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 above 16.1V, ECM sets P0563.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Signal check, high |
•
Poor connection
•
Short in circuit
•
Faulty charging system
•
Faulty main relay
•
Faulty ECM |
Enable Conditions |
•
After Start > 120 sec
•
Vehicle speed > 16 kph | |
Threshold value |
•
System voltage > 17V | |
Diagnosis Time |
•
Continuous | |
MIL On Condition |
•
No MIL |
