So about a year ago I fired the coupe up after sitting through a typically crappy new England winter and I discovered the speedometer was dead. Tach works and so does everything else but not the speedo or odometer.
What should I check and in what order?
Trouble shooting dead speedo on 85 m636
Moderators: GRNSHRK, ron, bfons
- Pat_M635csi
- Posts: 50
- Joined: Wed Dec 11, 2013 9:28 pm
- Location: Boston
Trouble shooting dead speedo on 85 m636
1985 M635CSI M88/3
1997 Z3 2.8
2010 535xi Touring w/Dinan Stage 3 upgrade
following were sold but not forgotten
2000 540it
1972 3.0CS Polaris
1972 3.0CSI Polaris
1986 735i 5sp
1983 733i
1969 2000 tilux
1972 2002 tii
1973 2002
1997 Z3 2.8
2010 535xi Touring w/Dinan Stage 3 upgrade
following were sold but not forgotten
2000 540it
1972 3.0CS Polaris
1972 3.0CSI Polaris
1986 735i 5sp
1983 733i
1969 2000 tilux
1972 2002 tii
1973 2002
-
- Platinum Member
- Posts: 3726
- Joined: Thu Apr 08, 2004 3:24 pm
- Location: Gilroy (SF Bay Area) CA
Moderator will move this thread . . .
Bobbo
1980 633 CSi Cypress Green/Pearl Beige
2017 X5 M Sport Xdrive 35i Carbon Black/Ivory White
2005 330 Ci ZHP Cabrio Imola Red/Bone/Black
first thing is to check the pulse generator at the diff and the wiring to it.
IIRC you should test for volts first; one wire should read ~12V. The other wire should look like a ground connection.
The pulse generator should look like a switch that goes open-closed-open-closed- etc as the road wheels (and propshaft) are turning.
cheers
IIRC you should test for volts first; one wire should read ~12V. The other wire should look like a ground connection.
The pulse generator should look like a switch that goes open-closed-open-closed- etc as the road wheels (and propshaft) are turning.
cheers
~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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- Platinum Member
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Moderating the Workshop . . .
Hey Ron, appears that there are no moderators for the Workshop, strangeI'm unable to moderate in the "Workshop" section. Have mentioned this to Brian before.
Lemme ping my bro the true web master, let's see what he's got to say about that
Bobbo
1980 633 CSi Cypress Green/Pearl Beige
2017 X5 M Sport Xdrive 35i Carbon Black/Ivory White
2005 330 Ci ZHP Cabrio Imola Red/Bone/Black
- Pat_M635csi
- Posts: 50
- Joined: Wed Dec 11, 2013 9:28 pm
- Location: Boston
Speedo - Thanks
I will take a shot at it this weekend
1985 M635CSI M88/3
1997 Z3 2.8
2010 535xi Touring w/Dinan Stage 3 upgrade
following were sold but not forgotten
2000 540it
1972 3.0CS Polaris
1972 3.0CSI Polaris
1986 735i 5sp
1983 733i
1969 2000 tilux
1972 2002 tii
1973 2002
1997 Z3 2.8
2010 535xi Touring w/Dinan Stage 3 upgrade
following were sold but not forgotten
2000 540it
1972 3.0CS Polaris
1972 3.0CSI Polaris
1986 735i 5sp
1983 733i
1969 2000 tilux
1972 2002 tii
1973 2002