Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics): Pre-Check

DIAGNOSIS SYSTEM

Check the warning lights and buzzer.

Release the parking brake lever.
When the ignition switch is turned ON, check that the ABS, VSC TRAC and BRAKE warning lights, VSC OFF, SLIP and TRAC indicator lights come on for 3 sec.
When depressing the brake pedal repeatedly, it may turn on the ABS, VSC TRAC and BRAKE warning lights, VSC OFF indicator light and buzzer.

Fig 1: Identifying Warning Lights & Buzzer
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If the ECU stores DTC, the ABS, VSC TRAC and BRAKE warning lights and VSC OFF indicator light come ON.

If the indicator check result is not normal, proceed to troubleshooting in TROUBLE AREA AND REFERENCE .

TROUBLE AREA AND REFERENCE

Trouble Area	Reference
ABS warning light circuit	ABS WARNING LIGHT CIRCUIT
VSC TRAC warning light circuit	VSC TRAC WARNING LIGHT CIRCUIT
BRAKE warning light circuit	BRAKE WARNING LIGHT CIRCUIT
VSC OFF indicator light circuit	VSC OFF INDICATOR LIGHT, CENTER DIFF LOCK SWITCH CIRCUIT
SLIP indicator light circuit	SLIP INDICATOR LIGHT CIRCUIT
TRAC indicator light circuit	TRAC INDICATOR LIGHT CIRCUIT

Fig 2: Identifying DLC1 & DLC3 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

In case of not using hand-held tester:

Check the DTC.

Using SST, connect terminals Tc and E₁ of the DLC1 or Tc and CG of the DLC3.
SST 09843-18020 or 09843-18040
Turn the ignition switch ON.

Read the DTC from the ABS or VSC TRAC warning light on the combination meter.

HINT:

If no code appears, inspect the Tc circuit, ABS or VSC TRAC warning light circuit.

TROUBLE AREA AND REFERENCE

Trouble Area	Reference
Tc circuit	TC TERMINAL CIRCUIT
ABS warning light circuit	ABS WARNING LIGHT CIRCUIT
VSC TRAC warning light circuit	VSC TRAC WARNING LIGHT CIRCUIT

As an example, the blinking patterns for normal code and codes 11 and 21 are shown on the left.

Codes are explained in the DIAGNOSTIC TROUBLE CODE TABLE .
After completing the check, disconnect terminals Tc and E₁ of the DLC1 or 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 1st.

Fig 3: Identifying Blinking Patterns For Normal Code & Codes 11 & 21
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

In case of 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.
  HINT:
  
  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
In case of not using hand-held tester:
Clear the DTC.
1. Using SST, connect terminals Tc and E₁ of the DLC1 or Tc and CG of the DLC3.
  SST 09843-18020 or 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 sec.
4. Check that the warning light shows the normal code.
5. Remove the SST from the terminals of the DLC1 or DLC3.
  SST 09843-18020 or 09843-18040
  
  Fig 5: Depressing Brake Pedal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
In case of using 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 operator's manual.)
  
  Fig 6: Connecting Hand-Held Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DATA LIST

HINT:

According to the DATA LIST displayed by the hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting is one of the methods to shorten labor time.

Connect the hand-held tester to the DLC3.
Turn the ignition switch ON.

According to the display on the tester, read the "DATA LIST".

