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.
PCM sets DTC P0562 if the PCM detects system voltage lower than the possible range of battery voltage.
Item
Detecting Condition
Possible Cause
DTC Strategy
Battery voltage check
Poor connection or damaged harness
Faulty charging system
Enable Conditions
No relevant error
Vehicle speed > 6 MPH
Threshold Value
Battery voltage < 10V
Diagnostic Time
30 sec.
MIL On Condition
2 Drive Cycles