General Information

Component Location





General Description

Alternator output and power demand of all electrical loads and systems must be matched to each other as ideally as possible so that the entire system is reliable and trouble-free in operation. The PCM monitors alternator output deviation from the signal of the FR terminal of the alternator when the engine is running.

DTC Description

PCM sets DTC P0626 if the PCM detects output duty signal higher than the possible range of a properly operating alternator.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data




1 Normal waveform with IG ON
2 Normal waveform with Idle and no electrical load
3 Normal waveform with Idle and part electrical load
4 Normal waveform with Idle and full electrical load (A/C, Defrost, Head Lamp, Repeater, Audio, etc)