1. Alternator
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.
If the alternator's output duty signal is over 50% under IG ON (Engine speed is below 20rpm.), ECM sets P0625.
Item
Detecting Condition
Possible Cause
DTC Strategy
Input signal check
Short to Ground in harness
Poor connection or damaged harness
Enable Conditions
Engine speed < 20rpm
Threshold Value
Alternator duty > 50%
Diagnostic Time
-
MIL ON Condition
NO MIL
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