Signal ABS (DIAGNOSTICS) B: WIRING DIAGRAM (30) (29) (28) (16) (17) (18) (26) (27) (19) (20) (21) (10) (11) (12) (22) (13) (23) (14) (24) (15) (25) ABS00882 Battery (12) Rear inlet solenoid valve LH (23) Front ABS wheel speed sensor Ignition switch (13) Rear outlet solenoid valve LH...
  • Page 15 Control Module I/O Signal ABS (DIAGNOSTICS) C: WAVEFORM 20 Hz : 0.12 20 Hz ABS00034 (1) ABS wheel speed sensor (2) Terminal No. (3) Standard output voltage ABS(diag)-15...
  • Page 16 • For detailed concerning the DTC, refer to the LIST OF DTC. <Ref. to ABS(diag)-34, List of Diag- ABS00112 nostic Trouble Code (DTC).> 4) Connect the Subaru Select Monitor to data link • A maximum of 3 DTCs are displayed in order of connector. occurrence.
  • Page 17 ABS OK B Signal ABS system normal/abnormal is displayed. ON or OFF NOTE: For detailed operation procedure, refer to the “SUBARU SELECT MONITOR OPERATION MANUAL”. 3. CLEAR MEMORY MODE NOTE: For detailed operation procedure, refer to the 1) On the «Main Menu» display screen, select the “SUBARU...
  • Page 18 • If freeze frame data is not properly stored in memory (due to a drop in ABSCM power supply, etc.), a DTC, preceded by a question mark “?”, ap- pears on the Subaru Select Monitor display. This shows it may be an unreliable reading. Display screen...
  • Page 19 Subaru Select Monitor ABS (DIAGNOSTICS) B: INSPECTION 1. COMMUNICATION FOR INITIALIZING IMPOSSIBLE DETECTING CONDITION: Faulty harness connector TROUBLE SYMPTOM: Communication cannot be executed between ABS and Subaru select monitor. WIRING DIAGRAM: BATTERY GENERATOR B108 IGNITION SWITCH DATA LINK CONNECTOR : TURBO MODEL...
  • Page 20 LECT MONITOR. tem displayed on Subaru 1) Turn the ignition switch to ON. Select Monitor? 2) Using the Subaru Select Monitor, check whether communication to other system can be executed normally. CHECK COMMUNICATION OF SUBARU SE- Are the name and year of sys- Replace the Go to step 6.
  • Page 21 • ABS warning light remains on. • “NO TROUBLE CODE” displayed on the Subaru Select Monitor. NOTE: When the ABS warning light is OFF and “NO TROUBLE CODE” is displayed on Subaru Select Monitor, the system is in normal condition. ABS(diag)-21...
  • Page 22 Subaru Select Monitor ABS (DIAGNOSTICS) WIRING DIAGRAM: BATTERY SBF-1 B108 IGNITION SWITCH No.13 : AUTO A/C MODEL : MANUAL A/C MODEL COMBINATION METER STI MODEL : A2 EXCEPT STI MODEL : A1 ST : STI MODEL : EXCEPT STI MODEL...
  • Page 23 Subaru Select Monitor ABS (DIAGNOSTICS) Step Check DATA CHECK SUBARU SELECT MONITOR. Is “ON” indicated? Replace the Go to step 2. 1) Select {Current Data Display & Save} in ABSCM only. Subaru Select Monitor. <Ref. to ABS-7, 2) Read the condition of “ABS warning light”.
  • Page 24 Read Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) 7. Read Diagnostic Trouble Code (DTC) A: OPERATION Refer to SUBARU SELECT MONITOR for details about reading of DTCs. <Ref. to ABS(diag)-16, Subaru Select Monitor.> ABS(diag)-24...
  • Page 25 Inspection Mode ABS (DIAGNOSTICS) 8. Inspection Mode A: PROCEDURE Reproduce the condition under which the problem has occurred as much as possible. Drive the vehicle at a speed more than 40 km/h (25 MPH) for at least 1 minute. ABS(diag)-25...
  • Page 26 Clear Memory Mode ABS (DIAGNOSTICS) 9. Clear Memory Mode A: OPERATION Refer to SUBARU SELECT MONITOR for details about how to clear DTC. <Ref. to ABS(diag)-16, Subaru Select Monitor.> ABS(diag)-26...
