Test Mode Procedure

WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

Release the parking brake
NOTE: Before releasing the parking brake, move the shift lever to P for safety.

HINT

When the parking brake is applied or the brake fluid level is low, the brake warning light comes on

When the engine switch is turned on (IG), check that the ABS warning, brake warning, VSC OFF indicator, slip indicator and master caution indicator lights all come on for approximately 3 seconds.

HINT

If the skid control ECU stores any DTCs, the ABS warning, brake warning, slip indicator and master caution indicator lights will come on and the DTC will be displayed on the multi-information display

If any of the indicators remain on or do not come on, proceed to troubleshooting for the light circuits listed below

TROUBLE AREA CHART

Trouble Area	See Procedure
ABS warning light circuit (Remains on)	ABS WARNING LIGHT REMAINS ON
ABS warning light circuit (Does not come on)	ABS WARNING LIGHT DOES NOT COME ON
Brake warning light circuit (Remains on)	BRAKE WARNING LIGHT REMAINS ON
Brake warning light circuit (Does not come on)	BRAKE WARNING LIGHT DOES NOT COME ON
VSC warning light (Master caution indicator light and multi-information display) circuit (Remains on)	VSC WARNING LIGHT REMAINS ON
VSC warning light (Master caution indicator light and multi-information display) circuit (Does not come on)	VSC WARNING LIGHT DOES NOT COME ON
VSC OFF indicator light circuit (Remains on)	VSC OFF INDICATOR LIGHT REMAINS ON
VSC OFF indicator light circuit (Does not come on)	VSC OFF INDICATOR LIGHT DOES NOT COME ON
Slip indicator light circuit (Remains on)	SLIP INDICATOR LIGHT REMAINS ON
Slip indicator light circuit (Does not come on)	SLIP INDICATOR LIGHT DOES NOT COME ON

SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using the Techstream)

NOTE: After replacement of the skid control ECU and/or yaw rate and acceleration sensor, perform zero point calibration of the yaw rate and acceleration sensor.

HINT

If the engine switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs recorded during the sensor check will be cleared

Fig 1: Identifying ABS Warning, Brake Warning, VSC OFF Indicator, Slip Indicator And Master Caution Indicator Lights
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
During Test Mode (signal check), the skid control ECU records all DTCs detected in the sensor check By performing Test Mode (signal check), the codes are cleared if a normal condition is confirmed The remaining codes are the codes where a malfunction was found

Procedure to enter Test Mode
1. Turn the engine switch off.
2. Check that the steering wheel is centered
3. Check that the shift lever is in P
4. Connect the Techstream to the DLC3.
5. Turn the engine switch on (IG).
6. Turn the Techstream on.
7. Switch the skid control ECU to Test Mode using the Techstream. Enter the following menus" Chassis / ABS/VSC/TRAC / Utility / Signal Check.
8. Check that the ABS warning and master caution indicator lights come on for several seconds and then blink in Test Mode and the VSC test mode message is displayed on the multi-information display
  
  Fig 2: Identifying Test Mode Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT
  - Illustrations may differ from the actual screen displayed depending on the specifications of the vehicle and customized settings.
  - If the ABS warning and master caution indicator lights do not blink and/or the VSC test mode message is not displayed on the multi-information display, inspect the TS and CG terminal circuit and ABS warning and VSC warning (master caution indicator light and multi-information display) light circuits.
9. Check the ABS sensors
  HINT
  
  Check that the ABS warning light is blinking in the Test Mode blinking pattern before performing the ABS sensor check
Lost Booster Pressure Judgement Check and Master Cylinder Pressure Sensor Zero Point Calibration
NOTE: Perform a check in the lost booster pressure state (vacuum in the booster is depressurized).

