Front Speed Sensor

1. Remove screws and/or bolt retaining sensor wiring harness, if necessary. On all models except Supra, disconnect speed sensor connector at speed sensor. On Supra models, disconnect speed sensor connector in engine compartment.
2. On all models, measure resistance between terminals. On Supra and 1989 and 1991-92 Celica and 1989-91 Camry models, resistance should be 800-1300 ohms. On Previa and 1990 Celica and 1992 Camry models, resistance should be 920-1200 ohms. On Cressida models, resistance should be 1200-1600 ohms. On MR2 models, resistance should be 900-1500 ohms. If resistance is not as specified, replace sensor.
3. On all models, Ensure there is no continuity between each terminal and sensor body. If there is continuity, replace sensor.
4. Connect speed sensor connector and install sensor connector retaining screws and/or bolts.
5. Ensure sensor installation bolt is secure and torqued to specification. On Celica 4WD and 2WD, Camry and 1989-91 Cressida models, torque to 9 ft. lbs. On Supra and 1992 Cressida models, torque to 14 ft. lbs. On MR2, Pickup, 4Runner and 1991-92 Celica and Previa models, torque to 69 inch lbs.
6. On all models, visually inspect sensor rotor serrations by removing torque plate retaining bolts and torque plate with brake cylinder, then the disc.
7. Inspect sensor rotor serrations for scratches, cracks, warping or missing teeth.
8. Install rotor disc and brake assembly. On Celica and Previa with 2WD, Cressida and Camry 2WD models, torque bolts to 69 ft. lbs. On Celica and Previa with 4WD models, torque bolts 73 ft. lbs. On Supra models, torque bolts to 77 ft. lbs.