I have a MS I version 3 board. Since installing it, the cooling fans do not come on by themself. If I unhook the wire from MS that is tapped into the stock ECU harness the fans will come on when the engine gets hot, however then I don't have a coolant reading to MS...
My MS has a 2.49K resister in the R7 spot. I did search and came up with contradicting thoughts. Some posts say that if you are T-ing into the stock ECU wire for CLT temps, you should not have a biased resistor on the MS board in R7.
So, trying to get MS to read a proper temp, and still have my fans controlled by the stock ECU, I used a second temp sensor. My car is a 96, but I have a 93 coolant passage where the CTS screws in (so I have two diffrent CTS). So I decided to use a second CTS dedicated to MS. The Sensor that was there already has a diffrent resistance value than the one the stock ECU uses. So I pulled it out, and put in a second CTS of the same type the stock ECU uses. Wired one side to ground, and the other to the MS wire harness. But now the temps in MS are diffrent!
Do I need to change the resistor in R7 when not T'd in to the stock ECU?
If so, does anyone know of hand what resitor I should use?
I tried to edit the values using Easytherm, but had very bad luck. I put in the values I got by taking ohm readings at diffrent temps. 44, 70, and 200 degrees, had easytherm create new inc and s19 files, then tried to download the s19 file to the MS box. After doing that, and then reloading my MSQ, the temps were still off... Far off.
Thanks all for you help!
My MS has a 2.49K resister in the R7 spot. I did search and came up with contradicting thoughts. Some posts say that if you are T-ing into the stock ECU wire for CLT temps, you should not have a biased resistor on the MS board in R7.
So, trying to get MS to read a proper temp, and still have my fans controlled by the stock ECU, I used a second temp sensor. My car is a 96, but I have a 93 coolant passage where the CTS screws in (so I have two diffrent CTS). So I decided to use a second CTS dedicated to MS. The Sensor that was there already has a diffrent resistance value than the one the stock ECU uses. So I pulled it out, and put in a second CTS of the same type the stock ECU uses. Wired one side to ground, and the other to the MS wire harness. But now the temps in MS are diffrent!
Do I need to change the resistor in R7 when not T'd in to the stock ECU?
If so, does anyone know of hand what resitor I should use?
I tried to edit the values using Easytherm, but had very bad luck. I put in the values I got by taking ohm readings at diffrent temps. 44, 70, and 200 degrees, had easytherm create new inc and s19 files, then tried to download the s19 file to the MS box. After doing that, and then reloading my MSQ, the temps were still off... Far off.
Thanks all for you help!
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