Each ignition primary circuit is continuously monitored. The test fails when the powertrain control module (PCM) does not receive a valid ignition diagnostic monitor (IDM) pulse signal from the ignition module (integrated in the PCM).
Open or short in the Ignition START/RUN circuit
Open coil driver circuit
Coil driver circuit shorted to ground
Coil driver circuit shorted to VPWR
Use the 12-volt non-powered test lamp to verify START/RUN voltage at the ignition coil harness connector.
Check the coil driver circuit for open, short to VPWR, or short to ground.
Key On Engine Off
Key On Engine Running
GO to Pinpoint Test JE.
Coil Driver (CD)
F-150, Mark LT
Here's the info on your DTC. You can move the COP to a different cylinder to see if it follows. If it does, then it's probably the coil. If not, there are other things you will need to troubleshoot. The list is a little long as is the troubleshooting procedure. But that's where I would start, move the COP to different cylinder. Let us know what happens...
PhuturePrimitive, Crystal Method, Thievery Corporation, Kaya Project, Leftfield
What's this, then? 'Romanes Eunt Domus'? 'People called Romanes they go the house'?
Last edited by wildcard30; 07-22-2007 at 03:47 PM.
Thank you for your help wildcard30. I changed out the # 4 COP to the # 1 position. I went to a different autoparts store and had a guy read the codes. It showed all the COPS 1-4 were bad. (yeah the girl at the first autoparts store didnt know to press the down button to get more codes) So I went back home and did some more searching. Come to find out the wiring harness that controls the COPS was damaged. My local dealer has installed a new harness. Again thanks for the help.
Rodent damage. Must have happened in the winter months. I can't imagine a rat or squirrel wanting to climb up next to a hot engine in July??? The truck is parked outside and we do live in the woods. I leave it at our barn for several hours at a time so who knows. Never thought I would say I had a rat eat a wiring harness though.
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