Electrical Question
#1
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Join Date: May 2003
Location: Reno, NV
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Electrical Question
Using my Digital Meter, I get 6+ volts to the negative wires at my ECU...is this normal? Should negative not be 0 volts? Does this indicate a short or faulty sensor?
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#3
Former Moderator. RIP Icemark.
some of the circuits are 12v and some are 5 volt.
If you are measuring things like coil triggers or fuel injector tiggers wheil the car is running, they will often look like 6 volts AC (depending on the refresh speed of your meter).
If you are measuring things like coil triggers or fuel injector tiggers wheil the car is running, they will often look like 6 volts AC (depending on the refresh speed of your meter).
#4
RX-7 Alumni
You could also have a bad ground connection down stream of where you are measuring the 6v.
By default, a ground is 0V. even if you connect a 12v lead to ground, the 12v will be pulled to 0v (and a little fireworks I might add).
Small differences in ground can be acceptable, i.e. < 0.5v. Even then I would beef up the ground circuit to get everything at the same reference ground of 0V.
A short would not last, a fuse would blow. That is unless you are real lucky and short through some kind of load.
By default, a ground is 0V. even if you connect a 12v lead to ground, the 12v will be pulled to 0v (and a little fireworks I might add).
Small differences in ground can be acceptable, i.e. < 0.5v. Even then I would beef up the ground circuit to get everything at the same reference ground of 0V.
A short would not last, a fuse would blow. That is unless you are real lucky and short through some kind of load.
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