DTC Troubleshooting: 71-04

DTC 71-04:  Motor-Angle Sensor (RSH Signals) (Diagnosis when steering wheel turning)

1.Clear the DTC using the HDS.

2.Turn the ignition switch OFF.

3.Start the engine.

4.Turn the steering wheel to right or left, and wait 10 seconds or more.

Does the EPS indicator come on?


YES - Go to 5.


NO - Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.n


5.Verify the DTC.

Is DTC 71-04 indicated?


YES - Go to 6.


NO - Perform the appropriate troubleshooting for the code indicated.n


6.Turn the ignition switch OFF.

7.Disconnect the EPS control unit connector D (28P).

8.Check for resistance between the EPS control unit connector D (28P) terminal No. 13 and No. 27.

 

Is the resistance between 13-25 W?


YES - Go to 9.


NO - Go to 12.

9.Check for continuity between body ground and the EPS control unit connector D (28P) No. 13 terminal, No. 27 terminal individually.

 

Is there continuity?


YES - Go to 10.


NO - Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit.n

10.Disconnect the motor-angle sensor 6P connector.

11.Check for continuity between body ground and motor-angle sensor 6P connector No. 2 terminal, No. 5 terminal individually.

 

Is there continuity?


YES - Faulty motor-angle sensor (internal failure), or short to body ground in the wire (sensor side), replace the motor: LHD type, RHD type.n


NO - Repair short to body ground in the wire harness between the motor-angle sensor 6P connector and EPS control unit.n

12.Disconnect the motor-angle sensor 6P connector.

13.Check for resistance between the motor-angle sensor 6P connector terminals No. 2 and No. 5.

 

Is the resistance between 13-25 ?


YES - Open, or short to body ground in the wire harness between the motor-angle sensor 6P connector and EPS control unit.n


NO - Faulty motor-angle sensor (internal failure), or short to body ground in the wire (sensor side), replace the motor: LHD type, RHD type.n