DTC P2503:00 [L8, LF, L5]

id010242709600

DTC P2503:00

Charging system voltage low

DETECTION CONDITION

•  The PCM needs more than 20 A from the generator, and determines that the generator output voltage is be below 8.5 V while the engine running.

Diagnostic support note

•  This is a continuous monitor (Other).

•  The MIL does not illuminate.

•  FREEZE FRAME DATA is not available.

•  The DTC is stored in the PCM memory.

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 2AF

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

•  Drive belt misadjustment

DTC P2503:00	Charging system voltage low
DETECTION CONDITION	• The PCM needs more than 20 A from the generator, and determines that the generator output voltage is be below 8.5 V while the engine running. Diagnostic support note • This is a continuous monitor (Other). • The MIL does not illuminate. • FREEZE FRAME DATA is not available. • The DTC is stored in the PCM memory.
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 2AF • Open and/or short to ground in wiring from between generator terminal D and PCM terminal 2AA • Drive belt 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 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 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 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.
3		No	Replace and/or adjust drive belt, then go to Step 10. (See DRIVE BELT REMOVAL/INSTALLATION [L8, LF, L5].)
4	INSPECT POOR CONNECTION OF PCM CONNECTOR • Switch the ignition to off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 10.
4		No	Go to the next step.
5	INSPECT POOR CONNECTION OF GENERATOR CONNECTOR • Switch the ignition to off. • Disconnect the generator connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, 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 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 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 2AA (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 2AF (wiring harness-side). • Is there continuity?	Yes	Repair or replace the generator, then go to the next step. (See GENERATOR REMOVAL/INSTALLATION [L8, LF, L5].)
9		No	Repair or replace the wiring harness for an open circuit, then go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P2503:00 COMPLETED • Make sure to reconnect all connectors. • Clear the DTC from the PCM memory using the M-MDS. • Perform the KOER self-test. (See KOEO/KOER SELF TEST [L8, LF, L5].) • Is the DTC P2503:00 present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L5].)
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF, L5].) • Is any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L5].)
11		No	Troubleshooting completed.