No ICP readings plugged in (with known good ICP) - Ford Powerstroke Diesel Forum
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Old 07-13-2011, 07:43 PM
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No ICP readings plugged in (with known good ICP)

Here we go..... Swapped engines, dashes, harnesses from a 94.5 to a 96. The 96 motor that we put into the 94.5 is running great. Just finished the install on the 96 (94.5 engine). It cranks and cranks and nothing.

First, when the motors were out of the trucks, they both got new injector orings, oil cooler orings/gaskets, dipstick tube re-seal. We have new batteries, fresh oil and filter, good fuel.

Here is what we did...

Crank...no start. no injectors clicking. just turning over.

Hooked up the AE. P1280 and P0344. The P0344 is from extended cranking (I think). The 1280 is ICP low. Run system test. All good. Cleared codes. Brought up the ICP and HPOP (called something else on AE). ICP read 0 the HPOP read 0 with key on and while cranking. So, we unplugged the ICP and immediately got some pressures. Hpop was a little over 2000psi and the ICP was in red and a hundred something. RPM was right around 100 and as the batts were dying, it dropped to 85. My first thought was the ICP sensor is bad. So we swapped it with a known good one with the same results. We are getting the batts charged tomorrow and replacing the starter.

What would cause the ICP reading to null or short when it is plugged in?

In case anyone is wondering, HPOP reservoir is full, good fuel pressure, UVCH are new along with pigtails, CPS was replaced, injector buzz test successful. Guess I just need to look over the harness really good.
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Old 07-17-2011, 05:31 AM
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Well, just in case someone else has the same problem..... It was the wiring harness. Picked one up from a salvage yard. Replaced the uvch connectors and all is good now. I haven't tore apart the harness yet to see what was bad. I will do that eventually and post results.
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