two sensors responsible for temperature

[SilkkTheShocker]

Hi I really need the two sensors that check the temperature and make the temp. gauge work, I think one is the water temperature sensor (ecu) and the other is for the actual gauge

thanks

[te51levin]

Hi. What kind of MR2 do you have?

[SilkkTheShocker]

Originally Posted by te51levin

Hi. What kind of MR2 do you have?

oh sorry 1991 non-turbo, 5sfe

[te51levin]

OK, cool. There are actually three parts that read coolant temperature in that housing...
This is the vertical one. It has a single wire, and it sends a signal to the instrument cluster:
83420-16020 - $19.62 - Gage, water temperature

This one leans forward at an angle. It has two wires and it sends its signal to the ECU:
89422-20010 - $49.34 - Sensor, water temperature, for ECU
90430-12005 - $0.78 - Gasket for above

Finally, this one is horizontal, and it only operates the cold start injector:
89462-20020 - $125.44 - Cold start injector time switch

These are written up on quote number 50219 for the time being. Thanks man!

[SilkkTheShocker]

quick question though, my temp gauge isn't working and i was wondering if the reason it isnt is because either the water temp gage and water temp. sensor have failed?

does the cold start time switch have much to do with the gauge?

[te51levin]

Originally Posted by SilkkTheShocker

quick question though, my temp gauge isn't working and i was wondering if the reason it isnt is because either the water temp gage and water temp. sensor have failed?

First I should clarify something. The part I listed as "gage", 83420-16020, is not the instrument in your dashboard. It is the sending unit that runs the gage. Toyota calls it a gage, so that's what I wrote - although Toyota also calls an engine oil dipstick a "gage", so...gotta be careful. Describing the part clearly is far more useful than relying on the name Toyota (or anyone else) assigns it.

The problem is more likely to be the sending unit than the gauge in the dash, but unless you take the time to diagnose the problem, we're really guessing. Still, I do sell the sending unit with some regularity, which indicates that it is a fairly common problem.

Originally Posted by SilkkTheShocker

does the cold start time switch have much to do with the gauge?

No, nothing at all.

[SilkkTheShocker]

Originally Posted by te51levin

First I should clarify something. The part I listed as "gage", 83420-16020, is not the instrument in your dashboard. It is the sending unit that runs the gage. Toyota calls it a gage, so that's what I wrote - although Toyota also calls an engine oil dipstick a "gage", so...gotta be careful. Describing the part clearly is far more useful than relying on the name Toyota (or anyone else) assigns it.

The problem is more likely to be the sending unit than the gauge in the dash, but unless you take the time to diagnose the problem, we're really guessing. Still, I do sell the sending unit with some regularity, which indicates that it is a fairly common problem.


No, nothing at all.

alright ide like to buy the water temperature sender, 83420-16020, and thats it. Ive never bought from you so i dont know what im doing, paypal?

[FrunkMonkey]

Aaron is out on vacation this week so I am taking care of all the MR2 stuff. We dont do paypal, so I will need you to call in with a credit card number. 1-800-888-6305. My name is Tracy. Thanks.

[James6449]

I have a similar sort of problem. My water temp gauge doesn't work atal and the fan doesn't seem to be cutting in when you hit trafic. I've got a 92 gts turbo any ideas guys?

[te51levin]

Originally Posted by James6449

I have a similar sort of problem. My water temp gauge doesn't work atal and the fan doesn't seem to be cutting in when you hit trafic. I've got a 92 gts turbo any ideas guys?

First thing to do is make sure that all your sensors are plugged in! The next step is of course to confirm (with a test light or voltmeter) that your fuses are all good. Very often, those two simple acts will restore functionality to an old car. If that doesn't fix it, then you'll need to get out the trusty workshop manual and see what it points toward. Your UK (or is yours JDM?) car is built a little differently than our US cars so the part numbers and details may be different...