4R100 Trans. Temp. Sender Voltage
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Laughing Gas
Joined: Aug 2008
Posts: 823
Likes: 5
From: Dallas, Oregon
4R100 Trans. Temp. Sender Voltage
Does anyone know the relationship of voltage to temperature for the factory temperature sender that talks to the PCM? The service manual says that the voltage should be 4.5V at -40* C (-40* F) and 0.3V at 150* C (266* F). If the rate of change is linear (equal all the way through the scale) then at 65.56* C (150* F) it should read about 1.89V.
Since it doesn't get much below freezing here in Oregon, much less 40 below, and I don't want to heat the fluid up to 266*F just to test things, I'm looking for one or two readings in the normal operating range to verify that my gauge is reading correctly. It seems to be correct at ambient air temperature (high 40's F).
Since it doesn't get much below freezing here in Oregon, much less 40 below, and I don't want to heat the fluid up to 266*F just to test things, I'm looking for one or two readings in the normal operating range to verify that my gauge is reading correctly. It seems to be correct at ambient air temperature (high 40's F).
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Laughing Gas
Joined: Aug 2008
Posts: 823
Likes: 5
From: Dallas, Oregon
I'm trying to verify the temperature readings of a BD X-Monitor. It taps into the output of the transmission wire to the PCM. I was going to tap a digital voltmeter into the line to compare the voltage to the temperature display.
My service manual CD jumps from pinpoint test A (Vehicle Battery Index) to test C (Reference Voltage Index). I can't find a pinpoint test relating to the trans. temperature. I looked in the gasoline section, and could not find anything there, either.
If the gauge reads low, I will set my warnings lower. If it reads high, I will adjust that direction. I just want to verify the gauge reading.
Thanks for the help!
My service manual CD jumps from pinpoint test A (Vehicle Battery Index) to test C (Reference Voltage Index). I can't find a pinpoint test relating to the trans. temperature. I looked in the gasoline section, and could not find anything there, either.
If the gauge reads low, I will set my warnings lower. If it reads high, I will adjust that direction. I just want to verify the gauge reading.
Thanks for the help!
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Look in the workshop manual under automatic transmission. (section 307-01) That's where the pinpoint tests for the tranny are. Pinpoint test A is for the shift solenoid, test c is for the TCC solenoid
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
A better way rather than trying to infer the temperature from the voltage which is all the Xmonitor is interpreting would be to take the actual temperature of the fluid. No good method to suggest this if you don't have a thermistor you could drop down the dip stick tube or an infrared that you could take the pan temperature which would be really close to the fluid temperature. You could also scan it to see what the ECM thinks the temperature is and compare it.
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Laughing Gas
Joined: Aug 2008
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From: Dallas, Oregon
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Post Fiend
Joined: Feb 2007
Posts: 7,191
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From: Blairsville,Ga
my voltage shows 1.33 volts @142* & 1.455V @ 136.6* but also shows 1.76V at 123* and 1.82V at 121*
Don't know if that helps
Don't know if that helps
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Thread Starter
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Laughing Gas
Joined: Aug 2008
Posts: 823
Likes: 5
From: Dallas, Oregon
Thanks Ray, that is just what I needed! I believe that the stock sender is not that accurate, so your variations are probably normal. I really want to know the voltage I should see at 200*, 210*, and 220* so I can compare what the X-Monitor says. Then I can use the X-Monitor reading as my redline.
The scientific way to do this would be to drop the solenoid body out of the tranny, hook the plug back up, and heat the unit in oil while measuing the temperature of the oil with a calibrated thermometer.
The scientific way to do this would be to drop the solenoid body out of the tranny, hook the plug back up, and heat the unit in oil while measuing the temperature of the oil with a calibrated thermometer.
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