DTC P2502:00

DTC P2502:00	Charging system voltage problem
DETECTION CONDITION	The PCM determines that the generator output voltage is above 17 V or battery voltage is below 11V while the engine is running. Diagnostic support note This is a continuous monitor (other). The MIL does not illuminate. FREEZE FRAME DATA (Mode 2)/Snapshot data is not available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Battery malfunction Poor installation of generator terminal Short to ground or open circuit in generator power supply circuit Short to ground in wiring harness between generator terminal B and battery positive terminal STARTER 250 A (LF)/450 A (L5) fuse malfunction Open circuit in wiring harness between generator terminal B and battery positive terminal Generator malfunction PCM malfunction

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 BATTERY Switch the ignition to off. Inspect the battery. (See BATTERY INSPECTION [LF, L5] ). Is there any malfunction?	Yes	Recharge or replace the battery, then go to Step 6. (See BATTERY RECHARGING [LF, L5] ). (See BATTERY REMOVAL/INSTALLATION [LF, L5] ).
2		No	Go to the next step.
3	INSPECT POOR INSTALLATION OF GENERATOR TERMINAL Switch the ignition to off. Disconnect the generator connector. Inspect for looseness of generator terminal B installation nut. Is the nut loose?	Yes	Tighten generator terminal B installation nut, then go to Step 6.
3		No	Go to the next step.
4	INSPECT BATTERY CHARGING CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT Generator connector is disconnected. Switch the ignition to ON (engine oft). Measure the voltage between generator terminal B (wiring harness-side) and body ground. Is the voltage B+ ?	Yes	Go to the next step.
4		No	Inspect the STARTER 250 A (LF)/450 A (L5) fuse. If the fuse is melted: Repair or replace the wiring harness for a possible short to ground. Replace the fuse. If the fuse is deteriorated: Replace the fuse. If the fuse is normal: Repair or replace the wiring harness for a possible open circuit. Go to Step 6.
5	INSPECT GENERATOR Inspect the generator. (See GENERATOR INSPECTION [LF, L5] ). Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to the next step. (See GENERATOR DISASSEMBLY/ASSEMBLY [LF, L5] ).
5		No	Go to the next step.
6	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 ). Perform the KOER self test. (See KOEO/KOER SELF TEST ). Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION ). Go to the next step.
6		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 inspection. (See DTC TABLE ).
7		No	DTC troubleshooting completed.