DATA LIST

Item	Measurement Item/Range (Display)	Normal Condition*	Diagnostic Note
HB MOT RELAY	HB Motor relay status/ ON or OFF	-	-
ABS MOT RELAY	Motor relay status/ ON or OFF	-	-
SOL RELAY	Solenoid relay status/ ON or OFF	-	-
PRESS HIGH	HIGH Hydraulic brake boost pressure/ ON or OFF	-	-
PRESS LOW	LOW Hydraulic brake boost pressure/ ON or OFF	-	-
VSC/TRC OFF SW	VSC OFF switch/ ON or OFF	-	-
IDLESW	Main idle switch/ ON or OFF	ON: Accelerator pedal released	-
IDLESW	Main idle switch/ ON or OFF	OFF: Accelerator pedal depressed	-
STOP LIGHT SW	Stop light switch/ ON or OFF	ON: Brake pedal released	-
STOP LIGHT SW	Stop light switch/ ON or OFF	OFF: Brake pedal depressed	-
PKB SW	PKB sw/ ON or OFF	ON: Parking brake applied	-
PKB SW	PKB sw/ ON or OFF	OFF: Parking brake released	-
ABS OPERT FR	Front Right wheel operation/ BEFORE or OPERATE	BEFORE: No ABS operation (FR) OPERATE: During ABS operation (FR)	-
ABS OPERT FL	Front Left wheel operation/ BEFORE or OPERATE	BEFORE: No ABS operation (FL) OPERATE: During ABS operation (FL)	-
ABS OPERT RR	Rear Right wheel operation/ BEFORE or OPERATE	BEFORE: No ABS operation (RR) OPERATE: During ABS operation (RR)	-
ABS OPRET RL	Rear Left wheel operation/ BEFORE or OPERATE	BEFORE: No ABS operation (RL) OPERATE: During ABS operation (RL)	-
WHEEL SPDFR	Front Right wheel speed / Min.: 0 km/h, Max.: 326.4 km/h	Actual wheel speed	Speed indicated on speedometer
WHEEL SPD FL	Front Left wheel speed/ Min.: 0 km/h, Max.: 326.4 km/h	Actual wheel speed	Speed indicated on speedometer
WHEEL SPDRR	Rear Right wheel speed/ Min.: 0 km/h, Max.: 326.4 km/h	Actual wheel speed	Speed indicated on speedometer
WHEEL SPD RL	Rear Left wheel speed/ Min.: 0 km/h, Max.: 326.4 km/h	Actual wheel speed	Speed indicated on speedometer
DECELERAT SENS	G sensor (GL1 filter)/ Min.: -1.869 G, Max.: 1.869	Approximately 0 +/- 0.13 G at still condition	Reading changes when vehicle is bounced
DECELERAT SENS2	G sensor (GL2 filter)/ Min.: -1.869 G, Max.: 1.869	Approximately 0 +/- 0.13 G at still condition	Reading changes when vehicle is bounced
IG VOLTAGE	ECU IG power voltage/ UNDER or NORMAL or OVER	-	-
SFRR	SFRR/ ON or OFF	-	-
SFRH	SFRH/ ON or OFF	-	-
SFLR	SFLR/ ON or OFF	-	-
SFLH	SFLH/ ON or OFF	-	-
SRRR (SRR)	SRRR (SRR)/ ON or OFF	-	-
SRRH (SRH)	SRRH (SRH)/ ON or OFF	-	-
SRLR	SRLR/ ON or OFF	-	-
SRLH	SRLH/ ON or OFF	-	-
SRCF (SA1)	SRCF (SA1)/ ON or OFF	-	-
SRCR (SA2)	SRCR (SA2)/ ON or OFF	-	-
SRMF (SMCF, SA3)	SRMF (SMCF, SA3)/ ON or OFF	-	-
SRMR (SMCR, STR)	SRMR (SMCR, STR)/ ON or OFF	-	-
THROTTLE	Throttle position sensor/ Min.: 0 deg, Max.: 125 deg	-	-
ENGINE SPD	Engine Speed/ Min.: 0 rpm, Max.: 6000 rpm	Actual engine speed	-
YAW RATE	Yaw rate sensor/ Min.: -128 deg/s, Max.: 128 deg/s	-	-
YAW ZERO VALUE	Memorized zero value/ Min.: -128 deg/s, Max.: 128 deg/s	-	-
STEERING ANG	Steering sensor/ Min.: -1682 deg, Max.: 1877 deg	-1682 to 1877 deg	Turning the steering wheel changes the value Left: Becomes grater Right: Becomes smaller
MAS CYL PRS 1	Master cylinder pressure 1/ Min.:0 V, Max.: 5 V	When brake pedal is released: 0.3 -0.9 V	Reading increases when brake pedal is depressed
AIR BLD SUPPORT	Air bleed support/ NOT SUP or SUPPORT	w/ BA: Supported w/ VSC: Not supported	-
TEST MODE	Test mode operation/ NORMAL or TEST	NORMAL: Normal mode TEST: During test mode	-
#CODES	Number of Trouble Code/ Min.: 0, Max.: 255	Min.: 0, Max.: 45	-

ACTIVE TEST

HINT:

Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the methods to shorten labor time.

It is possible to display the DATA LIST during the ACTIVE TEST.

Connect the hand-held tester to the DLC3.
Turn the ignition switch ON.

According to the display on the tester, perform the "ACTIVE TEST".

HINT:

IG must be turned ON to proceed the ACTIVE TEST using a hand-held tester.

