Test N - Ignition Diagnostic Monitor (IDM): Notes

NOTE: Perform this test when Code 14, 18, 19, 28, 45, 46, 48 or 88 is displayed during QUICK TESTS or when directed here by other test procedure or driveability symptom. This test is intended to diagnose only the EEC-IV portion of the ignition system. For additional information on ignition system and component testing, see SYSTEM/COMPONENT TESTS article.

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

TFI or DIS ignition module
Ignition coil or DIS coil packs
Spark plugs and/or high tension cables
Distributor and PIP sensor
Secondary ignition component arcing
NOTE: This test is intended to diagnose the following circuits and components.
Harness circuits (IGN GND, SPOUT, PIP, IDM, DPI & SAW)
ECA assembly

Fig 1: All TFI Applications

TEST PIN WIRE COLOR IDENTIFICATION

Application (Test Pin No.)	Wire Color
Pin 4, IDM	Dark Green/Yellow
Pin 16, IGN GND	Black/Orange
Pin 36, SPOUT/SAW	Yellow/Light Green
Pin 56, PIP	Dark Blue

There are 4 types of ignition system connections used with EEC-IV. They are configured as follows: