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DTC P2502

id010200814000

DTC P2502 | Generator terminal B circuit open
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DETECTION CONDITION | • The PCM determines that the generator output voltage is 17 V or more and the battery voltage is 11 V or less while the engine is running.
POSSIBLE CAUSE | • Open circuit between generator terminal B and battery positive terminal • Battery malfunction • Generator malfunction • PCM is improperly connected. • PCM, generator, and/or battery are improperly connected.

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See 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. (See INTERMITTENT CONCERN TROUBLESHOOTING.)
2 | INSPECT BATTERY • Turn the ignition switch off. • Inspect the battery. • Is the battery normal? | Yes | Replace the battery, then go to Step 6.
No | Go to the next step.
3 | INSPECT GENERATOR TERMINAL FOR POOR INSTALLATION • Turn the ignition switch off. • Inspect for looseness of the generator terminal B installation nut. • Is the nut loose? | Yes | Tighten the generator terminal B installation nut, then go to Step 6.
No | Go to the next step.
4 | INSPECT BATTERY POSITIVE TERMINAL FOR POOR INSTALLATION • Inspect for looseness of the battery positive terminal. • Is the terminal loose? | Yes | Connect the battery positive terminal correctly, then go to Step 6.
No | Go to the next step.
5 | INSPECT BATTERY CHARGING CIRCUIT • Start the engine. • Disconnect the battery positive terminal. • Does the engine stall? | Yes | Repair or replace the wiring harness between generator terminal B and the battery positive terminal, then go to the next step.
No | Go to the next step.
6 | 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.) • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
No | Go to the next step.
7 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE.)
No | Troubleshooting completed.