Sensor Ground (Signal Ground)
A sensor ground is a dedicated return path from a sensor to the control unit.
What is Sensor Ground (Signal Ground)?
It is kept separate from high-current grounds. A poor sensor ground distorts signals. Several sensors may share one ground. A voltage drop of more than a small fraction of a volt between the sensor ground and the control unit ground indicates a problem. Measuring with the circuit operating gives the most reliable result.
How it works
The control unit compares the sensor signal against this ground.
Why it matters for your car
Check ground voltage drop when signals look wrong. A shared bad ground can trigger many codes at once.
Other terms
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