2014 Jeep Wrangler JK Factory Service Manual 28 - DTC-Based Diagnostics

P2504-CHARGING SYSTEM OUTPUT HIGH

For a complete wiring diagram, refer to the Wiring Information.



Possible Causes

EXCESSIVE RESISTANCE IN THE (A209) BATTERY FEED CIRCUIT
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).


1. ACTIVE DIAGNOSTIC TROUBLE CODE (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.
1. Ignition on, engine not running.
2. With a scan tool, select View DTCs.
3. Read and record the related Freeze Frame data for P2504.
4. With a scan tool, erase DTCs.
5. Start the engine.
6. Allow the idle to stabilize.
7. Using the scan tool, read the active DTCs.


Is the DTC Active at this time?

Yes


No


2. (A801) BATTERY POSITIVE CIRCUIT VISUAL INSPECTION

1. Turn the ignition off.
2. Inspect the (A801) Battery Positive circuit at Generator Output post for corrosion and looseness.
3. Inspect the Battery positive and negative cables for corrosion and looseness.
4. Inspect the (A801) Battery Positive circuit at the Battery positive post for corrosion and looseness.


Were any problems found?

Yes


No


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

1. Disconnect the PCM C2 harness connector.
2. Inspect the Engine Control Direct Battery Feed Fuse in the PDC.
3. Perform a voltage drop test on the (A209) Battery Feed circuit from the PCM C2 harness connector to the PDC Fuse Panel.
4. Using a Voltmeter probe the PCM C2 harness connector with the Negative lead of the Voltmeter and back probe the (A209) Battery Feed circuit at the PDC Fuse Panel with the Positive lead of the Voltmeter.

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 may result in possible serious or fatal injury.

5. Start the engine
6. Monitor the Voltmeter.


Is the voltage above 0.4 Volt?

Yes


No


4. POWERTRAIN CONTROL MODULE (PCM)

1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Generator and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Generator and the Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.


Were there any problems found?

Yes


No