P065A- GENERATOR PERFORMANCE

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the engine running.
Set Condition:
The ECM detects that the Generator output is not within specifications.

Possible Causes

GENERATOR BELT

GENERATOR BELT TENSIONER

GENERATOR B+ CIRCUIT OPEN

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Diagnostic Test

1. CHECK FOR OTHER DTC'S

Turn the ignition on.
With the scan tool, check the ECM for LIN Bus or System Voltage related DTC's.

Are there any LIN Bus or System Voltage related DTCs?

Yes

Repair other DTCs before continuing.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

Go To2

2. GENERATOR B+ CIRCUIT

Turn the ignition off.
Using a test light connected to ground, probe the B+ circuit at the generator.

Does the test tight illuminate brightly?

Continue

Go To 3

No

Repair the Generator B+ circuit for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

3. CHECK GENERATOR DRIVE BELT

Visually inspect the generator drive belt for glazing, cracks and other problems.
Inspect the generator drive belt and tensioner for proper tension.

Were any problems found?

Yes

Repair or replace as necessary.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

Go To 4

4. TEST DRIVE THE VEHICLE

Turn the ignition on.
With the scan tool, erase DTC's.
Test drive the vehicle.
With the scan tool, read DTC's.

Does the scan tool display this DTC?

Yes

Replace the Generator.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)