Hi I am desperate for some help with my car. I had p0505 (idle control voltage high) logged in the ecu after mil came on car not idling correctly and losing power ,Changed the throttle body but this did nothing to cure the fault .I then sent the ecu off for test where they found a fault on the 5v side repaired and sent back.I had the ecu refitted back to the car but the fault has returned .Having put opcom on to read the data Iwas wondering if the voltages at the idle control valve are right.The throttle control sens reads 4.0v T.p.S 4.4v tps servo signal 5%.
coolant temp 4.5v in air temp2.7v maf 1.1v mafsens 18.0kgh
egr 0% egr feedback 0.9v. I would be very grateful if anyone could point me in the right direction and possible causes .
Astra coupe 1.8 x18xe1 engine