P2503-CHARGING SYSTEM OUTPUT LOW





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    The engine running. The engine RPM is high enough to assure sufficient generator current output to satisfy the electrical loads.

  • Set Condition:

    The battery sensed voltage is less than the target charging voltage, during engine operation, for a calibrateable amount of time. One Trip Fault. Generator light will illuminate.


Possible Causes
  
LOOSE ACCESSORY DRIVE BELT
  
EXCESSIVE RESISTANCE IN THE (A11) BATTERY POSITIVE CIRCUIT
  
GENERATOR
  
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.FUSED B+ CIRCUIT HIGH RESISTANCE

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 3

3.GENERATOR OPERATION






NOTE: The DTC needs to be cleared before actuating the Solenoid, if the DTC is not cleared, the Solenoid may not be allowed to actuate.





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

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