*¹ : For VSC equipped vehicles only

ACTIVE TEST DETAIL

Item	Test Details	Diagnostic Note
SFRR	Turns ABS solenoid (SFRR) ON / OFF	Operation of solenoid (clicking sound) can be heard
SFRH	Turns ABS solenoid (SFRH) ON / OFF	Operation of solenoid (clicking sound) can be heard
SFLR	Turns ABS solenoid (SFLR) ON / OFF	Operation of solenoid (clicking sound) can be heard
SFLH	Turns ABS solenoid (SFLH) ON / OFF	Operation of solenoid (clicking sound) can be heard
SRRR	Turns ABS solenoid (SRRR) ON / OFF	Operation of solenoid (clicking sound) can be heard
SRRH	Turns ABS solenoid (SRRH) ON / OFF	Operation of solenoid (clicking sound) can be heard
SRLR	Turns ABS solenoid (SRLR) ON / OFF	Operation of solenoid (clicking sound) can be heard
SRLH	Turns ABS solenoid (SRLH) ON / OFF	Operation of solenoid (clicking sound) can be heard
SRCF (SA1)	Turns ABS solenoid (SRCF (SA1)) ON / OFF	Operation of solenoid (clicking sound) can be heard
SRCR (SA2)	Turns ABS solenoid (SRCR (SA2)) ON / OFF	Operation of solenoid (clicking sound) can be heard
SRMF (SMCF, SA3)	Turns ABS solenoid (SMCF, SA3)) ON / OFF	Operation of solenoid (clicking sound) can be heard
SRMR (SMCR, STR)	Turns ABS solenoid (SRMR (SMCR, STR)) ON / OFF	Operation of solenoid (clicking sound) can be heard
SFRR & SFRH	Turns ABS solenoid SFRR & SFRH ON / OFF	Operation of solenoid (clicking sound) can be heard
SFLR & SFLH	Turns ABS solenoid SFLR & SFLH ON / OFF	Operation of solenoid (clicking sound) can be heard
SRH & SRR	Turns ABS solenoid SRRR & SRRH ON / OFF	Operation of solenoid (clicking sound) can be heard
SRLR & SRLH	Turns ABS solenoid SRLR & SRLH ON / OFF	Operation of solenoid (clicking sound) can be heard
SFRH & SFLH	Turns ABS solenoid SFRH & SFLH ON / OFF	Operation of solenoid (clicking sound) can be heard
SRCF & SRCR	Turns ABS solenoid SRCF & SRCR ON / OFF	Operation of solenoid (clicking sound) can be heard
SRMF & SRMR	Turns ABS solenoid SRMF & SRMR ON / OFF	Operation of solenoid (clicking sound) can be heard
SOL RELAY	Turns ABS solenoid relay ON/OFF	Operation of solenoid (clicking sound) can be heard
ABS MOT RELAY	Turns ABS motor relay ON/OFF	Operation of motor (clicking sound) can be heard
TRAC MOT RELAY	Turns TRC motor relay ON/OFF	Operation of motor (clicking sound) can be heard
ABS WARN LIGHT	Turns ABS warning light ON / OFF	Observe combination meter
VSC WARN LIGHT	Turns VSC warning light ON / OFF	Observe combination meter
VSC/TRCOFFIND	Turns VSC / TRC OFF indicator ON / OFF	Observe combination meter
SLIP INDI LIGHT	Turns SLIP indicator light ON / OFF	Observe combination meter
BRAKE WRN LIGHT	Turns BRAKE warning light ON / OFF	Observe combination meter
VSC/BR WARN BUZ	Turns VSC / BRAKE warning buzzer ON / OFF	Buzzer can be heard

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 by the 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.
HINT:

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

Wheel speed sensor reading

Speed indicated on speedometer

STOP LIGHT SW

Stop light switch signal

Stop light switch ON: ON, OFF: OFF

#IGON

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

0 - 31

MAS CYL PRESS

Master cylinder pressure sensor reading

Brake pedal release: 0.3 to 0.9 V

Brake pedal depress: 0.8 to 4.5 V

MASS PRESS GRADE

Master cylinder pressure sensor change

-30 to 200 MPa/s

SYSTEM

System status

ABS activated: ABS

VSCATRC activated: VSCATRC

BA activated: BA

Fail safe mode activated: FAIL SF

No system activated: NO SYS

YAW RATE

Yaw rate angle sensor reading

-100 to 100

STEERING ANG

Steering sensor reading

Left turn: Increase

Right turn: Drop

THROTTLE

Throttle position sensor reading

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

G (RIGHT & LEFT)

Right and left G

-1.869 to 1.869

G (BACK & FORTH)

Back and forth G

-1.869 to 1.869

VSC (TRC) OFF SW

VSC OFF switch signal

TRAC OFF SW ON: ON

VSC (TRC) OFF SW

VSC OFF switch signal

OFF: OFF

SHIFT POSITION

Shift lever position

FAIL

P, N

THROTTLE

Throttle sensor reading

0 to 125 deg.

