v12 engine 4 coolant temperature senders - Mercedes-Benz Forum
 
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post #1 of 4 (permalink) Old 06-24-2019, 02:45 PM Thread Starter
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Date registered: May 2019
Vehicle: 1994 s600 coupe
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v12 engine 4 coolant temperature senders

there is a total of (4) coolant temperature sensors on the front water crossover of V12,
on my 1994 W140 coupe.
2 are identical, one on each side, and have 4 pins in each sensor
2 are in the middle of the engine, one has a single pin connector, the other has a 2 pin connector
I unplugged and cleaned all of them, all were somewhat corroded, the single pin connector was pretty bad. could barely unplug the single pin. had to spray it with PB blaster to get it off.
question- what do each of them do ?
I'm assuming they control the temperature gauge inside the car, and ground the o2 sensor circuits to put the engine in closed loop when it warms up, and also 1 or 2 may control the dual fans. what else ?
2nd question, which ones do what ?
now the big question, you can plug the 4 pin connector in 4 different ways. there's no guides on it. does it matter which way the plug goes into the 4 pins in the sensor ? just wondering why they would make a sensor that doesn't have guides so it only goes in one position. I'm leaving it how it was when I got it, but would like to know if there's a right or wrong way to plug it in.
any help appreciated, thanks- regards
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post #2 of 4 (permalink) Old 06-24-2019, 03:56 PM
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Date registered: Aug 2016
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On the 4 pins, it doesn't matter which way the connector goes. It has redundant sensors in it, arranged so the hookup orientation doesn't matter. They are for the fuel injection computers.

The two pin is for the fans. There is a complete description of how it works and modifications to allow the fans to turn on earlier, here:

https://www.k6jrf.com/MB_CTS.html

The mods work fine on the S600 also.

One pin is for the gauge.
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post #3 of 4 (permalink) Old 06-25-2019, 03:16 AM Thread Starter
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they mention a CTS and ECT sensor.
is the CTS the 2 pin, and the ECT the single pin ?
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post #4 of 4 (permalink) Old 06-25-2019, 04:28 AM
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STARtekinfo calls all of them ECTs.
http://manual.startekinfo.com
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