Hi everyone
Have this Polo in at moment from breakdown job vehicle in limp home with MIL and EPC lights on, Fault code (P1639 Accelerator pedal sensor 1/2 signal improbable) Fault will not clear, actual values show (at closed throttle) sensor 1 16%, sensor 2 41%.
Scope traces for both sensors tested at ecu look good one sensor switching from 0.4v - 1.8v and the other from 0.7v - 3.8v, however i have no tech data to relate these values to? Circuit tests ok volt drop, resistance etc.
I came back to car this morning connected kts and tried to clear fault, which it did, then on checking actual values both pedal sensors reading 16% and increasing within 1 or 2% of each other, Start vehicle and it ran fine for 5 or 10 mins then i noticed sensor 2 had resorted to reading 41% not 16%,fault code returned and lack of response, Rescoped signals at ecu and both looked the same as before with same voltage readings.
I'm suspecting ECU fault but just wondered if anyone else had experienced similar fault with this model.
Cheers
Simon