Did you ever get to the bottom of this one as i have the exact same fault with a 04 vivaro dci.Its had the throttle pedal replaced and all the wiring from it checked and wired direct.Even if we simulate a voltage direct to track 2 at the ecu the voltage still intermittently drops to zero on the tech 2.Also we swapped the ecu from another van and we still have the drop out.Any advise from anyone would be greatly appreciated.Cheers Mick.
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