Hope someone can help.
Bit of a long one as I've tried diagnosing and included that below. I've now run-out of diagnostics I can think of. I think its also slightly strange how its occurred.
Car works perfectly, been for a good drive a few days before, I then washed the car. nothing different. The next day I went to start the car, car starts as normal but get an EML light. Check with Scan gauge and get P1275 which is Acc Pedal sensor circuit 1 and P1635 which is 5v reference circuit.
I check both LOD connectors and visible wires along with ECU plugs and pedal plug, all good, clean and dry no breaks etc, I spray ACF50 in the sockets just to be sure. Try again and still the same codes, I can clear the codes but the engine nearly dies when done whilst running and the codes come straight back. I can confirm using the pedal does nothing.
As the codes are pedal related, I checked the voltage at the pedal I determine that wires 2 (grn) and 5 (wht) are the reference voltages and should be 5v, (let me know if this is wrong) Wire 5 gets 5v, wire 2 get just under 2v. So wire 2 is the reference voltage for circuit 1, (again let me know if incorrect).
I de-pin wire 2 from the black LOD plug, I get just under 2v. Before stripping this wire out back to the ECU I check the voltage at the ECU by carefully dismantling the ECU plug and checking straight off the ECU plug pin, I get 2v. I can't check directly on the ECU pin as I can't see an easy way of de-pinning.
Has anyone any suggestions on what else I can check? Can't see on the wiring diagrams anything that's linked, but suppose the ECU might be looking for something from elsewhere.
I can't think how a working car that has only been washed does this when the wiring is not damaged or has water ingress.