ISG System has 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.
ECM/PCM set DTC P0620 If it is open or short in Control circuit of alternator. If this DTC is set, Idle stop is not performing.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal check | 1. Open or Short in harness 2. Poor connection or damaged harness |
Enable Conditions |
•
- | |
Threshold Value |
•
Open or Short circuit | |
Diagnostic Time |
•
Continuous | |
MIL ON Condition |
•
DTC only(Idle stop forbidden) |
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
