Cutlass Supreme RWD V8-307 5.0L (1988)
6.
Test light should be "OFF", as ILC quad-driver should be turned "OFF".
7.
If the test light goes out, the ECM has to be replaced, as the quad-driver inside the ECM has failed.
Oldsmobile Workshop Service and Repair Manuals
Idle Speed/Throttle Actuator - Mechanical >
< Engine Controls - Updated Idle Load Compensator Chart|Page 1677
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