ELECTRONICALLY CONTROLLED BRAKE SYSTEM TEST MODE PROCEDURE

WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

When the power switch is turned on (IG), check that the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights come on until the power switch is turned on (READY).

Tech Tips

When the power switch is turned on (IG), the VSC OFF indicator light comes on for approximately 3 seconds.
When the brake fluid level is low, the brake warning light / red (malfunction) comes on.
If the skid control ECU assembly stores any DTCs, the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights will come on.
If any of the indicators remains on or does not come on, proceed to troubleshooting for the light circuits listed below.

Trouble Area	See Procedure
ABS warning light circuit (Remains on)	Click here
ABS warning light circuit (Does not come on)	Click here
Brake warning light / red (malfunction) circuit (Remains on)	Click here
Brake warning light / red (malfunction) circuit (Does not come on)	Click here
Brake warning light / yellow (minor malfunction) circuit (Remains on)	Click here
Brake warning light / yellow (minor malfunction) circuit (Does not come on)	Click here
Slip indicator light circuit (Remains on)	Click here
Slip indicator light circuit (Does not come on)	Click here

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

Note

Before performing the master cylinder pressure sensor check, perform linear valve offset learning.

Tech Tips

If the power 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 assembly records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared as the normal condition for each item is confirmed. The remaining codes are the codes where an abnormality was found.
When entering Test Mode, the skid control ECU assembly communicates with the driving support ECU assembly to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Test Mode within 5 seconds of entering Test Mode (w/ Pre-collision System).

Procedure to Enter Test Mode
1. Turn the power switch off.
2. Check that the steering wheel is centered.
3. Check that the shift lever is in P.
4. Check that the parking brake is applied.
5. Connect the GTS to the DLC3.
6. Turn the power switch on (IG).
7. Turn the GTS on.
8. Switch the skid control ECU assembly to Test Mode using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.
  
  Chassis > ABS/VSC/TRC > Utility
  
  Tester Display
  
  Signal Check
  
  Tech Tips
  
  Do not exit Test Mode within 5 seconds of entering Test Mode. If Test Mode is exited within 5 seconds of entering Test Mode, DTC U1104 may be stored. If DTC U1104 is output after exiting Test Mode, enter Test Mode again, wait at least 5 seconds, then recheck for DTCs (w/ Pre-collision System).
9. Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.
  
  Tech Tips
  
  If the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights do not blink, inspect the ABS warning, brake warning / yellow (minor malfunction) and slip indicator light circuits.
10. Check the ABS sensors.
  
  Tech Tips
  
  Check that the ABS warning light is blinking in the Test Mode pattern before performing the following ABS sensor checks.
Acceleration Sensor Check
1. Keep the vehicle stationary on a level surface for 1 second or more.
  
  Tech Tips
  
  The acceleration sensor check can be performed by following the master cylinder pressure sensor check procedure below.
Master Cylinder Pressure Sensor Check

Note

Before performing the master cylinder pressure sensor check, perform linear valve offset learning.
1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force greater than 98 N (10 kgf, 22.0 lbf) for 1 second.
2. Check that the ABS warning light remains on for 3 seconds.
  Tech Tips
  - Confirm that the ABS warning light comes on.
  - While the ABS warning light remains on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) or more.
  - The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
Speed Sensor Check

Note

Before performing the speed sensor check, complete the acceleration sensor and master cylinder pressure sensor checks.
1. Drive the vehicle straight-ahead.
  
  Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds and check that the ABS warning light goes off.
  Tech Tips
  - The sensor check may not complete if wheelspin occurs.
  - The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
2. Stop the vehicle.
  Note
  - The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel or spinning the wheels.
  - After the ABS warning light goes off, if 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 completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate.
VSC Sensor Check
1. Check that the brake warning / yellow (minor malfunction) and slip indicator lights are blinking in the Test Mode pattern before performing the following VSC sensor check.
VSC OFF Switch (Combination Switch Assembly) Check
1. Press the VSC OFF switch (combination switch assembly).
2. Check that the TRC OFF message is displayed on the multi-information display.
3. Press the VSC OFF switch (combination switch assembly) again.
4. Check that the TRC OFF message is not displayed on the multi-information display.
End of Sensor Check
1. When the sensor checks have completed, the ABS warning light goes off while the vehicle is being driven, and blinks in the Test Mode pattern while the vehicle is stopped.
  
