Reference Voltage (5 V Supply)
Reference voltage is the stable supply, usually 5 V, that the control unit sends to many sensors.
What is Reference Voltage (5 V Supply)?
Sensors return a varying signal between 0 and 5 V. Several sensors may share one reference circuit. A short on one sensor can pull the reference down for all. Measuring the reference at the sensor connector with the ignition on is a quick first check. A value near zero suggests a short or broken feed; a value near battery voltage suggests a short to power. Ground circuits for sensors are often shared as well.
How it works
The control unit regulates the voltage precisely.
Why it matters for your car
Multiple sensor codes at once can point to a reference fault. Unplug sensors one by one to find the short.
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