DTC P2503 [L8, LF]

id0102b1814100

DTC P2503

Charging system voltage low input

DETECTION CONDITION

•  The PCM needs more than 20 A from generator, and judges generator output voltage to be below 8.5 V during the engine running.

Diagnostic support note

•  This is a continuous monitor (other).

•  The MIL does not illuminate.

•  FREEZE FRAME DATA (Mode 2/Mode 12) is available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  Drive belt exceed limit

•  Generator connector or terminals malfunction

•  PCM connector or terminals malfunction

•  Short to ground in wiring harness between the following terminals:

―  Generator terminal D and PCM terminal 2AI

―  Generator terminal P and PCM terminal 2AJ

•  Open circuit in wiring harness between the following terminals:

―  Generator terminal D and PCM terminal 2AI

―  Generator terminal P and PCM terminal 2AJ

•  Generator malfunction

•  PCM malfunction

DTC P2503	Charging system voltage low input
DETECTION CONDITION	• The PCM needs more than 20 A from generator, and judges generator output voltage to be below 8.5 V during the engine running. Diagnostic support note • This is a continuous monitor (other). • The MIL does not illuminate. • FREEZE FRAME DATA (Mode 2/Mode 12) is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Drive belt exceed limit • Generator connector or terminals malfunction • PCM connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― Generator terminal D and PCM terminal 2AI ― Generator terminal P and PCM terminal 2AJ • Open circuit in wiring harness between the following terminals: ― Generator terminal D and PCM terminal 2AI ― Generator terminal P and PCM terminal 2AJ • Generator malfunction • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (other related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS on 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 the drive belt auto tensioner indicator mark does not exceed limit. • Does the indicator mark exceed limit?	Yes	Replace the drive belt, then go to Step 9. (See DRIVE BELT REPLACEMENT [L8, LF].)
3		No	Go to the next step.
4	INSPECT GENERATOR CONNECTOR CONDITION • Turn the ignition switch off. • Disconnect the generator connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 9.
4		No	Go to the next step.
5	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 9.
5		No	Go to the next step.
6	INSPECT GENERATOR CIRCUIT FOR SHORT TO GROUND • Generator and PCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Generator terminal D ― Generator terminal P • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 9.
6		No	Go to the next step.
7	INSPECT GENERATOR CIRCUIT FOR OPEN CIRCUIT • Generator and PCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― Generator terminal D and PCM terminal 2AI ― Generator terminal P and PCM terminal 2AJ • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 9.
8	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [L8, LF].) • Is there any malfunction?	Yes	Replace the generator, then go to the next step. (See GENERATOR REMOVAL/INSTALLATION [L8, LF].)
8		No	Go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [L8, LF].) • Perform the KOER self test. (See KOEO/KOER SELF TEST [L8, LF].) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF].)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
10		No	DTC troubleshooting completed.