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The BMW Range
5 Series
E39
ASC&ABS light on, gear wont shift, speedo not working
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<blockquote data-quote="leforte" data-source="post: 259965" data-attributes="member: 1943"><p>FIRST have the car hook up to a diagnostic tool and scan for errors, almost all will show up on the scan. and always start trouble shooting with the least expensive part, dont go shooting off to the mech telling him its the ABS controller, abs module... you are just inviting for your throat to be cut from the mech.</p><p></p><p>the symptoms describe above is most likely due to a shorted speed sensor. So check on your REAR wheel speed sensor. this are the sensors that provide the reading for the speedo and automatic gearbox EGS module. its also connected to the 4 wheel ABS circuit. </p><p></p><p>chances are that the the wires are cracked and frayed thus causing a short to the circuit. this is a predominant failure part due to the exposure to the elements and caustic brake dust. the trans failure light could be emitted due to a burn fuse/relay for the EGS unit when the wires shorted. </p><p></p><p>although the wire are shorted and may look burned, the sensors will still be ok as these are fully sealed passive components. it can be salvage and for a simple fix, you may repair the wire as with any wire connection with some length of wires, soldering iron and heat shrink tubing. on my previous e36, the repaired leftside wires lasted longer than the one that was replaced. </p><p></p><p>however should you decide to replace the entire sensor, do some precautionary step by shielding the wire from elements with some length of tape or best if you could seal the entire length with heat shrink tubing acting like a extra skin.</p></blockquote><p></p>
[QUOTE="leforte, post: 259965, member: 1943"] FIRST have the car hook up to a diagnostic tool and scan for errors, almost all will show up on the scan. and always start trouble shooting with the least expensive part, dont go shooting off to the mech telling him its the ABS controller, abs module... you are just inviting for your throat to be cut from the mech. the symptoms describe above is most likely due to a shorted speed sensor. So check on your REAR wheel speed sensor. this are the sensors that provide the reading for the speedo and automatic gearbox EGS module. its also connected to the 4 wheel ABS circuit. chances are that the the wires are cracked and frayed thus causing a short to the circuit. this is a predominant failure part due to the exposure to the elements and caustic brake dust. the trans failure light could be emitted due to a burn fuse/relay for the EGS unit when the wires shorted. although the wire are shorted and may look burned, the sensors will still be ok as these are fully sealed passive components. it can be salvage and for a simple fix, you may repair the wire as with any wire connection with some length of wires, soldering iron and heat shrink tubing. on my previous e36, the repaired leftside wires lasted longer than the one that was replaced. however should you decide to replace the entire sensor, do some precautionary step by shielding the wire from elements with some length of tape or best if you could seal the entire length with heat shrink tubing acting like a extra skin. [/QUOTE]
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The BMW Range
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E39
ASC&ABS light on, gear wont shift, speedo not working
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