Knock Sensor Harness? (3 Viewers)

[VentricularFib]

Probably an easy answer, but couldn't find it through the search tool. A bunch of info and pics of the starter and knock sensors, but nothing on the harness itself.

BACKSTORY: So when I had the starter replaced on my truck, I went ahead and had the knock sensor on bank 1 (P0325 CEL) replaced as well. Drove fine for about 100 miles, then CEL turns on again for the same code. Reset it and never came back for another 3.5k miles. Light goes off again today and truck runs on limp mode. Took it back to the mechanic since it was covered under warranty. He tested the sensor wires with a multimeter and said everything looks good, reset the light and told me he would have to charge labor if he has to pull the intake (warranty was just for parts). Safe to say I'm not going back.

Anyway I plan on tackling the job myself to pull the intake and just replace the harness entirely. Mechanic only replaced the sensor itself and used the old wire and harness that's 23 years old and brittle as heck.

I found the harness online and it looks like its a 3 way connector like "Y shaped". 2 that split to the knock sensors, and 1...well that's my problem. I don't know where it goes. I'm trying to do as much research before I pull the intake and running into a obstacle. Here are some pics from other members that I edited that kind of explain my issue.

1. Bank 1 sensor
2. Bank 2 sensor
3. ???? where is does this connector go? do i have to remove the starter to access wherever it leads?

harness.jpg​

is the 3rd connector underneath the wire looms? or does it connect to these guys behind the starter?


again not my pics....all from other threads.

 

[jerryb]

it's in the main loom to the glove box. It probably doesn't have any intermediate connectors in it until the ECU.
Find an ecu pinout.

I'm in the same boat. passenger side, second intake pull, blah blah, waiting til winter. I was going to run a 4 conductor set through there and redo to the ECU.

On the one wire knock sensors like in the picture above, it's just that, one wire. the vvtis are two wire.

 

[VentricularFib]

it's in the main loom to the glove box. It probably doesn't have any intermediate connectors in it until the ECU.
Find an ecu pinout.

I'm in the same boat. passenger side, second intake pull, blah blah, waiting til winter. I was going to run a 4 conductor set through there and redo to the ECU.

On the one wire knock sensors like in the picture above, it's just that, one wire. the vvtis are two wire.

That 3rd connector goes all the way to the glove box? Jeez. The pic online only seems like it's a bit over a foot and a half. As much as I'd like to just fix the one wire, I feel like doing the whole thing for PM so I don't have to pull the intake again. You're right tho. I think I'll wait till it gets cooler.

 

[awesomeissquid]

If I am understanding correctly, this is the harness you are referring to (the one with the two knock sensors located within the valley).

The other connections within the valley on this harness are for the starter. It does not go into the glove box to the ECU and instead routes to the front of the engine. The main wiring harness that penetrates the firewall and connects to the ECU is different and is not a part of these connections. This harness has terminations at the battery for the starter (positive and negative side) and two other sensors which I can’t recall. The plastic piece in the top right of my image is the mount that holds the harness. It is attached at the rear of the engine block. I don’t recall 100% but it should be accessible. Let me know if you need more info or pictures.

 

[jerryb]

yup, my bad. This is why I shouln't F with non vvti.

 

[VentricularFib]

If I am understanding correctly, this is the harness you are referring to (the one with the two knock sensors located within the valley).

View attachment 3073418

The other connections within the valley on this harness are for the starter. It does not go into the glove box to the ECU and instead routes to the front of the engine. The main wiring harness that penetrates the firewall and connects to the ECU is different and is not a part of these connections. This harness has terminations at the battery for the starter (positive and negative side) and two other sensors which I can’t recall. The plastic piece in the top right of my image is the mount that holds the harness. It is attached at the rear of the engine block. I don’t recall 100% but it should be accessible. Let me know if you need more info or pictures.