Fig 3: Identifying Test Mode Blinking Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Turn the engine switch on (IG)
2. Check that the brake warning light comes on when depressing the brake pedal with a force greater than 59 N (6 kgf, 13.2 lbf) for 1 second or more (The lost booster pressure state is judged as normal)
3. Start the engine while depressing the brake pedal with a force greater than 59 N (6 kgf, 13 2 lbf) for 1 second or more
4. Check that the brake warning light goes off when quickly releasing the brake pedal (The lost booster pressure state is judged as normal)
5. Leave the vehicle for 1 second or more (Master cylinder pressure sensor zero point calibration)
  NOTE:
  - If depressing the brake pedal slowly or repeatedly, the master cylinder pressure sensor zero point calibration is not performed normally.
  - If the lost booster pressure judgement check results are not normal, then the master cylinder pressure sensor check can not be performed.
  - If rechecking after the engine has started, end Test Mode, enter Test Mode again, and release vacuum in the booster by pumping the brake pedal prior to rechecking.
Acceleration Sensor Check
1. Keep the vehicle stationary on a level surface for 1 second or more
  HINT
  
  The acceleration sensor check can be performed with the master cylinder pressure sensor check below
Master Cylinder Pressure Sensor Check
1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, then quickly and continuously depress the brake pedal with a force greater than 98 N (10 kgf, 22 lbf) for 1 second.
2. Check that the ABS warning light stays on for 3 seconds.
  HINT
  - Confirm that the ABS warning light comes on
  - While the ABS warning light is illuminated, continue to depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more.
  - The ABS warning light comes on for 3 seconds every time the brake pedal operation above is performed
  - If the master cylinder pressure sensor check is not completed, depressing the brake pedal causes further decreases in vacuum in the brake booster, making the sensor check difficult to complete
  - If the vacuum remaining in the booster is insufficient, the master cylinder pressure sensor check may not be completed. In this case, run the engine at idle to obtain sufficient vacuum
  - If the brake pedal is strongly depressed when the vacuum in the booster is insufficient, the brake warning light may come on in accordance with the booster pressure control. In this case, run the engine at idle to obtain sufficient vacuum
Speed Sensor Check
1. Drive the vehicle in reverse for more than 1 second at 3 km/h (2 mph) or more (Reverse signal check).
2. Check that the ABS warning light goes off
  HINT
  
  Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check can not be completed if the vehicle speed is 45 km/h (28 mph) or more
3. Drive the vehicle straight-ahead
  Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds (Forward signal check).
4. Check that the ABS warning light goes off
  HINT
  - The sensor check may not be completed if wheelspin occurs
  - The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed.
  - The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
5. Stop the vehicle
  NOTE:
  - Before performing the speed sensor check, complete the acceleration sensor and master cylinder pressure sensor checks.
  - The speed sensor check may not be completed if the speed sensor check is started while turning the steering wheel or spinning the wheels.
  - After the ABS warning light goes off, if the vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
  - If the sensor check has not been completed, the ABS warning light will blink while driving and the ABS will not operate.
  HINT
  
  When the sensor check has been completed, the ABS warning light goes off while driving and blinks in the Test Mode pattern while the vehicle is stationary
6. Check the VSC sensor
  
  Fig 4: Identifying Test Mode Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT
  - Illustrations may differ from the actual screen displayed depending on the specifications of the vehicle and customized settings
  - Check that the master caution indicator light is blinking in the Test Mode blinking pattern and/or the VSC test mode message is displayed on the multi-information display before performing the VSC sensor check
Yaw Rate Sensor Check
1. Keep the vehicle in a stationary condition on a level surface for 1 second or more
2. Move the shift lever from P to D and drive the vehicle at a speed of approximately 5 km/h (3 mph), and turn the steering wheel either to the left or right 90° or more until the vehicle makes a 180° turn
3. Stop the vehicle and move the shift lever to P. Check that the skid control buzzer sounds for 3 seconds
  HINT
  - If the skid control buzzer sounds, the sensor check has completed normally
  - If the skid control buzzer does not sound, check the skid control buzzer circuit (See SKID CONTROL BUZZER CIRCUIT ), then perform the sensor check again
    
