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Speed Sensor Testing
The 944 workshop manual says that you can test the speed and reference sensors with and oscilloscope but I am wondering if anyone has tried to test the speed sensor using a digital multimeter and reading the RMS voltage that comes from the sensor when the engine is cranked. The manual says that you should see a 2.5 Volt peak-to-peak voltage displayed on the oscilloscope screen. I'm assuming that measuring this signal with a multimeter and looking for a .884 Vrms signal instead would produce the same test results. Has anyone tested the sensor in this way?
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'87 944 |
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09-30-2009, 06:00 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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I haven't tried this, but it should work. The only thing that might be a issue is that it is sometimes difficult to measure very low (<1V) AC voltages with a multimeter. And most multimeters measure average, not RMS, AC voltage - not that it would make much of a difference though.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) Last edited by wild man; 10-09-2009 at 10:57 AM.. |
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10-09-2009, 10:49 AM
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