NB - 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.


- DIS ignition module

- DIS coil pack(s)

- Spark plugs and high tension cables

- Crankshaft sensor.

- Camshaft sensor, if equipped.

- Arcing of secondary ignition components


This Pinpoint Test is intended to diagnose only the following:


- Harness Circuits: IDM, DPI, SAW

- Processor assembly


DESCRIPTION

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