  Note
  
  When the acceleration sensor, speed sensor and master cylinder pressure sensor checks complete, the sensor check is complete.
  
  If the sensor checks have not completed, the ABS warning light will keep blinking while the vehicle is being driven, and the ABS will not operate.
Reading Sensor Check DTCs
1. Read the DTCs by following the GTS screen.
  Note
  - If only DTCs other than Test Mode sensor check DTCs are output, repair the malfunction and clear the DTCs.
  - If Test Mode sensor check DTCs and other DTCs are output or if only Test Mode sensor check DTCs are output, repair the malfunction, clear the DTCs, and perform the Test Mode inspection again.
  Tech Tips
  
  See Sensor Check DTCs.
2. Turn the power switch off and disconnect the GTS.

Tester Display
Signal Check

Sensor Check DTCs

ABS Sensor
DTC No.	Detection Item	Trouble Area
C1271	Low Output Signal of Front Speed Sensor RH	Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Front speed sensor rotor RH (Front axle hub sub-assembly RH)
C1272	Low Output Signal of Front Speed Sensor LH	Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Front speed sensor rotor LH (Front axle hub sub-assembly LH)
C1273	Low Output Signal of Rear Speed Sensor RH	Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)
C1274	Low Output Signal of Rear Speed Sensor LH	Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)
C1275	Abnormal Change in Output Signal of Front Speed Sensor RH	Front speed sensor RH Front speed sensor rotor RH (Front axle hub sub-assembly RH)
C1276	Abnormal Change in Output Signal of Front Speed Sensor LH	Front speed sensor LH Front speed sensor rotor LH (Front axle hub sub-assembly LH)
C1277	Abnormal Change in Output Signal of Rear Speed Sensor RH	Rear speed sensor RH Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)
C1278	Abnormal Change in Output Signal of Rear Speed Sensor LH	Rear speed sensor LH Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)
C1279	Acceleration Sensor Output Voltage Malfunction	Zero point calibration undone Improperly connected connector, deformation or corrosion of terminals Acceleration sensor (Yaw rate and acceleration sensor) internal stuck malfunction Acceleration sensor (Yaw rate and acceleration sensor) installed improperly
C1281	Master Cylinder Pressure Sensor Output Malfunction	Open or short in master cylinder pressure sensor Open or short in stop light switch assembly Stop light switch assembly stuck off malfunction

Electronically Controlled Brake System Sensor
DTC No.	Detection Item	Trouble Area
C1346	Stroke Sensor Zero Point Learning Malfunction	Brake pedal stroke sensor zero point calibration incomplete (Initialization and calibration of linear solenoid valve incomplete) Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Brake pedal stroke sensor assembly

Tech Tips

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

SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using SST Check Wire)

Note

Before performing the master cylinder pressure sensor check, perform linear valve offset learning.

Tech Tips

If the power 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 assembly records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared as the normal condition for each item is confirmed. The remaining codes are the codes where an abnormality was found.
When entering Test Mode, the skid control ECU assembly communicates with the driving support ECU assembly to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Test Mode within 5 seconds of entering Test Mode (w/ Pre-collision System).

Procedure to Enter Test Mode
1. Turn the power switch off.
2. Check that the steering wheel is centered.
3. Check that the shift lever is in P.
4. Check that the parking brake is applied.
5. *a Front view of DLC3
  
  Using SST, connect terminals TS and CG of the DLC3.
  
  SST
  
  09843-18040
6. Turn the power switch on (IG).
  
  Tech Tips
  
  Do not exit Test Mode within 5 seconds of entering Test Mode. If Test Mode is exited within 5 seconds of entering Test Mode, DTC U1104 may be stored. If DTC U1104 is output after exiting Test Mode, enter Test Mode again, wait at least 5 seconds, then recheck for DTCs (w/ Pre-collision System).
7. Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.
  
  Tech Tips
  
  If the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning, brake warning / yellow (minor malfunction) and slip indicator light circuits.
8. Check the ABS sensors.
  
  Tech Tips
  
  Check that the ABS warning light is blinking in the Test Mode pattern before performing the following ABS sensor checks.
Acceleration Sensor Check
1. Keep the vehicle stationary on a level surface for 1 second or more.
  
