ABS (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC 52 MOTER/MOTER RELAY MALFUNCTION

DTC DETECTING CONDITION:

• Defective motor

• Defective motor relay

• Defective harness connector

TROUBLE SYMPTOM:

ABS does not operate.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK FOR LOOSENED GROUND BOLT.

Check for looseness in the ABSCM&H/U motor ground bolt.

Is ground bolt tightened to 13 N·m (1.3 kgf-m, 9.4 ft-lb) torque?

Tighten the ground bolt.

2.CHECK INPUT VOLTAGE OF ABSCM&H/U.

1) Turn the ignition switch to OFF.

2) Disconnect the ABSCM&H/U connectors.

3) Turn the ignition switch to ON.

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

Connector & terminal

LHD model

(B301) No. 13 (+) — Chassis ground (−):

RHD model

(F49) No. 13 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

Repair the harness connector between battery and ABSCM&H/U.

3.CHECK GROUND CIRCUIT OF MOTOR.

1) Turn the ignition switch to OFF.

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

Connector & terminal

LHD model

(B301) No. 12 — Chassis ground:

RHD model

(F49) No. 12 — Chassis ground:

Is the resistance less than 0.5 Ω?

Repair the ABSCM&H/U ground harness.

4.CHECK INPUT VOLTAGE OF ABSCM&H/U.

1) Run the engine at idle.

2) Measure the voltage between ABSCM&H/U connector and chassis ground.

Connector & terminal

LHD model

(B301) No. 18 (+) — Chassis ground (−):

RHD model

(F49) No. 18 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

Repair the harness connector between battery, ignition switch and ABSCM&H/U.

5.CHECK THE ABSCM&H/U GROUND CIRCUIT.

1) Turn the ignition switch to OFF.

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

Connector & terminal

LHD model

(B301) No. 15 — Chassis ground:

RHD model

(F49) No. 15 — Chassis ground:

Is the resistance less than 0.5 Ω?

Repair the ABSCM&H/U ground harness.

6.CHECK POOR CONTACT IN CONNECTOR.

Turn the ignition switch to OFF.

Is there poor contact in connector between generator, battery and ABSCM&H/U?

Repair the connector.

7.CHECK ABSCM&H/U.

1) Connect all connectors.

2) Erase the memory.

3) Perform the Inspection Mode.

4) Read the DTC.

Is the same DTC displayed?

Replace the ABSCM&H/U.

8.CHECK ANY OTHER DTC ON DISPLAY.

Is there any other DTC displayed?

Check DTC using “List of Diagnostic Trouble Code (DTC)”.

Temporary poor contact occurs.

NOTE:

Though the ABS warning light remains on at this time, this is normal. Drive the vehicle at more than 12 km/h (7 MPH) in order to turn ABS warning light off. Be sure to drive the vehicle and check that the warning light goes off.