NA - Testing Notes

NOTE: You should enter this Pinpoint Test only when you have been directed here from Quick Test or Ignition System.


REMEMBER


To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault.


- TFI

- Ignition coil

- Spark plugs and high tension cables

- Distributor

- Arcing of secondary ignition components


This Pinpoint Test is intended to diagnose only the following:


- Harness circuits: IDM

- Processor assembly



DESCRIPTION



The Ignition Diagnostic Monitor is an input to the processor that verifies spark function based on the flyback voltage created by the ignition coil primary discharge, otherwise known as TACH. This signal is transmitted from the TFI module to the processor. The IDM signal consists of a single pulse for each successful ignition event. Lack of an indication of intermittent and/or missing spark events.