Temperature Sensor/Gauge

PlayingWithTBI said:

Yeah, I saw it, enlarged it, and read it fine.

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Message is still there.

Maybe your not normal?
I was thinking it was the emoji that was “offensive”.

Caman96 said:

Maybe your not normal?

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I already know that, tell me something IDK

tayto said:

this is from a '92 gmt400 FSM. 1400 ohm (cold aka 100*f) and 55 ohm (hot aka 260*f) falls within reason to the CTS values posted, FWIW....

EDIT: by placing a resistor in place of the temp sensor, one could easily "recalibrate" their temp gauge by moving the needle. i will possibly try this weekend if i can find my stash of resistors

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i dont know what you are trying to say. Im talking about how the ECM and the gauge dont read the same thing. the ECM is -40 or -30 to 260 ish and the gauge starts at 100 and goes to 260.
IE its not meaningful to try and get a "ECM temp" from the sender and gauge, because its going to be hard to say what number is most shown by the gauge and then also if the sender/sensor are not at the same spot, that will change it too

i have been talking about the gauge sender and ECM sender using the same resistance values vs temperature. I don't know what you're point was or is, but your original comment/assumption (with no proof other than you guessing) is wrong. just because the gauge doesn't read -40 doesn't mean the sender stops working. the gm temp sensor chart that was posted (for the ECM sensor) very closes matches the values that the gauge sender uses (no surprise to me here). I also did some measurements this morning with an old gauge sender and new gauge sensor and the values closely matched the chart posted. you have no evidence to back up "most definitely not since the gauge reads a far smaller range". it seems to me you "most definitely" don't know what you're talking about.

i did some testing this morning. the old original gauge sender read about 200 ohms MORE than the AC delco 96-2000 sender. I am guessing this could be age or manufacturing tolerances, but either way the gauge actually reads the most "correct" it ever has. please note my gauge is in celsius, but still has the same about of marks as the Fahrenheit gauge.

I have been having issues with my temp gauge so I have been trying to troubleshoot. I could break down my process if necessary but my latest diagnostic test has been hooking a multimeter to the temp SENSOR (next to the thermostat) and the temp SENDER (between cylinders one and three) and monitor the resistance as the engine warms up. At the same time I used an infrared thermometer pointed at the junction between the sensor/sender and what they are screwer into, respectively.

I found out was they are nearly identical temperature wise, with the SENDER being a little cooler than the SENSOR. (Maybe 5 degrees at the most).

Resistance wise, I had nearly identical Ohm readings for both, the SENSOR being a little lower. (Which makes sense because it’s warmer) Both the SENSOR and the SENDER followed the temperature/resistance chart found in many places on these forums.

This is with a brand new Duralast SENDER and a four-year-old SENSOR installed before I bought the truck.

92 C1500, 5.7L, 117k mi, RCLB

not a big surprise. so far the only real difference I can see between them is the gauge sender is 1 pin and the ECM sensor is 2 pin. sender grounds through the block, ecm sensor supplies its own clean ground. we could get more scientific about this with a heater, oil, thermometer & ohm meter and plot our own chart, but the gauge reads accurate enough for me and more importantly the owner, who is the one that drives it all the time.