Carguy or 91TR - I have a question.

Unfortunately I'm not at home so I can't look up the answer to your question. From my faulty memory, there are 2 sensors on top of the goose-neck housing. One is the thermo-time switch and one is the temp. sensor. There are also some other wires secured on a stud, and also I think there is a spade connector on the side or rear of the housing? Was everything labeled before disconnecting for the engine-out job? If Steve-91TR pops into this thread I'm sure he'll have your answers. I'll check in on this thread tomorrow and if help hasn't arrived I'll try and find out as soon as I can.

 

I'm not sure that I fully understand what the question is, but here are the overall details of the sensors/devices mounted in that large water housing at the front-top of the (US) TR engine:

forwardmost gizmo pointing up = KE-Jet dual-channel water temp sensor
2-pin molded connector
one CB (orange/white) wire and one CR (orange/red) wire
tells the injection ECUs the water temperature (not used by the water temp gauge)

2nd from front gizmo pointing up = Thermo-time Switch
2-pin molded connector
one BL (white/blue) wire and one RV (red/green) wire
used to fire the cold start injector for a short time during starter motor cranking when cold

gizmo at the back pointing rearward = water temp gauge thermister
one H (grey) wire with female spade terminal
runs the water temp gauge

horizontal gizmo pointing towards the LH side = bimetallic water thermoswitch
two separate wires each with a female spade terminal (polarity doesn't matter)
one R (red) wire and one CN (orange/black) wire
used to tell the injection ECUs "cold" (closed) vs "hot" (open) and for running the air injection system when cold, etc.

Obviously, if the water temp gauge is the problem you'd be looking for trouble at/with the water temp gauge thermister, but, since this is a single wire device, I'm surprised there'd be confusion. Also, check/reseat the 9-pin square connector underneath the coolant tank (that H wire from the water temp thermister passes thru this C11 connector on its way to the gauge).

Anyway, give a shout with a more specific question if this doesn't suffice, or describe the symptom/problem in more detail.

 

No trouble and that makes perfect sense (grounding the H wire should cause the water temp gauge to read the maximum value and is the usual first test to determine on a "dead" gauge if the problem is the sender or the gauge itself) -- glad you got it sorted out easily.

 

Steve
My water temperature gauge isn't working and showing "Cold" pegged left even when the car is hot. I read the above possible fix but not sure where the "H" single wire is. do you happen to have a picture of where I can find that??
I found the square connector under the coolant tank. Thanks again!

 

Is this it? (borrowed your pic)
Image Unavailable, Please Login

 

Yes

 

Holy crap theres alot of stuff in the way of the thermister
one H (grey) wire with female spade terminal...I did remove and spray with contact cleaner the 9 pin C11 connector under the water tank but no luck. How the heck to you get to the H wire?? Do you guys stand in the engine compartment some how?? should I remove something to get to it? I can try using smoke and mirrors and a long needle nose to remove and reconnect it. Any ideas? Thanks

 

Steve
Can I ground the grey wire in the C11 9pin connector to see if the gauge goes to full hot w/ the engine running??? Or just key on?? If it goes to full hot..then it means the gauge is working okay??
Thanks!

 

Yes (just key "on" is fine, engine doesn't need to be running -- but that's OK too -- although engine running might only be possible with C11 still plugged in -- I haven't checked the circuits).

Also, you don't need to unplug the H wire from the thermister. (Don't know if this is possible or not, but) If you've got a long probe from a multimeter that you can touch to the bare areas on the thermister terminal and/or the female terminal attached to the end of the H wire and touch the other end of the probe wire (that normally plugs into the multimeter) to the engine (ground), that should work too.

 

Steve
I shook around some wires around the H wire and removed and cleaned the 9pin plug again and yee hah! Water Temp gauge is working once again!!
I appreciate all your wisdom Steve...i'm gonna start calling you the "Guru"
Thanks again!!

 

Dear Ferraristi,


I thought we already elevated him to Jedi Master?



Shamile

Freeze...Miami Vice !