    Fig 5: Identifying Yaw Rate Sensor
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - If the skid control buzzer still does not sound, the yaw rate sensor may be malfunctioning Check for DTCs
  - 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 allow the wheels to spin
  - Do not turn the engine switch off while turning
  - Do not move the shift lever to P while turning, but changing the vehicle speed, stopping, or driving in reverse is acceptable
  - Complete the turn within 20 seconds
End of Sensor Check
1. If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle is stopped and goes off while the vehicle is driving
  NOTE:
  - When the yaw rate sensor, acceleration sensor, speed sensor, and master cylinder pressure sensor checks are completed, the sensor check is completed.
  - If the sensor check is not completed, the ABS warning light will blink even while the vehicle is driving and the ABS will not operate.
    
    Fig 6: Identifying Test Mode Blinking Pattern
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Read Sensor Check DTCs
1. Read the DTC(s) by following the Techstream screen
  NOTE:
  - If only DTCs other than Test Mode sensor check DTCs are displayed, repair the malfunctions and clear the DTCs.
  - If Test Mode sensor check DTCs and other DTCs are displayed or if only Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform Test Mode inspection again.
  HINT
  
  See "Sensor Check DTCs".
2. Turn the engine switch off and disconnect the Techstream

Sensor Check DTCs

ABS Sensor

DTC CODE REFERENCE

DTC Code	Detection Item	Trouble Area
C1270	Initialization Incomplete	ECM CAN communication system (Skid control ECU to ECM) Skid control ECU
C1271	Low Output Signal of Front Speed Sensor RH	Front speed sensor RH Sensor installation Speed sensor rotor
C1272	Low Output Signal of Front Speed Sensor LH	Front speed sensor LH Sensor installation Speed sensor rotor
C1273	Low Output Signal of Rear Speed Sensor RH	Rear speed sensor RH Sensor installation Speed sensor rotor
C1274	Low Output Signal of Rear Speed Sensor LH	Rear speed sensor LH Sensor installation Speed sensor rotor
C1275	Abnormal Change in Output Signal of Front Speed Sensor RH	Speed sensor rotor
C1276	Abnormal Change in Output Signal of Front Speed Sensor LH	Speed sensor rotor
C1277	Abnormal Change in Output Signal of Rear Speed Sensor RH	Speed sensor rotor
C1278	Abnormal Change in Output Signal of Rear Speed Sensor LH	Speed sensor rotor
C1279	Acceleration Sensor Output Voltage Malfunction	Sensor installation Yaw rate and acceleration sensor
C1281	Master Cylinder Pressure Sensor Output Malfunction	Stop light switch Brake pedal load sensing switch Master cylinder pressure sensor

VSC Sensor

DTC CODE REFERENCE

DTC Code	Detection Item	Trouble Area
C0371	Yaw Rate Sensor	Yaw rate and acceleration sensor

HINT

The codes in this table are output only in Test Mode (signal check)

SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When not Using the Techstream)

NOTE: After replacement of the skid control ECU and/or yaw rate and acceleration sensor, perform zero point calibration of the yaw rate and acceleration sensor.

HINT

If the engine switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs recorded during the sensor check will be cleared.
During Test Mode (signal check), the skid control ECU records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared if a normal condition is confirmed. The remaining codes are the codes where a malfunction was found

Procedure to enter Test Mode
1. Turn the engine switch off.
2. Check that the steering wheel is centered.
3. Check that the shift lever is in P.
4. Using SST, connect terminals TS and CG of the DLC3.
  SST 09843-18040
  
  Fig 7: Identifying Terminals TS And CG Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Turn the engine switch on (IG)
6. Check that the ABS warning and master caution indicator lights come on for several seconds and then blink in Test Mode and the VSC test mode message is displayed on the multi-information display.
  
