DTC P2504 [LF, L3]

id0102008142a3

DTC P2504

Battery overcharge

DETECTION CONDITION

• The PCM determines that the generator output voltage is above 18.5 V or the battery voltage is above 16.0 V while the engine is running.

POSSIBLE CAUSE

• Short to power circuit between generator connector terminal D and PCM connector terminal 1AD
• Generator malfunction
• PCM and/or generator are improperly connected.

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform the DTC CONFIRMATION PROCEDURE.
• Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT GENERATOR FOR POOR CONNECTION
• Turn the ignition switch to the OFF position.
• Disconnect generator connector.
• Inspect for poor connection
(damaged, pulled-out terminals, corrosion, etc.).
• Is there a malfunction?
Yes
Repair or replace the terminals, then go to Step 7.
No
Go to the next step.
3
CLASSIFY GENERATOR MALFUNCTION OR OTHER MALFUNCTION
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between generator terminal D (harness-side) and body ground.
• Is the voltage B+?
Yes
Go to the next step.
No
Malfunction at generator.
Go to Step 6.
4
INSPECT PCM FOR POOR CONNECTION
• Turn the ignition switch to the OFF position.
• Disconnect the PCM connector.
• Inspect for poor connection
(damaged, pulled-out terminals, corrosion, etc.).
• Is there a malfunction?
Yes
Repair or replace pins, then go to Step 7.
No
Go to the next step.
5
INSPECT GENERATOR CONTROL CIRCUIT FOR SHORT TO POWER
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between generator terminal D (harness-side) and body ground.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for a short to power, then go to Step 7.
No
Go to Step 7.
6
INSPECT GENERATOR CONTROL TERMINAL FOR SHORT TO POWER
• Measure the resistance between generator terminal D (part-side) and body ground.
• Is the voltage B+?
Yes
Repair or replace the generator, then go to Step 7.
No
Go to the next step.
7
VERIFY TROUBLESHOOTING OF DTC P2504 COMPLETED
• Make sure to reconnect all connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the KOER self-test.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
 
to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC troubleshooting.
No
Troubleshooting completed.