Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Speed Sensor

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SYSTEM TEST





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Fig. Typical Toyota wheel speed sensor

The following procedures require driving the vehicle while it is in the diagnostic mode. The anti-lock system will be disabled; only normal braking function will be available.

  1. If working on a 4WD vehicle, make certain it is only in 2WD. Check the battery voltage with the engine OFF ; voltage should be approximately 12 volts.
  2.  
  3. With the ignition switch ON , make certain the ABS warning lamp comes on for about 3 seconds and then goes out. Turn the ignition switch OFF .
  4.  
  5. Using a 3-way jumper, connect terminals Tc , Ts and E1 at the Data Link Connector (DLC1).
  6.  
  7. Pull the parking brake on securely and start the motor without stepping on the brake pedal. Depressing the brake pedal will either void the test or cause the system to enter a different diagnostic mode.
  8.  
  9. The dashboard warning lamp should flash evenly about four times per second. If, instead, a code is flashed, repairs must be made and the code(s) cleared before continuing. If the light does not flash, check the parking brake switch, the DLC1 connector and the wiring to the ABS controller.
  10.  
  11. To check the sensor signal level, release the parking brake and drive the vehicle straight ahead at low speed. Once a speed of 25 mph (38 km) is reached, the warning lamp should turn off. Once the light has gone off, it should begin to blink as the vehicle leaves the speed range. This blinking is normal and indicates the speed sensor is operating correctly. If no blinking occurs, the system is defective.
  12.  
  13. Check the sensor signal change by driving the vehicle on the road. Once a speed of 2531 mph (4050 km) is achieved, the warning lamp should come on after a one second pause. As before, the lamp should blink evenly as the vehicle leaves the speed range; failure to blink indicates a system fault.
  14.  

While the warning lamp is off, do NOT subject the vehicle to any shocks or impact such as shifting, acceleration, deceleration or road impact.

  1. Stop the vehicle in a safe location and apply the parking brake fully. Read and record any stored codes that are displayed.
  2.  
  3. Turn the ignition switch OFF ; remove the jumper wire from the DLC1 connector.
  4.  

COMPONENT TEST



Front Sensor


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Fig. Components of the front speed sensor

  1. Unplug the speed sensor connector.
  2.  
  3. Measure the resistance between terminals 1 and 2 . The resistance should be as follows:

    4Runner, Tacoma and Tundra: 1.41.8 kohms
     
    T100: 0.61.8 kohms
     
    Land Cruiser: 0.971.77 kohms
     

  4.  
  5. If the resistance is not as specified, replace the sensor.
  6.  
  7. Check that there is no continuity between each terminal and the sensor body. If there is continuity, replace the sensor.
  8.  
  9. Attach the speed sensor harness.
  10.  
  11. Check the installation of the sensor. If the mounting bolt is loose, tighten it to 69 inch lbs. (8 Nm).
  12.  
  13. Remove the axle hub with the rotor. Inspect the sensor rotor serrations for scratches, cracks, warping or missing teeth. Replace if necessary.
  14.  

To prevent from damaging the serrations, do NOT strike the axle hub with the rotor.

  1. Reconnect the speed sensor to the harness.
  2.  

Rear Sensor


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Fig. Rear speed sensor location

  1. Unplug the speed sensor connector.
  2.  
  3. Measure the resistance between the terminal 1 and 2 . The resistance should be as follows:

    4Runner, Tacoma and Tundra: 1.01.4 kohms
     
    T100: 0.62.05 kohms
     
    Land Cruiser: 0.51.6 kohms
     

  4.  
  5. If the resistance is not as specified, replace the sensor.
  6.  
  7. Check that there is no continuity between each terminal and the sensor body. If there is continuity, replace the sensor.
  8.  
  9. Attach the speed sensor harness.
  10.  
  11. Check the installation of the sensor. If the mounting bolt is loose, tighten it to 69 inch lbs. (8 Nm).
  12.  
  13. Remove the axle hub with the rotor. Inspect the sensor rotor serrations for scratches, cracks, warping or missing teeth.
  14.  

To prevent from damaging the serrations, do NOT strike the axle hub with the rotor.

REMOVAL & INSTALLATION



Front


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Fig. Pull the dust boot away from the wheel speed sensor



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Fig. Detach the speed sensor wiring harness



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Fig. Use a ratchet to loosen and remove the speed sensor retaining bolt . . .



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Fig. . . . then remove the sensor from the hub



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Fig. Once the sensor is removed, you can see the reluctor wheel



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Fig. Inspect the condition of the sealing O-ring, and replace if necessary

  1. Unplug the speed sensor harness from the unit.
  2.  
  3. On 4WD vehicles, remove the clamp bolts and clips holding the sensor harness from the frame, upper arm and steering knuckle.
  4.  
  5. On 2WD vehicles, remove the clamp bolts and clips holding the sensor harness to the frame and upper arm.
  6.  

Discard the old clips.

  1. Remove the sensor from the knuckle.
  2.  

To install:

  1. Attach the sensor to the steering knuckle, tighten to 6971 inch lbs. (78 Nm).
  2.  
  3. Attach the harness along the upper arm and frame with new clips. Tighten the mounting bolts to 4871 inch lbs. (58 Nm).
  4.  
  5. Engage the sensor harness to the unit.
  6.  

Rear
  1. Unplug the speed sensor harness from the unit.
  2.  
  3. Remove the clamp bolts and nuts holding the sensor harness from the frame, upper arm, axle housing and fuel tank (if attached).
  4.  

Discard the old clips.

  1. Remove the sensor from the axle.
  2.  

To install:

  1. Attach the sensor to the axle, tighten to 6971 inch lbs. (78 Nm).
  2.  
  3. Attach the harness along the appropriate areas, then tighten the mounting bolts to 4871 inch lbs. (58 Nm). Be sure to used all new clips, and install them in the same angle of the removed ones.
  4.  
  5. Engage the sensor harness to the unit.
  6.  

 
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