DTC P2503 [LF, L3]

id0102008141a3

DTC P2503

No electricity from generator output for voltage signal

DETECTION CONDITION

• The PCM needs more than 20 A from the generator, and determines the generator output voltage to be below 8.5 V while the engine is running.

POSSIBLE CAUSE

• Generator malfunction
• PCM and/or generator are poorly connected.
• Open and/or short to ground in wiring harness from between generator terminal P and PCM terminal 1AA
• Open and/or short to ground in wiring harness from between generator terminal D and PCM terminal 1AD
• Drive belt not properly adjusted

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform the DTC CONFIRMATION PROCEDURE.
• Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT DRIVE BELT CONDITION
• Verify that the drive belt auto tensioner indicator mark does not exceed the limit.
• Is the front drive belt normal?
Yes
Go to the next step.
No
Replace and/or adjust drive belt, then go to Step 9.
3
INSPECT PCM FOR POOR CONNECTION
• Turn the ignition switch to the OFF position.
• Disconnect the PCM connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there a malfunction?
Yes
Repair the terminals, then go to Step 9.
No
Go to the next step.
4
INSPECT GENERATOR FOR POOR CONNECTION
• Disconnect the generator connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there a malfunction?
Yes
Repair or replace the terminals, then go to Step 9.
No
Go to the next step.
5
INSPECT GENERATOR CONTROL CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between generator terminal D (harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for a short to ground, then go to Step 9.
No
Go to the next step.
6
INSPECT GENERATOR OUTPUT VOLTAGE MONITOR CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between generator terminal P (harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for a short to ground, then go to Step 9.
No
Go to the next step.
7
INSPECT GENERATOR CONTROL CIRCUIT FOR OPEN CIRCUIT
• Measure the resistance between generator terminal D (harness-side) and PCM terminal 1AD (harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for an open circuit, then go to Step 9.
8
INSPECT GENERATOR OUTPUT VOLTAGE MONITOR CIRCUIT for an open circuit CIRCUIT
• Measure the resistance between generator terminal P (harness-side) and PCM terminal 1AA (harness-side).
• Is there continuity?
Yes
Repair or replace the generator, then go to the next step.
No
Repair or replace the wiring harness for an open circuit, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P2503 COMPLETED
• Make sure to reconnect all connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• 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.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC troubleshooting.
No
Troubleshooting completed.