Thread: Operating Temperature
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Old 26th November 2019, 09:15   #43
SD1too
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Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

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Originally Posted by T-Cut View Post
Completely different principle I'm afraid. The 75/ZT systems, including the temperature gauge, operate digitally. This means 'electronic data' are sent over shared, multichannel 'buses' rather than by the old analogue, electromechanical way.
The 75/ZT systems are actually partially digital, this principally being intercommunication between ECUs (including the instrument pack). Otherwise there are still a large number of electromechanical and analogue devices to be found. In the case of the temperature gauge, the 75/ZT's coolant sensor is a thermistor (just like the part fitted to David's SD1 built over thirty years ago). Its output is analogue as far as the ECM.

Simon
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