Abs With EBD & BA & TRAC & VSC System - Diagnosis: Pre-Check

DIAGNOSIS SYSTEM
1. Check the warning lights and buzzer.
  1. Release parking brake pedal.
  2. When the ignition switch is turned ON, check that the ABS warning light, BRAKE warning light, VSC warning light, VSC OFF indicator light and SLIP indicator light goes on for approx. 3 seconds.
  3. When depressing the brake pedal repeatedly it may turn on the BRAKE warning light and buzzer.
  Fig 1: Identifying Brake Warning Lights & Buzzers
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light is lit.
  - If the ECU stores DTC, ABS warning light, VSC warning light and VSC OFF indicator light is ON.
  - If the indicator check result is not normal, proceed to troubleshooting for the light circuit.
  TROUBLE AREA DETECTION
2. In case of not using LEXUS hand held tester:
  Check the DTC.
  1. Using SST, connect terminals Tc and CG of DLC3.
    SST 09843-18040
  2. Turn the ignition switch ON.
  3. Read the DTC from the ABS warning light or VSC warning light on the combination meter.
    
    Fig 2: Locating Tc & CG Terminals Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE:
    If no code appears, inspect the diagnostic circuit, ABS warning light circuit or VSC warning light circuit.
    TROUBLE AREA DETECTION
    
    TC TERMINAL CIRCUIT
    
    ABS WARNING LIGHT CIRCUIT
    
    VSC WARNING LIGHT CIRCUIT
    
    As an example, the blinking patterns for the normal code and codes 11 and 21 are shown on the left.
  4. Codes are explained in the code table on DIAGNOSTIC TROUBLE CODE CHART .
  5. After completing the check, disconnect terminal Tc and CG of DLC3, and turn off the display.
  If 2 or more malfunctions are detected at the same time, the lowest numbered DTC will be displayed 1st.
3. In case of using the LEXUS hand held tester:
  Check the DTC.
  1. Hook up the LEXUS hand held tester to the DLC3.
  2. Turn the ignition switch ON.
  3. Read the DTC by following the prompts on the tester screen.
  NOTE: Please refer to the LEXUS hand held tester operator's manual for further details.
  
  Fig 3: Identifying Normal Code Blinking Patterns
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. In case of not using LEXUS hand held tester:
  Clear the DTC.
  1. Using SST, connect the terminals Tc and CG of the DLC3.
    SST 09843-18040
  2. Turn the ignition switch ON.
  3. Clear DTC stored in ECU by depressing the brake pedal 8 or more times within 5 sec.
  4. Check that the ABS warning light and VSC warning light shows the normal code.
  5. Remove the SST from the DLC3.
    SST 09843-18040
  Fig 4: Depressing Brake Pedal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NOTE: Disconnect the battery cable during repairs will not erase the DTC in the ECU.
5. In case of using LEXUS hand held tester:
  Clear the DTC.
  1. Turn the ignition switch ON.
  2. Operate the LEXUS hand held tester to erase the codes.
  NOTE: Please refer to the LEXUS hand held tester operator's manual for further details.

FREEZE FRAME DATA

The vehicle (sensor) status memorized during ABS and/or VSC operation or at the time of error code detection can be displayed using the LEXUS hand held tester.
Only one record of freeze frame data is stored and the freeze frame data generated during ABS and/or VSC operation are constantly updated. Also, the number of the ignition switch's "ON" after the freeze frame data is stored can be memorized up to 31 and it can be displayed.
NOTE: If the ignition switch "ON" operation exceeds 31 times, "31" appears on the display.
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.

FREEZE FRAME DATA

Hand held tester display

Measurement Item

Reference Value⁽¹⁾

VEHICLE SPD

Vehicle speed

Speed indication of a meter

STOP LIGHT SW

Stop light switch signal

Stop light switch ON: ON, OFF: OFF

# IG ON

Numbers of operations of ignition switch ON after memorizing freeze frame data

0 - 31

MAS CYL PRESS

Master cylinder pressure sensor output voltage

Release brake pedal: 0.3 - 0.9 V
Depress brake pedal: 3.2 - 4.5 V

MASS PRESS GRADE

Master cylinder pressure sensor changing declivity

-30 - 200MPa/s

SYSTEM

Operate system

ABS operate: ABS
BA operate: BA
VSC (TRAC) operate: VSC (TRC)

YAW RATE

Yaw rate angle sensor output value

-70 - 70

STEERING ANG

Steering sensor output value

Left turn: Increase
Right turn: Drop

THROTTLE

Throttle position sensor output value

Release accelerator pedal: Approx. 0 deg
Depress accelerator pedal: Approx. 90 deg

G (RIGHT & LEFT)

Right and left G

-1.5 - 1.5

G (BACK & FORTH)

Back and forth G

-1.5 - 1.5

VSC (TRC) OFF SW

VSC OFF switch signal

VSC OFF SW ON: ON
OFF: OFF

SHIFT POSITION

Shift lever position

P: P
R: R
N: N
D: D
2: 2
L: L

⁽¹⁾	If no conditions are specifically stated for "Idling", it means the shift lever is at N or P position, the A/C switch is OFF and all accessory switches are OFF.

