Toyota Tercel 1984-1994 Repair Guide

Speed Sensors

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TESTING



Front Speed Sensors

See Figures 1, 2 and 3

  1. Remove the fender shield.
  2.  
  3. Unplug the speed sensor connector.
  4.  
  5. Measure the resistance between the terminals. It should be between 0.92-1.22 k-.
  6.  
  7. Check that there is no continuity between each terminal and the sensor body.
  8.  



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Fig. Fig. 1: Measure the resistance between the sensor terminals

  1. Replace the sensor if the conditions are not as specified.
  2.  
  3. Engage the electrical connection, then install the fender shield.
  4.  
  5. Remove the front driveshaft. Refer to the appropriate procedure in this repair guide.
  6.  
  7. Inspect the sensor rotor serrations on the end of the driveshaft for scratches, cracks, warping or missing teeth. Replace, as applicable.
  8.  
  9. Install the driveshaft.
  10.  



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Fig. Fig. 2: Check that there is no continuity between the terminals and the sensor body



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Fig. Fig. 3: Check the sensor rotor serrations on the halfshaft for damage

Rear Speed Sensors

See Figures 4 and 5

  1. Remove the rear seat cushion.
  2.  
  3. Unplug the speed sensor connector.
  4.  
  5. Measure the resistance between the terminals. It should be between 0.9-1.3 k-. Replace the sensor if resistance is not as specified.
  6.  
  7. Check that there is no continuity between each terminal and the sensor body.
  8.  



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Fig. Fig. 4: Measure the resistance between the sensor terminals

  1. Replace the sensor if the conditions are not as specified.
  2.  
  3. Engage the electrical connection, then install the rear seat cushion.
  4.  
  5. Remove the brake drum. Refer to the appropriate procedure in this repair guide.
  6.  
  7. Inspect the sensor rotor serrations for scratches, cracks, warping or missing teeth. Replace, as applicable.
  8.  
  9. Install the brake drum.
  10.  



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Fig. Fig. 5: Check the rotor serrations on the hub of the brake drum for damage

REMOVAL & INSTALLATION




CAUTION
On models equipped with a Supplemental Restraint System (SRS) or "air bag,'' work must NOT be started until at least 90 seconds have passed from the time that both the ignition switch is turned to the LOCK position and the negative cable is disconnected from the battery.

Front Sensors

See Figures 6, 7, 8 and 9

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the fender shield, then unplug the electrical connection.
  4.  



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Fig. Fig. 6: Front speed sensor installation



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Fig. Fig. 7: Unplug the front speed sensor electrical connection. This is usually hidden under the fender shield

  1. Remove the clamp bolts and clip securing the sensor harness to the body and shock absorber.
  2.  
  3. Remove the speed sensor from the steering knuckle.
  4.  

To install:
  1. Install the speed sensor to the steering knuckle. Tighten to 69 inch lbs. (7.8 Nm).
  2.  
  3. Engage the sensor electrical connection. Tighten the sensor harness bolts to 48 inch lbs. (5.4 Nm).
  4.  
  5. Install the fender shield.
  6.  



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Fig. Fig. 8: Remove the speed sensor harness bolts



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Fig. Fig. 9: Remove the bolt securing the speed sensor to the steering knuckle

Rear Sensors

See Figures 10, 11, 12 and 13

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rear seat cushion.
  4.  



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Fig. Fig. 10: Rear speed sensor installation

  1. Unplug the sensor connector, then pull out the sensor wire harness with the grommet.
  2.  
  3. Remove the bolts securing the harness to the suspension arm.
  4.  
  5. Remove the sensor attaching bolt, then remove the sensor.
  6.  

To install:
  1. Install the speed sensor. Tighten to 69 inch lbs. (7.8 Nm).
  2.  
  3. Pass the sensor harness through the body panel, then engage the electrical connection.
  4.  
  5. Install the grommet securely.
  6.  
  7. Tighten the sensor harness bolts to 48 inch lbs. (5.4 Nm). Install the rear seat cushion.
  8.  



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Fig. Fig. 11: Remove the seat cushion, then unplug the electrical connection for the rear speed sensor



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Fig. Fig. 12: Remove the harness clamp bolts



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Fig. Fig. 13: Remove the bolt securing the speed sensor

 
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