I don't believe the manufacturer recommends using a 12 volt testlite, for testing a circuit that goes to the computer, but, as long as the applied voltage is battery voltage, I have used the 12 volt lite.
You might disable the fuel system when cranking.
If there is no pulse on the suspect circuit, I'd take the proper connector loose form the computer and the coil pack, test for continuity on that circuit. If there is no continuity, either the wire is broken or a problem with the connector. While testing you might wiggle the harness and connectors. While doing that testing, you might take the negative battery cable loose, first. The computer should be on the driver side of the battery, under the hood.
If all tests lead you back to the computer, you should have somebody, at least put a scanner on it, try to make sure before replacing anything.
Thursday, January 15th, 2009 AT 12:32 PM