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Contents Wiring diagrams Section: Anti-Lock/traction Control All sections

Vehicle Dynamics Control System (Diagnostics) (Except Wrx): Diagnosis Subaru XV GP

Anti-Lock/traction Control ~858 words

INSPECTION

Before performing diagnosis, check the following items which might affect VDC problems.

TROUBLE SYMPTOM

Communication is impossible between VDC and Subaru Select Monitor.

When the ignition switch is turned to ON (engine OFF), EBD warning light, ABS warning light, VDC OFF indicator light, and VDC warning light & VDC indicator light do not illuminate.

Note. When pressing the VDC OFF switch for 10 seconds or more, the VDC OFF indicator light goes off and cannot operate any more. When turning the ignition switch from OFF to ON, the OFF operation enabled status is restored.

StepCheckYesNo
1 CHECK OTHER INDICATOR LIGHT. Turn the ignition switch to ON.Does other indicator light illuminate soon after "ON"?Go to step 2 .Check the combination meter. < Refer to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >
2 CHECK VDCCM. When the engine does not start, display the current data of VDCCM using Subaru Select Monitor.Immediately after the ignition switch is turned to ON, is the «EBD Warning Light» ON?Go to step 3 .Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >
3 CHECK VDCCM. When the engine does not start, display the current data of VDCCM using Subaru Select Monitor.Immediately after the ignition switch is turned to ON, is the «ABS Warning Lamp» ON?Go to step 4 .Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >
4 CHECK VDCCM. When the engine does not start, display the current data of VDCCM using Subaru Select Monitor.Immediately after the ignition switch is turned to ON, is the «VDC Warning Lamp» ON?Check the combination meter. < Refer to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >

When the ignition switch is turned to ON (engine OFF), hill start assist warning light does not illuminate.

StepCheckYesNo
1 CHECK OTHER INDICATOR LIGHT. Turn the ignition switch to ON. (engine OFF)Do other indicator lights illuminate?Go to step 2 .Check the combination meter. < Refer to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >
2 READ DTC. Read the DTC. < Refer to READ DIAGNOSTIC TROUBLE CODE (DTC) . >Is DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 3 .
3 CHECK LAN SYSTEM. Perform the diagnosis for LAN system. < Refer to BASIC DIAGNOSTIC PROCEDURE . >Is there any fault in LAN system?Perform the diagnosis according to DTC for LAN system. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 4 .
4 CHECK COMBINATION METER. Check the combination meter. < Refer to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >Is combination meter OK?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Replace the combination meter. < Refer to COMBINATION METER . >

When starting the engine, the ABS warning light is kept on.

StepCheckYesNo
1 READ DTC. Read the DTC. < Refer to READ DIAGNOSTIC TROUBLE CODE (DTC) . >Is DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 2 .
2 CHECK VDCCM. Display the current data of VDCCM using Subaru Select Monitor.Is the «ABS Warning Lamp» ON?Go to step 3 .Go to step 4 .
3 READ DTC. Read the DTC after driving the vehicle at 40 km/h (25 MPH) or more.Is DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 4 .
4 CHECK LAN SYSTEM. Perform the diagnosis for LAN system. < Refer to BASIC DIAGNOSTIC PROCEDURE . >Is there any fault in LAN system?Perform the diagnosis according to DTC for LAN system. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 5 .
5 CHECK COMBINATION METER. Check the combination meter. < Refer to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >Is combination meter OK?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Replace the combination meter. < Refer to COMBINATION METER . >

When starting the engine, the VDC warning light & VDC indicator light remains lit.

StepCheckYesNo
1 READ DTC. Read the DTC. < Refer to READ DIAGNOSTIC TROUBLE CODE (DTC) . >Is DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 2 .
2 CHECK VDCCM. Display the current data of VDCCM using Subaru Select Monitor.Is the «VDC Warning Lamp» ON?Go to step 3 .Go to step 4 .
3 READ DTC. Read the DTC after driving the vehicle at 40 km/h (25 MPH) or more.Is DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 4 .
4 CHECK LAN SYSTEM. Perform the diagnosis for LAN system. < Refer to BASIC DIAGNOSTIC PROCEDURE . >Is there any fault in LAN system?Perform the diagnosis according to DTC for LAN system. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 5 .
5 CHECK COMBINATION METER. Check the combination meter. < Refer to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >Is combination meter OK?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Replace the combination meter. < Refer to COMBINATION METER . >

When starting the engine, VDC OFF indicator light is kept ON.

When starting the engine, the hill start assist warning light continues to illuminate.

StepCheckYesNo
1 READ DTC. Read the DTC. < Refer to READ DIAGNOSTIC TROUBLE CODE (DTC) . >Is DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 2 .
2 CHECK LAN SYSTEM. Perform the diagnosis for LAN system. < Refer to BASIC DIAGNOSTIC PROCEDURE . >Is there any fault in LAN system?Perform the diagnosis according to DTC for LAN system. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 3 .
3 CHECK COMBINATION METER. Check the combination meter. < Refer to SELF-DIAGNOSIS DISPLAY MODE , OPERATION, Combination Meter System. >Is combination meter OK?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Replace the combination meter. < Refer to COMBINATION METER . >

After starting the engine, the brake warning light remains lit though the parking lever is released.

DTC DETECTING CONDITION

  1. Defective ABS wheel speed sensor (broken wire, input voltage too high)
  2. Defective harness connector
  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.

