dead speedo

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Jun 28, 2008 | 04:34 PM

why165

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dead speedo

ok i have a dead speedo and a flashing od of light. looks to me to be simple enough, dead vss. took that out and cleaned it with no effect. the question is what is the test for the vss to make sure it is bad before i buy another one? thankyou

2000 f-350 crew cab 7.3

Jun 28, 2008 | 07:14 PM

F350-6

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From: Texas

A new VSS is around $30. The only way I know of to test them is to swap it with another truck to see if that fixes the problem.

Jun 28, 2008 | 09:52 PM

mueckster

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From: Damon (South East Texas)

I have a sensor tester that uses LED lights to test different sensors and ignition modules. The test leads are connected to the prongs on the VSS (with the plug removed) and the ring gear is turned. The LEDs flash with VSS voltage pulses. You can also do this with an analog or digital volt-ohm meter and set it on a low AC voltage setting. Look for fluctuations, up and down, of the voltage while turning the ring gear. I usually use an analog type at work with it set on 1 volt AC and see a movement about 1/3 to 1/2 scale.

Jun 28, 2008 | 09:58 PM

zx250

Of the next Riffraff East

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From: Concord NC

Whew! I thought this was another OT thread, maybe one about a loose fitting swim suit or something.

Jun 28, 2008 | 10:29 PM

why165

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thankyou for the quick replies, i guess i will just buy another vss this one only has 240000 miles or so on it.

Jun 28, 2008 | 11:47 PM

clintbonnie

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Joined: Jun 2003

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From: Ardenvoir, Washington

Quote:

Originally Posted by why165

thankyou for the quick replies, i guess i will just buy another vss this one only has 240000 miles or so on it.

My VSS went bad a couple of years ago and i got one from Napa , P/N 530780 for $10.49.. solved the problem.. (they called it a ABS sensor).. If you continue to have problems, you might consider changing out the rear-end fluid. Metal flakes i think affect the sensor..