David Chamberlain posted this in the prior thread;


dchamberlain

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Location: Lake County, Oregon
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MAP, EGR, EBP, APP and ICP sensors all giving codes. Each one of those sensors rely on VREF (conditioned, regulated +5V from the PCM).

I'd bet that you have a shorted VREF wire somewhere. How to test that and find it, I haven't a clue. One of the smart techs will have to help you with that.
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David Chamberlain
2004 F-250 SD, 4x4 FX4, 6.0L PSD

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