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

Components

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See Figure 1



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Fig. Fig. 1: Common cruise control component locations-T100 shown

TESTING



Cruise Control Main Switch
T100

See Figures 2 and 3

  1. Unplug the switch connector. It may be necessary to remove the steering column covers for access.
  2.  
  3. Check for continuity between terminals 3 and 5 with the switch both on and off.
  4.  
  5. Next, measure the resistance between terminals 3 and 4.
  6.  
  7. If the switch did not perform as indicated in the illustration, replace the control switch.
  8.  

LAND CRUISER

See Figures 3 and 4

  1. Inspect the continuity between the terminals 3 and 5.
  2.  
  3. Next, measure the resistance between terminals 3 and 4.
  4.  
  5. If the resistance is not to specifications, replace the control switch.
  6.  

Stop Light Switch

See Figures 5, 6, 7 and 8

The stop light switch is located behind the brake pedal. Inspect the continuity of the the various pin connections. Refer to the illustrations.



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Fig. Fig. 2: Main switch terminal locations-T100



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Fig. Fig. 3: Test the main switch as indicated in the illustration



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Fig. Fig. 4: Cruise control switch and the terminal connection pin locations



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Fig. Fig. 5: Stop light switch and the terminal connection pin locations-Land Cruiser



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Fig. Fig. 6: Stop light switch and the terminal connection pin locations-T100



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Fig. Fig. 7: On Land Cruiser, check for continuity between the terminals indicated



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Fig. Fig. 8: On T100, test the switch as indicated in the illustration

Vehicle Speed Sensor
LAND CRUISER

See Figure 9

The vehicle speed sensor is located in the back of the transmission.

  1. Remove the vehicle speed sensor from the vehicle.
  2.  
  3. Connect the positive lead from the battery to terminal 1 and the negative lead to terminal 2.
  4.  
  5. Connect the positive lead from the voltmeter to terminal 3 and the negative lead to terminal 2.
  6.  
  7. Revolve the shaft.
  8.  
  9. Check that there is a voltage change between terminals 3 and 2.
  10.  
  11. The voltage change should be 4 times per each revolution of the vehicle speed sensor shaft. If the operation is not as specified, replace the sensor.
  12.  

T100

See Figures 10 and 11

Testing is performed from the back of the combination meter assembly.

  1. Unplug connector C from the combination meter, then inspect the connector on the wire harness side.
  2.  
  3. Is there continuity between terminal C10 and ground- If not, there is an open circuit in the wire harness between terminal C10 of the combination meter and ground or there is a ground fault.
  4.  
  5. Engage connector A of the combination meter. Unplug the connector from the cruise control ECM, then inspect the connector on the wire harness side.
  6.  
  7. If there is continuity repeatedly between terminal 20 and ground, replace the cruise control ECM, then recheck the system.
  8.  
  9. If there is no continuity, there is an open or short circuit in the wire harness between terminals 20 of the cruise ECM and C10 of the combination meter. Or, there is an open or short in the circuit plate of the combination meter between terminal C10 and the speed sensor.
  10.  

Actuator
LAND CRUISER

See Figures 12, 13, 14 and 15

  1. To check the actuator magnetic clutch:
    1. Check that the arm moves smoothly by hand.
    2.  
    3. Attach the positive lead from the battery to terminal 5 and negative lead to terminal 4. Have the magnetic clutch turned on.
    4.  
    5. Check that the arm does not move by hand at this point.
    6.  

  2.  


WARNING
Do not connect the wires to the wrong battery terminals. You will damage your cruise control actuator.



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Fig. Fig. 9: Connect the voltmeter and battery as shown to test the speed sensor



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Fig. Fig. 10: Terminal locations on the T100 without a tachometer



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Fig. Fig. 11: Terminal locations on the T100 with a tachometer



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Fig. Fig. 12: Check to see that the actuator arm moves freely



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Fig. Fig. 13: Actuator terminal identification



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Fig. Fig. 14: With power applied as shown, the arm should be locked



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Fig. Fig. 15: When the arm is moving from the closed to the open position, check the resistance between terminals 2 and 3

  1. If the operation is not as specified in the test, replace the actuator motor.
  2.  
  3. To check the operation of the motor:
    1. With the magnetic clutch on, connect the positive lead from the battery to terminal 6, then attach the negative lead to terminal 7. Check that the arm moves to the open side.
    2.  
    3. When the arm reached to the open position, check that the motor operation stops.
    4.  
    5. While the magnetic clutch is on, attach the positive lead from the battery terminal 7 and the negative lead to terminal 6. Check that the arm moves to the close side.
    6.  
    7. While the arm reaches the closed position, check to see if the motor operation stops.
    8.  

  4.  
  5. To inspect the position sensor:
    1. Measure the resistance between terminals 1 and 3 of the connection. Resistance should read approximately 2k ohms.
    2.  
    3. When the arm is moving from the closed to the open position, check to see the resistance between terminals 2 and 3 increases from approximately 500-700 ohms.
    4.  

  6.  

T100

See Figure 16

  1. To check the actuator magnetic clutch:
    1. Check that the arm moves smoothly by hand.
    2.  
    3. Attach the positive lead from the battery to terminal 5 and negative lead to terminal 4. Have the magnetic clutch turned on. Check that the arm does not move by hand.
    4.  

  2.  



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Fig. Fig. 16: Measure the resistance between terminals 1 and 3


CAUTION
Do not connect the high tension cables to the wrong battery terminals. You will damage your cruise control actuator.

  1. If the operation is not as specified in the test, replace the actuator motor.
  2.  
  3. To check the operation of the motor:
    1. With the magnetic clutch on, connect the positive lead from the battery to terminal 6, then attach the negative lead to terminal 7. Check that the arm moves to the open side.
    2.  
    3. When the arm reached to the open position, check that the motor operation stops.
    4.  
    5. While the magnetic clutch is on, attach the positive lead from the battery terminal 7 and the negative lead to terminal 6. Check that the arm moves to the close side.
    6.  
    7. While the arm reaches the closed position, check to see if the motor operation stops.
    8.  

  4.  
  5. To inspect the position sensor:
    1. Measure the resistance between terminals 1 and 3 of the connection. Resistance should read approximately 2k ohms.
    2.  
    3. When the arm is moving from the closed to the open position, check to see the resistance between terminals 2 and 3 increases from approximately 500-800 ohms.
    4.  

  6.  

Clutch Start Switch

See Figures 17 and 18

  1. Remove the switch from the vehicle.
  2.  
  3. Check the continuity of the switch as indicated in the illustration.
  4.  
  5. If the switch does not operate as indicated, replace the switch.
  6.  



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Fig. Fig. 17: Connect an ohmmeter between the two terminals to check for continuity



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Fig. Fig. 18: Check that the switch operates as indicated

 
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