DTC P2502 [L8, LF]

id0102b1814000

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.
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 during the first drive cycle.
• FREEZE FRAME DATA is 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
• Have 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 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.
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.
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.
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.
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.
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.
• Perform the KOER self-test.
• Is the same DTC present?
Yes
Replace the 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 the applicable DTC inspection.
No
Troubleshooting completed.