DIAGNOSTIC PROCEDURE

StepCheckYesNo
1 CHECK POOR CONTACT OF CONNECTOR. Check if there is poor contact between VDCCM&H/U and ABS wheel speed sensor.Is there poor contact?Repair the connector.Go to step 2 .
2 CHECK HARNESS CONNECTOR BETWEEN VDCCM&H/U AND ABS WHEEL SPEED SENSOR. Disconnect the connector (B310) from the VDCCM&H/U. Disconnect the connector from ABS wheel speed sensor. Measure the resistance between VDCCM&H/U connector and ABS wheel speed sensor connector. Connector & terminal DTC C1211 (B310) No. 29 - (B6) No. 1: (B310) No. 17 - (B6) No. 2: DTC C1221 (B310) No. 8 - (B15) No. 1: (B310) No. 20 - (B15) No. 2: DTC C1231 (B310) No. 5 - (R72) No. 1: (B310) No. 18 - (R72) No. 2: DTC C1241 (B310) No. 19 - (R73) No. 1: (B310) No. 7 - (R73) No. 2Is the resistance less than 1 ohms?Go to step 3 .Repair the harness connector between VDCCM&H/U and ABS wheel speed sensor.
3 CHECK GROUND SHORT OF HARNESS. Measure the resistance between VDCCM&H/U connector and chassis ground. Connector & terminal DTC C1211 (B310) No. 29 - Chassis ground: DTC C1221 (B310) No. 8 - Chassis ground: DTC C1231 (B310) No. 5 - Chassis ground: DTC C1241 (B310) No. 19 - Chassis groundIs the resistance 1 Mohms or more?Go to step 4 .Repair the harness connector between VDCCM&H/U and ABS wheel speed sensor.
4 CHECK ABS WHEEL SPEED SENSOR POWER SUPPLY CIRCUIT. Connect the VDCCM&H/U connector. Turn the ignition switch to ON. Measure the voltage between ABS wheel speed sensor connector and chassis ground. Connector & terminal DTC C1211 (B6) No. 2 (+) - Chassis ground (-): DTC C1221 (B15) No. 2 (+) - Chassis ground (-): DTC C1231 (R72) No. 2 (+) - Chassis ground (-): DTC C1241 (R73) No. 2 (+) - Chassis ground (-)Is the voltage 5 - 16 V?Go to step 6 .Go to step 5 .
5 CHECK VDCCM&H/U POWER SUPPLY CIRCUIT. Turn the ignition switch to OFF. Disconnect the VDCCM&H/U connector. Turn the ignition switch to ON. Measure the voltage between VDCCM&H/U connector terminals. Connector & terminal (B310) No. 4 (+) - (B310) No. 14 (-): (B310) No. 1 (+) - (B310) No. 14 (-): (B310) No. 26 (+) - (B310) No. 14 (-)Is the voltage 10 - 15 V?Go to step 6 .Check the generator, battery and VDCCM&H/U power supply circuit.
6 CHECK ABS WHEEL SPEED SENSOR SIGNAL. Install the ABS wheel speed sensor. Prepare an oscilloscope. Check the ABS wheel speed sensor. < Refer to CHECK ABS WHEEL SPEED SENSOR UNIT , INSPECTION, Front ABS Wheel Speed Sensor. >Is the pattern the same waveform as shown in the figure?Go to step 7 .Replace the ABS wheel speed sensor. < Refer to FRONT ABS WHEEL SPEED SENSOR . >
7 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 8 .
8 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >It results from a temporary noise interference.

DIAGNOSTIC PROCEDURE

  1. Defective ABS wheel speed sensor signal (noise, irregular signal, etc.)
  2. Defective harness connector
  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.
StepCheckYesNo
1 CHECK OUTPUT OF ABS WHEEL SPEED SENSOR USING SUBARU SELECT MONITOR. Select "Current Data Display & Save" on the Subaru Select Monitor. Read the defective ABS wheel speed sensor output.Does the speed indicated on the display change in response to the speedometer reading during acceleration/deceleration when the steering wheel is in the straight-ahead position?Go to step 2 .Go to step 7 .
2 CHECK POOR CONTACT OF CONNECTOR. Turn the ignition switch to OFF.Is there poor contact of connectors between VDCCM&H/U and ABS wheel speed sensor?Repair the connector.Go to step 3 .
3 CHECK CAUSE OF SIGNAL NOISE. Make sure the radio wave devices and electronic components are installed correctly.Are the radio wave devices and electronic components installed correctly?Go to step 4 .Install the radio wave devices and electronic components properly.
4 CHECK CAUSE OF SIGNAL NOISE. Check if the noise sources (such as an antenna) are installed near the sensor harness.Are noise sources installed?Install the noise sources apart from sensor harness.Go to step 5 .
5 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 6 .
6 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >It results from a temporary noise interference.
7 CHECK INSTALLATION OF ABS WHEEL SPEED SENSOR.Is the ABS wheel speed sensor installation bolt tightened to 7.5 N.m (0.76 kgf-m, 5.5 ft-lb)?Go to step 8 .Tighten the ABS wheel speed sensor installation bolts.
8 CHECK ABS WHEEL SPEED SENSOR SIGNAL. Install the ABS wheel speed sensor. Prepare an oscilloscope. Check the ABS wheel speed sensor. < Refer to CHECK ABS WHEEL SPEED SENSOR UNIT , INSPECTION, Front ABS Wheel Speed Sensor. >Does the oscilloscope indicate the waveform pattern like shown in the figure when the tire is slowly turned? Does the oscilloscope indication repeat the waveform pattern like shown in the figure when the tire is slowly turned in equal speed for one rotation or more?Go to step 10 .Go to step 9 .
9 CHECK ABS WHEEL SPEED SENSOR OR MAGNETIC ENCODER.Are there foreign matter, breakage or damage at the tip of ABS wheel speed sensor or magnetic encoder?Remove dirt thoroughly. Also replace the ABS wheel speed sensor or magnetic encoder as a unit with hub unit bearing if it is broken or damaged.Go to step 10 .
10 CHECK CAUSE OF SIGNAL NOISE. Make sure the radio wave devices and electronic components are installed correctly.Are the radio wave devices and electronic components installed correctly?Go to step 11 .Install the radio wave devices and electronic components properly.
11 CHECK CAUSE OF SIGNAL NOISE. Check if the noise sources (such as an antenna) are installed near the sensor harness.Are noise sources installed?Install the noise sources apart from sensor harness.Go to step 12 .
12 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 13 .
13 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >It results from a temporary noise interference. NOTE: Though the ABS warning light may remain on at this time, this is normal. Drive the vehicle at 60 km/h (37 MPH) or more in order to turn ABS warning light off. Be sure to drive the vehicle and check that the warning light goes off.
NOTE
Though the ABS warning light may remain on at this time, this is normal. Drive the vehicle at 60 km/h (37 MPH) or more in order to turn ABS warning light off. Be sure to drive the vehicle and check that the warning light goes off.

DIAGNOSTIC PROCEDURE

  1. Defective ABS wheel speed sensor signal (noise, irregular signal, etc.)
  2. Defective magnetic encoder
  3. When a wheel is turned freely for a long time
  1. ABS does not operate.
  2. VDC does not operate.
  3. EBD may not operate.
  4. Hill start assist does not operate.

Note. Brake warning light comes on as well as ABS warning light when EBD does not operate.

