|
700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
Information |
|
Speedo issuesViews : 920 Replies : 15Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Sep 24th, 2018, 21:01 | #1 |
New Member
Last Online: Nov 13th, 2018 14:31
Join Date: Sep 2018
Location: Amersham
|
Speedo issues
Hi guys my 1991 940 speedo isnt working. Ive checked and tightened all the screws on the back checked all the plugs. Everything else works apart from the speedo. I was told from the original owner that he had the sensor tested under the car and that was fine. Its got me completly stumped cheers.
|
Sep 24th, 2018, 21:35 | #2 |
VOC Member
Last Online: Aug 13th, 2023 17:49
Join Date: Aug 2016
Location: Aberdeen
|
Since you have a 91 car, like has a damaged speed circuit board, there is in brilliant guide in the FAQ that explains everything, but short story is the capacitors leak and cause issues, but you are lucky can change them and clean it up
__________________
1992 2.0 SE Turbo Wentworth, now with b230ft & M90 2005 S60 2.0T the baby T5 |
The Following 2 Users Say Thank You to Jebus For This Useful Post: |
Sep 24th, 2018, 23:14 | #3 |
bob12
Last Online: Today 14:05
Join Date: Aug 2006
Location: Woking
|
Your cluster and speedo will be OEM Yazaki so odds on it's the pcb within the speedo itself with blown capacitors.
|
The Following 2 Users Say Thank You to bob12 For This Useful Post: |
Sep 26th, 2018, 21:40 | #4 |
Premier Member
Last Online: Today 08:43
Join Date: May 2012
Location: Lakenheath
|
Does your car have ABS and if so, does the ABS warning light behave as it should? In other words, come on for a few seconds when the ignition is first switched on then go off and stay off?
If not, the fault could be somewhere in the ABS system as that is fed by the same sensor on the back axle. Also do your odometer and trip meter still work? If so it's almost certainly the capacitors in the speedo head.
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
The Following User Says Thank You to Laird Scooby For This Useful Post: |
Sep 29th, 2018, 16:30 | #5 |
Member
Last Online: Feb 17th, 2024 12:14
Join Date: Jun 2016
Location: NORTHWICH CHESHIRE
|
There is a company that repairs them link here https://www.autotronics.co.uk/volvo-...er-repair.html
__________________
|
The Following 3 Users Say Thank You to WUMPSTER For This Useful Post: |
Sep 30th, 2018, 16:26 | #6 | |
New Member
Last Online: Nov 13th, 2018 14:31
Join Date: Sep 2018
Location: Amersham
|
Quote:
|
|
The Following User Says Thank You to Mickyfinn121 For This Useful Post: |
Sep 30th, 2018, 17:30 | #7 |
Premier Member
Last Online: Today 08:43
Join Date: May 2012
Location: Lakenheath
|
Then the fault lies in your speedo head. What are you like at electronics?
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
The Following User Says Thank You to Laird Scooby For This Useful Post: |
Oct 9th, 2018, 21:12 | #8 |
Premier Member
Last Online: Feb 11th, 2023 20:32
Join Date: May 2010
Location: Blyth, Northumberland
|
Replaced the capacitors in mine. 1992 940.
Have a look at these:
http://www.brickboard.com/FAQ/700-90...sterRemovalAll and http://www.brickboard.com/FAQ/700-90...eterRepair.htm and the threads I started: Intermittent Speedo/Odometer Fault and Help Please re Speedometer Fault. My brother has spent most of his working life fixing PCBs and the stuff that is soldered to them so I obtained the capacitors and he replaced them for me. |
Oct 9th, 2018, 23:43 | #9 |
Master Member
Last Online: Mar 27th, 2024 20:43
Join Date: Dec 2011
Location: Surrey
|
Useful info as I'm having some issues with mine too.
Whats the likely issue with mine ? Diff sensor or PCB/Capacitor ? Its a '91 940 (so the Yakuzi unit) with the following symptoms..... Sometimes sticks at 36mph (or 46 depending on how its feeling) and the odometer and mileage stop dead BUT on occasion the numbers race round (a mile every 100 yards or so !) and it all catches up....sometimes all reads normal... Today the miles are being counted as normal and speedo is at 0.... Where do I go from here ? I'm using a Garmin as a speedo but I'd like to sort this.... |
Oct 10th, 2018, 00:04 | #10 | |
Premier Member
Last Online: Today 08:43
Join Date: May 2012
Location: Lakenheath
|
Quote:
It sounds very like a mechanical problem within the Yazaki speedo head, almost as if the drive motor is winding something up that is twisting until it pings out of whatever is preventing normal movement and then it adds the miles on faster and shows faster than you're really going. I'd say even if you changed the caps in it, you'd still have a problem, easiest way to fix it is buy a secondhand instrument cluster on fleabay or similar. Take before and after photos of the new and old togeher, new one sat on top of the dash showing the mileage and the old one in the dash showing the mileage. Change the clusters, put the old cluster on top and take another photo so the mileages can be seen. Then you can prove to whoever it wasn't done as a fraudulent way of reducing the mileage.
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
|
The Following User Says Thank You to Laird Scooby For This Useful Post: |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|