DTC P2503 [L3]

BME010202500W02

DTC P2503

Generator output voltage signal no electricity

DETECTION CONDITION

• PCM needs more than 20 A from generator, and judges generator output voltage to be below 8.5 V when engine is running.

POSSIBLE CAUSE

• Generator malfunction
• PCM and/or generator are poorly connected.
• Open and/or short to GND in wiring from between generator terminal P and PCM terminal 1AA
• Open and/or short to GND in wiring from between generator terminal D and PCM terminal 1AD
• Drive belt misadjustment

Diagnostic procedure

STEP

INSPECTION

ACTION

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