Does a 46rh transmission have a temperature oil fluid sensor?

The blue arrow is pointing to it in the first diagram.

This was the last year for the OBD1 emissions system, and you can see the fault code descriptions leave a lot to be desired. If you read the codes by cycling the ignition switch, with which Chrysler made doing that yourself much easier than any other manufacturer, all you'll get is code # 37, then you have to take some voltage readings to see which definition applies. If your code reader gives you the definition on its readout, you need to list the exact definition you got. They mean very different things.

Also, I post this multiple times per week, but this is the first time I saw it in a service manual. At the top of the first page of fault codes it says, "Diagnostic trouble codes do not necessarily identify failed component". My description is "diagnostic fault codes never say to replace a part or that one is defective. When a sensor or other part is referenced in a fault code, it is only the cause of that code about half of the time. First we have to rule out wiring and connector terminal problems, and mechanical problems associated with that part before we spend our customer's money on that part".

This is especially true with temperature sensors. They have an extremely low failure rate because they have just one component inside them. By far you're more likely to find the sensor is unplugged or the wire is cut, (sensor voltage too high), or its wire is grounded, (sensor voltage too low).

If you're using a scanner, or if your code reader can display live sensor data, read the transmission sensor voltage, otherwise you'll need to use a voltmeter to do that right at the sensor, but to be valid, that must be done with the sensor plugged in. The computer feeds it with 5.0 volts, then the sensor draws that down to develop its signal voltage. The acceptable limits for that signal voltage is roughly between 0.5 and 4.5 volts, give or take a little. Anything outside that range is what triggers a fault code. It's almost impossible for the sensor element to do that. These defect-indicating voltages, (0.0 or 5.0 volts) can only be caused by a wiring problem;... Well, 99.99 percent of the time. I'm told to never say "never".

Let me know what you find or if you need more help. I have the diagnostic charts formatted for posting for all three code definitions if you need them.

I know these are hard to read, but these diagrams are the aftermarket version of the transmission control system. It's the same for the 46RH and the 42RH. There's two points of confusion, however. I did find a drawing that shows the transmission temperature sensor at the left side of the transmission, near where the neutral safety switch lives, but there's no reference to that on any diagrams. These both show it as being in one of the cooler lines attached by the radiator. Here it's shown in the cooler line also, but right by the transmission.

The second thing that confuses me is they're showing the sensor as a variable resistor, (which makes sense for detecting and setting fault codes), but here it's in series with a warning light. Those are normally switched with a thermally-controlled on / off switch. Those can't set a fault code because there are the only two states it can be in, and both are acceptable.

What did you get for the fault code, a number "37" or an actual description?

That's on an AC line.