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DTC P2502

DTC P2502

Charging system voltage problem

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.
FREEZE FRAME DATA (Mode 2/Mode 12) is not available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

Generator connector or terminals malfunction
Short to ground or open circuit in generator power supply circuit
- Short to ground in wiring harness between battery positive terminal and generator terminal 2A
- MAIN 120 A fuse malfunction
- Open circuit in wiring harness between battery positive terminal and generator terminal 2A
Generator malfunction
Battery positive terminal poor installation
Battery malfunction
PCM malfunction

G07878161

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line 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.
1		No	Go to the next step.
2	INSPECT GENERATOR CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect the generator connector. Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 7.
2		No	Go to the next step.
3	INSPECT BATTERY CHARGING CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT Generator connector is disconnected. Measure the voltage between generator terminal 2A (wiring harness-side) and body ground. Is the voltage B+ ?	Yes	Go to the next step.
3		No	Inspect the MAIN 120 A fuse. If the fuse is melt: Repair or replace the wiring harness for a possible short to ground. Replace the fuse. If the fuse is deterioration: Replace the fuse. If the fuse is normal: Repair or replace the wiring harness for a possible open circuit. Go to Step 7.
4	INSPECT GENERATOR Inspect the generator. (See GENERATOR INSPECTION [13B-MSP] ). Is there any malfunction?	Yes	Replace the generator, then go to Step 7. (See GENERATOR REMOVAL/INSTALLATION [13B-MSP] ).
4		No	Go to the next step.
5	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 7.
5		No	Go to the next step.
6	INSPECT BATTERY Inspect the battery. (See BATTERY INSPECTION [13B-MSP] ). Is there any malfunction?	Yes	Replace the battery, then go to the next step. (See BATTERY REMOVAL/INSTALLATION [13B-MSP] ).
6		No	Go to the next step.
7	VERIFY TROUBLESHOOTING OF DTC P2502 COMPLETED Mate sure to reconnect ail disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE ). 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
7		No	Go to the next step.
8	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 ).
8		No	DTC troubleshooting completed.