  • Page 27 ABS Warning Light/Brake Warning Light Illumination Pattern ABS (DIAGNOSTICS) 10.ABS Warning Light/Brake Warning Light Illumination Pattern A: INSPECTION IG SW ABS00606 Start Illuminates Parking brake ABS warning light About 2 sec. Release Goes out Brake warning light (EBD warning light) 1) When the ABS warning light does not illuminate in accordance with this illumination pattern, there must be an electrical malfunction.
  • Page 28 ABS Warning Light/Brake Warning Light Illumination Pattern ABS (DIAGNOSTICS) B: ABS WARNING LIGHT DOES NOT COME ON DETECTING CONDITION: • Defective combination meter • Defective harness TROUBLE SYMPTOM: When the ignition switch is turned to ON (engine OFF), ABS warning light does not come on. WIRING DIAGRAM: BATTERY SBF-1...
  • Page 29 ABS Warning Light/Brake Warning Light Illumination Pattern ABS (DIAGNOSTICS) Step Check CHECK ILLUMINATION OF OTHER LIGHTS. Do other warning lights illumi- Go to step 2. Check the combi- Turn the ignition switch to ON. (engine OFF) nate? nation meter. READ DTC. Is DTC displayed? Perform the diag- Go to step 3.
  • Page 30 ABS Warning Light/Brake Warning Light Illumination Pattern ABS (DIAGNOSTICS) C: ABS WARNING LIGHT DOES NOT GO OFF DETECTING CONDITION: • Defective combination meter • Open in harness TROUBLE SYMPTOM: When starting the engine, the ABS warning light is kept on. WIRING DIAGRAM: BATTERY SBF-1...
  • Page 31 ABS Warning Light/Brake Warning Light Illumination Pattern ABS (DIAGNOSTICS) Step Check READ DTC. Is DTC displayed? Perform the diag- Go to step 2. Read the DTC. <Ref. to ABS(diag)-24, Read nosis according to Diagnostic Trouble Code (DTC).> DTC. CHECK WIRING HARNESS. Is the resistance less than 0.5 Go to step 3.
  • Page 32 ABS Warning Light/Brake Warning Light Illumination Pattern ABS (DIAGNOSTICS) D: BRAKE WARNING LIGHT DOES NOT GO OFF DETECTING CONDITION: • Brake warning light circuit is shorted. • Defective sensor/connector TROUBLE SYMPTOM: After starting the engine, the brake warning light is kept on though the parking lever is released. WIRING DIAGRAM: BATTERY SBF-4...
  • Page 33 ABS Warning Light/Brake Warning Light Illumination Pattern ABS (DIAGNOSTICS) Step Check CHECK INSTALLATION OF ABSCM&H/U Is the connector correctly Go to step 2. Insert the CONNECTOR. inserted? ABSCM&H/U con- 1) Turn the ignition switch to OFF. nector until the 2) Check that the ABSCM&H/U connector is clamp locks onto inserted to ABSCM&H/U until the clamp locks onto it.
  • Page 34 <Ref. to ABS(diag)-19, COMMUNICATION FOR INITIALIZING — tializing impossible communication failure IMPOSSIBLE, INSPECTION, Subaru Select Monitor.> Although no DTC appears on the Subaru <Ref. to ABS(diag)-21, NO TROUBLE CODE, INSPECTION, Subaru — No DTC Select Monitor display, Select Monitor.> the ABS warning light remains on.
  • Page 35 List of Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Display screen Contents of diagnosis Index No. <Ref. to ABS(diag)-53, DTC 36 REAR RIGHT OUTLET VALVE MAL- Rear outlet valve RH Rear outlet valve RH FUNCTION, Diagnostic Procedure with Diagnostic Trouble Code malfunction malfunction (DTC).>...
  • Page 36 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) 12.Diagnostic Procedure with Diagnostic Trouble Code (DTC) A: DTC 21 OPEN OR SHORT CIRCUIT IN FRONT RIGHT ABS WHEEL SPEED SENSOR CIRCUIT NOTE: For the diagnostic procedure, refer to DTC 27. <Ref. to ABS(diag)-37, DTC 27 OPEN OR SHORT CIRCUIT IN REAR LEFT ABS WHEEL SPEED SENSOR CIRCUIT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>...