  Tech Tips
  
  The acceleration sensor check can be performed by following the master cylinder pressure sensor check procedure below.
Master Cylinder Pressure Sensor Check

Note

Before performing the master cylinder pressure sensor check, perform linear valve offset learning.
1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force greater than 98 N (10 kgf, 22.0 lbf) for 1 second.
2. Check that the ABS warning light remains on for 3 seconds.
  Tech Tips
  - Confirm that the ABS warning light comes on.
  - While the ABS warning light remains on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) or more.
  - The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
Speed Sensor Check

Note

Before performing the speed sensor check, complete the acceleration sensor and master cylinder pressure sensor checks.
1. Drive the vehicle straight-ahead.
  
  Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds and check that the ABS warning light goes off.
  Tech Tips
  - The sensor check may not complete if wheelspin occurs.
  - The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
2. Stop the vehicle.
  Note
  - The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel or spinning the wheels.
  - After the ABS warning light goes off, if 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 completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate.
VSC Sensor Check
1. Check that the brake warning / yellow (minor malfunction) and slip indicator lights are blinking in the Test Mode pattern before performing the following VSC sensor check.
VSC OFF Switch (Combination Switch Assembly) Check
1. Press the VSC OFF switch (combination switch assembly).
2. Check that the TRC OFF message is displayed on the multi-information display.
3. Press the VSC OFF switch (combination switch assembly) again.
4. Check that the TRC OFF message is not displayed on the multi-information display.
End of Sensor Check
1. When the sensor checks have completed, the ABS warning light goes off while the vehicle is being driven, and blinks in the Test Mode pattern while the vehicle is stopped.
  
  Note
  
  When the acceleration sensor, speed sensor and master cylinder pressure sensor checks complete, the sensor check is complete.
  
  If the sensor checks have not completed, the ABS warning light will keep blinking while the vehicle is being driven, and the ABS will not operate.
Reading Sensor Check DTCs
1. *a Front view of DLC3
  
  Using SST, connect terminals TC and CG of the DLC3.
  
  SST
  
  09843-18040
2. Count the number of blinks of the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights.
  Tech Tips
  - How to read DTCs:
    
    Diagnostic trouble codes are represented by the number of blinks of a warning light. For example, code 21 would be shown by 2 blinks, a pause of 1.5 seconds, and then 1 blink.
  - If one code is detected:
    
    The light repeats the same code after a pause of 4 seconds.
  - If multiple codes are detected:
    
    The light outputs one code after another with a 2.5-second pause between each code. When all codes have been output, there is a 4-second pause and then the light begins to output the codes again.
  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 the Test Mode inspection again.
  Tech Tips
  - If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.
  - 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 power switch off.
  Tech Tips
  - If the power switch is not turned off and back on (IG) after SST is removed from the DLC3, the previous Test Mode will continue.
  - If the power switch is turned back on (IG) with terminals TS and CG connected, the previous Test Mode will continue.

Sensor Check DTCs

ABS Sensor
DTC No.	Detection Item	Trouble Area
71	Low Output Signal of Front Speed Sensor RH	Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Front speed sensor rotor RH (Front axle hub sub-assembly RH)
72	Low Output Signal of Front Speed Sensor LH	Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Front speed sensor rotor LH (Front axle hub sub-assembly LH)
73	Low Output Signal of Rear Speed Sensor RH	Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)
74	Low Output Signal of Rear Speed Sensor LH	Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)
75	Abnormal Change in Output Signal of Front Speed Sensor RH	Front speed sensor RH Front speed sensor rotor RH (Front axle hub sub-assembly RH)
76	Abnormal Change in Output Signal of Front Speed Sensor LH	Front speed sensor LH Front speed sensor rotor LH (Front axle hub sub-assembly LH)
77	Abnormal Change in Output Signal of Rear Speed Sensor RH	Rear speed sensor RH Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)
78	Abnormal Change in Output Signal of Rear Speed Sensor LH	Rear speed sensor LH Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)
79	Acceleration Sensor Output Voltage Malfunction	Zero point calibration undone Improperly connected connector, deformation or corrosion of terminals Acceleration sensor (Yaw rate and acceleration sensor) internal stuck malfunction Acceleration sensor (Yaw rate and acceleration sensor) installed improperly
81	Master Cylinder Pressure Sensor Output Malfunction	Open or short in master cylinder pressure sensor Open or short in stop light switch assembly Stop light switch assembly stuck off malfunction

Electronically Controlled Brake System Sensor
DTC No.	Detection Item	Trouble Area
71	Stroke Sensor Zero Point Learning Malfunction	Brake pedal stroke sensor zero point calibration incomplete (Initialization and calibration of linear solenoid valve incomplete) Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Brake pedal stroke sensor assembly

Tech Tips

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