nevins Posted January 27, 2011 Share Posted January 27, 2011 This is an odd one. The speedo read in mph before the problem. The speedo has dropped out and odo not counting up. The car has no converter fitted on it any where that I can see. The car is a jspec so obviously there should be one some where. Places I have searched so far are , inside dash, centre console, with ecus's, under with the box. All the wiring is untouched, as in not spliced into any where. I have tried another set of clocks in the car and still nothing. Continuity has been checked along the wires and is fine. All the wiring in intact, I have removed the sensor and checked resistance across it and it read 0.33 ohms. Does anyone know if this reading is correct or is it a case of the sensor breaking down and not giving out a signal. Thanks Gareth Quote Link to comment Share on other sites More sharing options...
nevins Posted January 28, 2011 Author Share Posted January 28, 2011 Bump. Anyone know what resistance the sensor should be holding static. Quote Link to comment Share on other sites More sharing options...
stevie_b Posted January 28, 2011 Share Posted January 28, 2011 (edited) I thought the sensor signal is a pulsed signal, giving 4 pulses per roadwheel revolution. I may be wrong though. If I'm right, it would mean pulses are sent along the wire according to the sensor's proximity to specific points (magentic?) on the wheel. For such a set-up, I'm not sure that measuring the static resistance of the sensor will tell you much. You'd need an oscilloscope to see the pulses. Edited January 28, 2011 by stevie_b (see edit history) Quote Link to comment Share on other sites More sharing options...
nevins Posted January 28, 2011 Author Share Posted January 28, 2011 Thats correct but, the sensor will have a resistance no matter what. If the resistance is not as specified by manufacturer its a good chance it is shafted. The only figure I have found so far is 560-680 ohm. Can some one confirm if this is correct, as the one in question is reading 0.33 ohms which I think is the main problem but need something to compare to. Thanks Gareth Quote Link to comment Share on other sites More sharing options...
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