Abs With EBD - Diagnostics: Pre-Check

DIAGNOSIS SYSTEM
1. Release the parking brake lever.
2. Check the indicator.
  When the ignition switch is turned ON, check that the ABS warning light and BRAKE warning light illuminate for approximately 3 seconds.
  
  Fig 1: Identifying ABS Warning Light And Brake Light Indication
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  - When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light lights up.
  - If the indicator check result is not normal, proceed to the troubleshooting for the ABS warning light circuit or BRAKE warning light circuit (see ABS WARNING LIGHT CIRCUIT or BRAKE WARNING LIGHT CIRCUIT ).
  - Check the ABS1 fuse, ABS2 fuse and ABS actuator assembly.
3. When not using 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.
    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 of normal code and codes 11 and 21 are shown in Fig 3.
  4. Codes are detailed in Figure .
  5. After completing the check, disconnect terminals Tc and CG from the DLC3, and turn the display off.
    If 2 or more malfunctions are indicated at the same time, the lowest numbered DTC will be displayed first.
4. When using the hand-held tester:
  Check the DTC.
  1. Connect 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.
5. When not the using 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.
  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
6. When using the hand-held tester:
  Clear the DTC.
  1. Connect the hand-held tester to the DLC3.
  2. Turn the ignition switch ON.
  3. Operate the hand-held tester to erase the codes (see hand-held tester operator's manual).
FREEZE FRAME DATA
HINT:
- Whenever a DTC is detected or the ABS operates, the skid control ECU stores the current vehicle (sensor) state as freeze frame data.
- The skid control ECU stores the number of times (maximum: 31) the ignition switch has been turned OFF to ON since the last time ABS was activated. However, if the vehicle is not moved or driven at low speed (7 km/h (4.3 mph) or less), or if a DTC is detected, the skid control ECU will not count the number since then.
- Freeze frame data at the time the ABS operates:
  The skid control ECU stores and updates data whenever the ABS system operates.
  
  When the ECU stores data at the time a DTC is detected, the data stored when the ABS operated is erased.
- Freeze frame data at the time a DTC is detected:
  When the skid control ECU stores data at the time a DTC is detected, no updates will be performed until the data is cleared.
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. From the display on the tester, select the "FREEZE FRAME DATA".
  
  Fig 8: Hand-Held Tester Display Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
SPEED SENSOR SIGNAL
1. When not using 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.
    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 more than 45 km/h (28 mph) for several seconds.
  6. Stop the vehicle.
  7. Remove the SST from the terminals of the DLC3. SST 09843-18040
  8. Read the number of blinks of the ABS warning light.
    HINT:
    - See the DTC list shown in Fig 12.
    - If each sensor is normal, the normal code is output (a cycle of 0.25 seconds ON and 0.25 seconds OFF is repeated).
    - If 2 or more malfunctions are indicated at the same time, the lowest numbered code will be displayed first.
      
      Fig 10: Normal Code & Malfunction Code Chart
      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 the ignition switch OFF.
    SST 09843-18040
2. When using hand-held tester:
  Check the speed sensor signal.
  1. Connect the hand-held tester to the DLC3.
  2. Follow steps 3 to 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.
    
    DTC of speed sensor check function:
    
    Fig 12: DTC Trouble Detection Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

4WD: DECELERATION SENSOR CHECK

Connect 3 dry batteries of 1.5 V in series.
Connect terminal VGS to the batteries' positive (+) terminal, and terminal GGND to the batteries' negative (-) terminal. Apply about 4.5 V to terminals VGS and GGND.
NOTE: Do not apply voltage of 6 V or more to terminals VGS and GGND.

Check the output voltage of terminal GL1.

GL1 VOLTAGE SPECIFICATION

Condition	Standard Value
Horizontal	About 2.3 V
Lean forward	0.4 to about 2.3 V
Lean rearward	About 2.3 to 4.1 V

HINT:

If the sensor is tilted a lot, it may show the wrong value.
If dropped, the sensor should be replaced with a new one.
The sensor removed from the vehicle should not be placed upside down.

Fig 13: Inspecting Deceleration Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002