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DTC P2503 [L3]

BME010202500202

DTC P2503 | Generator output voltage signal no electricity
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DETECTION CONDITION | • The PCM needs more than 20 A from generator, and judges generator output voltage to be below 8.5 V when the 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
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1 | PERFORM DTC CONFIRMATION PROCEDURE • Perform DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE [L3].) • Is the same DTC present? | Yes | Go to the next step.
No | Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3].)
2 | INSPECT DRIVE BELT CONDITION • Verify that the drive belt auto tensioner indicator mark does not exceed limit. • Is the front drive belt normal? | Yes | Go to the next step.
No | Replace and/or adjust the drive belt, then go to Step 9.
3 | INSPECT POOR CONNECTION OF PCM CONNECTOR • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Is there any malfunction? | Yes | Repair the terminals, then go to Step 9.
No | Go to the next step.
4 | INSPECT POOR CONNECTION OF GENERATOR CONNECTOR • Disconnect generator connector. • Inspect for poor connection (such as damaged/pulled-out terminals, corrosion). • Is there any 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 (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness for 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 (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness for short to ground, then go to Step 9.
No | Go to the next step.
7 | INSPECT GENERATOR CONTROL CIRCUIT FOR OPEN • Measure the resistance between generator terminal D (wiring harness-side) and PCM terminal 1AD (wiring harness-side). • Is there continuity? | Yes | Go to the next step.
No | Repair or replace wiring harness for open circuit, then go to Step 9.
8 | INSPECT GENERATOR OUTPUT VOLTAGE MONITOR CIRCUIT FOR OPEN CIRCUIT • Measure the resistance between generator terminal P (wiring harness-side) and PCM terminal 1AA (wiring 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 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 KOER self-test. (See KOEO/KOER SELF-TEST PROCEDURE [L3].)
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L3].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L3].)
No | Troubleshooting completed.