Happy New Year to everyone.
I'm wrestling with a Vivaro 1.9 DTi, 52 plate. EML light comes on, vehicle goes into limp mode. Fault code P180B, APP2 circuit fault, intermittent, is logged in the ECU. Using Autodiagnos unit, go to default list, with throttle closed, APP1 is 0.72v, APP2 is 0.35/6v but briefly dips to zero then back to 0.35/6. This happens in any throttle position i.e whatever the voltage it dips to zero and back. It has had an new throttle pot. If I put a scope on the 2 signal wires out of the TP both traces are smooth and hash free and the APP2 trace is constant (apart from a regular 0.1v pulse), there is no sign of the voltage dropping away and returning. Autodata do not give ECU pin numbers for the Vivaro (or the Trafic) or much else for that matter.
Any ideas anyone.