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DTC P2503

id010200814100

DTC P2503 | No electricity from generator output voltage for signal
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DETECTION CONDITION | • The PCM needs 20 A or more from the generator, and determines the generator output voltage is 8.5 V or less while the engine is running.
POSSIBLE CAUSE | • Generator malfunction • PCM and/or generator are poorly connected. • Open and/or short to ground in wiring from between generator terminal P and PCM terminal 2AR • Open and/or short to ground in wiring from between generator terminal D and PCM terminal 2AN • Drive belt not properly adjusted

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See 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. (See INTERMITTENT CONCERN TROUBLESHOOTING.)
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 the drive belt, then go to Step 9.
3 | INSPECT PCM FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any 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 (such as damaged, pulled-out pins, and 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 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 (wiring 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 FOR OPEN CIRCUIT • Measure the resistance between generator terminal D (wiring harness-side) and PCM terminal 2AN. • 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 OPEN CIRCUIT • Measure the resistance between generator terminal P (wiring harness-side) and PCM terminal 2AR. • Is there continuity? | Yes | Repair or replace generator, then go to the next step.
No | Repair or replace the wiring harness for an open, 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. (See KOEO/KOER SELF-TEST.) • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE.)
No | Troubleshooting completed.