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DTC P2502 [L8, LF, L3]

id0102a1814000

DTC P2502 | Charging system voltage problem
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DETECTION CONDITION | • The PCM determines that the generator output voltage is above 17 V or battery voltage is below 11 V while the engine is 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 | • Open circuit between generator terminal B and battery positive terminal • Battery malfunction • Generator malfunction • PCM is poorly connected • PCM, generator and/or battery 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 BATTERY • Turn the ignition switch off. • Inspect the battery. • Is the battery normal? | Yes | Go to the next step.
No | Replace the battery, then go to Step 7.
4 | INSPECT POOR INSTALLATION OF GENERATOR TERMINAL • Turn the ignition switch off. • Inspect for looseness of generator terminal B installation nut. • Is nut loose? | Yes | Tighten generator terminal B installation nut, then go to Step 7.
No | Go to the next step.
5 | INSPECT POOR INSTALLATION OF BATTERY POSITIVE TERMINAL • Inspect for looseness of battery positive terminal. • Is the terminal loose? | Yes | Connect the battery positive terminal correctly, then go to Step 7.
No | Go to the next step.
6 | INSPECT BATTERY CHARGING CIRCUIT • Disconnect the generator terminal B. • Measure the voltage between generator terminal B (wiring harness-side) and body ground. • Is the voltage B+? | Yes | Go to the next step.
No | Repair or replace the wiring harness between generator terminal B and battery positive terminal, then go to the next step.
7 | VERIFY TROUBLESHOOTING OF DTC P2502 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 P2502 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].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.