When you say attached to the rear engine block, are you talking about just behind where the starter sits? Like in the second pic? Also partsouq isn't helping with the the part number for the harness, but only for the sensor itself. If I were to use part number 82219-0C020 I can pretty much plug and play?

 

[awesomeissquid]

Went back and checked my pictures. I was wrong, the plastic attaches to the starter. What do you mean when you say "only for the sensor itself"? Why not just get the pigtails and swap out the plugs within the connector if they are faulty?

 

[VentricularFib]

Went back and checked my pictures. I was wrong, the plastic attaches to the starter. What do you mean when you say "only for the sensor itself"? Why not just get the pigtails and swap out the plugs within the connector if they are faulty?


View attachment 3074377

I was looking for the harness to replace everything without having to splice. (not the best when it comes to electrical). Wanted everything to be in good condition to prevent having to pull the intake again. Preventative measures. Partsouq didn't provide the harness but just the actual knock sensor.

 

[awesomeissquid]

I took a quick look and didn’t see the full harness. Not sure if it is available. Might have to reach out to your local Toyota dealer but I would assume it would be pricy.

 

[Qtonic]

I found reference on a 4.7L Tundra forum that the harness is not available separately. I think it comes as part of this (821216A010) larger loom collection, but its expensive ($1000+) and seemingly not very available new.

There was talk about using this V6 part number (8221934010) and splicing or changing the incorrect connector. Take a look and see if the others are correct and if you think it's long enough. If so snap a good pic of the third connector and I'll find it for you. There's a good chance it won't even need to be spliced, just pop off the end and stick the pins in the new connector.

 

[VentricularFib]

I took a quick look and didn’t see the full harness. Not sure if it is available. Might have to reach out to your local Toyota dealer but I would assume it would be pricy.

Yeah I'm gonna head to my local dealership and ask tomorrow. If not I'll try my hand at splicing

 

[VentricularFib]

I found reference on a 4.7L Tundra forum that the harness is not available separately. I think it comes as part of this (821216A010) larger loom collection, but its expensive ($1000+) and seemingly not very available new.

There was talk about using this V6 part number (8221934010) and splicing or changing the incorrect connector. Take a look and see if the others are correct and if you think it's long enough. If so snap a good pic of the third connector and I'll find it for you. There's a good chance it won't even need to be spliced, just pop off the end and stick the pins in the new connector.

View attachment 3074598View attachment 3074614

Good God I just searched the part number for the harness. Cheapest I found was 950! I did come across a similar thread about sourcing the similar part, but I didn't know about compatibility. Only one way to find out. I'm sure if the wires are the same gauge and find the matching connector, it should work like you said. Hell Ill maybe even try the ones from amazon and napa for $40. Worse comes to worse, if i some how F this up, I have a few free tows to a reputable mechanic. Shouldn't cost me so much in labor if the intake is already pulled.

 

[OwnerCS]

How did this turn out with this part number 82219-34010? I like to have healthy connectors under the intake manifold.

 

[VentricularFib]

How did this turn out with this part number 82219-34010? I like to have healthy connectors under the intake manifold.


View attachment 3654056

I ended up just splicing a new wire and connecter from Amazon into the knock sensor. Got it from Amazon. 2 years later and no problems. Part number

90980-11166​

 

[OwnerCS]

I ended up just splicing a new wire and connecter from Amazon into the knock sensor. Got it from Amazon. 2 years later and no problems. Part number

90980-11166​

Excellent! Thank you. Great idea!

 

[Eyedaho]

Excellent! Thank you. Great idea!

I built a new one also, and installed it a few years ago to rectify knock sensor codes. No issues since. Just the three connectors, wire, and loom. If I recall correctly it plugs in near the starter.

I think the knock sensors themselves are pretty robust being piezoelectric.

 

[OEMGUY0720]

This on a non-vvti (2000 model 100 series). The locking clip on the male plug broke off it was very brittle.

Will try out the amazon option as recommended by @VentricularFib https://a.co/d/8GS9YsX