How to find values for CLT Coolant Temp Sensor?

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
Forum rules
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.

If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).

If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days

The full forum rules are here: Forum Rules, be sure to read them all regularly.
Post Reply
spudmurphy
MegaSquirt Newbie
Posts: 4
Joined: Wed Mar 01, 2006 5:12 am
Location: Lancashire, UK

How to find values for CLT Coolant Temp Sensor?

Post by spudmurphy »

I've done a few searches now and know where to input the values into my MS-II for the coolant temp sensor but cant find an idiots guide for how to get these values :(

I'd like to retain the sensors that came with the car a 1997 renault clio as the recomended GM parts are not easily available in the UK as far as I can tell. I have 2 different sensors to try one is a Siemens made sensor with a part # of 1430-1 154-91 and the other seems to be made by elbi (?) and has a part # of TRC-200 on it. I cant find anything online that has the resistance values recorded.

I have ice in the freezer and a pan of water bubbling away and a multimeter at the ready but I'm struggling with what to measure. If I put the multimeter across the 2 pins of the sensors it looks like an open circuit, so should I be reading a voltage drop across the 2 pins?

Please help as I have managed the physical build of this so far but electronics are not my strongest point and I'm on a steep learning curve.

Many thanks,

Spud
All these new words are starting to make me feel a little bit sick.
Top
MurrayA4
MegaSquirt Newbie
Posts: 1
Joined: Thu Sep 29, 2005 3:27 am
Location: Lac Brome Quebec - Canada

Post by MurrayA4 »

Spud I'll use as reference the CLT values for the Bosch CLT sensor in my 1986 Alfa GTV6.Its resistance values are as follows:

- 20 deg.C = 9500 ohms
+20 deg.C = 2500 ohms
+80 deg.C = 350 ohms

If you are seeing open circuit at room temperature either you meter settings are incorrect or your sensor is no good.You should be able to track down some temp./resistance values for your sensors somewhere on the web ?
Top
jonny5_6977
MegaSquirt Newbie
Posts: 6
Joined: Tue May 09, 2006 2:59 pm
Location: crete il
Contact:
Contact jonny5_6977

Post by jonny5_6977 »

well if you have the setting on the meter right and leads in the right holes then you probly got a temp switch not a thermisitor. temp switchs are usally used for cooling fans. i would take a closer look around the coolant outlet of the head or near it for another sensor and test that. also you may try going repair shop and see if they have service information for that car or go to the dealer and ask them "how to test it to see if its good" or tell them your temp gauge dosent work and what sensor would cause that and if they have one in stock, ask them to see it and where its located on the motor. make them think you are going to buy it or more parts. dealers will be more giving on the info if you are going to buy from them.
Top
Post Reply

Return to “Wiring and Sensors”