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Wiring Diagram:

CIRCUIT DESCRIPTION

There are several vehicle grounds that are essential for proper powertrain system operation. Loose or poor ground connections may cause widely varying problems, from flickering telltales to PCM DTCs to driveability problems. The PCM Power and Ground Check (2 of 2) should be performed when referred to by other diagnostics or when erratic or intermittent problems defy traditional diagnosis. The PCM Power and Ground Check (2 of 2) chart lists these grounds and other pertinent information that will allow you to investigate a possible loose or faulty ground connection.

DIAGNOSTIC AIDS

Check the grounds listed in the Powertrain Ground Check table for the following conditions:
^ Corrosion or paint between the ring terminal and the grounding surface.
^ Poor quality crimp of the ring terminal to the ground wire.
^ damaged ground wire.