ABS Wheel Speed Sensors

On the vehicle that you have been assignment does it use analogue or digital wheel sensors?

Analogue

How did you conclude that the wheel speed sensors were analogue or digital?

The Sensors produced an AC waveform making it analogue and had 2 wires

Measure the air gap for each wheel sensor.

State the air gap and the visual condition of each wheel sensor.

Front Right: Gap of 0.152mm, Sensor had accumulated brake dust and dirt on it.

Front Left: Gap of 0.152mm also, as well as brake dust and dirt on the sensor

Rear Right: Sensor is covered

Rear Left: Sensor is covered

Using an oscilloscope connect it to a wheel sensor and record the pattern shown, If the sensor is a Analogue sensor then just connect then probe and spin the wheel. If the sensor is digital you will need to have the iginition on before you turn the wheels.

This pattern is analogue

Using the frequency scale on a multi-meter. Turn the wheel at proximately the same speed as in the above test. Note the frequency and compare it to the graph you drew above.

Frequency: 125.30Hz

No observations

Using a Scan Tool

Using a scan tool go to the ABS live data screen and note all the sensors, data and what it is telling

• Left Front WSS 0 km/h
• Right Front WSS 0 km/h
• Left Rear WSS 0 km/h
• Right Rear WSS 0 km/h
• Brake Switch
• FL Hold Solenoid Command: Off
• FL Hold Solenoid Feedback: Off
• FL Release Solenoid Command: Off
• FL Release Solenoid Feedback: Off
• FR Hold Solenoid Command: Off
• FR Hold Solenoid Feedback: Off
• FR Release Solenoid Command: Off
• FR Release Solenoid Feedback: Off
• RL Hold Solenoid Command: Off
• RL Hold Solenoid Feedback: Off
• RL Release Solenoid Command: Off
• RL Release Solenoid Feedback: Off
• RR Hold Solenoid Command: Off
• RR Hold Solenoid Feedback: Off
• RR Release Solenoid Command: Off
• RR Release Solenoid Feedback: Off

Using the scan tool on the vehicle you have assigned to. Go to the actuator test screen. Note below what component you have tested and what happened when you tested that component and the test results.

This information could not be obtained.