DTC P2502

DETECTION CONDITION AND POSSIBLE CAUSE (DTC P2502 - LF, L3)

DTC P2502	Charging system voltage problem
DETECTION CONDITION	The PCM judges generator output voltage is above 17 V or battery voltage is below 11V during engine 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. The DTC 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
Courtesy of MAZDA MOTORS CORP.

DIAGNOSTIC PROCEDURE CHART

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		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 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.
2		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.
3		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.
4		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.
5		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.
6		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. Start the engine, or 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 "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE ). Is there any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE ).
8		No	Troubleshooting completed.