Anti-Lock Brake System (BOSCH Made) -Diagnostics: Pre-Check

DIAGNOSIS SYSTEM
1. Check the indicator.
  When the ignition switch is turned ON, check that the ABS warning light come on for 2 seconds.
  
  HINT:
  
  If the indicator check result is not normal, proceed to the troubleshooting for the ABS warning light circuit (See ABS Warning Light Circuit ).
  
  Fig 1: Identifying ABS Warning Light Indicator
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the DTC.
  1. Using SST, connect terminals Tc and E₁ of the DLC2 or DLC1.
    SST 09843 - 18020
    
    Fig 2: Identifying Terminals TC And E1 Of DLC2 Or DLC1
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Turn the ignition switch ON.
  3. Read the DTC from the ABS warning light on the combination meter.
    HINT:
    - If no code appears, inspect the diagnostic circuit or ABS warning light circuit (See Tc Terminal Circuit or ABS Warning Light Circuit ).
    - As an example, the blinking patterns for the normal code and codes 11 and 21 are shown in the illustration.
  4. Codes are explained in the code table on DIAGNOSTIC TROUBLE CODE CHART .
  5. After completing the check, disconnect terminals Tc and E₁ of the DLC1 or DLC2, and turn off the display.
  If 2 or more malfunctions are indicated simultaneously the lowest numbered DTC will be displayed first.
  
  Fig 3: Identifying Blinking Patterns Of Normal Code And Codes 11 And 21
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Using TOYOTA hand-held tester, check the DTC.
  1. Connect the TOYOTA hand-held tester to the DLC2.
  2. Read the DTC by following the prompts on the tester screen.
  HINT:
  
  Please refer to the TOYOTA hand-held tester operator's manual for further details.
  
  Fig 4: Connecting TOYOTA Hand-Held Tester To DLC2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Clear the DTC.
  1. Using SST, connect terminals Tc and E₁ of the DLC2 or DLC1.
    SST 09843 - 18020
  2. Turn the ignition switch ON.
  3. Clear the DTC stored in the ECU by depressing the brake pedal 8 or more times within 3 seconds.
  4. Check that the warning light shows the normal code.
  5. Remove the SST from the terminals of the DLC2 or DLC1.
  Fig 5: Clearing DTC Stored In ECU
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
SST 09843 - 18020

HINT:

Cancellation cannot be done by removing the battery cable or ECU-B fuse.
SPEED SENSOR SIGNAL
1. In case of not using TOYOTA hand-held tester:
  Check the speed sensor signal.
  1. When the ignition switch is turned ON, check that the ABS warning light comes on for 2 seconds.
  2. Turn the ignition switch OFF.
  3. Using SST, connect terminals Ts and E₁ of the DLC1.
    SST 09843 - 18020
    
    Fig 6: Identifying Terminals TS And E1 Of DLC1
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Start the engine.
  5. Check that the ABS warning light blinks.
    HINT:
    
    If the ABS warning light does not blink, inspect the ABS warning light circuit (See ABS Warning Light Circuit ).
  6. Drive the vehicle straight forward.
    HINT:
    
    Drive the vehicle at 45 - 55 km/h (28 - 34 mph) for several seconds. If the brake is applied during the check, the check routine must be followed again.
    
    Fig 7: Identifying ABS Warning Light Blinking Pattern
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Stop the vehicle.
  8. Turn the ignition switch OFF.
  9. Disconnect the SST from terminals Ts and E₁ , and connect the SST to terminals Tc and E₁ of the DLC1.
    SST 09843 - 18020
  10. Turn the ignition switch ON.
  11. Read the number of blinks of the ABS warning light.
    HINT:
    - See the DTC list . See Fig 10.
    - If every sensor is normal, the normal code is output (A cycle of 0.25 second ON and 0.25 second OFF is repeated).
    - If 2 or more malfunctions are indicated simultaneously, the lowest numbered code will be displayed first.
    Fig 8: Identifying Blinking Patterns Of Malfunction Codes 72 And 76
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. After doing the check, disconnect the SST from terminals Tc and E₁ of the DLC1, and turn the ignition switch OFF.
    SST 09843 - 18020
2. Using TOYOTA hand-held tester:
  Check the speed sensor signal
  1. Connect the TOYOTA hand-held tester to the DLC2.
  2. Follow steps 4 to 6 on the previous page.
  3. Read the DTC by following the prompts on the tester screen.
    Please refer to the TOYOTA hand-held tester operator's manual for further details.
  Fig 9: Connecting TOYOTA Hand-Held Tester To DLC2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DTC of speed sensor check function:

Fig 10: Speed Sensor Diagnostic Trouble Code Chart (71 - 78)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002