How does the voltage in a wheel sensor vary?

How does the voltage in a wheel sensor vary?

This voltage will vary according to the speed in which the hub or wheel is spun. As the hub begins to spin the voltage will rise and then decrease as it stops. Slowly spin the hub or axle which will produce the voltage, if no readings can be found the sensor has failed and replacement is required. This is a typical reading from a wheel sensor.

How does the ABS wheel speed sensor work?

Now the sensor is ready to be tested. While observing the voltmeter spin the wheel or hub to create voltage. This voltage will vary according to the speed in which the hub or wheel is spun. As the hub begins to spin the voltage will rise and then decrease as it stops.

What is the 5V reference circuit voltage drop?

If the 5V reference circuit (in-series) limiting resistor, for example, is 50 ohms and the sensor is 25,000 ohms, then the amperage would be .000199A, or 199µA. The clamp-on amp meter will not be able to measure amperage that low. Also, the voltage drop across the limiting resistor (50 ohms) is around .009V.

Where to test for a 5V reference circuit problem?

The easiest place to start testing is at one of the engine sensors (MAP, TPS, etc.). When you confirm that the 5V reference circuit is dead, you need to locate the source of the problem.

This voltage will vary according to the speed in which the hub or wheel is spun. As the hub begins to spin the voltage will rise and then decrease as it stops. Slowly spin the hub or axle which will produce the voltage, if no readings can be found the sensor has failed and replacement is required. This is a typical reading from a wheel sensor.

Now the sensor is ready to be tested. While observing the voltmeter spin the wheel or hub to create voltage. This voltage will vary according to the speed in which the hub or wheel is spun. As the hub begins to spin the voltage will rise and then decrease as it stops.

Is the amperage on a 5V reference circuit too low?

Some people will argue that the amperage on a 5V reference circuit is too low to measure. That’s basically true, under normal conditions. However, if a sensor or one of the wires becomes shorted to ground, then that wire will have a small but measurable amount of amperage.

What does a 5 volt reference signal mean?

Photo 2: The ECT sensor consists of a 5-volt reference, a variable thermistor, and a signal return wire to the ECM. As you might suspect, this was a no-code problem that had bewildered two previous shops. If I recall, one shop replaced the idle air control (IAC) and another replaced the oxygen sensor because the exhaust “smelled rich.”