P0033 - Turbo Wastegate Circuit

[tabkey]

Hello all,

I recently had a rodent enter into the engine on my 2015 Sonic LTZ. I think it may have chewed one of the wires that participates in the wastegate circuit, as the car threw P0033 last night.

I found the connector on the solenoid that controls the wastegate actuator, but I can't see where the wire goes without pulling parts.

Can anyone who has experience with the wiring describe the route that this wire follows in the engine bay? Any annotated pictures would be much appreciated.

Also, if anyone has the shop manual, wiring diagrams for the wastegate circuit would be much appreciated.

Edit: Or if anyone can test the wastegate solenoid harness connector with a multimeter and tell me what the voltage should be, that would help me diagnose the issue. I'd like to know if the circuit is not providing voltage or if the solenoid has gone bad.

 

[tabkey]

I found the problem. At the rear of the engine on the right-hand side (if you were in the car driving, right-hand side) behind the air intake and on the bottom side of the intake manifold, there's a sensor of some kind. It's next to a vacuum line that has a green stripe on it going into the intake manifold.

The rodent chewed through the two wires going into that sensor. One wire is purple and the other is green.

Anyone know what these do or what that sensor is?

I'm getting out my soldering kit and some tinned OFC 16 gauge wire to fix the problem. Just curious what was not functioning on the drive home last night.

 

[tabkey]

Problem is fixed. Still wondering what that sensor is though - it has one of the vacuum lines with the green stripe going into it, or near it. Kind of on the bottom side of the intake, directly above the alternator.

 

[Tormach]

Problem is fixed. Still wondering what that sensor is though - it has one of the vacuum lines with the green stripe going into it, or near it. Kind of on the bottom side of the intake, directly above the alternator.

That is the by pass solenoid, regulates how much boost is delivered. It will bleed off boost to keep the power level where the ECU tells it to.

I like most people on the forum have bypassed it, also referred to as 'bypassing the bypass' mod.

Here is a link that will better explain it by MPFab

http://www.sonicownersforum.com/for...on/10742-bypassing-bypass-valve-solenoid.html

Sent from my XT1254 using Tapatalk

 

[tabkey]

Thanks for the reply!

I see - I'm not sure that I want to start bypassing anything, but I'll read through the thread.

I like to keep things stock if possible. I've done that with my third gen Camaros and Firebirds and never had issues. I've been active on thirdgen.org for many years, and always found the information and experience from forum users to be helpful. Glad that I found sonicownersforum.

 

[Tormach]

No problem.

Always feel it is helpful to understand what thise random thingamabobs and whatchamacallits do under the hood.

Sent from my XT1254 using Tapatalk

 

[tabkey]

It really is. When a code is thrown I have a much better idea of what to look for.

I have lots of experience with the L98, LB9, and LB8 engines from 1985 - 1989, but their operation is far different from this turbocharged 2015 LUV.

Anyway, thanks again for the response.

 

[dannyb]

Sorry for resurrecting this old thread, I have a small situation,
I recently bought a 2012 sonic turbo, I replaced turbo and all lines around it, the new turbo came with the wastegate which I did buy from the dealer which also came with the new solenoid, after turning on the car I had two codes pop up. And can anyone plz help me