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DTC P2504 [L8, LF, L3]

id0102a1814200

DTC P2504 | Charging system voltage high
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DETECTION CONDITION | • The PCM determines that the generator output voltage is above 18.5 V or battery voltage is above 16.0 V while the engine running. Diagnostic support note • This is a continuous monitor (Other). • The MIL does not illuminate. • PENDING CODE is available if the PCM detects the above malfunction condition. • FREEZE FRAME DATA is not available. • Are any DTCs is stored in the PCM memory.
POSSIBLE CAUSE | • Short to power circuit between generator connector terminal D and PCM connector terminal 2AI • Generator malfunction • PCM and/or generator are poorly connected

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service information. If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | INSPECT GENERATOR CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the generator connector. • Inspect for poor connection (damaged/pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair or replace the terminals, then go to Step 7.
No | Go to the next step.
4 | CLASSIFY GENERATOR MALFUNCTION OR OTHER MALFUNCTION • Turn the ignition switch to the ON (Engine off). • Measure the voltage between generator terminal D (wiring harness-side) and body ground. • Is the voltage B+? | Yes | Go to the next step.
No | There is a malfunction at the generator. Go to Step 6.
5 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (damaged/pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair or replace pins, then go to Step 7.
No | Go to the next step.
6 | 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 (wiring harness-side) and body ground. • Is the voltage B+? | Yes | Repair or replace the wiring harness for short to power supply, then go to the next step.
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. (See KOEO/KOER SELF TEST [L8, LF, L3].) • Is the DTC P2504 present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L3].)
No | Go to the next step.
8 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Is any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.