StepCheckYesNo
1 WHETHER A WHEEL TURNED FREELY OR NOT. Check if the wheels have been turned freely for one minute or more, such as when the vehicle is jacked-up, under full-lock cornering or when the wheels are not in contact with road surface.Did the wheels turn freely?VDC is normal. Clear the memory. NOTE: This diagnostic trouble code may sometimes occur if the wheels turn freely for a long time, for example when the vehicle is towed or jacked-up, or when steering wheel is continuously turned all the way.Go to step 2 .
2 CHECK TIRE SPECIFICATIONS. Turn the ignition switch to OFF.Are the tire specifications correct?Go to step 3 .Replace the tire.
3 CHECK WEAR OF TIRE.Is the tire worn excessively?Replace the tire.Go to step 4 .
4 CHECK TIRE INFLATION PRESSURE.Is the tire pressure correct?Go to step 5 .Adjust the tire pressure.
5 CHECK INSTALLATION OF ABS WHEEL SPEED SENSOR.Are the ABS wheel speed sensor installation bolts tightened to 7.5 N.m (0.76 kgf-m, 5.5 ft-lb)? (For four wheels)Go to step 6 .Tighten the ABS wheel speed sensor installation bolts.
6 CHECK ABS WHEEL SPEED SENSOR SIGNAL. Install the ABS wheel speed sensor. Prepare an oscilloscope. Check the ABS wheel speed sensor. < Refer to CHECK ABS WHEEL SPEED SENSOR UNIT , INSPECTION, Front ABS Wheel Speed Sensor. >Does the oscilloscope indicate the waveform pattern like shown in the figure when the tire is slowly turned? Does the oscilloscope indication repeat the waveform pattern like shown in the figure when the tire is slowly turned in equal speed for one rotation or more? (For all four wheels)Go to step 8 .Go to step 7 .
7 CHECK ABS WHEEL SPEED SENSOR OR MAGNETIC ENCODER.Are there foreign matter, breakage or damage at the tip of ABS wheel speed sensor or magnetic encoder? (For all four wheels)Remove dirt thoroughly. Also replace the ABS wheel speed sensor or magnetic encoder as a unit with hub unit bearing if it is broken or damaged.Go to step 8 .
8 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 9 .
9 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >It results from a temporary noise interference.
NOTE
This diagnostic trouble code may sometimes occur if the wheels turn freely for a long time, for example when the vehicle is towed or jacked-up, or when steering wheel is continuously turned all the way.

DIAGNOSTIC PROCEDURE

  1. Defective harness connector
  2. Defective VDCH/U solenoid valve
  1. ABS does not operate.
  2. EBD does not operate.
  3. VDC does not operate.
  4. Hill start assist does not operate.
StepCheckYesNo
1 CHECK VDCCM&H/U INPUT VOLTAGE. Turn the ignition switch to OFF. Disconnect the connector from the VDCCM&H/U. Run the engine at idle. Measure the voltage between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 4 (+) - (B310) No. 14 (-): (B310) No. 1 (+) - (B310) No. 14 (-): (B310) No. 26 (+) - (B310) No. 14 (-)Is the voltage 10 - 15 V?Go to step 2 .Repair the power supply circuit.
2 CHECK VDCCM&H/U GROUND CIRCUIT. Turn the ignition switch to OFF. Measure the resistance between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 14 - Chassis groundIs the resistance less than 10 ohms?Go to step 3 .Repair the VDCCM&H/U ground harness.
3 CHECK POOR CONTACT OF CONNECTORS.Is there poor contact of connector between generator, battery and VDCCM&H/U?Repair the connector.Go to step 4 .
4 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >Go to step 5 .
5 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE

Defective VDCCM

  1. ABS does not operate.
  2. EBD does not operate.
  3. VDC does not operate.
  4. Hill start assist does not operate.
StepCheckYesNo
1 CHECK VDCCM&H/U GROUND CIRCUIT. Turn the ignition switch to OFF. Disconnect the connector from the VDCCM&H/U. Measure the resistance between VDCCM&H/U and chassis ground. Connector & terminal (B310) No. 14 - Chassis groundIs the resistance less than 10 ohms?Go to step 2 .Repair the VDCCM&H/U ground harness.
2 CHECK POOR CONTACT OF CONNECTORS.Is there poor contact of the connector between the battery, ignition switch and VDCCM&H/U?Repair the connector.Go to step 3 .
3 CHECK CAUSE OF SIGNAL NOISE.Are the radio wave devices and electronic components installed correctly?Go to step 4 .Install the radio wave devices and electronic components properly.
4 CHECK CAUSE OF SIGNAL NOISE.Is there a noise source (such as an antenna) installed near the sensor harness and VDCCM?Install the noise sources apart from sensor harness and VDCCM.Go to step 5 .
5 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 6 .
6 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE

VDCCM parameter selection error

  1. ABS does not operate.
  2. EBD does not operate.
  3. VDC does not operate.
  4. Hill start assist does not operate.

Note. When the VDCCM or VDCCM&H/U is replaced, this DTC may be stored.

StepCheckYesNo
1 CHECK VDCCM&H/U IDENTIFICATION SYMBOL. Check the identification symbol attached on the H/U. < Refer to SPECIFICATION , General Description. >Is the identification symbol correct?Go to step 2 .Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >
2 CHECK PARAMETER SELECTED IN VDCCM. < Refer to PARAMETER CHECK , OPERATION, Subaru Select Monitor. >Does the parameter registered in the VDCCM match the relevant vehicle?Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >Select and register the correct parameter. < Refer to PARAMETER SELECTION , OPERATION, Subaru Select Monitor. >

DIAGNOSTIC PROCEDURE

Improper VDCCM&H/U power supply voltage

  1. ABS does not operate.
  2. EBD may not operate.
  3. VDC does not operate.
  4. Hill start assist does not operate.

Note. Warning lights go off if voltage returns.

