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Forrest · Oct 27th, 2023, 20:02

I have tinkered with speedometer problems on several 940s over the years. All in my experience have been due to dry joints on the flimsy PCB on the back of the cluster. Whilst soldering has helped in the short term for a permanent repair I have always ended up replacing the cluster and transferring the speedometer instrument in order to retain the correct mileage.

There are a number of other things that can go wrong including the wiring near the speed sensor in the diff and capacitors in the actual instrument itself. Have a look at these links, if you haven’t already, for more information.

https://www.volvoclub.org.uk/faq/Ele...eterRepair.htm

https://www.volvoclub.org.uk/faq/Ele...ngeability.htm

https://www.volvoclub.org.uk/faq/Ele...anelRepair.htm

There is a multi-plug in the spare wheel compartment which will enable you to access the fuel gauge wiring. The two thinner wires. The thicker ones are for the in-tank pump. If you separate this connector you can test the resistance across the tank float. It should be in the range 40 to 300 ohms. If it’s vastly outside this the sender might be faulty. You could also try placing suitable resistors across the two thinner wires back to the gauge to test the gauge.

Oct 27th, 2023, 20:02	#4
Forrest VOC Member Last Online: Today 10:42 Join Date: Feb 2008 Location: Gloucester	I have tinkered with speedometer problems on several 940s over the years. All in my experience have been due to dry joints on the flimsy PCB on the back of the cluster. Whilst soldering has helped in the short term for a permanent repair I have always ended up replacing the cluster and transferring the speedometer instrument in order to retain the correct mileage. There are a number of other things that can go wrong including the wiring near the speed sensor in the diff and capacitors in the actual instrument itself. Have a look at these links, if you haven’t already, for more information. https://www.volvoclub.org.uk/faq/Ele...eterRepair.htm https://www.volvoclub.org.uk/faq/Ele...ngeability.htm https://www.volvoclub.org.uk/faq/Ele...anelRepair.htm There is a multi-plug in the spare wheel compartment which will enable you to access the fuel gauge wiring. The two thinner wires. The thicker ones are for the in-tank pump. If you separate this connector you can test the resistance across the tank float. It should be in the range 40 to 300 ohms. If it’s vastly outside this the sender might be faulty. You could also try placing suitable resistors across the two thinner wires back to the gauge to test the gauge.