DTC P2503[L3 Turbo]

id0102b7814100

DTC P2503

Charging system voltage low

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 2AJ

•  Open and/or short to ground in the wiring harness from between generator terminal D and PCM terminal 2AI

•  Drive chain misadjustment

DTC P2503	Charging system voltage low
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 2AJ • Open and/or short to ground in the wiring harness from between generator terminal D and PCM terminal 2AI • Drive chain misadjustment

Diagnostic procedure

STEP	INSPECTION		ACTION
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.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform the repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
2		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.
3		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.
4		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.
5		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.
6		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.
7		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 2AI (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
8		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 2AJ (wiring harness-side). • Is there continuity?	Yes	Repair or replace the generator, then go to the next step.
9		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 M-MDS. • Start the engine. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION[L3 Turbo].)
10		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].)
11		No	Troubleshooting completed.