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testing speedo sensor, 940 900 1993

posted by  GAcyclops on  Sun Sep 20 16:07 CST 2009
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last visit: Sun Jun 29 13:55 CST 2014
[RELATED]

I've printed out the FAQ on speedo troubleshooting for the 900s, but must have missed something.

Is there a way to test the speedometer sensor in the differential, either in the diff or removed from it? I have a "test harness" made up that I could plug into the sensor, but not sure if that's the way to go.

My speedo & cruise are both dead, odometer too. All other gauges work fine.

I checked continuity between sensor connector and the connector from the back of the instrument cluster - it's OK

I also tried the "sensor bypass" trick - running jumpers from the sensor connector (unplugged from the sensor) and rapidly making/breaking the connection between the two, to simulate the action of the sensor.






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