ecu speed sensor

tommmtom

tommmtom

hi guys!
can anyone give me any info on the speed sensor that goes to the ecu from the speedo. I don't have a speedometer so don't have the speed sensor for the ecu. I need to have one now to get speed readings through my ecuTalk so hoping to fix something up. At the moment i have a reed switch that is triggered every time the speedo gear in the gbox turns. is this how the speed sensor works? if so i can just feed my reed switch signal into the ecu!
cheers guys
 
The ecu doesn't need a speed signal to work. Disconnected mine. You need to work out the hz/speed ratio before you can do anything with the signal.
 
I don't have it connected now and it all runs well. Speedo cable is going into a homemade thing that earth's every rotation of the cable for the electronic speedo I'm using to detect speed and works fine. But now I've got an ecuTalk lcd display on the way and that works out speed, distance and MPG from the ecu speed sensor input! So need to figure out what if the ecu is looking for a voltage from a hall sensor or something, or simply a magbetic switch sorta thing (like bicycle speedo pickus)
 
I think its resistance it measures (probably to earth) through a sensor on the back of the clocks that varies as the needle moves? Input comes from the dash clocks at any rate, and I don't think it is accurate in the slightest.
 
Here is a thought. Why don't you remove your manual speedo drive in the gearbox and install an electronic speedo gear in the gearbox and hook up the wires. This will give you a signal for your ECU Talk.
 
if its manual drive loom there will be no plug for it so ecu won't register the signal.
 
tbh, I don't really think any of em do... maybe the motronics? Only speedo input on the mechanical speedo cars is a single wire to ecu, but dunno what it reads. Could be a pulsed signal like the electric sender unit on later gb's I guess, but not got anything to hand to measure and drive at the same time. Ed would know.
 
pulsed output then... guess it does read speed :) Or at least makes decisions based on certain speed criteria. It may only be able to tell basic things, like x<V or x>V
 
Could still be hard wired control rather than logic control, in which case you might not have a useable number to pull off the consult.
 
Enuo said:
Could still be hard wired control rather than logic control, in which case you might not have a useable number to pull off the consult.
Click to expand...
i just tested it on consult/ecutalk software andy, and you get an accurate and progressive speed readout :) (albeit in km)
 

Similar threads

Skrilla
ABS wheel speed sensor replace
Replies
0
Views
505
Skrilla
Skrilla
smidge
speed sensor..
Replies
7
Views
2K
smidge
smidge
Skrilla
ABS Wheel speed sensor 98 preface
Replies
0
Views
410
Skrilla
Skrilla
O
Gearbox oil via speed sensor
Replies
10
Views
3K
mrcheese
mrcheese
M
Speed Sensor. Part No 250106F600
Replies
3
Views
2K
mswin341
M
Back
Top