P0171 and p2195 I'm stuck and don't know

12v is signal right? And the lower voltage wires should be heater?

 

I dunno man I've only had like 6 hours sleep in 3 days trying to figure this out and I'm starting to overthink and second guess myself on the wiring the a/f sensor is putting out 5 volts and the downstream 02 sensor isn't showing any now so I think it's wired wrong. Does the 1st sensor wiring connect or have anything to do with the 2nd?

 

This sounds correct.

Here is how I think it goes

White wire on harness to the Blue wire on A/F sensor
The Pink and Blue on the harness to the Black wires on the A/F
Which leave the Red harness wire. And the other A/F wire.

See if that looks right to you?

 

Okay so I tried that and now the codes are p0031 (heater control circuit low back 1 sensor 1) and p2238 sensor positive current control circuit low bank 1 sensor 1

 

Why are we rewiring o2 sensors for a lean code? If the wiring was incorrect I would expect other codes to set like what you just got

 

The 02 heater circuit is 12 volts on one side (fused battery power) and pulse-width modulated ground control (pcm) on the other side.

The sensor circuit usually won't operate on 12 volts, it'll be something less. A/F sensors report to the pcm with a amperage reading

Not trying to scare you but if the heater circuit was accidentally wired into the sensor circuit the pcm may have been damaged.

Really need to dig into a wiring diagram from both the sensor manufacturer and the truck harness and make sure the wiring is wired correctly.. then hope for the best on the pcm

 

He said he didn’t know if he wired the sensor right. And no one that’s used a universal 4 wire has ever said how it’s supposed to be wired. Denso makes a direct fit sensor.

P2195 says AF is stuck low.

OP can wire it back like he had and check fuel pressure. Other than that I don’t know. I would have put the right sensor in first. Then if that didn’t work. Id have said “the hell with it” and took it to someone that knows what they are doing. Because I sure as shit don’t.

 

Good luck finding the correct diagrams for a Denso Universal A/F. Every one I found said refer to OE wiring diagrams for proper wiring.

 

So here's what I'm reading now at the wiring harness and it's very strange.
On the factory wiring harness side Red lead to Red wire and black lead to chassis ground reads . 13v connect red lead to white wire and black lead to red wire it shows nothing until my hand touches the chassis then it reads like three volts. Red lead to Blue wire and black lead to chassis reads 2.9 volts to and red lead to pink wire black lead to chassis reads 3.3 volts. When I connect the red and black tester leads to the pink and blue wire it reads .39 volts blue wire is negative pink is positive heater wires I believe. When I touch the positive lead to white wire and negative lead to the blue wire it reads 9.4 volts when I touch the positive lead to the white wire and a negative lead to the pink wire it reads 9 volts red lead to Pink wire and black lead to blue wire checking resistance no beep and 394 checking resistance red lead to Blue Black lead to pink I get a beep and it reads -340.
Checking resistance on the air/fuel sensor plugs 2 black wires it beeps and reads .2 even before I plugged anything into it bought new. It's the same color code wiring as the downstream 02 sensor and when I check resistance on it's 2 black wires I get .15

 

Well man, all I can say is good luck.
I got nothing else.

You probably don’t want to hear this,
But you bought a universal A/F sensor with wires hanging out of it.
That was probably mistake 1.
Mistake 2 was asking for help on the internet
Mistake 3 was listening to guys on the internet.

I’d buy good parts and take it to someone that knows what they are doing.
And avoid making any more mistakes.

I’m going to step on out and not help you make any more mistakes.
Good luck buddy.

 

You cant really check and AFR circuit with a meter effectively, they don't operate off voltage. They use a pumping cell that varies it's current based on the O2 concentration.

You can get good advice here but we are dealing with too many unknowns, I would say the first step is to get the correct pigtail wired in correctly and then get the correct AFR sensor, plug it in, clear the codes, and go from there. Otherwise all your doing is building in problems on top of your original issue.

 

Yeah. I was more less referring to me.

But I agree. You never get ahead using universal or aftermarket sensors. Spend the money and buy the right ones.

 

Thanks for all the help and input from you guys I appreciate and ya I just pulled the sensor out and left the wires hanging out chillin until the new pigtail comes tomorrow and I'll swap this sensor for the Toyota oem one and go from there

 

Okay guys so I'm now trying to check for open or shorted circuit on this thing and just wanted additional opinions but the way I understand this connection E4 would be at the top of the black ecm correct? I'm uploading pics

 

Yes the black box to the right is the PCM, I'll see if I can dig up the connector pinouts.

 

Thank you. I'm thinking I may have a short somewhere after the original wires got heated and melted. Just trying to check that now

 

so on this diagram on the part checking harness and connecter were you check for open in the 1st section it says tester connections HA1A(A4-1)-HA1A (E4-1) Body ground I can't make sense of that. Do I check each of those separate or what? Like it doesn't mention were the positive lead goes so I'm guessing positive to HA1A (A4-1) negative to body then put the positive lead to E4-1and negative to body?

 

Or am I supposed to try and connect the leads to the connector plug wire under the truck and at the ecm at the same time? I guess that makes more sense but going to be a little difficult and which side do I connect positive to or will it matter? Sorry for being so needy here man I just really have to figure this out.