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**octaneman** · 06-25-2009, 11:57 AM

On the ignition module harness that connects to the module there should be an orange/tan wire, this wire is signal ground to the ECM. Connect a test light on the wire by doing in/out motion on the wire pin( harness connected ignition on) with a spark tester on the coils. By doing the in/out motion the test light acts as a signal pulse, if there is a spark from the coil the ECM is bad.

06-25-2009, 11:57 AM	#4 (permalink)
octaneman Mentor Home Support, Gearhead Automotive Center Join Date: May 2009 Posts: 549 OS: WINXP	Re: 1989 Chevy Cavalier Z24 2.8L Won't start On the ignition module harness that connects to the module there should be an orange/tan wire, this wire is signal ground to the ECM. Connect a test light on the wire by doing in/out motion on the wire pin( harness connected ignition on) with a spark tester on the coils. By doing the in/out motion the test light acts as a signal pulse, if there is a spark from the coil the ECM is bad.