DTC P2502 [13B-MSP]

DIAGNOSTIC PROCEDURE

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 is not available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Connector or terminal malfunction Generator malfunction Short to ground in wiring harness between battery positive terminal and generator terminal 2A Battery malfunction Open circuit in wiring harness between battery positive terminal and generator terminal 2A PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC REFERENCE CHART

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 terminal, then go to Step 8.
2		No	Go to the next step.
3	INSPECT GENERATOR Inspect the generator. (See GENERATOR INSPECTION [13B-MSP] .) Is there any malfunction?	Yes	Replace the generator, then go to Step 8. (See GENERATOR REMOVAL/INSTALLATION [13B-MSP] .)
3		No	Go to the next step.
4	INSPECT CHARGING CIRCUIT FOR SHORT TO GROUND Turn the ignition switch off. Inspect for continuity between generator terminal 2A (wiring harness-side) and body ground. Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 8.
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 8.
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 Step 8. (See BATTERY REMOVAL/INSTALLATION [13B-MSP] .)
6		No	Go to the next step.
7	INSPECT CHARGING CIRCUIT FOR OPEN CIRCUIT Turn the ignition switch off. Inspect for continuity between generator terminal 2A (wiring harness-side) and battery positive terminal (wiring harness-side.) Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P2502 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. Start the engine. Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [13B-MSP] .)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [13B-MSP] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [13B-MSP] .)
9		No	DTC troubleshooting completed.