Component Inspection

Component Inspection

1. Ignition "OFF".
2. Disconnect wheel speed sensor connector.
3. Measure resistance between terminal "1,2" of the wheel speed sensor connector.
A. Specification : Approx. 1.385 Kohms. ± 110 ohms




4. Is the measured resistance within specifications ?
YES
1) Go to "Component Waveform Inspection" procedure.
NO
1) Substitute with a known-good Wheel speed sensor and check for proper operation. If problem is corrected, replace Wheel speed sensor and then go to "Verification of Vehicle Repair" procedure.

Component Waveform Inspection

1. Lift the vehicle.
2. Ignition "ON".
3. Turn the wheel by hand.
4. Measure waveform between terminal "2" of the wheel speed sensor harness connector and chassis ground.
A. Specification : If the figure of the waveform isn't contorted and the width of the waveform is uniform,
It is in normal condition.




5. Is the measured waveform within specifications ?
YES
1) Fault is intermittent caused by poor connection in wheel speed sensor harness (FL) and/or external noise.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage, interferance between harnesses. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
2) If OK, Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU and then go to "Verification of Vehicle Repair" procedure.
NO
1) 1) Check for improper installation of wheel speed sensor. If NG, repair as necessary and then go to "Verification of vehicle Repair" procedure.
2) Check for damage of rotor teeth or wheel bearing. If NG, repair as necessary and then go to "Verification of vehicle Repair" procedure.
3) Substitute with a known-good Wheel speed sensor and check for proper operation. If problem is corrected, replace Wheel speed sensor and then go to "Verification of Vehicle Repair" procedure.