▶ 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 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.

▶ 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.