P0563-BATTERY VOLTAGE HIGH
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on. Engine RPM greater than 1000 RPM. With no other charging system codes set.
- Set Condition:
Battery voltage is 1 volt greater than desired voltage for more than 10 seconds. Battery voltage greater than 15.75 volts. One Trip Fault. Three good trips to turn off the MIL.
| 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 DTCNOTE: 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: Make sure the generator drive belt is in good operating condition.
NOTE: Inspect the fuses in the IPM. If a fuse is open use the wire diagram/schematic as a guide, inspect the wiring and connectors for damage.
Ignition on, engine not running.
With a scan tool, select View DTCs.
Is the DTC Active at this time?
Yes
- Go To 2
No
- Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2. GENERATOR OPERATION
Turn the ignition off.
Disconnect the Generator Field harness connector.
Using a 12-volt test light connected to ground, probe the (K20) Generator Field Control circuit in the Generator Field harness connector.
NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation.
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
- Replace the Generator.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 3
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
- Repair the short to battery voltage in the (K125) Gen Field Control circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 4
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
- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Replace and program the Powertrain Control Module per Service Information.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)