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Intermittent fault on 940 2.0 turbo 1992

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Old Aug 17th, 2019, 21:04   #1
nigellazypostman
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Default Intermittent fault on 940 2.0 turbo 1992

Good evening everyone I am hoping i can pick your collective brains as I have a really annoying fault on my 940 2.0 turbo. Intermittently and more often than not the car will not start, I have checked the fault codes and am getting 223 and 224 this pointed me to the ECT which i have replaced but it hasn't made any difference whats confusing me is randomly the car will run great does any one have any advice on where to start troubleshooting?
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Old Aug 18th, 2019, 00:27   #2
Laird Scooby
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First, i hope you haven't thrown the original sensor away?

Second, unplug the new one, go for a drive - has the temp gauge stopped working? If so, you changed the wrong one!

The correct one is further back along the block.
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Old Aug 18th, 2019, 00:46   #3
Ian21401
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Default There are two sensors on my B200F.

Quite some time ago I was surprised when an older guy, but not quite as old as me, who had worked on 940s when they were new advised me that they had two engine coolant temperature sensors. One talks to the instrument panel engine temp. gauge and the other talks to the ECU.
On my B200F they are located on the left side of the engine under the induction mankfold. IIRC the one for the ECU is the one towards the rear of the engine and is the most difficult to access.
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Old Aug 18th, 2019, 01:32   #4
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Originally Posted by Ian21401 View Post
on the left side of the engine under the induction mankfold.
I don't normallly pick up on peoples typos Ian (i make enough of my own i have to confess!) but that one made me laugh! Thanks for that!

I would think the OP has a B200FT at a guess but the two coolant sensors are in the same place., hence my little test outlined in my post above.
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Old Aug 18th, 2019, 10:02   #5
nigellazypostman
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Thanks for responding guys, Just to confirm I have changed the harder to reach one from the back of the engine rather than the one at the front which controls the temperature gauge. I have also kept the old one just incase.

Does anyone have a wiring diagram so i can test the connectivity if i understand correctly there are three connectors ground thought the block and then two wires off to ........
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Old Aug 18th, 2019, 10:16   #6
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Does anyone have a wiring diagram so i can test the connectivity if i understand correctly there are three connectors ground thought the block and then two wires off to ........
.............. the LH-Jetronic 2.4 ECU and the ignition ECU. This is assuming the correct sensor has been supplied!

In the sensor for the temp gauge, there is no earth connection through the case on the sensor, it is simply a thermistor between the two terminals.

On the engine ECU temp sensor, there are two thermistors, one end of each is commoned to earth and the other ends respectively go to the terminals on the sensor.

http://www.myvolvolibrary.info/Tech_...Y94_Wiring.pdf

Assuming you have a cat on your car, that should be the nearest i can find.

Out of curiosity, what brand sensor did you buy?
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