Rear ABS Wheel-Speed Sensor Inspection
REAR ABS WHEEL-SPEED SENSOR INSPECTIONInstallation Visual Inspection
1. Inspect the following items:
^ If there is any malfunction, replace the applicable part.
(1) Excessive looseness or play of the ABS wheel-speed sensor
(2) Deformation of the ABS wheel-speed sensor
(3) Deformation or damage of the ABS sensor rotor
Clearance Inspection
1. Verify the clearance between the ABS sensor rotor and the ABS wheel-speed sensor.
^ If there is any malfunction, check for improper installation, and replace if necessary.
Clearance
0.3-1.1 mm (0.012-0.043 inch)
Resistance Inspection
1. Measure the resistance between the ABS wheel-speed sensor terminals.
^ If there is any malfunction, replace the ABS wheel-speed sensor.
Standard
1.3-1.7 kilohms
Voltage Pattern Inspection
1. Lift up the vehicle, and connect an oscilloscope to the ABS wheel-speed sensor connector.
2. While rotating each wheel by hand inspect the voltage pattern.
^ If there is distortion or noise, inspect the sensor rotor.
Voltage pattern (reference)
^ Oscilloscope setting: 1 V/DIV (Y), 2 ms/DIV (X), AC range
^ Vehicle condition: Driving 30 km/h (18.6 mph)
Note
^ As the vehicle speed increases, the voltage increases and the wave period shortens.
Sensor Output Value Inspection
1. Turn the ignition switch off.
2. Connect the M-MDS to the DLC-2.
3. Select the following PIDs using the M-MDS:
^ LR_WSPD (LR wheel-speed sensor)
^ RR_WSPD (RR wheel-speed sensor)
4. Start the engine and drive the vehicle.
5. Verify that the display of the M-MDS shows the same value as the speedometer.
^ If there is any malfunction, replace the ABS wheel-speed sensor.