The PCM provides ground to one side of the coil of the main relay and the other side is connected to the battery. The PCM monitors battery voltage and the voltage after the main relay.
System Voltage is the ignition voltage potential at the Powertrain Control Module (PCM). PCM measures and compares voltage from ignition key and each relay. With this mechanism, PCM knows if the main relay switch turns on after IG on or if turns OFF after IG off.
During engine running, if battery voltage is below 11V, PCM sets P0562. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till cosecutive 2 driving cycle.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Voltage too low | ● Poor connection ● Open in power circuit ● Faulty charging system ● Faulty main relay ● Faulty PCM |
Enable Conditions | ● Engine works ● 11V ≤ Battery voltage ≤ 16V | |
Threshold value | ● System voltage < 11V | |
Diagnosis Time | ● Continuous | |
MIL On Condition | ● 2 driving cycles |
Coil Resistance | 70Ω ~ 120Ω |
