DTC P2502 [13B-MSP]

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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

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY RELATED SERVICE INFORMATION AVAILBAILITY
•  Verify related Service information availability.
•  Is any related Service information available?
Yes
Perform repair or diagnosis according to thavailable Service information.
•  If the vehicle is not repaired, go to the next step.
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.
No
Go to the next step.
3
INSPECT GENERATOR
•  Inspect the generator.
•  Is there any malfunction?
Yes
Replace the generator, then go to Step 8.
(See GENERATOR REMOVAL/INSTALLATION [13B-MSP].)
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.
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.
No
Go to the next step.
6
INSPECT BATTERY
•  Inspect the battery.
•  Is there any malfunction?
Yes
Replace the battery, then go to Step 8.
(See BATTERY REMOVAL/INSTALLATION [13B-MSP].)
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.
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].)
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [13B-MSP].)
No
DTC troubleshooting completed.