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Message: [QUOTE="6.0 Tech, post: 1432661, member: 23001"] Nice truck man. Re reading thru everything, you have a manually measured 5.0v at the vref pin on the icp. Is this to battery ground, or signal return, which would be the top right pin on the icp? I am leaning towards a shorted sensor or harness somewhere pulling your vref down. Did you unplug the app (throttle pedal), and baro? The baro is behind the drivers knee panel, it will be a 3 wire sensor that looks like it has a cap on the end of it. You could also have an open signal wire between the pcm and the single pin on the icp. Start by checking all 3 pins for short to ground, and each other. Continuity to both ground and each other should be open circuit. Make sure this is done with the pcm unplugged. Also double check that all the wires have good continuity to the pcm. Were talking like .5 ohms or less here. [/QUOTE]

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