  Fig 8: Identifying Test Mode Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  - Illustrations may differ from the actual screen displayed depending on the specifications of the vehicle and customized settings.
  - If the ABS warning and master caution indicator lights do not blink and/or the VSC test mode message is not displayed on the multi-information display, inspect the TS and CG terminal circuit and ABS warning and VSC warning (master caution indicator light and multi-information display) light circuits.
7. Check the ABS sensors.
  HINT
  
  Check that the ABS warning light is blinking in the Test Mode blinking pattern before performing the ABS sensor check.
Lost Booster Pressure Judgement Check and Master Cylinder Pressure Sensor Zero Point Calibration
NOTE: Perform a check in the lost booster pressure state (vacuum in the booster is depressurized).

Fig 9: Identifying Test Mode Blinking Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Turn the engine switch on (IG).
2. Check that the brake warning light comes on when depressing the brake pedal with a force greater than 59 N (6 kgf, 13.2 lbf) for 1 second or more. (The lost booster pressure state is judged as normal.)
3. Start the engine while depressing the brake pedal with a force greater than 59 N (6 kgf, 13.2 lbf) for 1 second or more.
4. Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged as normal.)
5. Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)
  NOTE:
  - If depressing the brake pedal slowly or repeatedly, the master cylinder pressure sensor zero point calibration is not performed normally.
  - If the lost booster pressure judgement check results are not normal, then the master cylinder pressure sensor check can not be performed.
  - If rechecking after the engine has started, end Test Mode, enter Test Mode again, and release vacuum in the booster by pumping the brake pedal prior to rechecking.
Acceleration Sensor Check
1. Keep the vehicle stationary on a level surface for 1 second or more
  HINT
  
  The acceleration sensor check can be performed with the master cylinder pressure sensor check below.
Master Cylinder Pressure Sensor Check
1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, then quickly and continuously depress the brake pedal with a force greater than 98 N (10 kgf, 22 lbf) for 1 second.
2. Check that the ABS warning light stays on for 3 seconds.
  HINT
  - Confirm that the ABS warning light comes on
  - While the ABS warning light is illuminated, continue to depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more.
  - The ABS warning light comes on for 3 seconds every time the brake pedal operation above is performed
  - If the master cylinder pressure sensor check is not completed, depressing the brake pedal causes further decreases in vacuum in the brake booster, making the sensor check difficult to complete
  - If the vacuum remaining in the booster is insufficient, the master cylinder pressure sensor check may not be completed. In this case, run the engine at idle to obtain sufficient vacuum
  - If the brake pedal is strongly depressed when the vacuum in the booster is insufficient, the brake warning light may come on in accordance with the booster pressure control. In this case, run the engine at idle to obtain sufficient vacuum.
Speed Sensor Check
1. Drive the vehicle in reverse for more than 1 second at 3 km/h (2 mph) or more (Reverse signal check)
2. Check that the ABS warning light goes off
  HINT
  
  Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check can not be completed if the vehicle speed is 45 km/h (28 mph) or more
3. Drive the vehicle straight-ahead. Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds (Forward signal check).
4. Check that the ABS warning light goes off.
  HINT
  - The sensor check may not be completed if wheelspin occurs.
  - The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed
  - The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check
5. Stop the vehicle
  NOTE:
  - Before performing the speed sensor check, complete the acceleration sensor and master cylinder pressure sensor checks.
  - The speed sensor check may not be completed if the speed sensor check is started while turning the steering wheel or spinning the wheels.
  - After the ABS warning light goes off, if the vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
  - If the sensor check has not been completed, the ABS warning light will blink while driving and the ABS will not operate.
  HINT
  
  When the sensor check has been completed, the ABS warning light goes off while driving and blinks in the Test Mode pattern while the vehicle is stationary
6. Check the VSC sensor
  
  Fig 10: Identifying Test Mode Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT
  - Illustrations may differ from the actual screen displayed depending on the specifications of the vehicle and customized settings
  - Check that the master caution indicator light is blinking in the Test Mode blinking pattern and/or the VSC test mode message is displayed on the multi-information display before performing the VSC sensor check.
Yaw Rate Sensor Check
1. Keep the vehicle in a stationary condition on a level surface for 1 second or more
2. Move the shift lever from P to D and drive the vehicle at a speed of approximately 5 km/h (3 mph), and turn the steering wheel either to the left or right 90° or more until the vehicle makes a 180° turn
3. Stop the vehicle and move the shift lever to P Check that the skid control buzzer sounds for 3 seconds.
  