  • Page 37 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) D: DTC 27 OPEN OR SHORT CIRCUIT IN REAR LEFT ABS WHEEL SPEED SEN- SOR CIRCUIT DIAGNOSIS: • Faulty ABS wheel speed sensor (Broken wire, input voltage too high) • Faulty harness connector TROUBLE SYMPTOM: ABS does not operate.
  • Page 38 Subaru Select Monitor. the steering wheel is in 2) Read the ABS wheel speed sensor output straight-ahead position? corresponding to faulty system in the Subaru Select Monitor data display mode. CHECK INSTALLATION OF ABS WHEEL Are the ABS wheel speed sen- Go to step 3.
  • Page 39 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK ABS WHEEL SPEED SENSOR. Is the resistance as following Go to step 9. Replace the ABS 1) Turn the ignition switch to OFF. value? Front: 1 — 1.5 kΩ Rear: wheel speed sen- 2) Disconnect the connector from ABS wheel 1.025 —...
  • Page 40 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK BATTERY SHORT OF HARNESS. Is the voltage less than 1 V? Go to step 13. Repair the har- Measure the voltage between ABSCM&H/U ness between connector and chassis ground. ABSCM&H/U and Connector &...
  • Page 41 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK GROUND SHORT OF ABS WHEEL Is the resistance more than 1 Go to step 18. Replace the ABS SPEED SENSOR. MΩ? wheel speed sen- 1) Turn the ignition switch to ON. sor and 2) Measure the resistance between ABS ABSCM&H/U.
  • Page 42 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) E: DTC 22 FRONT RIGHT ABNORMAL ABS WHEEL SPEED SENSOR SIGNAL NOTE: For the diagnostic procedure, refer to DTC 28. <Ref. to ABS(diag)-43, DTC 28 REAR LEFT ABNORMAL ABS WHEEL SPEED SENSOR SIGNAL, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> F: DTC 24 FRONT LEFT ABNORMAL ABS WHEEL SPEED SENSOR SIGNAL NOTE: For the diagnostic procedure, refer to DTC 28.
  • Page 43 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) H: DTC 28 REAR LEFT ABNORMAL ABS WHEEL SPEED SENSOR SIGNAL DIAGNOSIS: • Faulty ABS wheel speed sensor signal (noise, irregular signal, etc.) • Faulty harness/connector TROUBLE SYMPTOM: ABS does not operate. WIRING DIAGRAM: B301 ABSCM &...
  • Page 44 Subaru Select Monitor. the steering wheel is in 2) Read the ABS wheel speed sensor output straight-ahead position? corresponding to faulty system in the Subaru Select Monitor data display mode. CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con- Repair the con- Go to step 3.
  • Page 45 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK ABS WHEEL SPEED SENSOR SIG- Is the waveform pattern on Go to step 14. Go to step 11. NAL. oscilloscope as shown in the 1) Raise all four wheels off ground. figure? 2) Turn the ignition switch to OFF.
  • Page 46 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK RESISTANCE OF ABS WHEEL Is the resistance as following Go to step 15. Replace the ABS SPEED SENSOR. value? Front: 1 — 1.5 kΩ Rear: wheel speed sen- 1) Turn the ignition switch to OFF.
  • Page 47 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK SOURCES OF SIGNAL NOISE. Is the car telephone or the Go to step 21. Properly install the wireless transmitter properly car telephone or installed? wireless transmit- ter. CHECK SOURCES OF SIGNAL NOISE. Are noise sources (such as an Install the noise Go to step 22.
  • Page 48 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) WIRING DIAGRAM: B301 ABSCM & H/U FRONT FRONT REAR REAR SENSOR LH SENSOR RH SENSOR LH SENSOR RH B301 4 5 6 7 8 9 10 11 13 14 16 17 18 19 20 21 22 23 24 25 26 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24...
  • Page 49 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK IF THE WHEELS HAVE TURNED Is the wheels have been turned The ABS is nor- Go to step 2. FREELY FOR A LONG TIME. freely for more than one mal.
  • Page 50 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK DAMAGE OF ABS WHEEL SPEED Are there broken or damaged Replace the ABS Go to step 11. SENSOR OR TONE WHEEL. teeth in the ABS wheel speed wheel speed sen- sensor piece or tone wheel? sor or tone wheel.
