Self-diagnosis Self-diagnosis can be classified into two 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. The EPS control unit performs the following functions when a problem is detected by self-diagnosis: Turns on the EPS indicator. Memorizes the DTC. Stops power assist and manual steering operation resumes. NOTE: When DTC 23 (a problem with the circuit for engine speed signal) is detected, the power assist will return to normal when the vehicle speed is 10 km/h (6 mph) or above. For DTCs 21, 22 and 23 the EPS indicator will go off automatically, and the system returns to normal. |