Chart A-1, No Check Engine Light: Notes

WARNING: This page is about a different car, the 1992 Geo Prizm. However, it is still accessible from the selected car via links, so may be relevant.

With ignition switch in the ON position and engine off, CHECK ENGINE light should always be on. ECM controls the CHECK ENGINE light by completing bulb ground circuit.

NOTE: Test numbers refer to test numbers on diagnostic chart.

An open GAUGE fuse could indicate a short to ground in GAUGE fuse circuit.
This indicates a ground path through ECM.