fastpakr
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V8 Engine Swap
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- Joined
- Aug 6, 2007
- Messages
- 8,016
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- Location
- Roanoke, VA
- Vehicle Year
- 1999
- Make / Model
- Ford
- Engine Type
- V8
- Engine Size
- 5.0
- Transmission
- Automatic
- 2WD / 4WD
- 4WD
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- 285/75-16
I finally started troubleshooting my '94 2.3 a little bit tonight. It's been throwing a CEL since I bought it. Can't run KOER codes because it goes into FMEM immediately (although after a clear it will pass KOEO). Stored codes are 223 (Loss of Dual Plug Inhibit Control) and 224 (PCM detected coil 1,2,3,4 primary circuit failure). Primary visible symptom is a half rate tachometer. When I first bought it I diagnosed a failed coil pack (and had it tested before replacing), but that repair did not resolve the issue.
Tonight I verified power to both coils from the ICM/DIS module. Also traced continuity from each of the four coil signal wires back to the ICM - no problems there. When those tested good, I verified continuity from the PIP and DPI pins at the ignition module back to the ECU. No problems there either.
Since the truck runs, I assume it's safe to trust that the other wiring to the ignition module is good (seems that it would keep the system from working at all?). Based on this, I'm ready to replace the ignition module. Can anybody back me up on this diagnosis or point me towards something else that should be checked first? I've got the Mitchell manual for my truck, but the troubleshooting steps for this issue are written based on using several pieces of diagnostic gear I don't possess. Any pointers from those with experience here would be greatly appreciated.
Tonight I verified power to both coils from the ICM/DIS module. Also traced continuity from each of the four coil signal wires back to the ICM - no problems there. When those tested good, I verified continuity from the PIP and DPI pins at the ignition module back to the ECU. No problems there either.
Since the truck runs, I assume it's safe to trust that the other wiring to the ignition module is good (seems that it would keep the system from working at all?). Based on this, I'm ready to replace the ignition module. Can anybody back me up on this diagnosis or point me towards something else that should be checked first? I've got the Mitchell manual for my truck, but the troubleshooting steps for this issue are written based on using several pieces of diagnostic gear I don't possess. Any pointers from those with experience here would be greatly appreciated.