Ford Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose).
Check for 5 volt reference voltage to the Brown/White wire at any of the 3-wire sensors, MAP and ICP are 2 to check at. If the 5 volts is there with the key on then replace the PCM. If there is not 5 volts then we need to unplug all sensors getting 5 volts to see if one sensor is to blame. If the 5 volts never shows up then we need to cut this wire out of the PCM. If its still not there then we need to confirm all PCM powers and grounds are good. If so then the PCM is bad.
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So I assume the first part of the test failed, you do not have 5 volts to the MAP or ICP with the key on?
Hello again Chris here,
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Let me help some more. Is there anything else you feel I could offer so you would be pleased with my help. I have the option to call you if that would be better.