Difference between revisions of "Coolant Temperature Sensor (CTS)"
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This matches a thermistor with characteristics of R0=2700 ohms and Beta=3977 such as [http://uk.farnell.com/jsp/Passive+Components/Resistors,+Thermistors+&+Potentiometers/VISHAY+BC+COMPONENTS/238164055272/displayProduct.jsp?sku=1187038 this one for £1.42] but you'll need a package (~£50?) to put it in. | This matches a thermistor with characteristics of R0=2700 ohms and Beta=3977 such as [http://uk.farnell.com/jsp/Passive+Components/Resistors,+Thermistors+&+Potentiometers/VISHAY+BC+COMPONENTS/238164055272/displayProduct.jsp?sku=1187038 this one for £1.42] but you'll need a package (~£50?) to put it in. | ||
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| + | Having discussed this with some Esprit owners, and with reference to their parts manual EMH.4, it turns out they have the same CTS thermistor characteristics {as well as the same [[ECM]]}. Their part number is A910E6928F and is available from [http://www.sjsportscars.co.uk/partsandaccessories/srchRes.asp?Car_ID=8&Type1_ID=5&srch=A910E6928F&Submit=search SJ sportscars for ~12GBP] whereas ours is [http://www.sjsportscars.co.uk/partsandaccessories/srchRes.asp?Car_ID=9&Type1_ID=5&srch=A100E6373S&Submit=search closer to 50GBP]! This is unhelpful though at the present time (2008) as they are on backorder and Lotus "can't find a replacement". | ||
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| + | [http://www.lotuselancentral.com/forum/viewtopic.php?t=5287 ESM did some research] and found data for the [http://www.mindspring.com/~fierosketch/osg/coolant-sensor.html Pontiac Fiero] has the same CTS thermistor characteristics. Cross referencing with a US parts site [http://www.partsamerica.com/ProductList.aspx?PartType=290&PTSet=A Parts America] gives several options for the 1988 Fiero CTS. This site is useful in that you can view a part and then see which vehicles it fits. The Fiero CTS is common with the Isuzu Impulse RS and Geo Storm (as suspected but I don't think it has been proven until now) and more importantly for UK owners, a car available in the UK - the Isuzu Trooper (1986-7 with 2.3l engine and 1992-2001 with 3.2l & 3.5l V6 engines) as originally suggested by ESM. | ||
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| + | They have been sourced from Vauxhall for ~15GBP with the ACDelco part number 25036979. | ||
Revision as of 23:43, 19 February 2008
Lotus part number A100E6373S is the Coolant Temperature Sensor (CTS) which reports the engine coolant temperature to the ECM. It consists of a thermistor in a sealed package which screws into the thermostat housing.
Thermistors are negative temperature coefficient devices and from the Lotus parts manual EMK.4, the Elan has the following characteristics:
Temp(°C) / Resistance(ohms)
100 / 185
70 / 450
38 / 1800
20 / 3400
4 / 7500
-7 / 13500
-18 / 25000
-40 / 100700
This matches a thermistor with characteristics of R0=2700 ohms and Beta=3977 such as this one for £1.42 but you'll need a package (~£50?) to put it in.
Having discussed this with some Esprit owners, and with reference to their parts manual EMH.4, it turns out they have the same CTS thermistor characteristics {as well as the same ECM}. Their part number is A910E6928F and is available from SJ sportscars for ~12GBP whereas ours is closer to 50GBP! This is unhelpful though at the present time (2008) as they are on backorder and Lotus "can't find a replacement".
ESM did some research and found data for the Pontiac Fiero has the same CTS thermistor characteristics. Cross referencing with a US parts site Parts America gives several options for the 1988 Fiero CTS. This site is useful in that you can view a part and then see which vehicles it fits. The Fiero CTS is common with the Isuzu Impulse RS and Geo Storm (as suspected but I don't think it has been proven until now) and more importantly for UK owners, a car available in the UK - the Isuzu Trooper (1986-7 with 2.3l engine and 1992-2001 with 3.2l & 3.5l V6 engines) as originally suggested by ESM.
They have been sourced from Vauxhall for ~15GBP with the ACDelco part number 25036979.
