Diagnostic Aids

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.

Check for a faulty light bulb or open in Red wire circuit. Check if 5-volt reference signal for MAP sensor is shorted to ground. If engine cranks, but will not run, check battery feed circuit, EFI main relay, ignition circuit and for poor ECM connections.

Fig 1: Chart A-1 Schematic (GSi), No CHECK ENGINE Light

Fig 2: Chart A-1 Flow Chart (GSi), No CHECK ENGINE Light