96 Tahoe where does computer read engine temp from

V10nacuda · Dec 11, 2018

Kind of an odd question I understand. But my temperature gauge reads about 170. But the Diagnostics through the OBD2 shows about 96 degrees and the temperature outside being about 20 when the trucks fully warmed up. I wondering if it is causing the torque converter lock-up to be disabled. So shows the real-time data on the Snap-on reader.

Does the computer read temperature from a different location than the dash? Cuz it shows transmission fluid 130 degrees plus also.

JackE · Dec 11, 2018

The dash gauge signal comes from a single wire sensor in the drivers side head. The computer gets it's signal from the 2 wire sensor in the intake near the thermostat housing.

east302 · Dec 11, 2018

What is it reading when cold? Is it some oddball number or close to ambient?

Any issues with hot starts?

And, just to make sure, your scanner is reading Fahrenheit, right? It should end up at around 195 (or whatever your thermostat setpoint is) when warmed up.

Sensor replacement procedure is below, note the torque setting. The intake can crack if you really crank it down when tightening.

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V10nacuda · Dec 11, 2018

JackE said:
The dash gauge signal comes from a single wire sensor in the drivers side head. The computer gets it's signal from the 2 wire sensor in the intake near the thermostat housing.

Thanks for the tip!! Might explain the hard starts too!!

V10nacuda · Dec 11, 2018

east302 said:
What is it reading when cold? Is it some oddball number or close to ambient?

Any issues with hot starts?

And, just to make sure, your scanner is reading Fahrenheit, right? It should end up at around 195 (or whatever your thermostat setpoint is) when warmed up.

Sensor replacement procedure is below, note the torque setting. The intake can crack if you really crank it down when tightening.

You must be registered for see images attach

Sent from my iPhone using Tapatalk

Not sure of the cold reading yet.. I scanned it after warm up and took my other vehicle to work.

Starts great when cold... Only warm starts were ifffy...

The temp on the reader is definitely in farenhiet

Do these have two different names.. Advance auto only shows one. I searched engine coolant sensor

jlcms2007 · Dec 11, 2018

Yes if it has a misfire code or something related it will not lock up the torque converter. Yes they have different names, gauge is sender computer is sensor.

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east302 · Dec 11, 2018

V10nacuda said:
Not sure of the cold reading yet.. I scanned it after warm up and took my other vehicle to work.

Starts great when cold... Only warm starts were ifffy...

The temp on the reader is definitely in farenhiet

Do these have two different names.. Advance auto only shows one. I searched engine coolant sensor

It’s the Engine Coolant Temperature (ECT) sensor (versus “sender” like jlcms2007 said above). If it’s bad, the faulty temperature reading can cause the VCM to affect hot starts - try holding the gas to the floor while cranking as a workaround. This puts it in “clear flood” mode, temporarily stopping injector flow.

A bad sensor is sometimes shown by an odd reading when cold... negative 40 degrees or something like that.

Is your upper radiator hose getting hot?

The GM part number is 15326386. I bought this one on my 98 a while back.

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V10nacuda · Dec 11, 2018

Thanks to all that responded!
Looks like I killed two birds with one stone., (or should I say sensor] That sensor was reading about 85° the entire time so it must have been causing the hard start issue and causing the computer not to let the transmission lock up!

Not sure why the 85deg would affect the lock up.. i could see 20deg or less or real hot..

What ever just glad its fixed.

Great forum!,,

east302 · Dec 11, 2018

Glad you got it sorted out, thanks for updating.

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JackE · Dec 12, 2018

Anything fuel injected should have a coolant temperature sensor somewhere near the thermostat housing, 2 wires. If you have a gauge in your cluster, you will also have a coolant temp sending unit, 1 wire, that controls the gauge. I never could figure out why this was necessary, why couldn't they just run both off the same sensor?

96 Tahoe where does computer read engine temp from

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