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Registered
Join Date: Oct 2007
Location: Rye, New Hampshire
Posts: 374
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How can I test my Speedo sensor?
Speedometer stopped working recently. I had the engine and tranny out recently and the speedo worked fine after replacing them... then died about a week later.
I'm thinking it's the pulse sensor on the transmission for the speedo. I've already reseated it a few times, cleaned it, and checked the connections in the box behind the seats... All seems as should be.. Is there any way I can test the sensor on the transmission before buying one to make sure it's the problem... Thanks Dan
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1979 Porsche 911 Black on Black widebody 3.2 - SOLD 2015 Jeep Wrangler Sport Unlimited - White 1984 Porsche 928s Black on Black - SOLD |
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04-21-2010, 04:44 AM
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Registered
Join Date: Apr 2009
Location: Cape Vincent, NY
Posts: 841
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An analog multimeter works great as you can see the needle sweep with the pulses. You can also use an oscilloscope if you have one. I would not recommend a digital multimeter as they rarely have a fast enough response time to show the pulses accurately.
I wonder of a tach/dwell meter could be used as well? IIRC there are four trigger points per revolution so a tach meter should pick it up just like a 8-cylinder motor. Would have to check the circuit tho to be sure.
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1968 911S "Leona" Air goes in and out, blood goes round and round, any variation on this is a bad thing. |
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04-21-2010, 06:32 AM
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