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MALFUNCTION INDICATOR LAMP (MIL) INOPERATIVE Circuit Description Voltage is supplied directly to the malfunction indicator lamp (MIL). The powertrain control module (PCM) MIL Operation The MIL is located on the instrument panel cluster (IPC). MIL Function z The MIL informs the driver that a malfunction has occurred and the vehicle should be taken in for service z The MIL illuminates during a bulb test and a system test. procedures. Additional z Visually and physically inspect the vacuum hoses for splits, kinks, and proper z Inspect the intake manifold and the exhaust manifold passages for casting flash. z Inspect the transmission torque converter clutch (TCC) operation. The scan tool z Inspect the exhaust system for possible restrictions. Inspect the following: { Inspect the exhaust system for damaged or collapsed pipes. { Inspect the mufflers for heat distress or possible internal failure. { Inspect for possible plugged catalytic converters. Refer to Restricted z Electromagnetic interference (EMI) on the reference circuit can cause an engine z Inspect the park/neutral position (PNP) switch operation. Refer to Park/Neutral z Inspect for faulty motor mounts. Refer to Engine Mount Inspection in Engine z Inspect the intake manifold and the exhaust manifold passages for casting flash
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls (Troubleshooting) - 4.8L, 5.3L, and 6.0L - Hummer H2
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