StepCheckYesNo
1 CHECK GENERATOR. Start the engine. Run the engine at idle after warming up. Measure the voltage between generator terminal B and chassis ground. Terminals Generator terminal B (+) - Chassis ground (-)Is the voltage 10 - 15 V?Go to step 2 .Repair the generator. < Refer to GENERATOR . >
2 CHECK BATTERY TERMINAL. Turn the ignition switch to OFF.Are the positive and negative battery terminals clamped tightly?Go to step 3 .Tighten the terminal.
3 CHECK VDCCM&H/U INPUT VOLTAGE. Disconnect the connector from the VDCCM&H/U. Run the engine at idle. Operate devices such as headlights, air conditioner, rear defogger, etc. which produce an electrical load. Measure the voltage between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 4 (+) - (B310) No. 14 (-): (B310) No. 1 (+) - (B310) No. 14 (-): (B310) No. 26 (+) - (B310) No. 14 (-)Is the voltage 10 - 15 V?Go to step 4 .Repair the power supply circuit.
4 CHECK VDCCM&H/U GROUND CIRCUIT. Turn the ignition switch to OFF. Measure the resistance between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 14 - Chassis groundIs the resistance less than 10 ohms?Go to step 5 .Repair the VDCCM&H/U ground harness.
5 CHECK POOR CONTACT OF CONNECTORS.Is there poor contact of connector between generator, battery and VDCCM&H/U?Repair the connector.Go to step 6 .
6 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 7 .
7 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE

ECM malfunctioning

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.
StepCheckYesNo
1 CHECK COOPERATION CONTROL FEASIBILITY OF ECM USING SUBARU SELECT MONITOR. Start the engine, and run the engine at idle approximately 5 minutes. Connect Subaru Select Monitor, and select "Current Data Display & Save". Check the «E/G Control Stop Flag» displayed on screen.Is the «E/G Control Stop Flag» "1"?Go to step 4 .Go to step 2 .
2 CHECK WARNING LIGHT. Check whether the VDC warning light illuminates after driving for 1 minute or more at a speed of 10 km/h (6 MPH) or more.Does the VDC warning light illuminate?Go to step 3 .VDC is normal. Perform the Clear Memory Mode. NOTE: DTC may be recorded if cranking is performed during driving.
3 CHECK POOR CONTACT OF CONNECTORS.Is there poor contact of ECM connector?Repair the connector.Go to step 4 .
4 CHECK ECM. Refer to the INSPECTION basic diagnostic procedure for Engine (diagnostics).Is ECM normal?Go to step 5 .Replace the ECM. < Refer to ENGINE CONTROL MODULE (ECM) . >
5 CHECK VDCCM&H/U. Connect all connectors. Perform the Clear Memory Mode. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 6 .
6 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >It results from a temporary noise interference.
NOTE
DTC may be recorded if cranking is performed during driving.

DIAGNOSTIC PROCEDURE

ECM prohibits the cooperation control.

VDC does not operate.

Note. For the diagnostic procedure, refer to "DTC C1421 ECM CONTROL SYSTEM". < Refer to DTC C1421 ECM CONTROL SYSTEM , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > Warning lights go off if the cooperation control of ECM returns.

Different control module specification

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.

Note. When parameter selection for VDCCM is improper, this DTC may be memorized.

StepCheckYesNo
1 CHECK VDCCM&H/U IDENTIFICATION SYMBOL. Check the identification symbol attached on the H/U. < Refer to SPECIFICATION , General Description. >Is the identification symbol correct?Go to step 2 .Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >
2 CHECK PARAMETER SELECTED IN VDCCM. < Refer to PARAMETER CHECK , OPERATION, Subaru Select Monitor. >Does the parameter registered in the VDCCM match the relevant vehicle?CVT model: Go to step 3 . MT model: Go to step 5 .Select and register the correct parameter. < Refer to PARAMETER SELECTION , OPERATION, Subaru Select Monitor. >
3 CHECK TCM SPECIFICATION. Check the TCM specification.Is the specification of TCM same as vehicle specification?Go to step 4 .Replace the TCM. < Refer to TRANSMISSION CONTROL MODULE (TCM) . >
4 CHECK CVT SYSTEM. Start the engine. Check the DTC in CVT system.Is DTC of CVT system displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 5 .
5 CHECK ECM SPECIFICATION. Check the ECM specification.Is the specification of ECM same as vehicle specification?Go to step 6 .Replace the ECM. < Refer to ENGINE CONTROL MODULE (ECM) . >
6 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 7 .
7 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >It results from a temporary noise interference.

DIAGNOSTIC PROCEDURE

ECM malfunctioning

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.
StepCheckYesNo
1 CHECK ECM. Start the engine. Check DTC of ECM.Is DTC displayed?Perform the diagnosis according to DTC.Go to step 2 .
2 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 3 .
3 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >It results from a temporary noise interference.

DIAGNOSTIC PROCEDURE

Defective TCM

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.
StepCheckYesNo
1 CHECK TCM. Start the engine. Check DTC of TCM.Is DTC displayed?Perform the diagnosis according to DTC.Go to step 2 .
2 CHECK VDCCM&H/U. Turn the ignition switch to OFF. After turning the ignition switch to ON for approx. 10 seconds, turn it to OFF. Turn the ignition switch to ON again. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 3 .
3 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >It results from a temporary noise interference.

DIAGNOSTIC PROCEDURE

Defective valve relay

  1. ABS does not operate.
  2. EBD does not operate.
  3. VDC does not operate.
  4. Hill start assist does not operate.
StepCheckYesNo
1 CHECK VDCCM&H/U INPUT VOLTAGE. Turn the ignition switch to OFF. Disconnect the connector from the VDCCM&H/U. Run the engine at idle. Measure the voltage between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 1 (+) - Chassis ground (-): (B310) No. 4 (+) - Chassis ground (-)Is the voltage 10 - 15 V?Go to step 2 .Repair the power supply circuit.
2 CHECK VDCCM&H/U INPUT VOLTAGE. Calculate the voltage difference measured in step 1. (B310) No. 1 (+) - Chassis ground (-): (B310) No. 4 (+) - Chassis ground (-)Is the voltage difference between A and B 2 V or more?Repair the power supply circuit.Go to step 3 .
3 CHECK VDCCM&H/U GROUND CIRCUIT. Turn the ignition switch to OFF. Measure the resistance between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 14 - Chassis groundIs the resistance less than 10 ohms?Go to step 4 .Repair the VDCCM&H/U ground harness.
4 CHECK POOR CONTACT OF CONNECTORS.Is there poor contact of connector between generator, battery and VDCCM&H/U?Repair the connector.Go to step 5 .
5 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 6 .
6 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE

