The Speedometer receives the data for all 4 gauges and then passes it along to the others. I took a picture that shows the connection on to the Rev counter which then passes it to the fuel and Temp Gauges, which are out of shot.
The Speedometer is on the left of the picture with the yellow connector which receives the signals, the other connector with 3 wires out goes to the Rev counter that has 3 in and 3 out which go to the Fuel and then Temp.
The Speedometer receives the data for all 4 gauges and then passes it along to the others. I took a picture that shows the connection on to the Rev counter which then passes it to the fuel and Temp Gauges, which are out of shot.
The Speedometer is on the left of the picture with the yellow connector which receives the signals, the other connector with 3 wires out goes to the Rev counter that has 3 in and 3 out which go to the Fuel and then Temp.
Hope this helps.
Thank, Just realised its a GDI so different wiring to earlier plus 4 and lots more things controlled by ecu. Hope it works out ok.
I guess it would be handy to know whether the displays receive data direct from each of their remote sensors and then pass it on to the ECU for interpretation in terms of engine management, or indeed if it is the ECU that receives the data directly from the sensors, after which it then passes it out to the various instruments for display purposes. Either way any break in comms either to or from the ECU would seem to add potential for confusion, though the hope might be that the ECU would be pre-programmed with fault codes to aid tracking down any such issue... But then... Perhaps not...?
More than happy for my thinking be proven entirely wrong... Again...Duh..!
The Speedometer receives the data for all 4 gauges and then passes it along to the others. I took a picture that shows the connection on to the Rev counter which then passes it to the fuel and Temp Gauges, which are out of shot.
The Speedometer is on the left of the picture with the yellow connector which receives the signals, the other connector with 3 wires out goes to the Rev counter that has 3 in and 3 out which go to the Fuel and then Temp.
Hope this helps.
Can I assume engine fuse 3 and its 12 volt feed out to instruments on purple/red wire has been thoroughly checked?
Assuming it has, without VDO instrument info it's difficult to be sure but all instruments affected by your fault are driven by CANBUS data. Thoughts then are that the Speedo receiveing this data first is just a means of daisy chaining and data passed on isn't processed by same. Poor connections aside I wonder therefore if its worth unplugging each instrument by way of testing
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone
The Speedometer receives the data for all 4 gauges and then passes it along to the others. I took a picture that shows the connection on to the Rev counter which then passes it to the fuel and Temp Gauges, which are out of shot.
The Speedometer is on the left of the picture with the yellow connector which receives the signals, the other connector with 3 wires out goes to the Rev counter that has 3 in and 3 out which go to the Fuel and then Temp.
Hope this helps.
Can I assume engine fuse 3 and its 12 volt feed out to instruments on purple/red wire has been thoroughly checked?
Assuming it has, without VDO instrument info it's difficult to be sure but all instruments affected by your fault are driven by CANBUS data. Thoughts then are that the Speedo receiveing this data first is just a means of daisy chaining and data passed on isn't processed by same. Poor connections aside I wonder therefore if its worth unplugging each instrument by way of testing
that was my thought too…but as a dealer has been involved, one might think (or hope?) they know what they’re doing! 🧐
Some years back I used to work on some large machinery that utilised a Graphic User Interface...(-: Doncha just love the way manufacturers like to use their own language to make kit seem special...? The GUI connected to modules spread out over the length of the machinery and communication on a token ring network, which I suspected was not a lot different from can bus comms... Faults were caused by module failures, open circuits in the wiring, occasionally caused by poor connections points or shots in the wiring all of which could be diagnosed with a voltmeter, and as you suggest john, by unplugging modules individually and checking for the effect of doing so.. The diagnostic tool to use was a digital voltmeter. All of which had me go off in search of some info on can bus, which seems to be very similar system when it comes to fault finding..
I found this YT vid which kinda confirmed my thinking and might hopefully help..
The Speedometer receives the data for all 4 gauges and then passes it along to the others. I took a picture that shows the connection on to the Rev counter which then passes it to the fuel and Temp Gauges, which are out of shot.
The Speedometer is on the left of the picture with the yellow connector which receives the signals, the other connector with 3 wires out goes to the Rev counter that has 3 in and 3 out which go to the Fuel and then Temp.
Hope this helps.
Can I assume engine fuse 3 and its 12 volt feed out to instruments on purple/red wire has been thoroughly checked?
Assuming it has, without VDO instrument info it's difficult to be sure but all instruments affected by your fault are driven by CANBUS data. Thoughts then are that the Speedo receiveing this data first is just a means of daisy chaining and data passed on isn't processed by same. Poor connections aside I wonder therefore if its worth unplugging each instrument by way of testing
So 1st thing is the dealer confirmed availability from the factory yesterday and due to our impending 18 night trip to Spain, I told them to get one sent out. This started Sept. 2023 and I've got to the stage where I'm prepared to just throw some money at it.
Hi Richard, I did check the fuse, actually took the opportunity to clean all of them, can't say the connection has been thoroughly tested ( not sure what that would entail ) but continuity is fine, when tested.
Due to the intermittent nature, doing anything 1 dial at a time isn't feasible and I'm not convinced it would be worth it. Example is our last trip that confirmed all the cleaning hadn't worked. During a 2 day trip with an overnight in Harrogate, the 1st day showed no sign of the issue, the next day we went over to York via The Motorist, the issue only reoccurred on the way home from York. Also over time the issue has changed slightly, it starts with all 4 dials dying at the same time but we have also observed some individual dials dying or groups such as fuel and temp. NB. All observations are while driving and the dials recover usually within seconds but sometimes a few minutes.
I don't expect to have enough running to confirm a fix until we are well into our trip, I won't be convinced it's gone for a while after that and I'm not convinced the Speedometer will fix it. The only other thing I can think of is the ECU and/or the CAN/BUS signals.
I guess a bit of a long shot..but..finding a replacement instrument cluster complete from a vehicle dismantlers to swap over with your own, could be worth a try... ? OK, I will shut up now.
Hi Mark I know nothing about GDI cars but have found this manual for VDO CANcockpit instruments. Assuming these are the type fitted to your car you might find it useful for getting a bit more information on to how these instruments are interconnected and operate. On page 38 of this manual there is a description of the pointer positions of the gages under fault conditions ether zero or 6 degrees below that might be useful
![[Linked Image]](https://www.tm-img.com/images/2025/04/08/IMG_20250408_162254.md.jpg)
