Hi all
Just had a vauxhall Corsa van 1.3 cdti in and customer says van is loosing power and going into limp mode somtimes and seems like the car is not boosting.
I pulled the codes out using Autoboss v30, The DTC said: P0108 - 7 undefined trouble code.
Live data said Barometric pressure 99 kpa and volts said 3.7 this data stayed the same on idle, throttle,and with just key on position!
Boost pressure 94 kpa and 1.76 v on idle, Boost pressure reading were up under load.
The customer has fitted new egr valve, map sensor and maf meter.
Could this be due to wastegate not opening and ECU shutting down? Any help forward would be appriciated
What should the pressure be in the inlet manifold?
I hooked the scope up to the map sensor and this is what the reading was:
My scanner was saying 3.7v all the time but on the scope it is reading about 1.8 v at idle so would you agree the scope was right and my scanner reading wrong?
I would trust my picoscope if i were you.
I have managed to find the right specifications on this map sensor Bosch # 0281002844 - that will say how the scale are.
There must be something else wrong since the map sensor already is replaced - i am tempted to say - that the turbo filled with large amount of carbon deposit !
There was no codes stored for overboosting, Im going to hook the scope up again for map , maf and throttle position sensor and add file for viewing tomorrow evening.
I know these engines are bad for carbon build up and reckon on the turbo or actuator but really want to make correct diagnostic for customer.
Customer did say egr had a lot of carbon build up on it!
What make is the map sensor fitted?
I've had experiences with poor non gen maps before. Have you tested the full circuit ie powers and ground and sensor signal integrity etc.
The circuit should be a pull down design ie 5v when unplugged if I remember right. If that's the only code you have and no boost deviation ones then I'd be focusing there first.
Although did you say a motor factors maf was fitted?
Also the inlet manifold are prone for blocking up as well as the valves with carbon buildup on really high mileage engines.