  1. Defective motor and motor relay
  2. Defective harness connector
  1. ABS does not operate.
  2. VDC does not operate.
  3. EBD may not operate.
  4. Hill start assist does not operate.
StepCheckYesNo
1 CHECK VDCCM&H/U INPUT VOLTAGE. Turn the ignition switch to OFF. Disconnect the connector from the VDCCM&H/U. Turn the ignition switch to ON. Measure the voltage between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 4 (+) - Chassis ground (-): (B310) No. 26 (+) - Chassis ground (-)Is the voltage 10 - 15 V?Go to step 2 .Repair the VDCCM&H/U power supply circuit.
2 CHECK VDCCM&H/U INPUT VOLTAGE. Calculate the voltage difference measured in step 1. (B310) No. 4 (+) - Chassis ground (-): (B310) No. 26 (+) - Chassis ground (-)Is the voltage difference between A and B 2 V or more?Repair the power supply circuit.Go to step 3 .
3 CHECK INSTALLATION OF VDCCM&H/U GROUND.Is the VDCCM&H/U ground terminal installation bolt tightened to 13 N.m (1.3 kgf-m, 9.6 ft-lb)?Go to step 4 .Tighten the VDCCM&H/U ground terminal installation bolt.
4 CHECK VDCCM&H/U GROUND CIRCUIT. Turn the ignition switch to OFF. Measure the resistance between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 14 - Chassis ground: (B310) No. 38 - Chassis groundIs the resistance less than 10 ohms?Go to step 5 .Repair the VDCCM&H/U ground harness.
5 CHECK VDCCM&H/U MOTOR RELAY. Measure the resistance between VDCCM&H/U terminals. Terminals No. 26 - No. 38Is the resistance 1 Mohms or more?Go to step 6 .Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >
6 CHECK POOR CONTACT OF CONNECTORS. Turn the ignition switch to OFF.Is there poor contact of connector between generator, battery and VDCCM&H/U?Repair the connector.Go to step 7 .
7 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >Go to step 8 .
8 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Temporary poor contact occurs. NOTE: Though the ABS warning light, and the VDC warning light & VDC indicator light may remain lit at this point, this is normal. Drive the vehicle at 40 km/h (25 MPH) or more in order to turn off the ABS warning light, and the VDC warning light & VDC indicator light. Be sure to drive the vehicle and check that the warning light goes off.
NOTE
Though the ABS warning light, and the VDC warning light & VDC indicator light may remain lit at this point, this is normal. Drive the vehicle at 40 km/h (25 MPH) or more in order to turn off the ABS warning light, and the VDC warning light & VDC indicator light. Be sure to drive the vehicle and check that the warning light goes off.

DIAGNOSTIC PROCEDURE

Defective stop light switch

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.
StepCheckYesNo
1 CHECK STOP LIGHT SWITCH. Turn the ignition switch to OFF. Disconnect the stop light switch connector. Measure the resistance of stop light switch terminals. Connector & terminal (B65) No. 3 - No. 4Is the resistance 1 ohms or less when the switch is ON (when pedal is depressed)?Go to step 2 .Replace the stop light switch. < Refer to STOP LIGHT SWITCH . >
2 CHECK STOP LIGHT POWER SUPPLY. Measure the voltage between stop light switch terminal and chassis ground. Connector & terminal (B65) No. 3 (+) - Chassis ground (-)Is the voltage 10 - 15 V?Go to step 3 .Repair the stop light power supply circuit.
3 CHECK STOP LIGHT SWITCH HARNESS. Disconnect the connector from the VDCCM&H/U. Measure the resistance between VDCCM&H/U and stop light switch. Connector & terminal (B65) No. 4 - (B310) No. 6Is the resistance less than 1 ohms?Go to step 4 .Repair the stop light switch circuit.
4 CHECK POOR CONTACT OF CONNECTORS.Is there poor contact of connector between stop light switch and VDCCM&H/U?Repair the connector.Go to step 5 .
5 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 6 .
6 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE

Defective stop light switch

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.
StepCheckYesNo
1 CHECK STOP LIGHT SWITCH. Turn the ignition switch to OFF. Disconnect the stop light switch connector. Measure the resistance of stop light switch terminals. Connector & terminal (B65) No. 3 - No. 4Is the resistance 1 Mohms or more when switch is OFF (when pedal is not depressed)?Go to step 2 .Replace the stop light switch. < Refer to STOP LIGHT SWITCH . >
2 CHECK STOP LIGHT SWITCH HARNESS. Disconnect the connector from the VDCCM&H/U. Measure the resistance between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 6 - Chassis groundIs the resistance less than 1 Mohms?Go to step 3 .Repair the stop light switch circuit.
3 INTERVIEW CUSTOMERS. Make sure that the operation was performed in which accelerator pedal and brake pedal were depressed simultaneously (with depressing brake pedal with left foot).Were the acceleration pedal and brake pedal depressed simultaneously?System is normal. (DTC may be recorded while brake is applied during driving.)Go to step 4 .
4 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 5 .
5 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE

Abnormal clutch signal

Hill start assist does not operate.

Note. Depending on the user clutch operation patterns, the hill start assist warning light may illuminate for a while, and then go off.

StepCheckYesNo
1 CHECK LAN SYSTEM. Perform the diagnosis for LAN system. < Refer to BASIC DIAGNOSTIC PROCEDURE . >Is there any fault in LAN system?Perform the diagnosis according to DTC for LAN system. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 2 .
2 CHECK CLUTCH SIGNAL USING SUBARU SELECT MONITOR. Select "Current Data Display & Save" on the Subaru Select Monitor. < Refer to READ CURRENT DATA , OPERATION, Subaru Select Monitor. > Read the «Clutch Switch» displayed on display.Is "OFF" displayed when the clutch pedal is not depressed, and is "ON" displayed when depressed?Go to step 5 .Go to step 3 .
3 CHECK CLUTCH SIGNAL OF ECM USING SUBARU SELECT MONITOR. Select "Current Data Display & Save" on Subaru Select Monitor. < Refer to READ CURRENT DATA FOR ENGINE (NORMAL MODE) , OPERATION, Subaru Select Monitor. > Read the «Clutch Switch» displayed on display.Is "OFF" displayed when the clutch pedal is not depressed, and is "ON" displayed when depressed?Go to step 5 .Go to step 4 .
4 CHECK HARNESS BETWEEN ECM AND CLUTCH SWITCH. Turn the ignition switch to OFF. Disconnect the connectors from ECM and clutch switch. Measure the resistance of harness between ECM and clutch switch connector. Connector & terminal (B135) No. 9 - (B107) No. 2Is the resistance less than 1 ohms?Repair the power supply circuit of clutch switch. Or replace the clutch switch. < Refer to CLUTCH SWITCH . >Repair the harness between ECM and clutch switch connector.
5 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >Go to step 6 .
6 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE

Abnormal reverse signal

Hill start assist does not operate.

