Abs & Traction Control System -Diagnostics: Pre-Check

DIAGNOSIS SYSTEM
1. Check the indicator.
  When the ignition switch is turned ON, check that the ABS warning light, TRAC OFF indicator light and SLIP indicator light comes on for 3 seconds.
  
  Fig 1: Identifying ABS, TRAC OFF & Slip Indicator Lights
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NOTE: If the indicator check result is not normal, proceed to the troubleshooting for the ABS warning light circuit, TRAC OFF indicator light circuit and SLIP indicator light circuit. See ABS WARNING LIGHT CIRCUIT , TRAC OFF INDICATOR, TRAC CUT SWITCH CIRCUIT or SLIP INDICATOR LIGHT CIRCUIT .
2. In case of not using hand-held tester:
  Check the DTC
  1. Disconnect the short pin from the DLC1.
    
    Fig 2: Disconnecting Short Pin From DLC1
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Using SST, connect terminals Tc and E₁ of the DLC2 or DLC1.
    SST 09843-18020
    
    Fig 3: Identifying Terminals Of DLC2 And DLC1
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Turn the ignition switch ON.
  4. Read the DTC from the ABS warning light and TRAC OFF indicator light on the combination meter.
    NOTE:
    If no code appears, inspect the diagnostic circuit or ABS warning light circuit, TRAC OFF indicator light circuit (See ABS WARNING LIGHT CIRCUIT , TC TERMINAL CIRCUIT or TRAC OFF INDICATOR, TRAC CUT SWITCH CIRCUIT ).
    
    As an example, the blinking patterns of the normal code and codes 11 and 21 are shown in Fig 4.
    
    Fig 4: Blinking Patterns Of Normal Code And Codes 11 And 21
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Codes are explained in the DIAGNOSTIC TROUBLE CODE CHART .
  6. 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.
3. In case of using hand-held tester:
  
  Fig 5: Connecting Hand Held Tester To DLC2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Check the DTC.
  1. Connect the hand-held tester to the DLC2.
  2. Turn the ignition switch ON.
  3. Read the DTC by following the prompts on the tester screen.
    Please refer to the hand-held tester operator's manual for further details.
4. Clear the DTC.
  1. Using SST, connect terminals Tc and E₁ of DLC2 or DLC1, and remove the short pin from the 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 5 seconds.
    
    Fig 6: Depressing Brake Pedal
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Check that the warning light shows the normal code.
  5. Remove the SST from the terminals of the DLC2 or DLC1.
    SST 09843-18020
  6. Connect the short pin to the DLC1.
    
    Fig 7: Connecting Short Pin To DLC1
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. SPEED SENSOR SIGNAL
  1. In case of not using hand-held tester:
    
    Fig 8: Identifying Terminals Of DLC1
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Check the speed sensor signal.
    1. Turn the ignition switch OFF.
    2. Using SST, connect terminals Ts and E₁ of the DLC1.
      SST 09843-18020
    3. Start the engine.
    4. Check that the ABS warning light blinks.
      NOTE: If the ABS warning light does not blink, inspect the ABS warning light circuit. See ABS WARNING LIGHT CIRCUIT .
      
      Fig 9: Blinking Pattern Of ABS Warning Light
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Drive the vehicle straight forward.
      NOTE: Drive the vehicle faster than 45 km/h (28 MPH) for several seconds.
    6. Stop the vehicle.
    7. Using SST, connect terminals Tc and E₁ of the DLC1.
      SST 09843-18020
    8. Read the number of blinks of the ABS warning light.
      NOTE:
      
      See the list of DTC list shown in Fig 10.
      
      If 2 or more malfunctions are indicated simultaneously, the lowest numbered code will be displayed first.
      
      If every sensor is normal, the normal code is output (A cycle of 0.25 seconds ON and 0.25 seconds OFF is repeated).
      Fig 10: Malfunction Code (Example Code 72 & 76)
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. After doing the check, disconnect the SST from terminals Ts and E₁ Tc and E₁ of the DLC1, and turn the ignition switch OFF.
      SST 09843-18020
  2. In case of using hand-held tester:
    Check the speed sensor signal.
    1. Connect the hand-held tester to the DLC2.
      
      Fig 11: Connecting Hand Held Tester To DLC2
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Do steps 3- 6.
    3. Read the DTC by following the prompts on the tester screen.
      Please refer to the hand-held tester operator's manual for further details.
    Fig 12: DTC Of Speed Sensor Check Function
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002