The importance of Engine Grounds
On any computer controlled engine,
The ground system is critical.
The operating voltage of most sensors, is 5
volts. If you have a bad ground, you will
feed extra voltage back into the sensors
through the ground. You can actually
measure this very easily with a voltmeter.
Connect the Black (-) lead to the battery
negative post and the red (+) lead to a
ground any place on the car. You can check
the chassis, the motor, alternator, wiper
motor, especially any ground wires bolted
to the engine, any thing that should be
grounded. If you get more than .5 volt you
will have a big problem. I aim for .05 or less.
If you are pushing .5 volt back into a 5-volt
system, your information to the computer
will be way off.
Another source of voltage to check for is
the Radiator!
If your antifreeze gets acidic, it can turn
your radiator into a battery. You can check
this the same way, black lead ground to
battery then just put the red lead into the
radiator, if you get a voltage reading you
need to neutralize the cooling system.
Grounds and splices can be problem areas,
a program like Alldatadiy, takes a lot of
guess work out of finding the exact location
to look for your problem.
MrWrench
On any computer controlled engine,
The ground system is critical.
The operating voltage of most sensors, is 5
volts. If you have a bad ground, you will
feed extra voltage back into the sensors
through the ground. You can actually
measure this very easily with a voltmeter.
Connect the Black (-) lead to the battery
negative post and the red (+) lead to a
ground any place on the car. You can check
the chassis, the motor, alternator, wiper
motor, especially any ground wires bolted
to the engine, any thing that should be
grounded. If you get more than .5 volt you
will have a big problem. I aim for .05 or less.
If you are pushing .5 volt back into a 5-volt
system, your information to the computer
will be way off.
Another source of voltage to check for is
the Radiator!
If your antifreeze gets acidic, it can turn
your radiator into a battery. You can check
this the same way, black lead ground to
battery then just put the red lead into the
radiator, if you get a voltage reading you
need to neutralize the cooling system.
Grounds and splices can be problem areas,
a program like Alldatadiy, takes a lot of
guess work out of finding the exact location
to look for your problem.
MrWrench
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