DTC P2503 [LF]

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DTC P2503 [LF]

B3E010201083W04

DTC P2503 | Charging system voltage low
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DETECTION CONDITION | • PCM needs more than 20 A from generator, and judges generator output voltage to be below 8.5 V during engine 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 2AM
• Open and/or short to GND in wiring from between generator terminal D and PCM terminal 2AQ
• Drive belt misadjustment

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | INSPECT DRIVE BELT CONDITION • Verify that drive belt auto tensioner indicator mark does not exceed limit. • Is front drive belt normal? | Yes | Go to the next step.
No | Replace and/or adjust drive belt, then go to Step 10.
4 | INSPECT POOR CONNECTION OF PCM CONNECTOR • Turn the ignition switch to off. • Disconnect PCM connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there a malfunction? | Yes | Repair terminals, then go to Step 10.
No | Go to the next step.
5 | INSPECT POOR CONNECTION OF GENERATOR CONNECTOR • Disconnect generator connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there a malfunction? | Yes | Repair or replace terminals, then go to Step 10.
No | Go to the next step.
6 | 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 wiring harness for short to ground, then go to Step 10.
No | Go to the next step.
7 | 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 wiring harness for short to ground, then go to Step 10.
No | Go to the next step.
8 | INSPECT GENERATOR CONTROL CIRCUIT FOR OPEN • Inspect for continuity between generator terminal D (wiring harness-side) and PCM terminal 2AQ (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 10.
9 | INSPECT GENERATOR OUTPUT VOLTAGE MONITOR CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between generator terminal P (wiring harness-side) and PCM terminal 2AM (wiring harness-side). • Is there continuity? | Yes | Repair or replace generator, then go to the next step.
No | Repair or replace wiring harness for open circuit, then go to the next step.
10 | VERIFY TROUBLESHOOTING OF DTC P2503 COMPLETED • Make sure to reconnect all connectors. • Clear DTC from PCM memory using WDS or equivalent. • Start the engine. • Is the same DTC present? | Yes | Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [LF].)
No | Go to the next step.
11 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [LF].) • Is there any DTC present? | Yes | Go to applicable DTC troubleshooting. (See DTC TABLE [LF].)
No | Troubleshooting completed.