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DTC P2503 [L3 Turbo]

id0102b7814100

DTC P2503 | Charging system voltage low
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DETECTION CONDITION | • PCM needs more than 20 A from the generator, and determines that generator output voltage is below 8.5 V while the engine is running. Diagnostic support note • This is a continuous monitor (Other). • The MIL does not illuminate. • FREEZE FRAME DATA is not available. • DTCs are stored in the PCM memory.
POSSIBLE CAUSE | • Generator malfunction • PCM and/or generator are poorly connected • Open and/or short to ground in the wiring harness from between generator terminal P and PCM terminal 1AB • Open and/or short to ground in the wiring harness from between generator terminal D and PCM terminal 1AD • Drive chain misadjustment

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS 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 Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service information. If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | INSPECT DRIVE CHAIN CONDITION • Verify that the drive chain auto tensioner indicator mark does not exceed limit. • Is the front drive chain normal? | Yes | Go to the next step.
No | Replace the and/or adjust drive chain, then go to Step 10.
4 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair the terminals, then go to Step 10.
No | Go to the next step.
5 | INSPECT GENERATOR CONNECTOR FOR POOR CONNECTION • Disconnect the generator connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair or replace the 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 the wiring harness for a 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 the wiring harness for a 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 1AD (wiring 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 10.
9 | INSPECT GENERATOR OUTPUT VOLTAGE MONITOR CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between generator terminal P (wiring harness-side) and PCM terminal 1AB (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 an open circuit, then go to the next step.
10 | VERIFY TROUBLESHOOTING OF DTC P2503 COMPLETED • Make sure to reconnect all connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3 Turbo].)
No | Go to the next step.
11 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L3 Turbo].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L3 Turbo].)
No | Troubleshooting completed.