Pinpoint Test G: The Generator Is Noisy

Pinpoint Test






Pinpoint Test G: The Generator is Noisy

Normal Operation

The generator is belt-driven by the engine accessory drive system.

This pinpoint test is intended to diagnose the following:
- Accessory drive belt
- Loose bolts/brackets
- Generator/pulley

PINPOINT TEST G: THE GENERATOR IS NOISY

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G1 CHECK FOR ACCESSORY DRIVE BELT NOISE AND LOOSE MOUNTING BRACKETS

- Ignition OFF.
- Check the accessory drive belt for damage and incorrect installation. Refer to Accessory Drive Testing and Inspection.
- Check the accessory mounting brackets and generator pulley for looseness or misalignment.
- Is the accessory drive OK?

Yes
GO to G2.

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

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G2 CHECK THE GENERATOR FOR EXCESSIVE ELECTRICAL NOISE

- Disconnect: Generator C102B for 2.3L or C102C for 4.0L.
- Start the engine.
- With the engine running, determine if the generator is still noisy.
- Is the noise still present?

Yes
GO to G3.

No
INSTALL a new generator. REFER to Generator - 2.3L Service and Repair or Generator - 4.0L SOHC Service and Repair. TEST the system for normal operation.

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G3 CHECK THE GENERATOR FOR MECHANICAL NOISE

- Turn all of the accessories off. With the engine running, use a stethoscope or equivalent listening device to probe the generator for unusual mechanical noise.
- Is the generator the noise source?

Yes
INSTALL a new generator. REFER to Generator - 2.3L Service and Repair or Generator - 4.0L SOHC Service and Repair. TEST the system for normal operation.

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

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