How to Troubleshoot the EPS
Self-diagnosis
Self-diagnosis can be classified into three categories:
  • Initial diagnosis: Performed right after the engine starts and until the EPS indicator goes off.
  • Regular diagnosis: Performed right after the initial diagnosis until the ignition switch is turned OFF.
  • Steering diagnosis: Performed during regular diagnosis while turning steering wheel.
The EPS control unit performs the following functions when a problem is detected by self-diagnosis:
  1. Turns on the EPS indicator.
  1. Memorizes the DTC.
  1. Stops power assist and manual steering operation resumes.
    NOTE: For DTCs 11-01, 11-02, 12-01, 21-01, 21-02, 22-01 and 35-04 the EPS indicator will go off automatically, and the system returns to normal.