Section 360 (Abs With BA & EBD System - Diagnostics): Pre-Check

WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

Diagnosis System
1. Check the warning light.
  
  Fig 1: Identifying ABS & BRAKE Warning Lights
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  When the ignition switch is turned ON, check that the ABS warning light and BRAKE warning light goes on for 3 seconds.
  NOTE:
  - When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light is lit.
  - If the indicator check result is not normal, proceed to troubleshooting for the ABS warning light circuit (See ABS WARNING LIGHT CIRCUIT (REMAINS ON) or ABS WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP) ) or brake warning light circuit (See BRAKE WARNING LIGHT CIRCUIT ).
2. In case of not using TOYOTA hand-held tester:
  Check the DTC.
  1. Using SST, connect terminals Tc and CG of DLC3.
    
    Fig 2: Using SST To Test Terminals Tc & CG
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. SST 09843-18040
  2. Turn the ignition switch ON.
  3. Read the DTC from the ABS warning light on the combination meter.
    NOTE:
    If no code appears, inspect the diagnostic circuit or ABS warning light circuit (See TC TERMINAL CIRCUIT or ABS WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP) ).
    
    As on 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, see DIAGNOSTIC TROUBLE CODE CHART .
    If 2 or more malfunctions are indicated at the same time the lowest numbered DTC will be displayed first.
  5. After completing the check, remove the SST from the DLC3.
    1. SST 09843-18040
3. In case of using TOYOTA hand-held tester:
  Check the DTC.
  1. Read the DTC by following the prompts on the tester screen.
  NOTE: Please refer to the TOYOTA hand-held tester operator's manual for further details.
4. In case of not using TOYOTA hand-held tester:
  Clear DTC.
  1. Using SST, connect the terminals Tc and CG of the DLC3.
    1. SST 09843-18040
  2. Turn the ignition switch ON.
    
    Fig 3: Reviewing Blinking Patterns Codes 11 & 21
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Clear DTC stored in ECU by depressing the brake pedal 8 or more times within 5 seconds.
    
    Fig 4: Depressing Brake Pedal To Clear DTC
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Check that the ABS warning light shows the normal code.
  5. Remove the SST from the DLC3.
  NOTE: Disconnect the battery cable during repairs will not erase the DTC in the ECU.
5. In case of using TOYOTA hand-held tester:
  Clear the DTC.
  1. Turn the ignition switch ON.
  2. Operate the TOYOTA hand-held tester to erase the codes.
  NOTE: Please refer to the TOYOTA hand-held tester operator's manual for further details.
Freeze Frame Data
1. The vehicle (sensor) status at the occurrence of abnormality of the diagnosis code and during the ABS operating can be memorized and displayed using the TOYOTA hand-held tester.
2. Only one record of freeze frame data is stored, however, freeze frame data during the ABS operating is always updated. After the storage of freeze frame data, up to 31 ignition "ON" operations are stored and displayed.
  NOTE: If the ignition switch "ON" operation exceeds 31 times, "31" appears on the display.
3. If the diagnosis code abnormality occurs, the freeze frame data at the occurrence of the abnormality is stored but the ABS actuation data is deleted.
  
  Fig 5: Reviewing TOYOTA Hand-Held Tester Information
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Speed Sensor Signal Check
NOTE: If the ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.
1. In case of not using TOYOTA hand-held tester:
  Check the speed sensor signal.
  1. Turn the ignition switch ON.
  2. Using SST, connect the terminals Ts and CG of DLC3.
    1. SST 09843-18040
    Fig 6: Using SST To Check Speed Sensor Signal
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Start the engine.
  4. Check that the ABS warning light blinks.
    
    Fig 7: Checking ABS Warning Light Operation
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NOTE: If the ABS warning light does not blink, inspect the ABS warning light circuit and Ts circuit (See ABS WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP) and TS TERMINAL CIRCUIT ).
  5. While the vehicle is stationary, release the brake pedal for one second. Then depress the brake pedal with a force of at least 98 N (10 kgf) for more than one second.
  6. While the vehicle is stationary, quickly depress the brake pedal. At this time, confirm that the ABS warning light remains lit for approximately 3 seconds.
  7. Drive the vehicle faster than 45 km/h (28 MPH) for several seconds.
  8. Stop the vehicle.
  9. Using SST, connect the terminals Tc and CG of the DLC3.
    1. SST 09843-18040
  10. Read the number of blinks of the ABS warning light.
    NOTE:
    See the list of DTC. See DIAGNOSTIC TROUBLE CODE CHART .
    
    If every 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.
    Fig 8: Reviewing Malfunction Code Information
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. After doing the check, turn the ignition switch OFF, and remove the SST from the DLC3.
2. In case of using TOYOTA hand-held tester:
  Check the sensor signal.
  1. Do steps 4- 9 under SPEED SENSOR SIGNAL CHECK.
  2. Read the DTC by following the prompts on the tester screen.
  NOTE: Please refer to the TOYOTA hand-held tester operator's manual for further details.
Brake Assist Operate Check
NOTE: If the ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.
1. In case of not using TOYOTA hand-held tester:
  Check the brake assist operate.
  1. Using SST, connect terminals Ts and CG of DLC3.
    
    Fig 9: Using SST To Check Brake Assist Operation
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. SST 09843-18040
  2. Start the engine.
  3. Check that the ABS warning light blinks.
    
    Fig 10: Checking ABS Warning Light Operation
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NOTE: If the ABS warning light does not blink, inspect the ABS warning light circuit and Ts circuit (See ABS WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP) and TS TERMINAL CIRCUIT ).
  4. While the vehicle is stationary, release the brake pedal for one second. Then depress the brake pedal with a force of at least 98 N (10 kgf) for more than one second.
  5. While the vehicle is stationary, quickly depress the brake pedal. At this time, confirm that the ABS warning light remains lit for approximately 3 seconds.
2. In case of using TOYOTA hand-held tester:
  Check the brake assist operate.
  
  Do step 2- 5 of step (a) above.
NOTE: Please refer to the TOYOTA hand-held tester operator's manual for further details.
Deceleration Sensor Check (4WD)
1. Connect 3 dry batteries of 1.5 V in series.
  
  Fig 11: Checking Deceleration Sensor Voltage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect VGS terminal to the batteries' positive (+) terminal, and GGND terminal to the batteries' negative (-) terminal, apply about 4.5 V between VGS - GGND terminals.
  NOTE: Do not apply voltage of 6 V or more to terminals VGS and GGND.
3. Check the output voltage of GL1 and GL2 terminals.
  
  Fig 12: Reviewing Deceleration Sensor Information
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - If the sensor is tilted too much 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.