Good ICM, do you mean EDIS module?
The '94 4.0l will use an EDIS-6 module for spark control, CKP sensor wires run to this module, and the coil pack Ground wires come from this module.
On my '94 the EDIS module is located near the battery but on the Front side of the rad support, you can see it by looking up under the bumper, about a 4" square black box with a large wire connector.
The EDIS is the spark system brain, it can run the spark without the computer.
The CKP sensor starts the ball rolling, without an initial pulse from the CKP to the EDIS there is no spark started, and the EDIS sends this pulse to the PCM(computer) which starts the fuel injection system.
Just as a general test to see if coil pack is being grounded by EDIS module, hook up a test light to "+" on battery and to one of the 3 ground wires on the coil pack, unplug the wire from coil pack, crank engine, test light should flash on and off as EDIS grounds and cuts ground to coil.
If no flashing then either EDIS is the issue or CKP.......or wiring between CKP, EDIS or coil
Thats the FOUR parts for spark, fourth being the wiring, lol
Last edited by RonD; 07-20-2014 at 11:20 AM.