Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Deceleration Sensor

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SYSTEM TEST



Refer to the speed sensor system test.

COMPONENT TESTING



The deceleration sensor is located in the center of the vehicle behind the lower dash cover. It transmits signals to the ECU regarding deceleration rate.

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. Check the battery voltage with the engine off; voltage should be approximately 12 volts.
  2.  
  3. With the ignition switch ON , make certain the REAR ANTI-LOCK warning lamp comes on for about 2 seconds and then goes out. Turn the ignition switch OFF .
  4.  
  5. Use a jumper wire to attach terminals Tc, Ts and E1 at the DLC1 connector.
  6.  
  7. Apply the parking brake fully, depress the brake pedal and start the engine.
  8.  
  9. After a short delay, the dashboard warning lamp should flash about once every second. This is slower than the usual system flashing when transmitting a code.
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  11. Release the parking brake and drive the vehicle straight ahead at 12.4 mph (20 km) or greater speed. Strongly depress the brake pedal; the warning lamp should begin flashing evenly and rapidly, about 8 times per second.
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  13. Stop the vehicle and turn the ignition switch OFF . Remove the jumper wire from the DLC1 connector.
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  15. If the warning lamp display does not meet specifications, check the installation of the deceleration sensor. It must be correctly and securely installed. If installation is OK, replace the sensor and retest the system.
  16.  

REMOVAL & INSTALLATION



See Figures 1, 2 and 3

  1. Remove the lower center cover from the instrument panel.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the deceleration sensor mounting-Pick-Up shown



Click image to see an enlarged view

Fig. Fig. 2: Remove the lower instrument panel cover

  1. Remove the 2 bolts holding the deceleration sensor bracket and lift the unit free.
  2.  



Click image to see an enlarged view

Fig. Fig. 3: Remove the 2 bolts that secure the bracket to the unit

  1. With the ignition OFF , unplug the wiring connector at the sensor. Remove the sensor and bracket assembly.
  2.  

To install:
  1. Attach the wire harness connector to the sensor. Install the sensor and bracket; tighten the retaining bolts to 48 inch lbs. (5.4 Nm).
  2.  

The sensor must be mounted approximately level in the vehicle. The mounting bolts must be equally snug to keep the unit from rocking or being on an angle.

  1. Install the lower center cover on the instrument panel.
  2.  

 
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