P2504-CHARGING SYSTEM OUTPUT HIGH





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    The engine running. The engine speed greater than 1157 RPM.

  • Set Condition:

    The alternator B+ voltage sense circuit voltage reading exceeds the direct Battery B+ sense circuit. The Generator Output terminal is not connected to the Battery B+ post. One trip fault.


Possible Causes
  
EXCESSIVE RESISTANCE IN THE (A209) BATTERY FEED CIRCUIT
  
PCM
  

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



Diagnostic Test

1.ACTIVE DTC

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

NOTE: The battery must be fully charged.

NOTE: The Generator belt tension and condition must be checked before continuing.










Is the DTC Active at this time?

Yes
  • Go To 2


No

2.(A11) BATTERY POSITIVE CIRCUIT VISUAL INSPECTION






Were any problems found?

Yes


No
  • Go To 3

3.EXCESSIVE RESISTANCE IN THE (A209) BATTERY FEED CIRCUIT

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 and #8815-1 to perform diagnosis.






WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.





Is the voltage above 0.4 of a 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