C1601

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

If "DTC CONFIRMATION PROCEDURE" has been previously conducted, always turn power switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.

2. DTC REPRODUCTION PROCEDURE

With CONSULT
1.Turn the power switch OFF to ON.
2.Perform "EPS" self-diagnosis.
Is DTC "C1601" detected?
YES- Proceed to diagnosis procedure. Refer to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK EPS CONTROL UNIT GROUND CIRCUIT

1.Turn power 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 power switch ON.

CAUTION:
Never set the vehicle to READY.
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 power 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 power switch ON power supply. Refer to "Wiring Diagram ON POWER SUPPLY -" On Power Supply.
NO- Repair or replace error-detected parts.

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

1.Turn power switch OFF.
2.Check voltage between EPS control unit harness connector terminals and ground.





3.Turn power switch ON.

CAUTION:
Never set the vehicle to READY.
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 power switch OFF.
2.Check the 60A fusible link (N).
3.Check the harness for open or short between EPS control unit harness connector No.9 terminal and the
60A fusible link (N).
Is the inspection result normal?
YES- Perform the trouble diagnosis for 12V battery power supply. Refer to "Wiring Diagram BATTERY POWER SUPPLY -" Battery Power Supply.
NO- Repair or replace error-detected parts.

6. CHECK TERMINALS AND HARNESS CONNECTORS

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 "Removal and Installation" With Heated Steering Wheel.
NO- Repair or replace error-detected parts.