Symptom:
P0563-BATTERY VOLTAGE HIGH
When Monitored and Set Condition:
P0563-BATTERY VOLTAGE HIGH
When Monitored: The engine running. The engine speed greater than 380 RPM.
Set Condition: Battery voltage is 1 volt greater than desired system voltage. One Trip
Fault
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
GENERATOR OPERATION
(K20) GEN FIELD CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
PCM
TEST ACTION APPLICABILITY
1 NOTE: Ensure the Battery is in good condition. Using the Midtronics
Battery Tester, test the Battery before continuing.
NOTE: Inspect the vehicle for aftermarket accessories that may exceed the
Generator System output.
Turn the ignition off.
NOTE: Ensure the generator drive belt is in good operating condition.
NOTE: Inspect the fuses in the PDC. If a fuse is found to be open use the
wiring diagram/schematic as a guide, inspect the wiring and connectors for
damage.
Ignition on, engine not running.
With the DRBIIIt, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes → Go To 2
No → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-3-NGC.
2 Turn the ignition off.
Disconnect the Generator Field harness connector.
Using a 12-volt test light, jumper it across the Generator Field harness connector.
Ignition on, engine not running.
With the DRBIIIt, actuate the Generator Field Driver circuit.
Does the test light illuminate brightly and flash on and off?
All
Yes → Go To 4
No → Go To 3
219
DRIVEABILITY - NGC
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