StepCheckYesNo
1 CHECK LAN SYSTEM. Perform the diagnosis for LAN system. < Refer to BASIC DIAGNOSTIC PROCEDURE . >Is there any fault in LAN system?Perform the diagnosis according to DTC for LAN system. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Go to step 2 .
2 CHECK REVERSE SIGNAL USING SUBARU SELECT MONITOR. Select "Current Data Display & Save" on the Subaru Select Monitor. < Refer to READ CURRENT DATA , OPERATION, Subaru Select Monitor. > Read the «Reverse Signal» displayed on display.Is "OFF" displayed when the shift lever is placed in any position other than reverse, and is "ON" displayed in reverse position?Go to step 5 .Go to step 3 .
3 CHECK BACK-UP LIGHT ILLUMINATION. Turn the ignition switch to ON. Place the shift lever in reverse position.Does the back-up light illuminate?Go to step 4 .Repair the back-up light circuit.
4 CHECK HARNESS BETWEEN BODY INTEGRATED UNIT AND BACK-UP LIGHT SWITCH. Turn the ignition switch to OFF. Disconnect the connectors from body integrated unit and back-up light switch. Measure the resistance of harness between body integrated unit and back-up light switch connector. Connector & terminal (B280) No. 12 - (B24) No. 1Is the resistance less than 1 ohms?Replace the backup light switch. < Refer to SWITCHES AND HARNESS . >Repair the harness between body integrated unit and back-up light switch connector.
5 CHECK VDCCM&H/U. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >Go to step 6 .
6 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE

Defective steering angle sensor

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.
StepCheckYesNo
1 CHECK POWER SUPPLY FOR STEERING ANGLE SENSOR. Turn the ignition switch to OFF. Disconnect the connector from steering angle sensor. Turn the ignition switch to ON. Measure the voltage between steering angle sensor and chassis ground. Connector & terminal (B231) No. 4 (+) - Chassis ground (-)Is the voltage 10 - 15 V?Go to step 2 .Repair the steering angle sensor power supply circuit.
2 CHECK GROUND CIRCUIT OF STEERING ANGLE SENSOR. Measure the resistance between steering angle sensor and chassis ground. Connector & terminal (B231) No. 1 - Chassis groundIs the resistance less than 10 ohms?Go to step 3 .Repair ground circuit in the steering angle sensor.
3 CHECK STEERING ANGLE SENSOR HARNESS. Disconnect the connector from the VDCCM&H/U. Measure the resistance between VDCCM&H/U and steering angel sensor. Connector & terminal (B231) No. 2 - (B310) No. 15: (B231) No. 3 - (B310) No. 2Is the resistance less than 1 ohms?Go to step 4 .Repair the harness between the steering angle sensor and VDCCM&H/U.
4 CHECK GROUND SHORT CIRCUIT OF STEERING ANGLE SENSOR HARNESS. Measure the resistance between steering angle sensor and chassis ground. Connector & terminal (B231) No. 2 - Chassis ground: (B231) No. 3 - Chassis groundIs the resistance 1 Mohms or more?Go to step 5 .Repair the harness between the steering angle sensor and VDCCM&H/U.
5 CHECK STEERING WHEEL. Drive the vehicle on a flat road. Park the vehicle straight. Check the steering wheel for deviation from center.Is the deviation from the center of steering wheel less than 5°?Go to step 6 .Perform the centering adjustment of steering wheel, and perform the VDC sensor midpoint setting mode. < Refer to VDC SENSOR MIDPOINT SETTING MODE , ADJUSTMENT, VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >
6 CHECK OUTPUT OF STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR. Adjust steering wheel to the center position. Connect Subaru Select Monitor, and select "Current Data Display & Save". Read the «Steering Angle Sensor» displayed on display.Is the indicated reading of the «Steering Angle Sensor» on the monitor display -10° - 10°?Perform the VDC sensor midpoint setting mode. Go to step 7 . < Refer to VDC SENSOR MIDPOINT SETTING MODE , ADJUSTMENT, VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Check the installation of the steering wheel and steering angle sensor.
7 CHECK STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR. Turn the ignition switch to OFF. Connect all connectors. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Go to step 8 .Go to step 9 .
8 CHECK VDCCM&H/U. Turn the ignition switch to OFF. Replace the steering angle sensor. < Refer to STEERING ANGLE SENSOR . > Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 10 .
9 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Temporary poor contact occurs.
10 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >Original steering angle sensor malfunction

DIAGNOSTIC PROCEDURE

Defective yaw rate & G sensor

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.
StepCheckYesNo
1 INTERVIEW CUSTOMERS. Check if the vehicle ran the road with banks or sandy surface (which does not mean a dirt road).Did the vehicle run the road with banks or sandy surface (which does not mean a dirt road)?VDCCM&H/U may record DTC when the vehicle ran the road with banks or sandy surface (which does not mean a dirt road).Go to step 2 .
2 CHECK INSTALLATION OF VDCCM&H/U.Is VDCCM&H/U installed properly without being tilted? Is the bracket deformation-free? Are the VDCCM&H/U installation bolts installed without missing or getting loose?Go to step 3 .Repair the defective part. Go to step 3 . Install VDCCM&H/U properly. Replace the bracket if faulty. Tighten the VDCCM&H/U installation bolt. < Refer to VDC CONTROL MODULE & HYDRAULIC CONTROL UNIT (VDCCM&H/U) , COMPONENT, General Description. >
3 CHECK OUTPUT OF YAW RATE & G SENSOR WITH SUBARU SELECT MONITOR. Drive the vehicle on a flat road. Park the vehicle straight. Select "Current Data Display & Save" on the Subaru Select Monitor. Read the «Yaw Rate Sensor» displayed on display.Is the reading indicated on monitor display -4 - 4 deg/s?Go to step 4 .Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >
4 CHECK OUTPUT OF STEERING ANGLE SENSOR WITH SUBARU SELECT MONITOR. Drive the vehicle on a flat road. Park the vehicle straight. Select "Current Data Display & Save" on the Subaru Select Monitor. Read the «Steering Angle Sensor» displayed on display.Is the reading indicated on monitor display -10 - 10°?Go to step 5 .Perform the centering adjustment of steering wheel.
5 CHECK VDCCM&H/U. Turn the ignition switch to OFF. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 6 .
6 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >It results from a temporary noise interference.

