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.
During engine running, if alternator's output duty signal is above 20%, ECM sets P0626.
Item
Detecting Condition
Possible Cause
DTC Strategy
Input signal check
Open or Short to Power in harness
Faulty charging system
Enable Conditions
Engine speed > 520rpm
Target alternator duty > 30%
Threshold Value
Alternator duty < 20%
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