The ECM provides ground to one side of the coil of the main relay and the other side is connected to the battery. The ECM monitors battery voltage and the voltage after the main relay.
During engine running, if system voltage is below 11V, ECM sets P0562. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Voltage too low | 1. Poor connection 2. Open in circuit 3. Faulty charging system 4. Faulty main relay 5. Faulty ECM |
Enable Conditions |
•
Engine works | |
Threshold value |
•
System voltage < 11V | |
Diagnosis Time |
•
Continuous | |
MIL On Condition |
•
2 driving cycles |
Coil Resistance | 70Ω ~ 120Ω |
Fig.1) Normal waveforms of IG, L terminal of alternator during charge warning lamp is ON
Fig.2) Normal waveforms of IG, L terminal of alternator during charge warning lamp is OFF
Fig.3) Normal waveforms of COM, FR terminal of alternator at idle.
Fig.4) Normal waveforms of COM, FR terminal of alternator under connector disconnected condition.
