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

DTC 52 MOTOR AND MOTOR RELAY ON FAILURE

DTC DETECTING CONDITION:

Defective valve relay

NOTE:

When the DTC 74 check is executed, DTC 51 is stored, but this does not indicate an error in the valve relay.

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

WIRING DIAGRAM:

• LHD model

• RHD model

STEPCHECKYESNO

1.CHECK CONTACT POINT OF VALVE RELAY.

1) Turn the ignition switch to OFF.

2) Remove the valve relay from the relay box.

3) Connect the battery to the valve relay terminals No. 85 and No. 86.

4) Measure the resistance between valve relay terminals.

Terminals

No. 30 — No. 87:

Is the resistance less than 0.5 Ω?

Replace the valve relay.

2.CHECK CONTACT POINT OF VALVE RELAY.

Measure the resistance between valve relay terminals.

Terminals

No. 30 — No. 87a:

Is the resistance 1 MΩ or more?

Replace the valve relay.

3.CHECK CONTACT POINT OF VALVE RELAY.

1) Disconnect the battery from the valve relay terminals.

2) Measure the resistance between valve relay terminals.

Terminals

No. 30 — No. 87:

Is the resistance 1 MΩ or more?

Replace the valve relay.

4.CHECK CONTACT POINT OF VALVE RELAY.

Measure the resistance between valve relay terminals.

Terminals

No. 30 — No. 87a:

Is the resistance less than 0.5 Ω?

Replace the valve relay.

5.CHECK VALVE RELAY SHORT.

Measure the resistance between valve relay terminals.

Terminals

No. 86 — No. 87:

No. 86 — No. 87a:

Is the resistance 1 MΩ or more?

Replace the valve relay.

6.CHECK BATTERY SHORT CIRCUIT IN THE RELAY BOX CONTACT POINT CIRCUIT.

1) Disconnect the connectors (B370) (LHD model) and (F90) (RHD model) from relay box.

2) Measure the voltage between the relay box connector and chassis ground.

Connector & terminal

(VDC4) No. 5 (+) — Chassis ground (−):

(VDC4) No. 1 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Replace the relay box. Check fuse No. 8 and SBF3.

7.CHECK BATTERY SHORT CIRCUIT IN THE RELAY BOX CONTACT POINT CIRCUIT.

1) Turn the ignition switch to ON.

2) Measure the voltage between VDCH/U connector and chassis ground.

Connector & terminal

(VDC4) No. 5 (+) — Chassis ground (−):

(VDC4) No. 1 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Replace the relay box. Check fuse No. 8 and SBF3.

8.CHECK BATTERY SHORT OF THE VALVE RELAY CONTROL SYSTEM HARNESS.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from VDCCM.

3) Disconnect the connector from VDCH/U.

4) Measure the voltage between VDCCM connector and chassis ground.

Connector & terminal

(B310) No. 27 (+) — Chassis ground (−):

(B310) No. 48 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Repair the harness between VDCCM and relay box and check all of the fuses.

9.CHECK BATTERY SHORT OF THE VALVE RELAY CONTROL SYSTEM HARNESS.

1) Turn the ignition switch to ON.

2) Measure the voltage between VDCCM connector and chassis ground.

Connector & terminal

(B310) No. 27 (+) — Chassis ground (−):

(B310) No. 48 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Repair the harness between VDCCM and relay box and check all of the fuses.

10.CHECK BATTERY SHORT CIRCUIT IN THE RELAY BOX CONTACT POINT CIRCUIT.

1) Disconnect the (VDC1) connector from the relay box.

2) Measure the voltage between VDCH/U connector and chassis ground.

Connector & terminal

(VDC1) No. 2 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Replace the relay box.

11.CHECK BATTERY SHORT CIRCUIT IN THE RELAY BOX CONTACT POINT CIRCUIT.

1) Turn the ignition switch to ON.

2) Measure the voltage between VDCH/U connector and chassis ground.

Connector & terminal

(VDC1) No. 2 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Replace the relay box.

12.CHECK SOLENOID VALVE BATTERY SHORT.

1) Turn the ignition switch to OFF.

2) Measure the voltage between VDCH/U connector and chassis ground.

Connector & terminal

(VDC2) No. 2 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Replace the VDCH/U and check all of the fuses.

13.CHECK SOLENOID VALVE BATTERY SHORT.

1) Turn the ignition switch to ON.

2) Measure the voltage between VDCH/U connector and chassis ground.

Connector & terminal

(VDC2) No. 2 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Replace the VDCH/U and check all of the fuses.

14.CHECK BATTERY SHORT OF HARNESS.

1) Turn the ignition switch to OFF.

2) Measure the voltage between VDCCM connector and chassis ground.

Connector & terminal

(B310) No. 3 (+) — Chassis ground (−):

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

(B310) No. 23 (+) — Chassis ground (−):

(B310) No. 31 (+) — Chassis ground (−):

(B310) No. 35 (+) — Chassis ground (−):

(B310) No. 34 (+) — Chassis ground (−):

(B310) No. 29 (+) — Chassis ground (−):

(B310) No. 26 (+) — Chassis ground (−):

(B310) No. 25 (+) — Chassis ground (−):

(B310) No. 4 (+) — Chassis ground (−):

(B310) No. 30 (+) — Chassis ground (−):

(B310) No. 32 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Repair the harness between VDCH/U and VDCCM and check all of the fuses.

15.CHECK BATTERY SHORT OF HARNESS.

1) Turn the ignition switch to ON.

2) Measure the voltage between VDCCM connector and chassis ground.

Connector & terminal

(B310) No. 3 (+) — Chassis ground (−):

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

(B310) No. 23 (+) — Chassis ground (−):

(B310) No. 31 (+) — Chassis ground (−):

(B310) No. 35 (+) — Chassis ground (−):

(B310) No. 34 (+) — Chassis ground (−):

(B310) No. 29 (+) — Chassis ground (−):

(B310) No. 26 (+) — Chassis ground (−):

(B310) No. 25 (+) — Chassis ground (−):

(B310) No. 4 (+) — Chassis ground (−):

(B310) No. 30 (+) — Chassis ground (−):

(B310) No. 32 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Repair the harness between VDCH/U and VDCCM and check all of the fuses.

16.CHECK POOR CONTACT OF CONNECTOR.

Turn the ignition switch to OFF.

Is there poor contact in connector between the VDCCM and VDCH/U?

Repair the connector.

17.CHECK VDCCM.

1) Connect all connectors.

2) Erase the memory.

3) Perform the Inspection Mode.

4) Read the DTC.

In the current diagnosis, is the same DTC displayed again?

Replace the VDCCM.

18.CHECK ANY OTHER DTC ON DISPLAY.

Are other DTCs displayed?

Go to the diagnosis corresponding to the DTC.

Temporary poor contact occurs.