  • Page 51 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) J: DTC 31 FRONT RIGHT INLET VALVE MALFUNCTION NOTE: For the diagnostic procedure, refer to DTC 37. <Ref. to ABS(diag)-51, DTC 37 REAR LEFT INLET VALVE MALFUNCTION, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> K: DTC 33 FRONT LEFT INLET VALVE MALFUNCTION NOTE: For the diagnostic procedure, refer to DTC 37.
  • Page 52 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) WIRING DIAGRAM: BATTERY GENERATOR B108 IGNITION SWITCH SHORT CONNECTOR B264 B301 ABSCM & H/U B301 B264 4 5 6 7 8 9 10 11 13 14 16 17 18 19 20 21 22 23 24 25 26 ABS00836 ABS(diag)-52...
  • Page 53 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK INPUT VOLTAGE OF ABSCM&H/U. Is the voltage 10 — 15 V? Go to step 2. Repair the har- 1) Turn the ignition switch to OFF. ness connector 2) Disconnect the connector from ABSCM& between battery, H/U.
  • Page 54 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) WIRING DIAGRAM: BATTERY GENERATOR B108 IGNITION SWITCH SHORT CONNECTOR B264 B301 ABSCM & H/U B301 B264 4 5 6 7 8 9 10 11 13 14 16 17 18 19 20 21 22 23 24 25 26 ABS00836 ABS(diag)-54...
  • Page 55 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK INPUT VOLTAGE OF ABSCM&H/U. Is the voltage 10 — 15 V? Go to step 2. Repair the har- 1) Turn the ignition switch to OFF. ness connector 2) Disconnect the connector from ABSCM& between battery, H/U.
  • Page 56 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) R: DTC 41 ABS CONTROL MODULE MALFUNCTION DIAGNOSIS: Faulty ABSCM&H/U TROUBLE SYMPTOM: • ABS does not operate. • EBD does not operate. NOTE: In addition to the ABS warning light, brake warning light illuminates. WIRING DIAGRAM: B301 ABSCM &...
  • Page 57 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK GROUND CIRCUIT OF ABSCM&H/U. Is the resistance less than 0.5 Go to step 2. Repair the Ω? 1) Turn the ignition switch to OFF. ABSCM&H/U 2) Disconnect the connector from ABSCM& ground harness.
  • Page 58 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) WIRING DIAGRAM: BATTERY GENERATOR B108 IGNITION SWITCH SHORT CONNECTOR B264 B301 ABSCM & H/U B301 B264 4 5 6 7 8 9 10 11 13 14 16 17 18 19 20 21 22 23 24 25 26 ABS00836 ABS(diag)-58...
  • Page 59 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK GENERATOR. Is the voltage 10 — 17 V? Go to step 2. Repair the genera- 1) Start the engine. tor. <Ref. to 2) Idle after warm-up. SC(H4SO)-14, 3) Measure the voltage between generator B Generator.>...
  • Page 60 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) T: DTC 47 IMPROPER CAN COMMUNICATION DIAGNOSIS: CAN communication circuit is damaged or shorted. TROUBLE SYMPTOM: • ABS does not operate. (STI model) • Tight corner braking phenomenon occurs. (AT model) WIRING DIAGRAM: DRIVER'S CONTROL CENTER DIFFERENTIAL...
  • Page 61 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK MODEL TYPE. Is the vehicle STI model? Go to step 2. Go to step 11. CHECK HARNESS CONNECTOR BETWEEN Is the resistance less than 0.5 Go to step 3. Repair or replace Ω? ABSCM AND DRIVER’S CONTROL CENTER...
  • Page 62 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK POOR CONTACT IN DRIVER’S Is there poor contact? Repair poor con- Replace the CONTROL CENTER DIFFERENTIAL CON- tact in driver’s con- driver’s control TROL MODULE CONNECTOR. trol center center differential differential control control module.
  • Page 63 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK POOR CONTACT IN ABSCM CON- Is there poor contact? Repair poor con- Replace the NECTOR. tact in ABSCM ABSCM. <Ref. to connector. ABS-6, ABS Con- trol Module and Hydraulic Control Unit (ABSCM&H/ U).>...
  • Page 64 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) WIRING DIAGRAM: BATTERY SBF-3 SBF-1 IGNITION SWITCH SHORT CONNECTOR B264 B301 ABSCM & H/U VALVE RELAY MOTOR RELAY B264 B301 1 2 3 4 4 5 6 7 8 9 10 11 13 14 5 6 7 8 16 17 18 19 20...
