Lift the vehicle.
Ignition "ON" & Engine "OFF".
Turn the wheel by hand.
Measure waveform between terminal "1" of the wheel speed sensor harness connector and chassis ground.
Specification : Approx. High : 1.05V , Low : 0.525V
Compare waveforms of all wheel speed sensors.
If they have same waveform, it is in normal condition.
Is the measured waveform within specifications?
YES
Fault is intermittent caused by poor connection in wheel speed sensor harness.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
If OK, Substitute with a known-good HECU and check for proper operation.
NO
Check the following point at wheel speed sensors which have abnormal waveform.
Check for improper installation of wheel speed sensor. If NG, repair as necessary and then go to "Verification of vehicle Repair" procedure.
Check for damage of rotor teeth or wheel bearing. If NG, repair as necessary and then go to "Verification of vehicle Repair" procedure.
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.
