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The ICP wiring connects to the ICP sensor and the PCM. A common area for wiring concerns is at the left valve cover where the engine harness droops down over the valve cover to the fender well. The harness has been known to chafe on the valve cover.
When the PCM loses the ICP signal it uses an "inferred" signal.
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Ford Master Diesel Technician 
Diesel Technician Society
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