EPS DTC Troubleshooting: 71-01, 71-02, 71-03, 71-05, 71-06
DTC 71-01:
 Motor-Angle Sensor (SIN/COS Signals) (Steering diagnosis)
DTC 71-02:
 Motor-Angle Sensor (Neutral Position Learning of SIN/COS) (Initial diagnosis)
DTC 71-03:
 Motor-Angle Sensor (SIN/COS Signals) (Steering diagnosis)
DTC 71-05:
 Motor-Angle Sensor (SIN/COS Signals changing amount) (Steering diagnosis)
DTC 71-06:
 Motor-Angle Sensor (SIN/COS Signals Initial) (Initial diagnosis)
  1. Turn the ignition switch OFF.
  1. Start the engine.
  1. Turn the steering wheel to the right or left, and wait 10 seconds or more.
Does the EPS indicator come on?
YES -
Go to Step 5 .
NO -
Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.■
  1. Verify the DTC.
Is DTC 71-01, 71-02, 71-03, 71-05 or 71-06 indicated?
YES -
Go to Step 6 .
NO -
Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time.■
  1. Turn the ignition switch OFF.
  1. Disconnect EPS control unit connector D (28P).
  1. Check for resistance between the following terminals of EPS control unit connector D (28P).
Is the resistance between R1−R2 13−25 Ω, S1−S3 26−49 Ω, and S2−S4 26−49 Ω?
YES -
Go to Step 9 .
NO -
Go to Step 12 .
  1. Check for continuity between body ground and the EPS control unit connector D (28P) No. 12 terminal, No. 13 terminal, No. 14 terminal, No. 26 terminal, No. 27 terminal, and No. 28 terminal individually.
Is the continuity?
YES -
Go to Step 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. ■
  1. Disconnect the motor-angle sensor 6P connector.
  1. Check for continuity between body ground and motor-angle sensor 6P connector No. 1 terminal, No. 2 terminal, No. 3 terminal, No. 4 terminal, No. 5 terminal, and No. 6 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. ■
NO -
Repair short to body ground in the wire harness between the motor-angle sensor 6P connector and the EPS control unit.■
  1. Disconnect the motor-angle sensor 6P connector.
  1. Check for resistance between the following terminals of the motor-angle sensor 6P connector.
Is the resistance between R1−R2 13−25 Ω, S1−S3 26−49 Ω, and S2−S4 26−49 Ω?
YES -
Open or short to body ground in the wire harness between the motor-angle sensor 6P connector and the EPS control unit.■
NO -
Faulty motor-angle sensor (internal failure), or short to body ground in the wire (sensor side), replace the motor. ■