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/PCM 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/PCM sets P0626.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Input signal check | 1. Open or Short to Power in harness 2. 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/PCM controls generation of alternator with duty from FR terminal when electrical Loads turn on