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

SPEED SENSOR SIGNAL CHECK (TEST MODE)
HINT:
- When replacing the yaw rate sensor or ECU, make sure to perform a yaw rate sensor zero point calibration.
- If the ignition switch is turned from the ON to the ACC or LOCK position during test mode, DTC will be erased.
1. In case of not using hand-held tester: Check the speed sensor signal.
  1. Turn the ignition switch OFF.
  2. Using SST, connect terminals Ts and E₁ of the DLC1.
    SST 09843-18020
  3. Start the engine.
    
    Fig 7: Identifying DLC1 Connectors
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Check that the ABS warning light blinks.
    HINT:
    
    If the ABS warning light does not blink, inspect the ABS warning light circuit and Ts circuit (See ABS WARNING LIGHT CIRCUIT and TS TERMINAL CIRCUIT ).
    
    Fig 8: Identifying Blinking Pattern Of ABS Warning Light
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Keep the vehicle in the stationary condition on the flat place for 6 sec. or more.
  6. Shift the transfer lever in the L4 position and turn the center diff. lock switch ON.
  7. Shift the transfer lever back.
  8. Leaving the vehicle in the stationary condition and the brake pedal in a free condition for 1 sec. or more, continue to depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 sec. or more.
  9. Leaving the vehicle in the stationary condition, depress the brake pedal with a force of 980 N (100 kgf, 221 lbf) or more quickly.
    HINT:
    
    At this time, the ABS warning light comes on for 3 sec.
  10. Drive the vehicle straight forward.
    When driving the vehicle with a speed faster than 28 mph (45 km/h) for several seconds, check that the ABS warning light goes off.
    
    HINT:
    
    There is a case that the sensor check is not completed if the vehicle has its wheels spun or its steering wheel turned during this check.
  11. Stop the vehicle.
  12. Using SST, connect terminals Tc and E₁ of the DLC1 or Tc and CG of the DLC3.
    SST 09843-18020 or 09843-18040
  13. Read the number of blinks of the ABS warning light.
    HINT:
    - See the list of DTC on the next page.
    - 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 1st.
  14. After doing the check, disconnect the SST from terminals of the DLC1 or terminals of the DLC1 and DLC3, and turn the ignition switch OFF.
    SST 09843-18020 or 09843-18040
    
    Fig 9: Identifying Blinking Pattern Of ABS Warning Light (Malfunction Code)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. In case of using hand-held tester:
  Check the sensor signal.
  1. Hook up the hand-held tester to the DLC3.
  2. Do step ( 3) to ( 10).
  3. Read the DTC by following the prompts on the tester screen.
    HINT:
    
    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 signal check function:

Fig 11: Problem Symptom Table
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

In case of not using hand-held tester:

VSC SENSOR CHECK (TEST MODE)

NOTE: When having replaced the yaw rate sensor, deceleration sensor and/or ECU, perform a zero point calibration of the yaw rate and deceleration sensors (See step 8.).

HINT:

If the ignition switch is turned from the ON to the 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 is in the P position, and turn the steering wheel to the neutral position.
3. Using SST, connect terminals Ts and E₁ of the DLC1.
  SST 09843-18020
  
  Fig 12: Identifying DLC1 Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Start the engine.
  
  Fig 13: Identifying Blinking Pattern Of VSC TRAC Warning Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Check that the VSC TRAC warning light blinks.
  HINT:
  
  If the VSC TRAC warning light does not blink, inspect the VSC TRAC warning light circuit and Ts terminal circuit (See VSC TRAC WARNING LIGHT CIRCUIT and TS TERMINAL CIRCUIT ).
  
  Turn the steering wheel either to the left or right 450° or more from the vehicle stationary condition, and turn back the steering wheel to the straight ahead position.
Keep the vehicle stationary on a level place for 1 sec. or more.

Fig 14: Identifying Start Position & End Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the yaw rate sensor.

Shift the shift lever to the D position and drive the vehicle at a vehicle speed of approx. 5 km/h (3 mph), turn the steering wheel either to the left or right 90° or more, and maintain this angle until the vehicle has turned 180°.

