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Old September 30th, 2010, 01:04 PM   #1
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Default troubleshooting?

I'm looking at buying an 87 4 runner soon the gas gauge doesn't work I would assume its the sending unit but I'm not firmilair with toyota so I figured I would ask in case it could be a common problem and just be a fuse or a short thanks for any help
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Old September 30th, 2010, 06:45 PM   #2
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more than likely the sending unit....15 bux @ yodajims + shipping
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Old September 30th, 2010, 07:03 PM   #3
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like any other problem, you can go by the "usualy is.." and the "most likely" answers, and start throwing money and parts at it till something sticks, or you could get a schematic, make a few tests, and buy the right part the first time and actually fix the problem.

going by the schematic at MeL, you will find 2 wires at the sender, 1 brn and one ylw/red. First test the brn wire for continuity to ground, and if that is good, then jump it to the ylw/red wire. Turn the key on, and with the wires jumped togethor, the guage should read full scale (pegged). If the guage does move, then remove and bench test/replace the sender.
If it does not, then you need to start testing at the guage itself. First off, get to the back of the guage, but leave it connected. Test for pos voltage at the red/wht wire (should be fine, since it feeds everything else as well) then test for ground at the brn wire (which is also the ground for the temp guage). If both of those are good, then test continuity across the ylw/red wire between the sender and the guage. If all tests till this point are good, assume the guage is the problem.
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