DIAGNOSTIC PROCEDURE

Defective lateral G sensor

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.
StepCheckYesNo
1 CHECK INSTALLATION OF VDCCM&H/U.Is VDCCM&H/U installed properly without being tilted? Is the bracket deformation-free? Are the VDCCM&H/U installation bolts installed without missing or getting loose?Go to step 2 .Repair the defective part. Go to step 2 . Install VDCCM&H/U properly. Replace the bracket if faulty. Tighten the VDCCM&H/U installation bolt. < Refer to VDC CONTROL MODULE & HYDRAULIC CONTROL UNIT (VDCCM&H/U) , COMPONENT, General Description. >
2 CHECK OUTPUT OF STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR. Park the vehicle straight on a level surface. Connect Subaru Select Monitor, and select "Current Data Display & Save". Read the «Steering Angle Sensor» displayed on display.Is the indicated reading of the steering angle sensor on the monitor display -10° - 10°?Go to step 3 .Check the installation of steering angle sensor.
3 CHECK OUTPUT OF LATERAL G SENSOR AND LONGITUDINAL G SENSOR WITH SUBARU SELECT MONITOR. Park the vehicle straight on a level surface. Connect Subaru Select Monitor, and select "Current Data Display & Save". Read the «Lateral G Sensor» and « Longitudinal G Sensor » displayed on display.Is the indicated reading of the lateral G sensor and longitudinal G sensor on the monitor display -2 - 2 m/s 2 ?Go to step 4 .Recheck from step 1, and if the problem is not solved, go to next. Go to step 7 .
4 SET 0 POINT OF LATERAL G SENSOR AND LONGITUDINAL G SENSOR WITH SUBARU SELECT MONITOR. Select "Work Support" on Subaru Select Monitor. Perform the VDC sensor midpoint setting mode. < Refer to VDC SENSOR MIDPOINT SETTING MODE , ADJUSTMENT, VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Is the 0 point setting successful?Go to step 5 .Recheck from step 1, and when the 0 point setting is not possible, replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >
5 PERFORM DRIVING TEST. Drive approximately 10 minutes, and check if the warning lights illuminate or improperly operate during driving. In a safe place, drive the vehicle while alternating acceleration and deceleration as much as possible. Did the ABS warning light or VDC warning light remain off?Does ABS or VDC operate without malfunction?Go to step 6 .Recheck from step 1, and when the warning lights illuminate or improperly operate, replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >
6 CHECK OUTPUT OF LATERAL G SENSOR AND LONGITUDINAL G SENSOR WITH SUBARU SELECT MONITOR. Park the vehicle on a level surface. Connect Subaru Select Monitor, and select "Current Data Display & Save". Read the «Lateral G Sensor» and « Longitudinal G Sensor » displayed on display.Is the indicated reading of the lateral G sensor and longitudinal G sensor on the monitor display -1.5 - 1.5 m/s 2 ?It results from a temporary noise interference.Recheck from step 1, and if the problem is not solved, replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >
7 CHECK OUTPUT OF LATERAL G SENSOR AND LONGITUDINAL G SENSOR WITH SUBARU SELECT MONITOR. Remove the VDCCM&H/U installation bolt and bracket. Keep VDCCM&H/U in a horizontal position. Connect Subaru Select Monitor, and select "Current Data Display & Save". Read the «Lateral G Sensor» and « Longitudinal G Sensor » displayed on display.When the VDCCM&H/U is in a horizontal position, is the indicated reading of the lateral G sensor and longitudinal G sensor on the monitor display -1.5 - 1.5 m/s 2 ?Check the bracket and brake pipe, and install VDCCM&H/U in a horizontal position to the vehicle.Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >

DIAGNOSTIC PROCEDURE

Defective longitudinal G sensor

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.

Note. For the diagnostic procedure, refer to "DTC C1732 LATERAL G SENSOR ABNORMAL". < Refer to DTC C1732 LATERAL G SENSOR ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >

Defective pressure sensor

  1. ABS does not operate.
  2. VDC does not operate.
  3. Hill start assist does not operate.
StepCheckYesNo
1 CHECK STOP LIGHT SWITCH CIRCUIT. Check stop light switch open circuit.Is the stop light switch circuit OK?Go to step 2 .Repair the stop light switch circuit. NOTE: If there is malfunction in the stop light circuit, DTC may be recorded in the memory.
2 CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR. Select "Current Data Display & Save" in Subaru Select Monitor. < Refer to READ CURRENT DATA , OPERATION, Subaru Select Monitor. > Read the «Pressure Sensor» displayed on display.With the brake pedal released, is the displayed value 0 - 11 bar?Go to step 3 .Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >
3 CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR. Select "Current Data Display & Save" in Subaru Select Monitor. < Refer to READ CURRENT DATA , OPERATION, Subaru Select Monitor. > Read the «Pressure Sensor» displayed on display.When the brake pedal is operated, does the pressure sensor output value displayed on the display change in accordance with the brake pedal?Go to step 4 .Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >
4 CHECK PRESSURE SENSOR. Clear the memory. < Refer to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Refer to INSPECTION MODE . > Read the DTC.Is the same DTC displayed?Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >Go to step 5 .
5 CHECK OTHER DTC DETECTION.Is any other DTC displayed?Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >It results from a temporary noise interference.
NOTE
If there is malfunction in the stop light circuit, DTC may be recorded in the memory.

