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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P0650: Malfunction Indicator Light Control Circuit >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use Connector Test Adapter Kit (J-35616-A) for any test that requires probing the PCM harness connectors, electrical center fuse/relay cavities, component terminals and component harness connector. Using this kit will prevent damage caused by improper probing of connector terminals.

MIL is actually a Light Emitting Diode (LED). A LED requires a parallel dropping resistor to operate on a 12-volt system. If LED burns out, the dropping resistor will still pass voltage on to the PCM, and the DTC P0650 may not set even though the MIL is inoperative. If the power supply circuit to the indicator lights and the MIL control circuit check out okay, the IPC needs to be checked for a faulty LED. See INSTRUMENT CLUSTER DIAGNOSTIC SYSTEM CHECK in appropriate ANALOG INSTRUMENT PANELS article.

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