Hello, once again. I'm here because my temperature sensor is not working.
I'm not sure if its the temperature sensor that went bad, but I do know it connected. The Service Engine soon light is not on. Any ideas on what could be causing this?

Thanks in advance.

 

On a D1, there are two sensors. Both are just to the side of the upper hose where it attached to the thermostat housing, the driver's side. One has a single wire, that runs the guage. The other larger one has a two wire cable and spring clip, that signals the ECU. When my 2 wire is unplugged the ECU will report -40 degrees as coolant temp on my scanner. These are both resistors, so should have some sort of ohm reading, I am away from my copy of the RAVE, might be in the electrical troubleshooting guide instead of the workshop manual.

Why do you think it is not working?

 

I'm not sure, The one temp sensor is 1.9 Volts the other is 1.61 volts. Could that have anything to do with it?

 

The red service engine soon light being on means nothing, it is a emissions service reminder.
You will not get any codes.
As for the temp sensor, its cheap just replace it and be done with it.

 

And you would test those sensors by reading the resistance, not the volts across them. If your temp guage is not working then it is the single wire sensor. If the two wire sensor goes open it will make your scanner read -40 degrees for the coolant temp. Spike is right, swap 'em out if needed. The service soon light can be reset by some sort of jumper, search the forums for that info.

As a young mechanic, I bet you would like going to a big pull-your-own salvage yard. Most fun you can have for a dollar. Not being a life safety or performance item, these are ultra cheap at salvage.

 

Hi,
Real quick, I tool a trip to Cob hill Kentucky, It is about 750' above sea level and is about 30 mins from the Red river Gorge. When I left to come home, my Disco was a bit odd in running mostly as it applies to throttle up. It was sluggish and seem to be running, uh, not so much missing as if it was starving for fuel. The check engine light came on and it ran without further incident. I had the guy at Advance Auto read the code, he did not give me the code number but said it was the low coolant temp. He said legally he could not clear the code until it was resolved. Now after rummaging through the history this is the closet I can come to what I might be experiencing. Does anyone have any input?

 

Rent a live OBDII scanner, plug it in and watch your live engine temps and see what happens.
If it is low coolant temp and the coolant level is full, and the thermostat is good, then its a good chance the sending unit is bad.