VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC DETECTING CONDITION:

• Defective ABS wheel speed sensor (broken wire, input voltage too high)

• Defective harness connector

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

WIRING DIAGRAM:

• LHD model

• RHD model

STEP	CHECK	YES	NO
1.CHECK OUTPUT OF ABS WHEEL SPEED SENSOR USING SUBARU SELECT MONITOR. 1) Select {Current Data Display & Save} in Subaru Select Monitor. 2) Read the ABS wheel speed sensor output corresponding to the faulty area in the Subaru Select Monitor data display mode.	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?
2.CHECK INSTALLATION OF ABS WHEEL SPEED SENSOR.	Is the ABS wheel speed sensor installation bolt tightened to 33±10 N·m (3.4±1.0 kgf-m, 24.6±7.2 ft-lb)?		Tighten the ABS wheel speed sensor installation bolts.
3.CHECK CLEARANCE OF ABS WHEEL SPEED SENSOR. Measure the clearance between the tone wheel and protrusion around the entire area around the wheel.	Is the clearance within the following? Front wheel: 0.3 — 0.8 mm (0.012 — 0.031 in); Rear wheel: 0.7 — 1.2 mm (0.0276 — 0.0472 in)		Adjust the clearance. NOTE: Adjust the gap using spacers (Part No. 26755AA000). If spacers cannot correct the gap, replace the worn sensor or worn tone wheel.
4.CHECK TONE WHEEL RUNOUT. Measure the tone wheel runout.	Is the runout less than 0.05 mm (0.0020 in)?		Repair the tone wheel. Front: Rear:
5.CHECK POOR CONTACT OF CONNECTOR. Turn the ignition switch to OFF.	Is there poor contact in connectors between VDCCM and ABS wheel speed sensor?	Repair the connector.
6.CHECK VDCCM. 1) Connect all connectors. 2) Erase the memory. 3) Perform the Inspection Mode. 4) Read the DTC.	Is the same DTC displayed again?	Replace the VDCCM.
7.CHECK ANY OTHER DTC ON DISPLAY.	Are other DTCs displayed?	Go to the diagnosis corresponding to the DTC.	Temporary poor contact occurs. NOTE: Check the harness and connector between VDCCM and ABS wheel speed sensor.
8.CHECK ABS WHEEL SPEED SENSOR. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from the ABS wheel speed sensor. 3) Measure the resistance between ABS wheel speed sensor connector terminals. Terminals Front RH No. 1 — No. 2: Front LH No. 1 — No. 2: Rear RH No. 1 — No. 2: Rear LH No. 1 — No. 2:	Is the resistance as shown below? Front: 1.0 — 1.5 kΩ, Rear: 1.025 — 1.265 kΩ		Replace the ABS wheel speed sensor. Front: Rear:
9.CHECK BATTERY SHORT OF ABS WHEEL SPEED SENSOR. 1) Disconnect the connectors from VDCCM. 2) Measure the voltage between ABS wheel speed sensor and chassis ground. Terminals Front RH No. 1 (+) — Chassis ground (−): Front LH No. 1 (+) — Chassis ground (−): Rear RH No. 1 (+) — Chassis ground (−): Rear LH No. 1 (+) — Chassis ground (−):	Is the voltage less than 1 V?		Replace the ABS wheel speed sensor. Front: Rear:
10.CHECK BATTERY SHORT OF ABS WHEEL SPEED SENSOR. 1) Turn the ignition switch to ON. 2) Measure the voltage between ABS wheel speed sensor and chassis ground. Terminals Front RH No. 1 (+) — Chassis ground (−): Front LH No. 1 (+) — Chassis ground (−): Rear RH No. 1 (+) — Chassis ground (−): Rear LH No. 1 (+) — Chassis ground (−):	Is the voltage less than 1 V?		Replace the ABS wheel speed sensor. Front: Rear:
11.CHECK HARNESS CONNECTOR BETWEEN VDCCM AND ABS WHEEL SPEED SENSOR. 1) Turn the ignition switch to OFF. 2) Connect the connector to the ABS wheel speed sensor. 3) Measure the resistance between VDCCM connectors. Connector & terminal DTC 21 (B310) No. 14 — No. 13: DTC 23 (B310) No. 21 — No. 19: DTC 25 (B310) No. 18 — No. 17: DTC 27 (B310) No. 16 — No. 15:	Is the resistance as shown below? Front: 1.0 — 1.5 kΩ, Rear: 1.025 — 1.265 kΩ		Repair the harness connector between VDCCM and ABS wheel speed sensor.
12.CHECK BATTERY SHORT OF HARNESS. Measure the voltage between VDCCM connector and chassis ground. Connector & terminal DTC 21 (B310) No. 14 (+) — Chassis ground (−): DTC 23 (B310) No. 21 (+) — Chassis ground (−): DTC 25 (B310) No. 18 (+) — Chassis ground (−): DTC 27 (B310) No. 16 (+) — Chassis ground (−):	Is the voltage less than 1 V?		Repair the harness between VDCCM and ABS wheel speed sensor.
13.CHECK BATTERY SHORT OF HARNESS. 1) Turn the ignition switch to ON. 2) Measure the voltage between VDCCM connector and chassis ground. Connector & terminal DTC 21 (B310) No. 14 (+) — Chassis ground (−): DTC 23 (B310) No. 21 (+) — Chassis ground (−): DTC 25 (B310) No. 18 (+) — Chassis ground (−): DTC 27 (B310) No. 16 (+) — Chassis ground (−):	Is the voltage less than 1 V?		Repair the harness between VDCCM and ABS wheel speed sensor.
14.CHECK INSTALLATION OF ABS WHEEL SPEED SENSOR.	Is the ABS wheel speed sensor installation bolt tightened to 33±10 N·m (3.4±1.0 kgf-m, 24.6±7.2 ft-lb)?		Tighten the ABS wheel speed sensor installation bolts.
15.CHECK ABS WHEEL SPEED SENSOR CLEARANCE. Measure the clearance between the tone wheel and protrusion around the entire area around the wheel.	Is the clearance within the following? Front wheel: 0.3 — 0.8 mm (0.012 — 0.031 in); Rear wheel: 0.7 — 1.2 mm (0.0276 — 0.0472 in)		Adjust the clearance. NOTE: Adjust the gap using spacers (Part No. 26755AA000). If spacers cannot correct the gap, replace the worn sensor or worn tone wheel.
16.CHECK FOR RUNOUT OF THE HUB AND TONE WHEEL. Measure the runout of the hub and tone wheel.	Is the runout less than 0.05 mm (0.0020 in)?		Repair the hub and tone wheel. Front: Rear:
17.CHECK POOR CONTACT OF CONNECTOR.	Is there poor contact in connectors between VDCCM and ABS wheel speed sensor?		Repair the connector.
18.CHECK THE VDCCM. 1) Connect all connectors. 2) Erase the memory. 3) Perform the Inspection Mode. 4) Read the DTC.	Is the same DTC displayed?	Replace the VDCCM.
19.CHECK ANY OTHER DTC ON DISPLAY.	Are other DTCs displayed?	Go to the diagnosis corresponding to the DTC.	Temporary poor contact occurs. NOTE: Check the harness and connector between VDCCM and ABS wheel speed sensor.