Here's a schematic of an ICM, when you pull the EST wire, the pickup coil is routed straight to the ignition coil (through the signal converter) which sends pulses to the plugs. If it doesn't work when connected, you may have bad wiring going to/from the ECM or, your ICM is bad. Check continuity from terminals on the ICM to the ECM as per schematic.
Yes, you can have a bad one from the factory, it's not unheard of. If it's a bad ICM, your coil may have taken it out.
Yes, you can have a bad one from the factory, it's not unheard of. If it's a bad ICM, your coil may have taken it out.
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