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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Speedometer quit

Old 03-12-2019, 10:56 AM
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Speedometer quit

How do you tell if it's the cluster or the speed sensor? It's always had an issue with the speedo flipping back and forth when I turn the turn signals on, but now its completely quit. It did the fluttering deal for a few days and now its completely dead.
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Old 03-12-2019, 11:17 AM
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I assume you've already determined that you HAVE a VSS1 speed sensor in the back of the transfer case (in the olden days, the speedometer was cable driven, VSS1 was in the Combination Meter (cluster), and the speedometer itself was entirely mechanical). You can find the procedure for testing the sensor here: http://web.archive.org/web/200901240...e/combinat.pdf

Back when my sensor went south, I worked out that procedure without the help of the manual, but I checked it in the other direction. I hooked a signal generator to the disconnected lead from the sensor, and confirmed the speedometer worked when fed a simulated signal. I doubt you have a signal generator.
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Old 03-12-2019, 12:59 PM
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what year is your 3rd Gen?
Thought some of the early ones, maybe 89-90 had mechanical speedo's
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Old 03-12-2019, 01:32 PM
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The '93 FSM still describes the mechanical speedometer, so I don't think it is as simple as model year. I've never been able to discern a pattern, though.
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Old 03-12-2019, 05:37 PM
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Mine is a 94. I assumed it had a speed sensor....and we all know how that goes. I'll check for one tomorrow
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