Specifications

ON-BOARD DIAGNOSTIC
F179
F
Diagnostic procedure
STEP INSPECTION ACTION
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
2 INSPECT POOR CONNECTION OF
GENERATOR CONNECTOR
• Turn ignition key to OFF.
• 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 7.
No Go to next step.
3 CLASSIFY GENERATOR MALFUNCTION OR
OTHER MALFUNCTION
• Turn ignition key to ON (Engine OFF).
• Measure voltage between generator terminal D
(harness-side) and body ground.
• Is voltage B+?
Yes Go to next step.
No Malfunction at generator.
Go to Step 6.
4 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 or replace pins, then go to Step 7.
No Go to next step.
5 INSPECT GENERATOR CONTROL CIRCUIT
FOR SHORT TO POWER
• Turn ignition key to ON (engine OFF).
• Measure voltage between generator terminal D
(harness-side) and body ground.
• Is voltage B+?
Yes Repair or replace harness for short to power, then go to
Step 7.
No Go to Step 7.
DTC P2504 Battery overcharge