Specifications

F178
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P2504
A6E397001083W10
3 INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there a malfunction?
Yes Repair terminals, then go to Step 9.
No Go to next step.
4 INSPECT POOR CONNECTION OF
GENERATOR CONNECTOR
• Disconnect generator connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there a malfunction?
Yes Repair or replace terminals, then go to Step 9.
No Go to next step.
5 INSPECT GENERATOR CONTROL CIRCUIT
FOR SHORT TO GROUND
• Inspect for continuity between generator
terminal D (harness-side) and body ground.
• Is there continuity?
Yes Repair or replace harness for short to ground, then go to
Step 9.
No Go to next step.
6 INSPECT GENERATOR OUTPUT VOLTAGE
MONITOR CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between generator
terminal P (harness-side) and body ground.
• Is there continuity?
Yes Repair or replace harness for short to ground, then go to
Step 9.
No Go to next step.
7 INSPECT GENERATOR CONTROL CIRCUIT
FOR OPEN
• Measure resistance between generator
terminal D (harness-side) and PCM terminal
1AD (harness-side).
• Is there continuity?
Yes Go to next step.
No Repair or replace harness for open circuit, then go to Step
9.
8 INSPECT GENERATOR OUTPUT VOLTAGE
MONITOR CIRCUIT FOR OPEN CIRCUIT
• Measure resistance between generator
terminal P (harness-side) and PCM terminal
1AA (harness-side).
• Is there continuity?
Yes Repair or replace generator, then go to next step.
No Repair or replace harness for open, then go to next step.
9 VERIFY TROUBLESHOOTING OF DTC P2503
COMPLETED
• Make sure to reconnect all connectors.
• Clear DTC from PCM memory using WDS or
equivalent.
• Perform KOER self-test.
(See F66 KOEO/KOER SELF-TEST.)
• Is the same DTC present?
Yes Replace PCM, then go to next step.
(See F43 PCM REMOVAL/INSTALLATION.)
No Go to next step.
10 VERIFY AFTER REPAIR PROCEDURE
• Perform After Repair Procedure.
(See F66 AFTER REPAIR PROCEDURE.)
• Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See F67 DTC TABLE.)
No Troubleshooting completed.
STEP INSPECTION ACTION
DTC P2504 Battery overcharge
DETECTION
CONDITION
• PCM judges generator output voltage is above 18.5 V or battery voltage is above 16.0 V during engine
running.
POSSIBLE
CAUSE
• Short to power circuit between generator connector terminal D and PCM connector terminal 1AD
• Generator malfunction
• PCM and/or generator are poorly connected.