Oil Pressure Sender Test
#1
Oil Pressure Sender Test
Hey Guys,
Does anybody know how to test the output of the oil pressure sender with a multimeter?
I know it's somehow based on resistance, but it's only got one wire, so I'm a little confused.
I'm trying to track down why my oil pressure gauge stopped working, and I know that it's either the sender, the wire, or the gauge. I figure since I've got a multimeter I could test the sender and get it out of the way first.
GSL-SE Addict? Kentetsu? Anybody?
Jon
Does anybody know how to test the output of the oil pressure sender with a multimeter?
I know it's somehow based on resistance, but it's only got one wire, so I'm a little confused.
I'm trying to track down why my oil pressure gauge stopped working, and I know that it's either the sender, the wire, or the gauge. I figure since I've got a multimeter I could test the sender and get it out of the way first.
GSL-SE Addict? Kentetsu? Anybody?
Jon
#2
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The OP sender is just a variable ground, based on pressure. The higher the pressure, the lower the resistance will be.
I can't quote the resistance values, but I'm sure they would be listed in the FSM.
I can't quote the resistance values, but I'm sure they would be listed in the FSM.
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Yea, you should be able to just measure resistance between the one wire and ground. If I remember right, the factory service manual shows what resistances to use to test the gauge, so you can just use those as the values that the sending unit should read at a given pressure.
Rich
Rich
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Just in case anyone wants to know, the fine white wires wrapped around the bar on the back generate heat as current flows through them. The "bar" is actually a bi-metal strip. Metals expand at different rates, so when you put two of them together and heat them, the strip bends toward the one that expands the least. This strip is connected to the needle on the gauge, so as it bends, the needle moves.
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Originally Posted by 64mgb
Just in case anyone wants to know, the fine white wires wrapped around the bar on the back generate heat as current flows through them. The "bar" is actually a bi-metal strip. Metals expand at different rates, so when you put two of them together and heat them, the strip bends toward the one that expands the least. This strip is connected to the needle on the gauge, so as it bends, the needle moves.
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Rich
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ok im having a similar issue but its with the temp gauge.
i have a positive wire on one terminal and the sender hooked up to the other.
is there some relay i am missing because after running for a minute on a cold engine the gauge goes goes all the way to hot. i have tried multiple senders and gauges with the same results.
i have a positive wire on one terminal and the sender hooked up to the other.
is there some relay i am missing because after running for a minute on a cold engine the gauge goes goes all the way to hot. i have tried multiple senders and gauges with the same results.
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Originally Posted by trochoid
Temp gauges can fail the same way the op ones do. In your case, I would venture a guess that the sender wire is grounding somewhere.
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so on the gauge i have 2 post where do the wires run?
right now i have a positive wire from the battery and the other going to the sender.
it works but registers too hot, not reading the right temps.
like i say i am using all good known parts and have tried multiple combos with same results. something is not right with my wiring.
right now i have a positive wire from the battery and the other going to the sender.
it works but registers too hot, not reading the right temps.
like i say i am using all good known parts and have tried multiple combos with same results. something is not right with my wiring.
#15
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I haven't looked at the back of the cluster circuit board for a while, but doesn't the connections for the gauge come through the board itself? Other than a couple of plugs, most of the cluster inputs comes through the 2 round gang plugs. Each of the pinouts are listed in the FSM.
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