DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.DTC REPRODUCTION PROCEDURE

With CONSULT-III

1. Turn the ignition switch OFF to ON.

2. Perform “EPS” self-diagnosis.

Is DTC “C1601” detected? YES >> Proceed to diagnosis procedure. Refer to STC-19, "Diagnosis Procedure".

NO >> INSPECTION EN

Diagnosis Procedure

1.CHECK EPS CONTROL UNIT GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect EPS control unit harness connector.

3. Check continuity between EPS control unit harness connector terminal and ground.

4. Connect EPS control unit harness connector.

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

2.CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (1)

1. Check voltage between EPS control unit harness connector terminals and ground.

2. Turn ignition switch ON.

CAUTION:
Never start the engine

.

3. Check voltage between EPS control unit harness connector and ground.

Is the inspection result normal? YES >> GO TO 4.

NO >> GO TO 3.

3.CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (2)

1. Turn ignition switch OFF.

2. Check the 10A fuse (#3).

3. Check the harness for open or short between EPS control unit harness connector No.4 terminal and the 10A fuse (#3).

Is the inspection result normal? YES >> Perform the trouble diagnosis for ignition power supply circuit. Refer to PG-15, "Wiring Diagram - IGNITION POWER SUPPLY -".

NO >> Repair or replace error-detected parts.

4.CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (3)

1. Turn ignition switch OFF.

2. Check voltage between EPS control unit harness connector terminals and ground.

3. Turn ignition switch ON.

CAUTION:
Never start the engine.

4. Check voltage between EPS control unit harness connector and ground.

Is the inspection result normal? YES >> GO TO 6.

NO >> GO TO 5.

5.CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (4)

1. Turn ignition switch OFF.

2. Check the 60A fusible link (M).

3. Check the harness for open or short between EPS control unit harness connector No.9 terminal and the 60A fusible link (M).

Is the inspection result normal? YES >> Perform the trouble diagnosis for power supply circuit. Refer to PG-10, "Wiring Diagram - BATTERY POWER SUPPLY -".

NO >> Repair or replace error-detected parts.

6.CHECK TERMINALS AND HARNESS CONECTORS

Check the EPS control unit pin terminals for damage or loose connection with harness connector.

Is the inspection result normal? YES >> EPS control unit is malfunctioning. Replace steering column assembly. Refer to ST-10, "Removal and Installation".

NO >> Repair or replace error-detected parts.