8809078

1.

Lift the vehicle.

2.

IG "ON".

3.

Turn the wheel by hand.

4.

Measure waveform between signal terminal of the wheel speed sensor harness connector and chassis ground with osciloscope.

Specification : High : 0.26~0.37V , Low : 0.13~0.18V

5.

Is the measured waveform within specifications?

▶ Fault is intermittent caused by poor connection in wheel speed sensor harness or external noise. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage and external noise, an interference between harnesses.

Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

▶ If there is no problem in signal circuit, 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.

note

※ In a case of replacing HECU, operate following functions

1) "HAC Enable/Disable" for HAC set. - ESP only

2) "Longituginal Sensor Calibration" for Longituginal sensor offset correction (refer to C1285) - ESP only

※ Above function should be preformed in order of precedence [1)→2)]

▶ 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.