c250td sport wiring diagram (engine)

[Uberderv]

Hi,
I am looking for the wiring diagram for the above engine, I would like the EGR/boost control circuit back to the ECU if any one would be kind enough to share it with me.

thanks in advance, peter.

 

[Alex Crow]

Any particular reason why?

 

[Uberderv]

My EPC light is on and I am convinced its the turbo control vacuum solenoid. My plan is to use the EGR solenoid as I have disabled it.

Instead of splicing into the wires I would like to swap the EGR/boost control at the ecu connector then just make new vac lines.

 

[Alex Crow]

Firstly I would ask what fault codes you have, guessing without them is rarely fruitful.

Next point would be that the EGR and turbo transducers are different types on this car, are they not?

Will now look up the wiring now....

 

[Alex Crow]

EGR vacuum valve is Grey/White at pin 35 at ECU, this is switched earth with live (Black/Red) supplied to valve through fuse no.2 at the k40/4 module.


Turbo tranducer is same live feed and Grey/Brown modulated earth at pin 53 at the ECU.

 

[Alex Crow]

According to the wiring chart, the EGR valve is an on/off solenoid as I suspected.
This cannot be used in the same way as a transducer, which modulates the vacuum with a PWM signal.

 

[Uberderv]

Thanks Alex that's very helpful, do you know the voltage range for the turbo solenoid?
Cheers Pete.

 

[Uberderv]

Oh not read the codes but planning on it when I get hold of some dosh. The fault is intermittent and can last a few days. From what I have read there are only three sensors that will put it in limp mode and the others appear to be ok.

 

[Uberderv]

Hi, thanks for the info. Does your chart tell you if the solenoid is:
maximum OCR- Maximum vac (5v)
minimum OCR- No vac?

I have a couple of vac control solenoids which might work as they are controlled via the earth pin on the ECU.

Thanks Pete.

 

[Alex Crow]

Pete, a vac control solenoid will not work, you need a vacuum modulating valve (aka vacuum transducer) that can deliver variable amounts of vacuum. Vacuum solenoids are on or off.

These transducers are controlled by PWM, not variable vaoltage, and the voltage feed is 12v.

 

[Uberderv]

Doh!!! That puts an end to that sketchy plan. Strangley the EPC light has been off since I started this thread, I removed the vac line to the transducer and gave it a blow/suck which seems to clear the fault for a few days.

Are these valves serviceable in any way?