Stop the vehicle and shift the shift lever to the P position. Check that the VSC buzzer sounds for 3 sec.

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

If the VSC buzzer does not sound, do the sensor check again. If the VSC buzzer still does not sound, check the VSC buzzer circuit, then do the sensor check again.

TROUBLE AREA AND REFERENCE

Trouble Area	Reference
VSC buzzer circuit	Brake Warning and VSC Buzzer Circuit

HINT:

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

Read the DTC.
1. Using SST, connect terminals Tc and E₁ of the DLC1 or Tc and CG of the DLC3.
  SST 09843-18020 or 09843-18040
2. Read the number of times the VSC TRAC warning light blinks.
  HINT:
  - See the list of DTC shown on VSC SENSOR PROBLEM SYMPTOM .
  - 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 1st.
    
    Fig 15: Identifying Blinking Pattern Of VSC TRAC Warning Light (Malfunction Code)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. After doing the check, disconnect the SST from terminals of the DLC1 or terminals of the DLC1 and DLC3 and turn the ignition switch OFF.
  SST 09843-18020 or 09843-18040
  
  Fig 16: Connecting Hand-Held Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

In case of using hand-held tester:

CHECK VSC SENSOR SIGNAL

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

Hook up the hand-held tester to the DLC3.
Do steps (a)-( 2) and from (a)-( 4) to ( c).

Read the DTC by following the prompts on the tester screen.

HINT:

Please refer to the hand-held tester operator's manual for further details.

DTC of the VSC sensor check function:

VSC SENSOR PROBLEM SYMPTOM

Code No.	Diagnosis	Trouble Area
C0371/71	Yaw rate sensor output signal malfunction	bull Yaw rate sensor
C0371/71	Yaw rate sensor output signal malfunction	bull Yaw rate sensor circuit

IF NECESSARY, PERFORM ZERO POINT CALIBRATION OF YAW RATE AND DECELERATION SENSORS
HINT:
- When having replaced the yaw rate sensor, deceleration sensor or/and the ECU, make sure to perform a yaw rate and deceleration sensors zero point calibration.
- This operation is also required when the deceleration sensor or yaw rate sensor has been replaced since the calibrated zero point of both sensors will be erased.
NOTE:
- While obtaining the zero point, do not vibrate 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 point of the yaw rate and deceleration sensors.
  1. Shift the shift lever to P range.
  2. Turn the ignition switch ON in a stationary condition.
    
    Fig 17: Identifying DLC1 Connectors
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. With the ignition switch ON, using SST, repeat a cycle of short and open between terminals Ts and EI of the DLC 14 times or more within 8 sec. Check that the VSC warning light is lit indicating the recorded zero point is erased.
    SST 09843-18020
  4. Turn the ignition switch OFF.
2. Obtain the zero point of the yaw rate sensor.
  1. Disconnect terminals Ts and E₁ of the DLC1.
  2. Turn the ignition switch ON.
    HINT:
    
    The vehicle should be in a stationary condition with the shift lever in the P position.
  3. Check that the lighted VSC warning light goes off about 15 sec. after the ignition switch is turned ON.
    HINT:
    
    Even if the ignition is not turned OFF in step (a)-( 4) and remains ON, a yaw rate sensor zero point calibration can be completed. In this case, the VSC warning light is lit about 15 sec. and starts blinking. (Normal code)
  4. After ensuring that the VSC warning light remains OFF for 2 sec., turn the ignition switch OFF.
    HINT:
    
    If the ignition switch is not turned OFF in step (a)-( 4), ensure the blinking of the VSC warning light for 2 sec. and turn the ignition switch OFF.
3. Perform a deceleration sensor zero point calibration.
  NOTE: After step ( b) (a yaw rate sensor zero point calibration), the VSC warning light goes off. At this time, if the vehicle is driven without performing step ( c) (a deceleration sensor zero point calibration), deceleration sensor zero point calibration malfunction will be detected and the VSC warning light will light up. Therefore, perform step ( c) right after step ( b).
  
  Fig 18: Identifying DLC1 Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Using SST, connect terminals Ts and E₁ of the DLC1.
    SST 09843-18020
  2. Turn the ignition switch ON.
    HINT:
    
    Keep the vehicle in a stationary condition with the shift lever in the P position.
    
    Fig 19: Identifying Blinking Pattern Of VSC Warning Light
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 disconnect terminals Ts and E₁ of the DLC1.
    SST 09843-18020