DTC P2504 [L8, LF]

id0102b1814200

DTC P2504 | Charging system voltage high input
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DETECTION CONDITION | • The PCM judges the generator output voltage is above 18.5 V or battery voltage is above 16.0 V during the engine running. Diagnostic support note • This is a continuous monitor (other). • The MIL does not illuminate. • FREEZE FRAME DATA (Mode 2/Mode 12) is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Generator connector or terminals malfunction • PCM connector or terminals malfunction • Short to power supply in wiring harness between generator terminal D and PCM terminal 2AI • Generator malfunction • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (other related) been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2 | VERIFY RELATED SERVICE 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 AND TERMINALS • 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 connector or terminals, then go to Step 7.
No | Go to the next step.
4 | INSPECT PCM CONNECTOR AND TERMINALS • Disconnect the PCM connector. • Inspect for poor connection (damaged/pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair or replace the connector or terminals, then go to Step 7.
No | Go to the next step.
5 | INSPECT GENERATOR CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • Generator and PCM connectors are disconnected. • Turn the ignition switch to the ON (engine off). • Measure the voltage between generator terminal D (wiring harness-side) and body ground. • Is there any voltage? | Yes | Repair or replace the wiring harness for a possible short to power supply, then go to Step 7.
No | Go to the next step.
6 | INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [L8, LF].) • Is there any malfunction? | Yes | Replace the generator, then go to the next step. (See GENERATOR REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
7 | VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [L8, LF].) • Perform the KOER self test. (See KOEO/KOER SELF TEST [L8, LF].) • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
8 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
No | DTC troubleshooting completed.