Where does this small wire connected to the wiring harness go to? I don’t see it in the manual.
Wiring harness small wire into the abyss
- Thread starter David Rodgers
- Start date
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According to the EWD page 22 it's labeled as H8 right O2 sensor.
tmxmotorsports
SILVER Star
Either o2 sensor or abs sensor
tmxmotorsports
SILVER Star
I think
hisandhers80s
SILVER Star
Correct, both wires go to the O2 sensors. One goes over the top of the transmission and the other drops down between the inner fender and firewall on the passengers side.
- Thread starter
- #6
Thanks, pulling the engine soon and want to make sure I don’t miss anything. Doing it by myself so that should be fun.
I just went through this exercise yesterday. Starting from the rear, you need to unplug
1. (2) O2 sensors
2. (3) transfer case plugs
3. (2) transmission plugs on one side – NSS and ATF oil temp (it's in the fitting at the transmission end of the hardline)
4. (2) transmission plugs on the other side – speedo and solenoid pigtail
» if you want to pull the engien harness separately:
5. (2) engine – transmission connector housings, both directly above the starter
6. oil pressure sensor on the right side of the block
» on the left side of the block:
7. (2) knock sensors
8. (1) oil level sensor
9. (4) head sensors
10. (6) injector connector housings (just plan on buying six new ones, the latches will break on at least three)
11. (1) EGR sensor
12. (1) AVF sensor
13. (1) DLC 1 connector on the firewall
14. (4) ECM connectors behind the glovebox
I'm sure I forgot one, I did this from memory.
EDIT:
I forgot the alternator and distributor connections, as well as the grounds.
I'd remove the hood, radiator and bumper, but leave the A/C compressor connected and roped over on the side, so that you don't have to fool with discharge and recharge.
Last edited:
- Thread starter
- #8
Thanks Malleus, On passenger side (US) the o2 wire looks like it dives down over the fender. I haven’t spent too much time over the weekend checking it out. But, will the o2 electrical connector pull through or will I have to pull the wires out of the o2 connector so that I can pull it through? I’m pulling engine/tran/transfer/wiring harness all at the same time. Thanks so much. Sure does help to have guys like you giving advice.
For all the connections on the transmission and transfer, I'd unplug them from their respective sensors and tape them up/over to the side, out of the way.
If you want to leave the engine connections in place, and unplug them after you pull the drivetrain, just unplug the ECM from behind the glovebox, pull the DLC1 connector off the firewall, unplug the AFM and unplug the two (2) connector housings over the starter. Unfortunately, if you choose this option, you have to fish the O2 pigtails out from under the fenders.
As old as the wiring harness is, and given the fact that unlike the 3rd gen harness, the 2nd gen harness ('93-'94) is NLA, I'd leave that alone until the drivetrain is out, and there's room to go fishing under there. I know it's more work to go around and unplug everything, but the risk of damage is lower, IMHO. Just my 2¢.
As I said above, just assume you have to replace all (6) injector connector housings. If you break just one, and you will, then all the others are just as brittle and you can assume you just got lucky with them. The part number is 90980-11153; these connector housings do not come with seals. Ballenger has them. The green ones (oil & high temp rated) are their number CONN-00119, the black ones (these are on my '94 and both of my '95s) are their part number CONN-00145 and the brown ones are their part number CONN-00146. These all fit wire gauge 20-16 and are genuine Sumitomo parts.
» The OEM harness from the factory had two colors (odd and even cylinder numbers), brown(–ish) and gray, but all the new ones are gray.
Oh, and be really careful with the round connector on the head. That one is unobtanium (it irritates me that the sensor is readily available everywhere, but its harness–side mate is not). If it's broken, you'll have to search salvage yards for a '90s vintage Toyota; they all used the same connector on the engine harness. You can get terminals (they are type 2.3II, I think, for all engine connector housings) and seals for them, though; Ballenger has them aplenty (search for Sumitomo TS/SL terminals). Other stores (here and abroad) carry them, but I am a fan of Ballenger's customer serivce, so I recommend them whenever I can.
hisandhers80s
SILVER Star
The round ECT plug for the 1994 harness is available. The number I ordered is 90980-10156.
You are correct! I was writing from memory (and a recent post on rehabbing an engine harness). The number on my engine harness side connector housing is 90980-10412, which is long gone. However, Toyota also lists that same connector housing as part number 90980-10156.
That only leaves three connector housings unavailable. Not bad for a 30+ year old electrical wiring harness.
That only leaves three connector housings unavailable. Not bad for a 30+ year old electrical wiring harness.