P0563-BATTERY VOLTAGE HIGH





For a complete wiring diagram Refer to Section 8W.



Possible Causes
(K125) GENERATOR FIELD CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
GENERATOR
PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1. ACTIVE DTC

NOTE: Make sure the Battery is in good condition. Using the Midtronics Battery Tester, test the Battery before continuing.

NOTE: Inspect the vehicle for after market accessories that may exceed the Generator System output.

NOTE: Inspect the fuses in the TIPM. If a fuse is open use the wire diagram/schematic as a guide, inspect the wiring and connectors for damage.


Start the engine.
Allow the engine to idle.
With the scan tool, select View DTCs.

Is the DTC Active at this time?

Yes


No

2. GENERATOR OPERATION



Turn the ignition off.
Disconnect the Generator Field harness connector.
Using a 12-volt test light connected to ground, probe the (K125) Generator Field Control circuit in the Generator Field harness connector.
Ignition on, engine not running.
With the scan tool, actuate the Gen Field Control circuit.

Does the test light illuminate brightly and flash on and off?

Yes


No

3. (K125) FIELD CIRCUIT SHORTED BATTERY VOLTAGE



Turn the ignition off.
Disconnect the C2 PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (K125) Gen Field Control circuit at the Generator Field harness connector.

Is the voltage above 1.0 volt?

Yes


No

4. PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.


Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes


No