Anti-Lock Brake System - 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
  2. Turn the ignition switch ON.
  3. Read the DTC from the ABS warning light on the combination meter.
    
    Fig 2: Connecting Hand Held Tester To Terminals Tc & CG Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    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 on the left.
  4. Codes are explained in the code table 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.
  
  Fig 3: Identifying Blinking Patterns For Normal Code & Codes 11 & 21
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. When the using hand-held tester:
  Check the DTC.
  1. Hook up the hand-held tester to the DLC3.
  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.
  Fig 4: Connecting Hand Held Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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
  2. Turn the ignition switch ON.
    
    Fig 5: Connecting Terminals Tc & CG Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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.
  5. Remove the SST from the terminals of the DLC3.
    SST 09843-18040
  Fig 6: Checking Warning Light Normal Code
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. When using the hand-held tester:
  Clear the DTC.
  1. Hook up the hand-held tester to the DLC3.
  2. Turn the ignition switch ON.
  3. Operate the hand-held tester to erase the codes. (See the hand-held tester operators manual.)
Fig 7: Connecting Hand Held Tester To DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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
  3. Start the engine.
  4. Check that the ABS warning light blinks.
    
    Fig 8: Testing Speed Sensor Signal
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    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.
    HINT:
    - See the list of DTC shown on the next page.
    - 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.
    Fig 9: Identifying ABS Warning Light Number Of Blinks
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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.
  2. Perform steps (3) to (6) on the previous page and this page.
  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 10: Connecting Hand Held Tester To DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC of speed sensor check function:

Fig 11: DTC Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002