In case of not using LEXUS hand held tester: ABS SENSOR SIGNAL CHECK (TEST MODE)
NOTE: When having replaced the yaw rate sensor, deceleration sensor and/or ECU, perform zero point calibration of the yaw rate sensor and deceleration sensors (See step 7.).

NOTE: If the ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.
1. Procedures for test mode:
  1. Turn the ignition switch OFF.
  2. Using SST, connect terminals Ts and CG of DLC3
    SST 09843-18040
  3. Check that the steering wheel is in the straight-ahead position and shift the shift lever to P range.
  4. Turn the ignition switch ON.
  5. Check that the ABS warning light blinks.
  NOTE: If the ABS warning light does not blinks, inspect the ABS warning light circuit or Ts terminal circuit.
  
  Fig 5: Connecting Tc & CG Terminals Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  TROUBLE AREA DETECTION
  - TS TERMINAL CIRCUIT
  - ABS WARNING LIGHT CIRCUIT
2. Check the master cylinder pressure sensor.
  1. Leaving the vehicle in a stationary condition and the brake pedal in free condition for 1 sec. or more, continue to quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 sec. or more.
  NOTE: At this time, the ABS warning light goes on for 3 sec.
3. Check the speed sensor signal.
  1. Drive the vehicle straight forward with the speed faster than 45 km/h (28 mph) for several second and check that the ABS warning light comes off.
  NOTE: The sensor check may not be completed if the wheels spin or the steering wheels steered during this check.
4. Stop the vehicle.
5. Using SST, connect terminals Tc and CG of DLC3.
  SST 09843-18040
6. Read the number of blinks of the ABS warning light.
  NOTE:
  - See the list of DTC on DIAGNOSTIC TROUBLE CODE CHART .
  - If every sensor is normal, the normal code is output (A cycle of 0.25 sec. ON and 0.25 sec. OFF is repeated).
  - If 2 of more malfunctions are detected at the same time, the lowest numbered will be displayed 1st.
  Fig 6: Connecting Tc & CG Terminals Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 7: Malfunction Code Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. After doing the check, disconnect the SST from terminals Ts and CG, Tc and CG of DLC3 and turn the ignition switch OFF.
  SST 09843-19040
In Case Of Using LEXUS Hand Held Tester:
ABS SENSOR SIGNAL CHECK (TEST MODE)

NOTE: When having replaced the yaw rate sensor, deceleration sensor and/or ECU, perform zero point calibration of the yaw rate sensor and deceleration sensors (See step 7.). Make sure that this operation should be done before starting the following.

NOTE: If the ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.
1. Hook up the LEXUS hand held tester to the DLC3.
2. Do step 3 - (a) - (3) and from (b) to (d).
3. Read the DTC by following the prompts on the tester screen.
NOTE: Please refer to the LEXUS hand held tester operator's manual for further details.

In Case Of Not Using LEXUS Hand Held Tester:

VSC SENSOR SIGNAL CHECK (TEST MODE)

NOTE: When having replaced the yaw rate sensor, deceleration sensor and/or ECU, perform zero point calibration of the yaw rate sensor and deceleration sensors (See step 7.).

NOTE: If the ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.

Procedures for test mode:
1. Turn the ignition switch OFF.
2. Check that the shift lever position is at P range. Turn the steering wheel to the straight-ahead position.
3. Using SST, connect terminals Ts and CG of DLC3.
  SST 09843-18040
4. Start the engine and the VSC warning light blinks.
  NOTE: If the VSC warning light does not blinks, inspect the VSC warning light circuit or Ts terminal circuit.
  
  TROUBLE AREA DETECTION
  - TS TERMINAL CIRCUIT
  - VSC WARNING LIGHT CIRCUIT
5. Keep the vehicle in a stationary on a level place for 1 sec. or more.
Fig 8: Connecting Ts & CG Terminals Of DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the yaw rate sensor.

Shift the shift lever to the D range and drive the vehicle at the vehicle speed of approx. 5 km/h (3 mph Turn the steering wheel either to left or right for 90° or more, and maintain 180° circular drive for the vehicle.
Stop the vehicle and shift the shift lever to the P range. Check that the skid control buzzer sounds for 3 sec.

If the skid control buzzer sounds, the sensor check is in normal completion.

If the skid control buzzer dose not sound, check the skid control buzzer circuit, then do the sensor check again.

