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September 07, 2010, 01:51:37 PM
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Pages: 1 [2]
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Author
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Topic: Digital Dash pin wiring diagram (Read 475 times)
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Hadmatt54
One cylinder
Posts: 23
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A ground is a ground most of the time....unless it goes through a resistance! If you look at any electronic sensing circuit that comes back to a control unit, the circuit is actually switched on the ground. Years ago if you wired up lights in a North American Vehicle, power went through a fuse, to a switch, to the light and then to ground, but the Japanese changed all of that, power in Japanese circuits flows from the fuse, to the light, to a switch, which actually completes the ground circuit when the switch is turned on.
In sensing circuits the ECU will send out 5 volts through a variable resistance and the resulting voltage that flows back to the ECU to ground tells the ECU what is actually going on with that particular sensor.
I believe that this fuel gauge is the same, the digital control is looking for that return path in order to determine what position the sending unit is in the tank. There may be nothing wrong with your sending unit at all.
There are ways to test it in the FSM but it's two pages and I don't have a scanner handy today. Most of the tests require a voltmeter and a 3.4 watt 12v. bulb. Some specifically require an analog dc voltmeter,
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Hadmatt54
One cylinder
Posts: 23
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That's Great!!!
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Hadmatt54
One cylinder
Posts: 23
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All of the info that I gave you came from my 86 Toyota FSM and my 86 Toyota Wiring Diagram manual. I don't have a scanner home and I haven't been near one at work..Sorry, I couldn't help you there, but a FSM for your truck is never a bad purchase anyway!
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PunchinPreacher
Newbie
Posts: 9
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C17 and C8, goto the light control rheostat...
Do these two go to the rheostat and from there ground?
I cant find them in my 86 ewd.
Thanks!
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Pages: 1 [2]
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