DTC P2502[MTX, LF ATX (FS5A-EL)]

id0102b4814000

DTC P2502

Charging system voltage problem

DETECTION CONDITION

•  The PCM judges generator output voltage is above 17 V or battery voltage is below 11 V during engine running.

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

•  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

DTC P2502	Charging system voltage problem
DETECTION CONDITION	• The PCM judges generator output voltage is above 17 V or battery voltage is below 11 V during engine running. 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	• 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

Diagnostic procedure

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 SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service 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 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 M-MDS. • 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[LF, L3].)
7		No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Perform “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE[MTX, LF ATX (FS5A-EL)].) • Is there any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE[MTX, LF ATX (FS5A-EL)].)
8		No	Troubleshooting completed.