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Old 10-07-2015, 07:11 AM   #3
Croustibat
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Join Date: Aug 2011
Location: France - Toulouse
Age: 43
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Croustibat is an unknown quantity at this point
on S13 and S14, the speed signal goes from the sensor to the cluster, and is then transformed to go to the ECU. If there is no wiring problem, it means the cluster is not able to process the signal sent by the sensor.

Your options are either to get a sensor that fits, or to use a speedo-healer. These devices plug between the sensor and whatever electronics that comes after, and convert common speed / rpm signals into other signals.
If you know someone handy with electronics, he could probably build one for cheaper. You need a µcontroler with an ADC input and DAC/pwm output depending on the signal you want, a voltage regulator and a couple of capacitors.
On s13 and S14, I think the speedo converts the sine wave signal from the sensor to a square signal that goes to the ECU, but this is from the top of my head and maybe i am confusing it with another car, so you need to check this in the FSM, there is a section with diagnostics that will tell you that.
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