EngineGenerator Noise Diagnosis
Generator Noise Diagnosis
Diagnostic Instructions
Diagnostic Aids
Noise from a generator may be due to electrical or mechanical
noise. Electrical noise or magnetic whine usually varies with the
electrical load placed on the generator and is a normal operating
characteristic of all generators. When diagnosing a noisy
generator, it is important to remember that loose or misaligned
components around the generator may transmit the noise into the
passenger compartment and that replacing the generator may not
solve the problem.
Circuit/System Testing
| 1. |
Start the engine. Verify the
noise can be heard. Compare the concern to a similar
vehicle. |
| 2. |
Perform a charging system
test. Verify that the generator is charging properly. Refer to
Charging System Test . |
| 3. |
Inspect the generator,
generator mounting, wiring harness, heater hoses, A/C lines, or
other accessory equipment that may be misrouted or be the cause of
noise being transmitted into the passenger compartment.
|
| 4. |
Ignition OFF, remove the
engine drive belt. Verify the generator, A/C compressor, water pump
pulley, power steering pump, idler pulley, and tensioner pulley
spin freely. |
| ⇒ |
If any of the pulleys do not spin freely, replace
the affected component. |
| 5. |
Start the engine, with the
drive belt removed. Verify that the noise goes away. Operate the
engine for no longer than 30-40 seconds. |
| ⇒ |
If the noise is still present, the generator is
not the cause of the noise. |
| 6. |
Loosen all generator mounting
bolts and ensure the generator is properly aligned. Tighten the
mounting bolts to specification, refer to
Generator Replacement . |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
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