Originally Posted by
Old Farang
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[TD]The Coolant Temperature Sensor should change resistance with heat, per the following specs:
- 10 c ....................9,100 - 9,300 ohms
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0 c.........................5,700 - 5,900 0hms
20 c.......................2,400 - 2,600 ohms
40 c.......................1,100 - 1,300 ohms
60 c........................500 - 700 ohms
80 c........................300 - 400 ohms
100 c.......................150 - 200 ohms
The Coolant Temperature sensor is used to enrich the fuel mixture whenthe engine is cold. These devices almost always fail open-circuit, which makesthe injection system believe that the engine is at somewhere around–40 degrees Centigrade. The system will always detect this as a faultcondition, and use a substitute value of 30 degrees Centigrade whilstsetting a fault code in the ECU. In practice, thismeans that the car will be difficult to start when cold (too lean), andwill be too rich when warmed up. However, it will usually get home!
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These sensors are still available and not expensive. p/n: ETC8496. If a faulty sensor is replaced it will be necessary to clear the fault in the ECU either by unplugging it, or disconnecting the battery for a few seconds.
