nickm Posted June 15, 2009 Share Posted June 15, 2009 Anyone know what part I need to change to get my speedo working correctly its a 97 300tdi auto, doesnt jump about at all just reads completely wrong Done a 450 mile journey last week but the trip counter was upto 500 miles speedo reading is a lot higher than the actuall speed some thing like 20 is 30 30 is 45 40 is 55 50 is 70 65 is 80 Cheers Nick Nick Quote Link to comment Share on other sites More sharing options...
disco_al Posted June 15, 2009 Share Posted June 15, 2009 first, are you running standard or oversize tyres? on that age, it is an electronic sende unit, bolted to the back of the transfer housing, where the cable would usually go. could be that playing up. Quote Link to comment Share on other sites More sharing options...
nickm Posted June 15, 2009 Author Share Posted June 15, 2009 first, are you running standard or oversize tyres? on that age, it is an electronic sende unit, bolted to the back of the transfer housing, where the cable would usually go. could be that playing up. All completely standard, would you know of a part number ? Quote Link to comment Share on other sites More sharing options...
teabag Posted June 15, 2009 Share Posted June 15, 2009 All completely standard, would you know of a part number ? AMR1253 Transducer Speed 571665 O ring-seal transducer Quote Link to comment Share on other sites More sharing options...
nickm Posted June 16, 2009 Author Share Posted June 16, 2009 Cheers Teabag Does £40 sound about right found a couple sh*tpart ones for that price or £60 for genuine ones Ta Quote Link to comment Share on other sites More sharing options...
Aragorn Posted June 16, 2009 Share Posted June 16, 2009 I dont think its the transducer. Its the kinda thing that either works or doesnt, i've never heard of a faulty transducer simply reading low, they usually give sporadic or jumpy readings or just die all together. I'd be looking at the speedo drive gear in the transfer box (ie is it correct), or the speedo head itself. Quote Link to comment Share on other sites More sharing options...
cipx2 Posted June 16, 2009 Share Posted June 16, 2009 The differences between the actual and indicated speeds are not proportional all the way through so it's not a matter of tyres, gears, diff ratios etc. Could be a poor/oxidized contact or something like that that gives parasitic signals. Like the mouse I ditched not long ago which double clicked instead of single click on the left button. nickm, before buying a new sensor try to clean it carefully, maybe you're lucky. Edit: see http://forums.lr4x4.com/index.php?showtopic=43162; Try to test it but you'll need to use a multimeter set on "diode" (audible continuity) - the indication on the display, on either digital or analog instruments, is not fast enough. Maybe you'll hear it 'double clicking'. Quote Link to comment Share on other sites More sharing options...
nickm Posted June 17, 2009 Author Share Posted June 17, 2009 Cheers Guys I'll have a go at cleaning all connection's before I buy a new one Quote Link to comment Share on other sites More sharing options...
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