citroen c4

**radiosolutions** · 20th September, 2012, 04:22 PM

55 reg, 1.4 petrol, problem is on startup revs stop at 1500rpm. plugged in diag, faults are map sensor, in live data shows 0, changed map still the same, done pinouts to ecu all wiring fine. i have checked voltage at map sensor according to autodata. it says there is a 5v, gnd, 4v. i am missing the 4v so i suspect ecu fault, can i use second hand ecu or does it have to be new, numbers on it : iaw 6lp2.05. thanks

**apolo2100** · 20th September, 2012, 05:02 PM

yes you can use another used ECU and immobilizer swap file, that has a central processor st10 vc copies banks 1 and 2 for the immobilizer

**mohamedkey** · 20th September, 2012, 05:20 PM

x prog m red flash st10f good.

**radiosolutions** · 20th September, 2012, 06:54 PM

i have a xprog m, do you have a wiring diagram of were i have to solder to to read st processor. thanks

**Ashraf6119** · 20th September, 2012, 08:25 PM

Hi

Have you checked if there is no any leak in Intake System...

**obdmaster** · 20th September, 2012, 10:09 PM

Originally Posted by radiosolutions

55 reg, 1.4 petrol, problem is on startup revs stop at 1500rpm. plugged in diag, faults are map sensor, in live data shows 0, changed map still the same, done pinouts to ecu all wiring fine. i have checked voltage at map sensor according to autodata. it says there is a 5v, gnd, 4v. i am missing the 4v so i suspect ecu fault, can i use second hand ecu or does it have to be new, numbers on it : iaw 6lp2.05. thanks

Id image the 4v is a signal from map sensor to ecu???,

So replacing ecu, wont fix, as youve changed map sensor, check for air leaks as ashraf says. if all good cut wire coming out of map sensor and test voltage again, as wire to ecu may be down to ground in loom????

**apolo2100** · 20th September, 2012, 10:25 PM

I have a link that you need the files and calls me on msn I'll step coordinates
mario hugs

no addys

**radiosolutions** · 21st September, 2012, 08:22 PM

a bit of feedback, i disconnect camshaft sensor and voltage then was right at map sensor, 5v, 4v, gnd. problem was the camshaft sensor, its on the same line as the map sensor 5v. it was shorting out therefore bringing the voltage down on map sensor. the camshaft sensor is located behind air filter box coming off throttle body. thanks for all help.