DIAGNOSTIC PROCEDURE

ABS and VDC long time sequential control

  1. ABS does not operate.
  2. VDC does not operate.
  3. EBD may not operate.
  4. Hill start assist does not operate.
StepCheckYesNo
1 CHECK INSTALLATION OF VDCCM&H/U.Is VDCCM&H/U installed properly without being tilted? Is the bracket deformation-free? Are the VDCCM&H/U installation bolts installed without missing or getting loose?Go to step 2 .Repair the defective part. Go to step 2 . Install VDCCM&H/U properly. Replace the bracket if faulty. Tighten the VDCCM&H/U installation bolt. < Refer to VDC CONTROL MODULE & HYDRAULIC CONTROL UNIT (VDCCM&H/U) , COMPONENT, General Description. >
2 CHECK STEERING WHEEL. Drive the vehicle on a flat road. Park the vehicle straight. Check the steering wheel for deviation from center.Is the deviation from the center of steering wheel less than 5°?Go to step 3 .Perform the centering adjustment of steering wheel, and perform the VDC sensor midpoint setting mode. Go to step 3 . < Refer to VDC SENSOR MIDPOINT SETTING MODE , ADJUSTMENT, VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >
3 CHECK OUTPUT OF STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR. Adjust steering wheel to the center position. Connect Subaru Select Monitor, and select "Current Data Display & Save". Read the «Steer Angle Sensor Op» displayed on display.Is the indicated reading of the «Steer Angle Sensor Op» on the monitor display -10° - 10°?Go to step 4 .Check the installation of the steering wheel and steering angle sensor, and replace the parts if necessary.
4 CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR. Drive the vehicle on a flat road. Park the vehicle straight. Connect Subaru Select Monitor, and select "Current Data Display & Save". Read output of sensors displayed on display.Are the indicated reading of sensor outputs following values? Lateral G sensor Output: -2 - 2 m/s 2 Fr Rr G sensor Output: -2 - 2 m/s 2 Yaw Rate Sensor Output: -4 - 4 deg/sGo to step 5 .Recheck from step 1, and if the problem is not solved, go to next. Go to step 8 .
5 SET 0 POINT FOR LONGITUDINAL G SENSOR USING SUBARU SELECT MONITOR. Select "Work Support" on Subaru Select Monitor. Perform the VDC sensor midpoint setting mode. < Refer to VDC SENSOR MIDPOINT SETTING MODE , ADJUSTMENT, VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Is the 0 point setting successful?Go to step 6 .Recheck from step 1, and when the 0 point setting is not possible, replace the VDCCM and the steering angle sensor. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). > < Refer to VDC-27, Steering Angle Sensor. >
6 PERFORM DRIVING TEST. Drive approximately 10 minutes, and check if the warning lights illuminate or improperly operate during driving.Did the ABS warning light or VDC warning light remain off? Does ABS or VDC operate without malfunction?Go to step 7 .Recheck from step 1, and when the warning lights illuminate or improperly operate, replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >
7 CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR. Park the vehicle on a level surface. Connect Subaru Select Monitor, and select "Current Data Display & Save". Read output of sensors displayed on display.Are the indicated reading of sensor outputs following values? Lateral G sensor Output: -2 - 2 m/s 2 Fr Rr G sensor Output: -2 - 2 m/s 2 Yaw Rate Sensor Output: -4 - 4 deg/sIt results from a temporary noise interference.Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >
8 CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR. Remove the VDCCM&H/U installation bolt and bracket. Keep VDCCM&H/U in a horizontal position. Connect Subaru Select Monitor, and select "Current Data Display & Save". Read output of sensors displayed on display.When VDCCM&H/U is in a horizontal position, are the indicated reading of sensor outputs following values? Lateral G sensor Output: -1.5 - 1.5 m/s 2 Fr Rr G sensor Output: -1.5 - 1.5 m/s 2 Yaw Rate Sensor Output: -4 - 4 deg/sCheck the bracket and brake pipe, and install VDCCM&H/U in a horizontal position to the vehicle.Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >

DIAGNOSTIC PROCEDURE

SymptomsMain probable causeOther probable cause
Poor brake performanceLong braking/stopping distanceVDCCM&H/U Brake pad Aeration to brake line Tire specifications, tire wear and air pressures Incorrect wiring or piping connectionsDefective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Master cylinder Brake caliper Disc rotor Brake pipe Brake booster
Wheel lockVDCCM&H/U Defective ABS wheel speed sensor or sensor gap Incorrect wiring or piping connectionsDefective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Brake caliper Brake pipe
Brake dragVDCCM&H/U Defective ABS wheel speed sensor or sensor gap Master cylinder Brake caliper Parking brake Axle and wheels Brake pedal playDefective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Brake pad Brake pipe
Long brake pedal strokeAeration to brake line Brake pedal playVDCCM&H/U Master cylinder Brake caliper Brake pad Brake pipe Brake booster
Vehicle vertical pitchingVDCCM&H/U Road surface (uneven) Suspension play or fatigue (reduced damping) Incorrect wiring or piping connectionsDefective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U.
Poor brake performanceUnstable or uneven brakingVDCCM&H/U Defective ABS wheel speed sensor or sensor gap Brake caliper Brake pad Road surface (uneven) Tire specifications, tire wear and air pressures Incorrect wiring or piping connectionsDefective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Master cylinder Disc rotor Brake pipe Axle and wheels Road with crowns or banks Suspension play or fatigue (reduced damping)
Vibration or noise When braking suddenly When accelerating suddenly While driving on a slippery roadExcessive brake pedal vibrationRoad surface (uneven) Incorrect wiring or piping connectionsVDCCM&H/U Brake booster Suspension play or fatigue (reduced damping)
Noise from VDCH/UVDCCM&H/U (mount bushing) Defective ABS wheel speed sensor or sensor gap Brake pipeVDCCM&H/U Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U.
Noise from the front side of vehicleVDCCM&H/U (mount bushing) Defective ABS wheel speed sensor or sensor gap Master cylinder Brake caliper Brake pad Disc rotor Brake pipe Brake booster Suspension play or fatigue (reduced damping)Axle and wheels Tire specifications, tire wear and air pressures
Noise from the rear side of vehicleDefective ABS wheel speed sensor or sensor gap Brake caliper Brake pad Disc rotor Parking brake Brake pipe Suspension play or fatigue (reduced damping)Axle and wheels Tire specifications, tire wear and air pressures
Engine does not accelerate or goes into a stall when accelerating suddenly or driving on a slippery surface.VDCCM&H/U Defective ABS wheel speed sensor or sensor gap Master cylinder Brake caliper Parking brake Incorrect wiring or pipingDefective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Brake pad Brake pipe
Poor change-direction-operation stability of TCSDeviation to right or left directionVDCCM&H/U Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Brake caliper Brake pad Wheel alignment Road surface (uneven) Road with crowns or banks Tire specifications, tire wear and air pressures Incorrect wiring or piping connectionsDisc rotor Brake pipe Axle and wheels Suspension play or fatigue (reduced damping)
Vehicle spinVDCCM&H/U Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Brake pad Tire specifications, tire wear and air pressures Incorrect wiring or piping connectionsBrake caliper Brake pipe
Steering wheel drag while drivingVDCCM&H/U Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Incorrect wiring or piping connections Power steering systemBrake caliper Brake pad Disc rotor Wheel alignment Road surface (uneven) Road with crowns or banks Suspension play or fatigue (reduced damping) Tire specifications, tire wear and air pressures
VDC operates while driving normally.VDCCM&H/U Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Wheel alignment Road surface (uneven) Road with crowns or banks Suspension play or fatigue (reduced damping) Tire specifications, tire wear and air pressures Incorrect wiring or piping connections Power steering system
VDC OFF indicator light does not illuminate when the VDC OFF switch is depressed. NOTE: When pressing VDC OFF switch for 10 seconds or more, VDC OFF indicator light goes off and cannot operate any more. When turning the ignition switch from OFF to ON, the previous status is restored.Harness Combination meter VDC OFF switch
NOTE
When pressing VDC OFF switch for 10 seconds or more, VDC OFF indicator light goes off and cannot operate any more. When turning the ignition switch from OFF to ON, the previous status is restored.

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