P0243 help help 2.7 crd

[JoeTe]

If you changed the turbo the new one wasnt setup correctly(pretty normal although never should happen). For do it correctly you have to remove the turbo again and with a turbo machine setup. The other way is adjusting the screw where wastegate touch limiting the moving you also can adjust the wastegate axle but normally the problem it is in the screw that i said you first if i dont remember bad its allen with nut(8 or 10mm) for fix the position

[ataiana]

Originally Posted by JeanLuke

A few things to check:

1. Fuse 16 in the power distribution centre is not blown. It provides power for the Auto Shut Down Relay (ASD Relay) which in turn provides power to the turbo solenoid.
   
2. Check there is 12V on pin 1 of the solenoid plug when the ignition is on. Pin 1 is on the right when looking at the plug with the connection tab at the top.
   
3. With the power off, unplug both the solenoid and the ECU. Then measure between pin 2 of the solenoid plug and pin 76 on the ECU C1 connector. The resistance should be below 10 ohms. C1 connector is the bigger one. Looking at the plug with the five big pins at the top, the right row is numbered from 63 at the bottom to 81 at the top. Count up from 63 to find pin 76.
   
4. With the power off, unplug both the solenoid and the ECU. Then measure the resistance from solenoid pin 2 to ground. It should be higher than 1000 ohms.

Hi all from Argentina! I’m fighting with this p0243 issue since last month. It only happens in a full throttle acceleration after some miles driving.
I did all tests quoted here: step 3 gives me no resistence at all. Other tests went okay. Any help out there? Thanks in advance!!!

[JeanLuke]

When you say "no resistance" do you mean zero ohms? If so, this is good. If you mean no connection (infinite resistance) then you have a broken connection or wire.

[ataiana]

So, I’m getting OL, so open loop it is. I should check all the wiring up to the ecu??? 🙃

[ataiana]

Originally Posted by JeanLuke

When you say "no resistance" do you mean zero ohms? If so, this is good. If you mean no connection (infinite resistance) then you have a broken connection or wire.

Update: after following some wires from the solenoid to the firewall nothing was broken. Later I decided to find out where the ground connection that feeds the solenoid (disconnected from the ecu) is located but no luck. In that process I found a loose hose with a plastic connector (it was the front differential vent tube) and connect it properly. After that no more open loop between the solenoid and ground (0.2oms). Tested out in road and P0243 came again after a hard acceleration (not all of them). Now I don't know if I have a bad ground that sometimes fails (only at more than 60mi/h and at 4000 revs) or it might be something else....
Someone knows which ground connection should I look for? Any other idea? Can a bad turbo trigger this error?
Thanks community

[JeanLuke]

That you have measured an open circuit, then had it work for a bit after you played under the bonnet is a strong indicator that you have a bad connection somewhere. The trick is where. It will be painful, but carefully trace it through.

It is for sure not a bad turbo. The error code you are getting is electrical, not mechanical. If it was the turbo you would be seeing P0235.

[ataiana]

Thanks JeanLuke. This post was super helpful and I saved lots of money not buying unnecessary parts. It’s really hard to test this bad ground with the pcm disconnected. Even harder is to reproduce the issue cause I need high engine temperature and high acceleration/final speed. Will be glad to test any suggestion and I’ll post findings to help in future diagnostics.