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 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: 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.





Is the DTC Active at this time?

Yes
  • Go To 2


No

2.GENERATOR OPERATION






NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation.





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

Yes


No
  • Go To 3

3.(K125) FIELD CIRCUIT SHORTED BATTERY VOLTAGE








Is the voltage above 1.0 volt?

Yes


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.




Were there any problems found?

Yes


No