LexDM3
Veteran Member
...the transmission and vehicle speed sensors seem to be working. I'd love some help on this.
Disclaimer: This is on a 2003 1.8T Jetta Wolfsburg automatic, not a TDI. I posted this question on VWVortex and got no replies. As a twice TDI owner ('02 Golf and '10 JSW), I know TDIers are knowledgeable and helpful. So thanks for any help you can provide.
I'm helping a friend of mine with her 2003 Jetta Wolfsburg 1.8T automatic. The speedometer shows no speed and the odometer doesn't change.
I did some researching and thought it might be the Vehicle Speed Sensor but there are other possible sensors too. Rather than dive into it myself, I took it to a good independent VW mechanic the other day. He told me that all the sensors read fine but nothing is getting to the cluster.
I did some checking on the road after that using my VCDS system and have determined:
- The cruise control works fine so the engine computer must be getting valid speed information.
- Running VCDS "Output Tests" on the instrument panel moves the Speedo needle properly.
- VCDS Module 02-Auto Transmission "Measuring Blocks 01 and 03" show two real non-zero speed measurements and a valid transmission speed while the car is moving. Interesting that they are different but I think the transmission is sending good speed info.
https://www.dropbox.com/s/000dt2xfxz...%20OK.jpg?dl=0
- However 46-Central Convenience "Measuring Blocks 06" shows 0.0 km/h speed when the car is moving.
https://www.dropbox.com/s/w1qx1eswc7...speed.jpg?dl=0
- And 17-Instruments "Measuring Blocks 01" also shows 0.0 km/h speed when the car is moving.
https://www.dropbox.com/s/9fc745q1ox...speed.jpg?dl=0
Any ideas what the problem might be? The guy who looked at it today thinks it might be a connection problem between the ECU and instrument panel. I pulled and cleaned the big ECU connector. No change. I haven't tried to clean the cluster connector yet. Doesn't look like fun to get to...
Could it be that the transmission speed sensor is sending the right information but the Vehicle Speed Sensor isn't? The fact that the cruise control works would seem to rule that out but maybe I'm wrong on that.
I'm an Electrical Engineer and can dive into this if needed. Thanks for any suggestions.
NOTE: See the three VCDS "Measuring Blocks" screen shots by clicking on the URLs above.
Disclaimer: This is on a 2003 1.8T Jetta Wolfsburg automatic, not a TDI. I posted this question on VWVortex and got no replies. As a twice TDI owner ('02 Golf and '10 JSW), I know TDIers are knowledgeable and helpful. So thanks for any help you can provide.
I'm helping a friend of mine with her 2003 Jetta Wolfsburg 1.8T automatic. The speedometer shows no speed and the odometer doesn't change.
I did some researching and thought it might be the Vehicle Speed Sensor but there are other possible sensors too. Rather than dive into it myself, I took it to a good independent VW mechanic the other day. He told me that all the sensors read fine but nothing is getting to the cluster.
I did some checking on the road after that using my VCDS system and have determined:
- The cruise control works fine so the engine computer must be getting valid speed information.
- Running VCDS "Output Tests" on the instrument panel moves the Speedo needle properly.
- VCDS Module 02-Auto Transmission "Measuring Blocks 01 and 03" show two real non-zero speed measurements and a valid transmission speed while the car is moving. Interesting that they are different but I think the transmission is sending good speed info.
https://www.dropbox.com/s/000dt2xfxz...%20OK.jpg?dl=0
- However 46-Central Convenience "Measuring Blocks 06" shows 0.0 km/h speed when the car is moving.
https://www.dropbox.com/s/w1qx1eswc7...speed.jpg?dl=0
- And 17-Instruments "Measuring Blocks 01" also shows 0.0 km/h speed when the car is moving.
https://www.dropbox.com/s/9fc745q1ox...speed.jpg?dl=0
Any ideas what the problem might be? The guy who looked at it today thinks it might be a connection problem between the ECU and instrument panel. I pulled and cleaned the big ECU connector. No change. I haven't tried to clean the cluster connector yet. Doesn't look like fun to get to...
Could it be that the transmission speed sensor is sending the right information but the Vehicle Speed Sensor isn't? The fact that the cruise control works would seem to rule that out but maybe I'm wrong on that.
I'm an Electrical Engineer and can dive into this if needed. Thanks for any suggestions.
NOTE: See the three VCDS "Measuring Blocks" screen shots by clicking on the URLs above.