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GENERATOR NOISE DIAGNOSIS Diagnostic Aids Noise from a generator may be due to electrical or mechanical noise. Electrical noise (magnetic whine) usually Generator Noise Diagnosis 4 Operate the system in order to verify the System OK Go to Step 2 Step Action Yes No 1 Test the generator for proper operation using the Generator Tester. Refer to Go to Step 2 Go to Step 11 2 1. Start the engine. Verify that the noise can be heard. 2. Turn OFF the engine. 3. Disconnect the 4-way connector from the generator. 4. Start the engine. 5. Listen for the noise. Has the noise stopped? Go to Step 11 Go to Step 3 3 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in IMPORTANT: The replacement PCM must be programmed. Go to Step 4 Go to Step 11 4 Inspect the generator for a loose pulley and/or pulley nut. Go to Step 11 Go to Step 5 5 1. Loosen all of the generator mounting bolts. 2. Tighten the generator mounting bolts to specifications and in the proper sequence (if necessary). Refer to Generator Replacement . 3. Install the drive belt. Refer to Drive Belt Replacement - Accessory in Engine Mechanical. 4. Start the engine. Has the noise decreased or stopped? System OK Go to Step 6 Inspect the generator for the following conditions:
2004 Hummer H2 2004 ELECTRICAL Engine Electrical - Hummer H2
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