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

DTC C0051 VALVE RELAY

DTC DETECTING CONDITION:

Defective valve relay

TROUBLE SYMPTOM:

• ABS does not operate.

• EBD does not operate.

• VDC does not operate.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK VDCCM&H/U INPUT VOLTAGE.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the VDCCM&H/U.

3) Run the engine at idle.

4) Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 28 (+) — Chassis ground (−):

(B310) No. 24 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

Repair the power supply circuit.

2.CHECK VDCCM&H/U INPUT VOLTAGE.

Calculate the voltage difference measured in step 1.

A: (B310) No. 28 (+) — Chassis ground (−):

B: (B310) No. 24 (+) — Chassis ground (−):

Is the voltage difference between A and B 2 V or more?

Repair the power supply circuit.

3.CHECK VDCCM&H/U GROUND CIRCUIT.

1) Turn the ignition switch to OFF.

2) Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 25 — Chassis ground:

Is the resistance less than 0.5 Ω?

Repair the VDCCM&H/U ground harness.

4.CHECK VDCCM&H/U VALVE RELAY.

Measure the resistance between VDCCM&H/U connector terminals.

Connector & terminal

(B310) No. 24 — (B310) No. 25:

Is the resistance 1 MΩ or more?

Replace the VDCCM only.

5.CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of connector between generator, battery and VDCCM&H/U?

Repair the connector.

6.CHECK VDCCM&H/U.

1) Connect all connectors.

2) Clear the memory.

3) Perform the Inspection Mode.

4) Read the DTC.

Is the same DTC displayed?

Replace the VDCCM only.

7.CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diagnosis according to DTC.

Temporary poor contact occurs.