DTC P2503


DTC P2503	No electricity from generator output voltage for signal
DETECTION CONDITION	• The PCM needs 20 A or more from the generator, and determines the generator output voltage is 8.5 V or less while the engine is running.
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 2AR • Open and/or short to ground in wiring from between generator terminal D and PCM terminal 2AN • Drive belt not properly adjusted


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE.) • Is the same DTC present?	Yes	Go to the next step.
1		No	Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING.)
2	INSPECT DRIVE BELT CONDITION • Verify that the drive belt auto tensioner indicator mark does not exceed the limit. • Is the front drive belt normal?	Yes	Go to the next step.
2		No	Replace and/or adjust the drive belt, then go to Step 9.
3	INSPECT PCM FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair the terminals, then go to Step 9.
3		No	Go to the next step.
4	INSPECT GENERATOR FOR POOR CONNECTION • Disconnect the generator connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the terminals, then go to Step 9.
4		No	Go to the next step.
5	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 9.
5		No	Go to the next step.
6	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 9.
6		No	Go to the next step.
7	INSPECT GENERATOR CONTROL FOR OPEN CIRCUIT • Measure the resistance between generator terminal D (wiring harness-side) and PCM terminal 2AN. • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for an open circuit, then go to Step 9.
8	INSPECT GENERATOR OUTPUT VOLTAGE MONITOR CIRCUIT FOR OPEN CIRCUIT • Measure the resistance between generator terminal P (wiring harness-side) and PCM terminal 2AR. • Is there continuity?	Yes	Repair or replace generator, then go to the next step.
8		No	Repair or replace the wiring harness for an open, then go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P2503 COMPLETED • Make sure to reconnect all connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform the KOER self-test. (See KOEO/KOER SELF-TEST.) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE.)
10		No	Troubleshooting completed.