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 come on for 3 seconds.
  
  HINT:
  
  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 , SLIP Indicator Light Circuit ).
  
  Fig 1: Identifying ABS & Traction Control System Warning Light Indicators
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. In case of not using TOYOTA 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, or terminals Tc and CG of the DLC3.
    SST 09843-18020 or 09843-18040
  3. Turn the ignition switch ON.
  4. Read the DTC from the ABS warning light and TRAC OFF indicator light on the combination meter.
    
    Fig 3: Identifying Terminals TC And E1 Of DLC2 Or DLC1 And TC And CG Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    - If no code appears, inspect the diagnostic circuit or ABS warning light circuit, TRAC OFF indicator light circuit (See Tc Terminal Circuit , ABS Warning Light 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 the illustration.
  5. Codes are explained in the code table on DIAGNOSTIC TROUBLE CODE CHART .
  6. After completing the check, disconnect terminals Tc and E₁ of the DLC1 or DLC2, or terminals Tc and CG of the DLC3, and turn off the display.
  If 2 or more malfunctions are indicated simultaneously, the lowest numbered DTC will be displayed first.
  
  Fig 4: Identifying Blinking Patterns Of Normal Code And Codes 11 And 21
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. In case of using TOYOTA hand-held tester:
  Check the DTC.
  1. Connect the TOYOTA hand-held tester to the DLC3.
  2. 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 5: Connecting TOYOTA Hand-Held Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Clear the DTC.
  1. Using SST, connect terminals Tc and E₁ of the DLC2 or DLC1, or terminals Tc and CG of the DLC3 and remove the short pin from the DLC1.
    SST 09843-18020 or 09843-18040
  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.
  4. Check that the warning light shows the normal code.
    
    Fig 6: Clearing DTC Stored In ECU
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Remove the SST from the terminals of the DLC2, DLC1 or DLC3.
    SST 09843-18020 or 09843-18040
  6. Connect the short pin to the DLC1.
  Fig 7: Connecting Short Pin To DLC1
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
SPEED SENSOR SIGNAL
1. In case of not using TOYOTA hand-held tester:
  Check the speed sensor signal.
  1. Turn the ignition switch OFF.
  2. Using SST, connect terminals Ts and E₁ of the DLC1, or terminals Ts and CG of the DLC3.
    SST 09843-18020 or 09843-18040
  3. Start the engine.
    
    Fig 8: Identifying Terminals TS And E1 Of DLC1 Or Terminals TS And CG Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. 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 ).
  5. Drive the vehicle straight forward.
    HINT:
    
    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, or terminals Tc and CG of the DLC3.
    SST 09843-18020 or 09843-18040
  8. Read the number of blinks of the ABS warning light.
    
    Fig 9: Identifying ABS Warning Light Blinking Pattern
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    - See the list of DTC list shown on the next page.
    - 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 second ON and 0.25 second OFF is repeated).
    Fig 10: Identifying Blinking Patterns Of Malfunction Codes 72 And 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, or terminals Ts and CG, Tc and CG of the DLC3, and turn the ignition switch OFF.
  SST 09843-18020 or 09843-18040
2. In case of using TOYOTA hand-held tester:
  Check the speed sensor signal.
  1. Connect the TOYOTA hand-held tester to the DLC3.
  2. Do step (3) 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 11: Connecting TOYOTA Hand-Held Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DTC of speed sensor check function:

Fig 12: Speed Sensor Diagnostic Trouble Code Chart (1271 - 1278)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002