  • Page 65 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK INPUT VOLTAGE OF ABSCM&H/U. Is the voltage 10 — 15 V? Go to step 2. Repair the har- 1) Turn the ignition switch to OFF. ness connector 2) Disconnect the connector from ABSCM& between battery H/U.
  • Page 66 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) V: DTC 52 MOTOR / MOTOR RELAY ON FAILURE DIAGNOSIS: • Faulty motor • Faulty motor relay • Faulty harness connector • Insufficient tightening of earth bolt TROUBLE SYMPTOM: • ABS does not operate. •...
  • Page 67 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) WIRING DIAGRAM: BATTERY SBF-1 IGNITION SWITCH SHORT CONNECTOR B264 B301 ABSCM & H/U VALVE RELAY MOTOR RELAY B264 B301 1 2 3 4 4 5 6 7 8 9 10 11 13 14 5 6 7 8 16 17 18 19 20...
  • Page 68 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK INPUT VOLTAGE OF ABSCM&H/U. Is the voltage 10 — 15 V? Go to step 2. Repair the har- 1) Turn the ignition switch to OFF. ness/connector 2) Disconnect the connector from ABSCM& between battery H/U.
  • Page 69 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) W: DTC 54 STOP LIGHT SWITCH SIGNAL CIRCUIT MALFUNCTION DIAGNOSIS: Faulty stop light switch WIRING DIAGRAM: BATTERY STOP LIGHT SWITCH B301 ABSCM & H/U B301 4 5 6 7 8 9 10 11 16 17 18 19 20 21 22 23 24 25 26...
  • Page 70 USING SUBARU SELECT MONITOR. 1) Select “Current data display & Save” on the Subaru Select Monitor. 2) Release the brake pedal. 3) Read the stop light switch signal in Subaru Select Monitor data display. CHECK OUTPUT OF STOP LIGHT SWITCH Is “ON” indicated? Go to step 5.
  • Page 71 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) X: DTC 56 FAULTY G SENSOR OUTPUT VOLTAGE OR OUTPUT SIGNAL DIAGNOSIS: Faulty G sensor TROUBLE SYMPTOM: ABS does not operate. WIRING DIAGRAM: B301 ABSCM & H/U B292 G SENSOR B301 B292 4 5 6 7 8 9 10 11...
  • Page 72 SUBARU SELECT MONITOR. 1) Select {Current Data Display & Save} in sensor is horizontal? Subaru Select Monitor. 2) Read the G sensor output on Subaru Select Monitor. CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con- Repair the con- Go to step 4.
  • Page 73 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK G SENSOR. Is the voltage 2.1 — 2.5 V Go to step 10. Replace the G 1) Connect the connector to G sensor. when G sensor is on a level? sensor.
  • Page 74 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Y: DTC 73 LATERAL G SENSOR OUTPUT VOLTAGE OR OUTPUT SIGNAL MALFUNCTION DIAGNOSIS: Faulty Lateral G sensor TROUBLE SYMPTOM: ABS does not operate. WIRING DIAGRAM: DRIVER'S CONTROL CENTER DIFFERENTIAL CONTROL MODULE B380 : NON-TURBO MODEL : TURBO MODEL...
  • Page 75 1) Select “Current data display & Save” on the izontal position? Subaru Select Monitor. 2) Read the Subaru Select Monitor display. CHECK OUTPUT OF YAW RATE & LATER- Go to step 4. Replace the yaw Is the voltage 6.8 —...
  • Page 76 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ABS (DIAGNOSTICS) Step Check CHECK GROUND SHORT OF HARNESS. Is the resistance more than 1 Go to step 10. Repair the har- Measure the resistance between ABSCM&H/U MΩ? ness between yaw connector and chassis ground. rate &...
  • Page 77 General Diagnostic Table ABS (DIAGNOSTICS) 13.General Diagnostic Table A: INSPECTION Symptom Probable faulty units/parts • ABSCM&H/U (solenoid valve) • ABS wheel speed sensor • Brake (caliper & piston, pads) Vehicle pulls to either side. • Wheel alignment • Tire specifications, tire wear and air pressures •...
  • Page 78 General Diagnostic Table ABS (DIAGNOSTICS) ABS(diag)-78...