DTC P2502 [LF, L3]

id0102a3814000

DTC P2502

Charging system voltage problem

DETECTION CONDITION

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

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.
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 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.
No
Go to the next step.
3
INSPECT BATTERY
• Turn the ignition switch to off.
• Inspect battery.
• Is battery normal?
Yes
Go to the next step.
No
Replace battery, then go to Step 7.
4
INSPECT POOR INSTALLATION OF GENERATOR TERMINAL
• Turn the ignition switch to off.
• Inspect for looseness of generator terminal B installation nut.
• Is the nut loose?
Yes
Tighten generator terminal B installation nut, then go to Step 7.
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 battery positive terminal correctly, then go to Step 7.
No
Go to the next step.
6
INSPECT BATTERY CHARGING CIRCUIT
• Disconnect the generator terminal B.
• Measure the voltage between the generator terminal B (wiring harness-side) and the body ground.
• Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace wiring harness between the generator terminal B and the battery positive terminal, then go to the next step.
7
VERIFY TROUBLESHOOTING OF DTC P2502 COMPLETED
• Make sure to reconnect all connectors.
• Clear DTC from memory using WDS or equivalent.
• Start the engine.
• Is same DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC troubleshooting.
No
Troubleshooting completed.