DTC Troubleshooting: 71-04
DTC 71-04:
 EPS Motor Angle Sensor (Check Signal) (Regular 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 71-04 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 EPS control unit connector D (28P) terminal No. 13 and No. 27.
Is the resistance between 5−50 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. 13 terminal and No. 27 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. 2 terminal, No. 5 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 EPS control unit.■
  1. Disconnect the EPS motor angle sensor 6P connector.
  1. On the sensor side, check for resistance between EPS motor angle sensor 6P connector terminals No. 2 and No. 5.
Is the resistance between 5−50 Ω?
YES -
Open, or short to body ground in the wire between the EPS motor angle sensor 6P connector and 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. ■