Fig 9: Identifying Vehicle Driving Curve & Directions

TROUBLE AREA DETECTION

Trouble Area

SKID CONTROL BUZZER CIRCUIT

If the skid control buzzer still does not sound, there is malfunction in the VSC sensor, so check the DTC.

NOTE:

Drive the vehicle circularly by 180°. At the end of the turn, the direction of the vehicle should be within 180° +/- 5° from its start position.
Do not spin the wheels.

Read the DTC.
1. Using SST, connect terminals Tc and CG of DLC3.
  SST 09843-18040
2. Read the number of VSC warning light on the combination meter.
  
  Fig 10: Connecting Tc & CG Terminals Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - See the list of DTC on DIAGNOSTIC TROUBLE CODE CHART .
  - If every sensor is normal, the normal code is output (A cycle of 0.25 sec. ON and 0.25 sec. OFF is repeated).
  - If 2 of more malfunctions are detected at the same time, the lowest numbered will be displayed 1st.
3. After doing the check, disconnect the SST from terminals Ts and CG, TC and CG of DLC3 and turn the ignition switch OFF.
  SST 09843-18040

In case of using LEXUS hand held tester:
VSC SENSOR SIGNAL CHECK (TEST MODE)

NOTE: When having replaced the yaw rate sensor, deceleration sensor and/or ECU5 perform zero point calibration of the yaw rate sensor and deceleration sensors (See step 7.). Make sure that this operation. should be done before starting the following.

NOTE: If the ignition switch is turned from ON to ACC or LOCK during test mode. DTC will be erased.
1. Hook up the LEXUS hand held tester to the DLC3.
2. Do steps 5- a, b and c.
3. Read the DTC by following the prompts on the tester screen.
NOTE: Please refer to the LEXUS hand held tester operator's manual for further details.
IF NECESSARY, PERFORM ZERO POINT CALIBRATION OF YAW RATE AND DECELERATION SENSORS
NOTE:
- When having replaced the yaw rate sensor, deceleration sensor or the ECU, make sure to perform yaw rate and deceleration sensor's zero point calibration. Be sure to complete this step 7. Once it is started.
- During step 7., a not-replaced sensor also requires zero point calibration.
NOTE:
- While obtaining the zero point, do not give any vibration to the vehicle by tilting, moving or shaking it and keep it in a stationary condition. (Do not start the engine.)
- Be sure to do this on a level surface (within an Inclination of 1 %).
1. Clear the zero points of the yaw rate and deceleration sensors.
  1. Shift the shift lever to P range.
  2. Turn the ignition switch ON in stationary condition.
  3. Using SST, repeat a cycle of short and open between terminals Ts and CG of DLC3 4 times or more within 8 sec. Check that the VSC indicator light is lit indicating the recorded zero point is erased.
    SST 09843-18040
  4. Turn the ignition switch OFF.
2. Obtain zero point of the yaw rate sensor.
  1. Make the terminals Ts and CG of DLC3 disconnected.
  2. Turn the ignition switch ON.
    
    Fig 11: Identifying Ts & CG Terminals Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NOTE: The vehicle should be in a stationary condition with the shift lever in P range.
  3. Check that the VSC warning light goes off about 15 sec. after the ignition switch is turned ON.
    NOTE: Even if the ignition is not turned OFF in step (a) - 4 and remains ON, the yaw rate sensor zero point calibration can be completed. In this case, the VSC warning light is lit for about 15 sec. and then starts blinking. (Normal code)
  4. After ensuring that the VSC warning light remains OFF for 2 sec, turn the ignition switch OFF.
  NOTE: If the ignition switch is not turned OFF in step (a) - 4, make sure that the VSC warning light blinks for 2 sec. Then turn the ignition switch OFF.
3. Perform deceleration sensor zero point calibration.
  NOTE: After step (b) (the yaw rate sensor zero point calibration), the VSC warning light goes off. At this time, if the vehicle is driven without performing step (c) (deceleration sensor zero point calibration), deceleration sensor zero point calibration malfunction will be defected and the VSC warning light will light up. Therefore, perform step (c) right after step (b).
  1. Using SST, connect the terminal Ts and CG of DLC3.
    SST 09843-18040
  2. Turn the ignition switch ON.
    NOTE: Place the vehicle in a stationary condition with the shift lever in P range.
  3. After turning the ignition switch ON, check that the VSC warning light is lit for about 4 sec. and then starts quick blinking at 0.13 sec. intervals.
  4. After ensuring the blinking of the VSC warning light for 2 sec, turn the ignition switch OFF.
  5. Remove the SST and make the terminals Ts and CG of DLC3 disconnected.
    SST 09843-18040
  Fig 12: Connecting Ts & CG Terminals Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 13: VSC Warning Light Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002