Needless to say, i think i may need to replace this sensor. However, to make sure i'm even looking at the right sensor, can someone tell me exactly where this one is located at?

p0243 - Turbocharger Wastegate Solenoid Control Circuit

I've looked over a few threads hoping someone would have a picture for reference, but it looks like i'm out of luck there.

A cell phone picture or anything would be nice. Thanks!

 

There is a small module mounted underneath the turbo with a wiring connector & 3 vacuum lines going to it. One of these 3 lines goes to the wastegate actuator. I think that's it.

From underneath the car, look up at the turbo, look for the gold wastegate actuator and follow the vacuum line to where it disappears. The solenoid is mounted to the bracket with a size 27 torx. Very hard to see and to get at it.

 

I got the same code when i forgot to plug the connector on the boost solenoid, try reconnecting it and clear the code and see if you still have boost. If not than the solenoid is most likely dead.

 

Well, at least i'm sure i'm holding the right part in my hand.
Stock turbo is gone, and a greddy profec has been used to control boost.
I did have to move the wastegate actuator out of the way. I'm thinking a wire may have backed out of the connector.
Tested the actuator with a 12v current and it opens/closes like it's supposed to.

Tested the actuator with a 12v current and it opens/closes like it's supposed to.

Just plugged it back in and the code is still there, after being cleared several times.
Does the connector/plug have any voltage going to it that i could test for?

 

Bump.

 

3 ports on the sucker right? I would think that two should pass airflow deenergized and two would pass energized. I don't know which is the common one though. Need some diag info from the tech notes.

 

I've been reading up a ton today on the code, and seems like a lot of people got this code in synch with either a p0171 or p0170 on other cars. I do remember getting a p0171 when this code first came up. Hmmmm.
Yea, that was the correct one with 3 ports on it.
It baffles me that it'd fail since it commonly isn't even in use. I'm running a seperate boost controller due to a turbo swap.
However, if it is due to a maf failure, it makes a bit more sense now.
I'm assuming it's #6 on this illustration:

 

Yep, that's the location I was thinking of for it. Sorry I wasn't more help.

 

Not that it really helps you solve your MIL, but:

Looking at #6 in that diagram, the hose on the solenoid they show to the right hooked to the solenoid (not the hose all by itself in the right, that goes to the WG actuator) is the "common" going to the scroll. The one on the left is the vent going to the inlet of the turbo. With the solenoid unpowered you should be able to blow from the common -> WG, because in case of solenoid failure you obviously don't want to slam that shut

If it works anything like most cars with a BCS, one pin will be constant 12V and the other is just a ground the ECU cycles rapidly to control boost.

 

Ok, so when we hit it with 12 volts, you could hear it click internally. kind of a studdering click though.
Still possible it may be bad?

 

I was wondering if I was to put a resistor in the harness could I control the boost? Any educated info would be helpful. Trying to do a cheap mod.

 

A resistor on a PWM device like this will do nothing to control its duty cycle.

 

Put a restrictor (plug it somewhat) in the WG line that runs from the boost solenoid to the WG actuator.

 

So, if i turn the car on, i should get 12v coming out of the connector to the wastegate solenoid?

 

There isn't much in GM service information on this , sorry.

Circuit/System Verification
• Perform an inspection of the TC. Refer to Turbocharger Cleaning and Inspection.

• Use the scan tool output controls to command the TC Wastegate Solenoid parameter from 0-100 percent. An audible series of clicks when the command is between 20-90 percent should be heard and felt.

• Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing
•Clear the DTCs with a scan tool.
•Inspect for damage to the TC wastegate actuator.
•Ignition OFF, disconnect the harness connector at the TC wastegate actuator.
•Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal 2 and ground.
⇒ If a test lamp does not illuminate test the voltage supply circuit for a short to ground or an open/high resistance.

•Verify that a test lamp does not illuminate between the control circuit terminal 1 and ground.
⇒ If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.

•Connect a test lamp between the control circuit terminal 1 and the voltage supply circuit terminal 2.
•Command the TC Wastegate Solenoid parameter to 50 percent with a scan tool. The test lamp should illuminate and flash rapidly when commanded to 50 percent and turn OFF when commanded to 0 percent.
⇒ If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

⇒ If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

•If the circuits test normal, test or replace the TC wastegate actuator.

 

Well, i believe i may have found my problem. . . .
Went to start testing voltage coming out of the connector for the wastegate solenoid, and after moving it around a bit, the connector fell off, leaving the two wires sticking out of the wire loom.
Awesome.

 

Bringing a thread back from the dead here, but i have the same problem. How did get the connector back on the wires? My turbo was not building full boost, or it would boost and then drop off to 0. I got this code, put a new solenoid on the off of another turbo I have. Still had the same problem. As i was taking it off again to test the wiring the connector came apart from the wire like it did with pt5457balt. I'm not really sure what to do now.

 

New connector.

 

There is a lot of heat in that particular spot. It doesn't surprise me that the plastic gets brittle.

 

I have a similar problem where boost is either on or off intermittently and triggered the p0243 code for the wastegate solenoid. When I get time I'm going to check the connector, hopefully it's just the solenoid that needs replacing.


Were you guys able to get it boosting properly?

 

Just wanted to update this for any one else having similar issues. Last night the car was on the lift and we tried disconnecting the solenoid from the turbo to swap in a different solenoid and the wires literally fell apart from the connector. So we linked together another connector, cleared the wastegate code, and been boosting fine ever since.

 

Where did you get the connector from

 

Oby had a spare off a harness

 

This maybe a a dumb question, but what's oby? I had this exact same thing happen to me, and i can't find a new connector.

 

Obi is a local dfwgmelite member