Peugeot 306 1.6 temperature sensors

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Mon 18 Dec 2006 22:16
Peugeot 306 1.6 temperature sensors - nick62
Can anyone please give me some guidance as to the values of resistance for the GREEN (ECU) and BROWN (FAN CONTROL) temperature sensors on a 1999 1.6i petrol 306?

At the moment they are as folllows:

Hot (engine at normal working temp) green=250 ohms, brown=2800 ohms

20 C (approx), green=2500 ohms, brown=1800 ohms

So from these readings I summise that the green one is a NTC type, (resistance DECREASES with a rise in temperature) and the brown one is a PTC type, (resistance INCREASES with a rise in temperature).

I ask because the petrol consumption seems to have increased noticably over the last couple of weeks and I know these can be the cause (because the ECU thinks the enginge is cold and overfuels it all the time).

There is also a THIRD sensor (behind the water pump) but it remember it is a French car!

Any links to a good Peugeot technical website will be welcomed also.

Nick
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Mon 18 Dec 2006 22:24
Peugeot 306 1.6 temperature sensors - LeePower
Green temp sensor is for the engine ECU & this is the one that controls the fueling.

Deep 19mm socket & around £12 new from the dealer.

Blue temp sensor is for the temp gauge on your dash.

Brown temp sensor is for the cooling fans, aircon ( if fitted ) Bitron system, STOP & HIGH temp warning lights.

There you go ;-)
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Mon 18 Dec 2006 22:35
Peugeot 306 1.6 temperature sensors - Screwloose
Nick

The important one, the green, is reading about right. 2,500 ohms is indeed around 20C and 250 ohms corresponds to approx 85C.

Have you checked that any of the brakes aren't binding? That can have a marked effect on fuel-consumption. If the engine was over-fuelling, you'd get a "long-term fuel trim" code appear in the ECU and the MIL light would illuminate.
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