1998 Passat tdi 1.9

[jasonk]

Hi Lads a customer left me in a passat with no power, i pluged it in and came back wit a few different faults map sensor ect i fixed them all and cleared the codes drove the car came back still no power plugged it in and 01262 was back up again its the turbo wastegate valve i checked the power and only had 5.7 volts traced it back to a bad earth i now have 12 taught that was it sorted drove the car no different plugged it in and it was back again fitted a new valve cleared the fault again checked the switch earth from pin 15 in the ecu harness and i have 0volts when off 12.4 when on and 14.2 when engine running and when the valve operates i am ment to have 0-1volts but that isnt happening so im stumped now on whats causing this fault to keep popping up any help please

Regards Jason

[jasonk]

took off the turbo and its perfect done a vaccume test on the actuator ant its fine i really am at a dead end now

[Liteace]

put it all back together and drive it with boost gauge connected and see what the turbo is pumping out

[synkrotronic]

...and after if measurement is not correct,you could connect a vacuum gauge to confirm if valve work correct.

Regards

[odyseus7]

I had the same problem and i fix the ECU.

[synkrotronic]

I had the same problem and i fix the ECU.

Hi, what was wrong on ecu?
What did you do for repair it?

Thanks in advance

[jasonk]

...and after if measurement is not correct,you could connect a vacuum gauge to confirm if valve work correct.

Regards

Hi thanks it boosting grand and i done a test on the accuator for the waste gate this one dosen have veins in the turbo it has the wastegate and to move the wastegate you put pressure into this one unlike the veins one which
vaccume opens. intake manifold is clear egr is ok map is ok
maf is ok i am now thinking the ecu myself

[synkrotronic]

What pressure you see on gauge?

[jasonk]

i havin put a guage on it as the fella who works here has a loan of it but the pipes a good and hard on boost as normal there is no leaks and the wastegate is working this used to overboost and go into limp mode switch it off and on and go on again then maybe a week later same thing again but now there is no power at all............

Regards

[synkrotronic]

Sorry turbo pressure, you could confirm exaust gas circuit,could be damage closed,don?t know if you understand what i mean.
Normally if high pressure,i think car work good until 100km/h and after ecu detects error,go to emergency mode

Regards

[synkrotronic]

What maximum pressure you measure,running car? 700,900,1200 mB...

[givusaclue]

have you checked the wastegate operates?
i use a mityvac pump to pressure or vac. it & check the actuator arm moves open & closes all the way & smoothly
are you sure this isn't a variable vane turbo though?

[jasonk]

What maximum pressure you measure,running car? 700,900,1200 mB...

on the computer intake manifold pressure is 1384mb aqt 3000rpm

[jasonk]

have you checked the wastegate operates?
i use a mityvac pump to pressure or vac. it & check the actuator arm moves open & closes all the way & smoothly
are you sure this isn't a variable vane turbo though?

no its vane turbo has the accuator in the center of the two housings this is to the side and i had it apart too and its just wastegate flap moves free and put a small amount of air pressure to it and it operates free

[Ashraf6119]

Hi

Have you tried to clean the MAP Sensor and see if it helps.

Hope This Helps

Ash