Pinpoint Test F: The Generator is Noisy

Pinpoint Test

Pinpoint Test F: The Generator is Noisy

Refer to Wiring Diagram Set 12, Charging System for schematic and connector information. Diagrams By Number

Normal Operation

The generator is belt-driven by the engine accessory drive system. There are several sources of generator noise which include bearing noise, electrical fault noise, generator or belt pulley misalignment. A generator with certain types of diode or stator failures may also produce an audible noise.

This pinpoint test is intended to diagnose the following:
- Front End Accessory Drive (FEAD) belt
- Loose bolts/brackets
- Generator/pulley

PINPOINT TEST F: THE GENERATOR IS NOISY

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F1 CHECK FOR ACCESSORY DRIVE BELT NOISE AND LOOSE MOUNTING BRACKETS

- Ignition OFF.
- Check the accessory drive belt and tensioner for damage and correct installation. Refer to Accessory Drive Component Tests and General Diagnostics.
- Check the accessory mounting brackets and generator pulley for looseness or misalignment.
- Is the accessory drive OK?

Yes
GO to F2.

No
REPAIR as necessary. REFER to Accessory Drive [1][2]Diagrams for diagnosis and testing of the accessory drive system. TEST the system for normal operation.

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F2 CHECK THE GENERATOR MOUNTING

- Check the generator mounting for loose bolts or misalignment.
- Is the generator mounted correctly?

Yes
GO to F3.

No
REPAIR as necessary. TEST the system for normal operation.

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F3 CHECK THE GENERATOR FOR NOISE

- With the engine running, use a stethoscope or equivalent listening device to probe the generator and the accessory drive area for unusual mechanical noise.
- Is the generator the noise source?

Yes
INSTALL a new generator. REFER to Generator - 3.5L GTDI Service and Repair, Generator - 3.7L Service and Repair, Generator - 5.0L Service and Repair or Generator - 6.2L Service and Repair.

No
REFER to Engine System - General Information Testing and Inspection to diagnose the source of the engine noise.

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