P0563

Diagnostic Chart:

Schematic:

The PCM monitors ignition voltage on circuit 839 at all times with reference to circuit 451 (ground) when the engine is running. Ignition voltage from circuit 439 can be read on the Scan tool as IGNITION 1 voltage. DTC P0562 sets when the PCM detects low system voltage. DTC P0563 sets when the PCM detects high system voltage. These values are out of the normal charging system voltage range.

DTC PARAMETERS
DTC P0563 will set if ignition voltage is greater than 17 volts when:
^ Engine is running
^ Condition exists for longer than 4 minutes
^ Voltage of 17 volts occurs twice in the ignition cycle

DTC P0563 diagnostics run continuously with engine running.

P0563 are (type L)) DTCs

DIAGNOSTIC AIDS
If DTC P0621 is set, diagnose that DTC first. A circuit fault in the generator L-terminal circuit will cause the generator not to charge and may set DTC P0562.

To locate an intermittent problem, use Scan tool to monitor IGNITION 1 voltage with engine running. With all accessories On or all accessories Off. Changing voltage should be in the range of 12.5 - 15.5 volts.

With engine Off, compare IGNITION 1 voltage on Scan tool with actual battery voltage with a DVOM. If readings do not fall within ± 0.2 volts, check circuit 839 and 451 for corrosion and tightness.

Perform a charging system test. Refer to "Starting and Charging Section". Testing and Inspection