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    1974 AMC Javelin 4.2L 1BL 6cyl

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    Toyota Previa 1991-1997 Repair Information

    Diagnosis And Testing

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    The ECM contains a built-in, self-diagnosis system which detects troubles within the engine signal network. Once a malfunction is detected, the Malfunction Indicator Lamp (MIL), located on the instrument panel, will light.

    By analyzing various signals, the ECM detects system malfunctions related to the operating sensors. The ECM stores the failure code associated with the detected failure until the diagnosis system is cleared.

    The MIL on the instrument panel informs the driver that a malfunction has been detected. The light will go out automatically once the malfunction has been cleared.

    DATA LINK CONNECTORS (DLC)



    The DLC1 is located under the drivers seat. The DLC3 is located in the fuse box at the center of the upper driver's side dash.

    Reading Codes

    2TZ-FE Engine

    See Figures 1, 2, 3 and 4

    1. Make sure the battery voltage is about 12 volts.
    2.  
    3. Turn the ignition switch to the ON position.
    4.  
    5. Check that the ABS warning light illuminates for about 3 seconds. If not, inspect and repair or replace the fuse, bulb or wiring harness.
    6.  



    Click image to see an enlarged view

    Fig. Fig. 1: The ABS warning light is located in the instrument panel

    1. Turn the ignition switch to the ON position.
    2.  
    3. Disconnect the service connector.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 2: Disengage the service connector prior to reading the ABS codes-2TZ-FE engine

    1. Using a jumper wire connect terminals Tc to E1 of the check connector.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 3: ABS Tc and E1 terminal locations of the check connector-2TZ-FE engine

    1. In the event that there is a malfunction, 4 seconds later the warning light will begin to blink. Read the number of blinks.
    2.  

    The first number of blinks will equal the first digit of as two digit code. After a 1.5 second pause, the 2nd number of blinks will equal the 2nd number of the two digit code. If there are more than two or more codes, there will be a 2.5 second pause between codes. The indication will begin after a 4.0 second pause from the smaller value and continue in order to larger.



    Click image to see an enlarged view

    Fig. Fig. 4: ABS trouble code example-2TZ-FE engine

    1. If the system is operating normally with no malfunctions, the warning light will blink once every 0.5 seconds.
    2.  
    3. Reair the system.
    4.  
    5. After the malfunction occurs, and components have been repaired, clear the coeds stored in the ECM.
    6.  
    7. Remove the jumper wire from the TC and E1 terminals of the check connector.
    8.  
    9. Attach the service connector.
    10.  
    11. Turn the ignition switch to the ON position and check that the ABS light goes off after the warning light goes on for about 3 seconds.
    12.  

    2TZ-FZE Engine

    See Figure 5, 6 and 7

    1. Make sure the battery voltage is about 12 volts.
    2.  
    3. Turn the ignition switch to the ON position.
    4.  
    5. Check that the ABS warning light illuminates for about 3 seconds. If not, inspect and repair or replace the fuse, bulb or wiring harness.
    6.  
    7. Turn the ignition switch to the ON position.
    8.  
    9. Using a jumper wire connect terminals TC to E1 of the DLC1.
    10.  
    11. Pull out the short pin.
    12.  



    Click image to see an enlarged view

    Fig. Fig. 5: The short pin is located in the DLC1-2TZ-FZE engine

    1. In the event that there is a malfunction, 4 seconds later the warning light will begin to blink. Read the number of blinks.
    2.  

    The first number of blinks will equal the first digit of as two digit code. After a 1.5 second pause, the 2nd number of blinks will equal the 2nd number of the two digit code. If there are more than two or more codes, there will be a 2.5 second pause between codes. The indication will begin after a 4.0 second pause from the smaller value and continue in order to larger.

    1. If the system is operating normally with no malfunctions, the warning light will blink once every 0.5 seconds.
    2.  
    3. Reair the system.
    4.  
    5. After the malfunction occurs, and components have been repaired, clear the coeds stored in the ECM.
    6.  
    7. Remove the jumper wire from the TC and E1 terminals of the DLC1.
    8.  
    9. Install the short pin in the DLC1.
    10.  
    11. Turn the ignition switch to the ON position and check that the ABS light goes off after the warning light goes on for about 3 seconds.
    12.  

    Clearing Trouble Codes

    1. Turn the ignition switch to the ON position.
    2.  
    3. Disconnect the service connector, or pull the short pin, depending on the type your model has.
    4.  
    5. Using a jumper wire, connect terminals Tc and E1 of the DLC1
    6.  
    7. Depress the brake pedal 8 or more times within 3 seconds.
    8.  
    9. Chek that the warning light shows a normal code.
    10.  
    11. Attach the service connector or install the short pin.
    12.  
    13. Remove the jumper wire and double check the warning light is at normal code.
    14.  



    Click image to see an enlarged view

    Fig. Fig. 6: ABS diagnostic codes-2TZ-FE engine



    Click image to see an enlarged view

    Fig. Fig. 7: ABS diagnostic codes-2TZ-FZE engine

     
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