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DTC P2502

BHE010202500W01

DTC P2502 | Charging system voltage problem
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DETECTION CONDITION | • The PCM monitors the generator output voltage and the battery voltage when the engine is running. If the generator output voltage is more than 16.9 V and the battery voltage is less than 10.9 V, the PCM determines that there is a charging system voltage malfunction. 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 available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Generator malfunction • Battery malfunction • Connector or terminal malfunction • Open circuit in wiring harness between battery positive terminal and generator terminal B • Short to GND in wiring harness between battery positive terminal and generator terminal B • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
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. • Is there any malfunction? | Yes | Connect the generator terminal B correctly, then go to Step 9.
No | Go to the next step.
4 | INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION.) • Is there any malfunction? | Yes | Replace the generator, then go to Step 9. (See GENERATOR REMOVAL/INSTALLATION.)
No | Go to the next step.
5 | INSPECT CHARGING CIRCUIT FOR SHORT TO GND • Turn the ignition switch off. • Inspect for continuity between generator terminal B (wiring harness-side) and body GND. • Is there continuity? | Yes | Repair or replace the wiring harness for a possible short to GND, then go to Step 9.
No | Go to the next step.
6 | INSPECT BATTERY POSITIVE TERMINAL FOR POOR INSTALLATION • Turn the ignition switch off. • Inspect for looseness of the battery positive terminal. • Is there any malfunction? | Yes | Connect the battery positive terminal correctly, then go to Step 9.
No | Go to the next step.
7 | INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION.) • Is there any malfunction? | Yes | Replace the battery, then go to Step 9. (See BATTERY REMOVAL/INSTALLATION.)
No | Go to the next step.
8 | INSPECT CHARGING CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect for continuity between generator terminal B (wiring harness-side) and battery positive terminal (wiring harness-side). • Is there continuity? | Yes | Repair or replace the wiring harness for a possible open circuit, then go to the next step.
No | Go to the next step.
9 | VERIFY TROUBLESHOOTING OF DTC P2502 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • 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.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE.)
No | DTC troubleshooting completed.