V1 Oxygen Sensor Bank 1 (Upstream) Diagram

[Robinjo]

Can anyone pull the wiring diagram for a 2006 SS (Supercharged) for the Bank 1 oxygen sensor? I'm looking for where the wires go to in the ECU or Fuse Block. I can't get Charmi to load (work firewall) and AllData is being slow getting my license renewal done.

I'm getting code P0134 - O2 Circuit No Activity Detected. I cannot see the O2 sensor in HPTuner so want to check continuity. I've already tested the sensor itself.

 

[Gtstorey]

How did you test the sensor?

 

[Robinjo]

Checking resistance across the two circuits and then continuity across the two circuits. I had my old one and a new one, they both tested similar.

Circuit 1 two black wires (heater)
Circuit 2 the white and the blue wire (sensor)

 

[Gtstorey]

That code probably won’t be on the heater. I don’t think resistance across the sensor can eliminate a bad o2. They are more complicated than that. I’m not saying it is the sensor but you can’t count it out at this point.

 

[Robinjo]

I'm also trying to check the wiring. On the Cobalt SS forum some had breaks in the wires.

 

[Ross]

This is the wrong chart... see Rauq post below.

 

[Rauq]

Alert! Unfortunately the diagram Ross posted may not be accurate for an '06 LSJ - the giveaway in the posted diagram is the reference to "Engine Control Module (ECM)". An LSJ diagram should refer to "Powertrain Control Module (PCM)". I've had pretty good results searching for similar diagrams on the '05 in charm.li

The '05 diagram is here:

The C2 pinout generally confirms this.

 

[Ross]

Good catch. I did follow the links for a 2006 LSJ, but Charmli lead me astray.

 

[Robinjo]

Thanks, this gives me something to check. I did check my 10A emission fuse, it was ok. Just making sure I'm reading this right, this is the upstream O2 sensor? Rear should be the downstream (post-cat) which I do not have any longer.

 

[Gtstorey]

Thanks, this gives me something to check. I did check my 10A emission fuse, it was ok. Just making sure I'm reading this right, this is the upstream O2 sensor? Rear should be the downstream (post-cat) which I do not have any longer.
View attachment 53866

Yes you are reading it correctly. Emission's fuse will only affect the heater. And with the pull up and pull down resistors, I think you would get different codes with broken wires on the sensor circuit, but I couldn't say that for sure without checking the service manual.

 

[Robinjo]

Thanks for confirming. I just wanted to be sure I was looking at the right one.

 

[Rauq]

Good catch. I did follow the links for a 2006 LSJ, but Charmli lead me astray.

I could have worded that better- you posted the right diagram, but Charm.li's diagram contains bad info. That's not on you, that's on them. I'm just very aware of the ECM/PCM difference on diagrams because of some wiring stuff I'm working on. All good!

 

[Robinjo]

Haven’t checked for broken wires yet but looking for thoughts. My car idles fine cold, MAF and O2 read normal. It oscillates as expected. Once the car warms up, the O2 just reads a flat with no oscillation. Car hesitates at idle and sometimes dies in this condition.

MAF is good as is Oxygen sensor.

 

[Rttoys]

Cold it’s in open loop, so it’s going off a set programming. With heated O2’s (HO2S) it should hit closed loop fairly quickly Though. Have you replaced the O2? Just because?never know.

 

[Robinjo]

Yes, replaced the O2 sensor (twice) and the issue is still present. It is giving a P0134 - No oxygen sensor activity detected code during this.
I thought your explanation might be the situation. I’m going to probe the wires today.

 

[Robinjo]

Probed the wires to test continuity from the diagram. Any suggestion what to test next here?

5291 Pink/Black to fuse block C1-8 --> Continuity. This circuit I'm not sure about. It joins to many other 5291.
1666 Purple to ECM C2-48 --> Continuity
1667 Tan (Yellow?) to ECM C2-32 --> Continuity
676 Green to ECM C2-58 --> Continuity

 

[Ross]

Check for voltage.
With the car on, you should get 5V+ on the Purple, high signal reference.
The Tan, HO2S should be <5V+ and >0V. I see this is grounded internally inside the PCM, so check ground on the PCM case.
The Pink/Black wire should have 12V+ when the key is on.
The Dark Green should only get ground when the PCM commands the O2 sensor heater, which occurs soon after key on.

 

[Gtstorey]

While Ross isn’t totally wrong, the voltage on narrow band o2s are actually a lot tighter than 0 to 5. I don’t have a service manual for your donor but I’m pretty sure all GMs use the same control strategy. My 2010 Camaro manual states that voltage is supposed to be 0 to 1275mV.. But these voltages can be difficult to read with a regular volt meter since the current is so low.

Have you looked up the oem diagnostic? It’s pretty simple in the Camaro manual if you have a scanner or HPTuner, as long as the error is repeatable.

Where are sourcing the o2 sensors. Any thing but GM can be problematic, and even those aren’t 100%.

 

[Robinjo]

Well, put it all back together and checked the voltage outputs and they all seemed decent. The tan (maybe yellow) one wouldn't read but just a blip on my meter, so I considered that Ok as per Gtstory's post. Went for a drive and the issue seems to have gone away. I think my Fuse Block C1-A8 connector might have been a little loose.
Oxygen sensor is a Bosch unit, they have been decent for Mazda so far. The next time I have to change it I'll look for the GM unit. Is that considered ACDelco?

 

[Gtstorey]

I think Bosch is considered about the worst for GM. Typically GM and Ac Delco are considered to be about the same. I think the experienced guys on GM section of HPT also say that NTK also work for GM but I could be wrong and it’s NGK or Denso is the other brand they recommend.

I doubt that this is a fuse box issue That would only affect the heater and heater would be a different code. And that code would probably keep it from going into closed loop. And it probably only runs the test for p0134 in closed loop. It’s more likely a bad connection on the sensor circuit or internal to the o2 sensor. But again this is based upon the assumption that the control strategy is the same as my Camaro. A very good chance that is true but it isn’t 100%.