Brakes - Abs (Diagnostics): Pre-Check

DIAGNOSIS SYSTEM
1. Check the ABS warning light.
  When the ignition switch is turned ON, check that the ABS warning light comes on for approx. 3 seconds.
  
  HINT:
  
  If the warning light is abnormal, proceed to troubleshooting for the ABS warning light circuit (See ABS WARNING LIGHT CIRCUIT ).
  
  Fig 1: Identifying ABS Warning Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. When not using the hand-held tester:
  Check the DTC.
  1. Using SST, connect terminals Tc and CG of the DLC3.
    SST 09843-18040
    
    Fig 2: Connecting Tc And CG Terminals Of DLC3
    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 ).
    - As an example, the blinking patterns for normal code and codes 11 and 21 are shown in Fig 3 .
    Fig 3: Example Of Codes 11 And 12 Blinking Patterns
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Codes are explained in the code table on DIAGNOSTIC TROUBLE CODE CHART .
  5. After completing the check, disconnect terminals Tc and CG of the DLC3, and turn off the display.
  If 2 or more malfunctions are indicated at the same time, the lowest numbered DTC will be displayed first.
3. When using the hand-held tester:
  Check the DTC.
  1. Hook up the hand-held tester to the DLC3.
    
    Fig 4: Connecting Hand-Held Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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. When not using the hand-held tester:
  Clear the DTC.
  1. Using SST, connect terminals Tc and CG of the DLC3.
    SST 09843-18040
    
    Fig 5: Connecting Tc And CG Terminals Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 To Clear Stored DTC
    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 DLC3.
    SST 09843-18040
5. When using the hand-held tester:
  Clear the DTC.
  1. Hook up the hand-held tester to the DLC3.
    
    Fig 7: Connecting Hand-Held Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Turn the ignition switch ON.
  3. Operate the hand-held tester to erase the codes. (See the hand-held tester operator's manual.)
SPEED SENSOR SIGNAL (TEST MODE)
1. When not using the hand-held tester:
  Check the speed sensor signal.
  1. Turn the ignition switch OFF.
  2. Using SST, connect terminals Ts and CG of the DLC3.
    SST 09843-18040
    
    Fig 8: Connecting Ts And CG Terminals Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Start the engine.
  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 at faster than 45 km/h (28 mph) for several seconds.
  6. Stop the vehicle.
  7. Using SST, connect terminals Tc and CG of the DLC3.
    SST 09843-18040
  8. Read the number of blinks of the ABS warning light.
    
    Fig 9: ABS Warning Light Blinking Pattern
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    - See list of DTC shown in Fig 11 .
    - If each sensor is normal, a normal code is output (A cycle of 0.25 sec. ON and 0.25 sec. OFF is repeated).
    - If 2 or more malfunctions are indicated at the same time, the lowest numbered code will be displayed first.
  9. After doing the check, disconnect the SST from terminals Ts, Tc and CG of the DLC3, and turn ignition switch OFF.
    SST 09843-18040
2. When Using the hand-held tester:
  Check the DTC.
  1. Hook up the hand-held tester to the DLC3.
    
    Fig 10: Connecting Hand-Held Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Perform steps (3) to (6) in step a .
  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.
  
  DTC of speed sensor check function:
  
  Fig 11: DTC Of Speed Sensor Check Function Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002