  Fig 11: Identifying Yaw Rate Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT
  - If the skid control buzzer sounds, the sensor check has completed normally
  - If the skid control buzzer does not sound, check the skid control buzzer circuit (See SKID CONTROL BUZZER CIRCUIT ), then perform the sensor check again
  - If the skid control buzzer still does not sound, the yaw rate sensor may be malfunctioning Check for DTCs.
  - 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 allow the wheels to spin.
  - Do not turn the engine switch off while turning
  - Do not move the shift lever to P while turning, but changing the vehicle speed, stopping, or driving in reverse is acceptable.
  - Complete the turn within 20 seconds
End of Sensor Check
1. If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle is stopped and goes off while the vehicle is driving
  NOTE:
  - When the yaw rate sensor, acceleration sensor, speed sensor, and master cylinder pressure sensor checks are completed, the sensor check is completed.
  - If the sensor check is not completed, the ABS warning light will blink even while the vehicle is driving and the ABS will not operate.
    
    Fig 12: Identifying Test Mode Blinking Pattern
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Read Sensor Check DTCs
1. Using SST, connect terminals TC and CG of the DLC3
  SST 09843-18040
  
  Fig 13: Identifying Terminals TC And CG Of DLC
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Count the number of blinks of the ABS warning light and read the VSC diagnosis message displayed on the multi-information display.
  
  Fig 14: Identifying Normal System Code And Trouble Code Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - If only DTCs other than Test Mode sensor check DTCs are displayed, repair the malfunctions and clear the DTCs.
  - If Test Mode sensor check DTCs and other DTCs are displayed or if only Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform Test Mode inspection again.
  HINT
  - If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.
  - Illustrations may differ from the actual screen displayed depending on the specifications of the vehicle and customized settings.
  - See "Sensor Check DTCs".
3. After performing the check, disconnect SST from terminals TS and CG, and TC and CG of the DLC3 and turn the engine switch off.
4. Turn the engine switch on (IG).
  HINT
  - If the engine switch is not turned on (IG) after SST is removed from the DLC3, the previous Test Mode will continue.
  - If the engine switch is turned on (IG) with terminals TS and CG connected, the previous Test Mode will continue

Sensor Check DTCs

ABS Sensor

DTC CODE REFERENCE

DTC Code	Detection Item	Trouble Area
71	Low Output Signal of Front Speed Sensor RH	Front speed sensor RH Sensor installation Speed sensor rotor
72	Low Output Signal of Front Speed Sensor LH	Front speed sensor LH Sensor installation Speed sensor rotor
73	Low Output Signal of Rear Speed Sensor RH	Rear speed sensor RH Sensor installation Speed sensor rotor
74	Low Output Signal of Rear Speed Sensor LH	Rear speed sensor LH Sensor installation Speed sensor rotor
75	Abnormal Change in Output Signal of Front Speed Sensor RH	Speed sensor rotor
76	Abnormal Change in Output Signal of Front Speed Sensor LH	Speed sensor rotor
77	Abnormal Change in Output Signal of Rear Speed Sensor RH	Speed sensor rotor
78	Abnormal Change in Output Signal of Rear Speed Sensor LH	Speed sensor rotor
79	Acceleration Sensor Output Voltage Malfunction	Sensor installation Yaw rate and acceleration sensor
81	Master Cylinder Pressure Sensor Output Malfunction	Stop light switch Brake pedal load sensing switch Master cylinder pressure sensor
88	Initialization Incomplete	ECM CAN communication system (Skid control ECU to ECM) Skid control ECU

VSC Sensor

DTC CODE REFERENCE

DTC Code	Detection Item	Trouble Area
71	Yaw Rate Sensor	Yaw rate and acceleration sensor

HINT

The codes in this table are output only in Test Mode (signal check)