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 with the battery voltage, current, temperature information from battery sensor. The more electrical load, the higher duty output.
ECM 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 |
•
Open or Short in harness
•
Poor connection or damaged harness |
Enable Conditions |
•
Desired alternator voltage duty cycle ≥ 3.12%, ≤ 94.5%
•
Engine speed >240rpm
•
Battery voltage <16V, >10.73V | |
Threshold value |
•
Open or Short circuit | |
Diagnosis Time |
•
1sec | |
MIL On Condition |
•
DTC only(Idle stop forbidden) |
Idle Status
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
