DTC Troubleshooting: 71-01, 71-02, 71-03
DTC 71-01:
 EPS Motor Angle Sensor (SIN/COS Signals) (Steering Diagnosis)
DTC 71-02:
 EPS Motor Angle Sensor (Neutral Position Learning of SIN/COS) (Initial Diagnosis)
DTC 71-03:
 EPS Motor Angle Sensor (SIN/COS Signals) (Steering Diagnosis)
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Turn the ignition switch to LOCK (0).
  1. Start the engine.
  1. Turn the steering wheel to right or left, and wait 10 seconds or more.
  1. Check for DTCs with the HDS.
Is DTC 71-01, 71-02, or 71-03 indicated?
YES -
Go to Step 7 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EPS control unit.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the EPS control unit connector D (28P).
  1. Measure the resistance between following terminals of the EPS control unit connector D (28P).
Is the resistance between R1-R2 5−50 Ω, S1-S3 10−100 Ω, and S2-S4 10−100 Ω?
YES -
Go to Step 10 .
NO -
Go to Step 13 .
  1. Check for continuity between body ground and EPS control unit connector D (28P) No. 12 terminal, No. 13 terminal, No. 14 terminal, No. 26 terminal, No. 27 terminal, No. 28 terminal individually.
Is there continuity?
YES -
Go to Step 11 .
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 EPS motor angle sensor 6P connector.
  1. On the sensor side, check for continuity between body ground and EPS motor angle sensor 6P connector No. 1 terminal, No. 2 terminal, No. 3 terminal, No. 4 terminal, No. 5 terminal, No. 6 terminal individually.
Is there continuity?
YES -
Faulty EPS motor angle sensor (internal failure), or short to body ground in the wire (sensor side), replace the steering gearbox. ■
NO -
Repair short to body ground in the wire between the EPS motor angle sensor 6P connector and the EPS control unit.■
  1. Disconnect the EPS motor angle sensor 6P connector.
  1. On the sensor side, measure the resistance between following terminals of EPS motor angle sensor 6P connector.
Is the resistance between R1-R2 5−50 Ω, S1-S3 10−100 Ω, and S2-S4 10−100 Ω?
YES -
Open, or short to body ground in the wire between the EPS motor angle sensor 6P connector and the EPS control unit.■
NO -
Faulty EPS motor angle sensor (internal failure), or short to body ground in the wire (sensor side), replace the steering gearbox. ■