General Information

Engine Control
P0625 Generator Field/ F Terminal Circuit Low - General Information

Component Location





General Description

Alternator in which there is a communication regulator in order to compensate current loss resulting from repetitive starting.
The alternator is duty controlled as current control by ECM with the battery voltage, current, temperature information from battery sensor.
The more electrical load, the higher duty output.

DTC Description

If the alternator's output duty signal is over 50% under IG ON (Engine speed is below 20rpm.), ECM sets P0625.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data








Fig.1) Idle Status
Fig.2) Electrical Load (Head Lamp and Defrost are ON
Duty(+) from FR terminal is increased if electrical loads are ON(Head Lamp and Defrost are ON) ECM controls generation of alternator with duty from FR terminal when electrical Loads turn on