DaveT Posted October 30, 2020 Share Posted October 30, 2020 This is my collection of measurements of the CTS. temp sensor ohms 14F 7000 - 11500 68F 2000-3000 122F 700-1000 Above are from the FSM. Below are actual measurements. Done at 2 different times, compiled here. The 1990 unit was in a good running engine. The new dealer unit was bought locally, and I made the measurements before installing it to get the extra reference points. measured ohms temp 1990 used new dealer unit 77F - 2390 122F 1154 1098 185F - 400 190F 454 - More measurements from some runs in 2020 - Temps measured with a Fluke62 max+ IR thermometer. Voltages while running, connected to the ECU with a Fluke 77 Multimeter. Ohms after / before, while off, connected to ECU, same meter. temp ohms volts 79F 1108 2.73V - 1130 2.79V 77F 1139 2.81V 193F 259 .680V - 262 .714V - 268 .735V 192F 242 .652V Quote Link to comment Share on other sites More sharing options...
somick Posted October 30, 2020 Share Posted October 30, 2020 Thank you Dave! 1 Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 31, 2020 Share Posted October 31, 2020 (edited) That is a standard Bosch/GM NTC (thermistor) resistance value. You can use any $20 GM sensor in it's place. For example: https://www.amazon.com/ACDelco-213-77-Original-Equipment-Temperature/dp/B000C9JS5C Or a Bosch unit (metric): https://www.bosch-motorsport.com/content/downloads/Raceparts/en-GB/53687307119081483.html#/Tabs=53698955/ Bosch also lists the values along with it. REALLY common stuff when you are doing standalone EFI setups and tuning. These are used everywhere - coolant temp, manifold temp, intake air temp, etc. They have brass, plastic, open element.... anything you could want and they are CHEAP. Bosch essentially set all these standards back in the 70's, GM adopted them along with a lot of Bosch components and rolled them into their Rochester Fuel Systems products and a couple billion GM products were built with Rochester (Bosch) injectors, temp sensors, and other bits. Subaru just copied GM because that's what they could buy cheap and it was essentially industry standard (and in many cases still is). GD Edited October 31, 2020 by GeneralDisorder 3 Quote Link to comment Share on other sites More sharing options...
Ionstorm66 Posted November 1, 2020 Share Posted November 1, 2020 19 hours ago, GeneralDisorder said: That is a standard Bosch/GM NTC (thermistor) resistance value. You can use any $20 GM sensor in it's place. For example: https://www.amazon.com/ACDelco-213-77-Original-Equipment-Temperature/dp/B000C9JS5C Or a Bosch unit (metric): https://www.bosch-motorsport.com/content/downloads/Raceparts/en-GB/53687307119081483.html#/Tabs=53698955/ Bosch also lists the values along with it. REALLY common stuff when you are doing standalone EFI setups and tuning. These are used everywhere - coolant temp, manifold temp, intake air temp, etc. They have brass, plastic, open element.... anything you could want and they are CHEAP. Bosch essentially set all these standards back in the 70's, GM adopted them along with a lot of Bosch components and rolled them into their Rochester Fuel Systems products and a couple billion GM products were built with Rochester (Bosch) injectors, temp sensors, and other bits. Subaru just copied GM because that's what they could buy cheap and it was essentially industry standard (and in many cases still is). GD Just to add they are plain jane 2.2K thermistors in side. If you look up a chart for one they match right up with the values for sensor. Quote Link to comment Share on other sites More sharing options...
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