Why is the PCM not working on the coil pack?
Why is the PCM not working on the coil pack? PCM (Powertrain Control Module=Fuel Injection Computer) is not providing any of the Switching signals to the individual ignition coils within the coil pack because the crankshaft position sensor has failed. You're starting point for the rest of your tests will be TEST 3. Why is no spark coming out of coil pack? CASE 1: If the test light lights up. This result lets you know that the coil pack is receiving power and that the power circuit requires no further testing. If you Ford (or Mercury) car or truck still...