TW Sensor Clarification

[niles]

Hi All, I recently did some TW sensor troubleshooting because my car has been having a hard time cold starting. I have no engine codes.

I want to clear up some misinformation I came across when reading multiple threads here on 3Geez. This may not be the case for all 3Geez so this is confirmed for an 87 LXi Hatch.

The TW sensor Autozone part number that has been thrown around is incorrect, it is NOT SU4006, and that goes for 5S1468 too at RockAuto. I picked one up and had to return it because the tab on the plug was different. The correct sensor was in fact SU410.

Honda Part Numbers:
TW Sensor = SU410 = 37870-PD6-003
Thermo Switch = SU4006 = 37773-PJ0-661

So to be 100% sure you get the right sensor follow these two easy steps:
1) - Preform proper troubleshooting: Download Service Manual
2) - Compare the tabs on your defective sensor to the replacement sensor

[Dr_Snooz]

Good to know. Thanks for pointing that out.

[Oldblueaccord]

Very well done.

Can we get together and get some pictures of the sensors on the car? I got a J code 88.

Be a good sticky when finished.

[gp02a0083]

excellent write up niles

[niles]

This is interesting, I was reading the engine code check post in the How-To section and noticed that not all 3Geez are the same. https://www.3geez.com/forum/how/81283...odes-pics.html. 89 LXi has a different TW Sensor. Check the pic attached to the Code #6 section taken by ShyBoyCA6. I think that's an 89 in the picture.

So here's mine: 87 LXi - I've never messed with these before but maybe a previous owner had?

[Oldblueaccord]

Well ok here is mine. 1988 3 door accord lxi. its a J code car build date 1987.

Looks opposite?


This is the thread I reference. I didnt realize the picture links are dead in it until today.

https://www.3geez.com/forum/efi-tech/...tw-sensor.html

[niles]

Well ok here is mine. 1988 3 door accord lxi. its a J code car build date 1987.

Looks opposite?


This is the thread I reference. I didnt realize the picture links are dead in it until today.

https://www.3geez.com/forum/efi-tech/...tw-sensor.html

It looks like the tabs on your sensors are both on the same side. Can you confirm that? I am starting to think it might be a pre/post-facelift thing.

[Oldblueaccord]

It looks like the tabs on your sensors are both on the same side. Can you confirm that? I am starting to think it might be a pre/post-facelift thing.

I think it is. The early FI cars where a little different than the later ones.

I would go by the wiring. I see 2 wires on my plug on the left.

Ill get some pics tomorrow I am a bit down on a sore neck and just come from the chiropractor.

[niles]

Thanks for your help oldblue. I was able to at least confirm which is which. Only one sensor will trigger the code 6, and for me its the SU410 sensor.

My sensor wire colors:
TW Sensor: green/white stripe and yellow/green stripe
Cooling Fan Sensor: white/green stripe and black

[Oldblueaccord]

tabs look nearly identical to me?

[Demon1024]

Started working at O'reilly's a couple weeks ago and it looks like their part number for the Tw is 17-1236 I got in, gonna put it on tonight

[Oldblueaccord]

ill put this up as a sticky if some other people can verify this info.

[Oldblueaccord]

This unplugged causes a code 6 on the ECU.

Two vids to help understand its operation a little better.



Second one is with the sensor plugged back in.

[Oldblueaccord]

I highlighted the 200-400 ohm reading as important with the car fully warmed up.

[SamKCMO]

https://youtube.com/shorts/kbfqZ053X...K6KC2Wp-CN2dWc
This is my accord and I have a code 6 is this idle a result of the code 6?
https://www.3geez.com/forum/showthre...29-Where-is-it
In this post shows the sensors mine the one in the yellow box is corroded is this causing the rough idle and rough start or is it a vacuum leak

https://youtube.com/shorts/kbfqZ053X...K6KC2Wp-CN2dWc

[Oldblueaccord]

https://youtube.com/shorts/kbfqZ053X...K6KC2Wp-CN2dWc
This is my accord and I have a code 6 is this idle a result of the code 6?
https://www.3geez.com/forum/showthre...29-Where-is-it
In this post shows the sensors mine the one in the yellow box is corroded is this causing the rough idle and rough start or is it a vacuum leak

If it has code 6 I would fix the connector, test the ohms of the sensor or replace it.

When the sensor fails you car runs very rich.