ELECTRONICALLY CONTROLLED BRAKE SYSTEM 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.

Tech Tips

When the parking brake is applied or the brake fluid level is low, the brake warning light / red (malfunction) comes on.

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

Tech Tips

When the ignition switch is turned ON (IG), check that the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction), TRC OFF indicator, VSC OFF indicator and slip indicator lights come on until the ignition switch is turned ON (READY).
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
TRC OFF indicator light circuit (Remains on)	Click here
TRC OFF indicator light circuit (Does not come on)	Click here
VSC OFF indicator light circuit (Remains on)	Click here
VSC OFF indicator light 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 ignition switch is turned from (IG) to 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 as the normal condition for each item is confirmed. The remaining codes are the codes where an abnormality was found.

Procedure to enter Test Mode
1. Turn the ignition switch off.
2. Check that the steering wheel is centered.
3. Check that the parking brake is released.
4. Check that the shift lever is in P.
5. Connect the GTS to the DLC3.
6. Turn the ignition switch to ON (IG).
7. Turn the GTS on.
8. Switch the skid control ECU to Test Mode using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.
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 2 seconds 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 stays on for 3 seconds.
  Tech Tips
  - Confirm that the ABS warning light comes on.
  - While the ABS warning light stays 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 OFF Switch Check
1. Check that the TRC OFF indicator light comes on and the VSC OFF indicator light goes off.
2. Press the VSC OFF switch.
3. Check that the TRC OFF indicator light goes off and the VSC OFF indicator light comes on.
4. Press the VSC OFF switch again.
End of Sensor Check
1. When the sensor checks have completed, the ABS warning light goes off while driving, 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 DTC(s) by following the GTS screen.
  Note
  - If only DTCs other than Test Mode sensor check DTCs are displayed, repair the malfunction 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 malfunction, clear the DTCs, and perform the Test Mode inspection again.
  Tech Tips
  
  See "Sensor Check DTCs".
2. Turn the ignition switch off and disconnect the GTS.

Sensor Check DTCs

ABS Sensor
DTC No.	Detection Item	Trouble Area
C1271	Low Output Signal of Front Speed Sensor RH	Front speed sensor RH Sensor installation Front speed sensor rotor RH (Front axle hub bearing RH)
C1272	Low Output Signal of Front Speed Sensor LH	Front speed sensor LH Sensor installation Front speed sensor rotor LH (Front axle hub bearing LH)
C1273	Low Output Signal of Rear Speed Sensor RH	Rear speed sensor RH (Rear axle hub and bearing assembly RH) Sensor installation Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)
C1274	Low Output Signal of Rear Speed Sensor LH	Rear speed sensor LH (Rear axle hub and bearing assembly LH) 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 bearing RH)
C1276	Abnormal Change in Output Signal of Front Speed Sensor LH	Front speed sensor LH Front speed sensor rotor LH (Front axle hub bearing LH)
C1277	Abnormal Change in Output Signal of Rear Speed Sensor RH	Rear speed sensor RH (Rear axle hub and bearing assembly 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 axle hub and bearing assembly LH) Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)
C1279	Acceleration Sensor Output Voltage Malfunction	Sensor installation Yaw rate and acceleration sensor (Airbag sensor assembly)
C1281	Master Cylinder Pressure Sensor Output Malfunction	Stop light switch assembly Regulator pressure sensor (Brake booster with master cylinder assembly)

Electronically Controlled Brake System Sensor
DTC No.	Detection Item	Trouble Area
C1346	Stroke Sensor Zero Point Learning Malfunction	Brake pedal stroke sensor assembly Brake pedal stroke sensor assembly circuit

Tech Tips

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

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

Note

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

Tech Tips

If the ignition switch is turned from ON (IG) to 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 as the normal condition for each item is confirmed. The remaining codes are the codes where an abnormality was found.

Procedure to enter Test Mode
1. Turn the ignition switch off.
2. Check that the steering wheel is centered.
3. Check that the parking brake is released.
4. Check that the shift lever is in P.
5. Text in Illustration
  
  *a Front view of DLC3
  
  Using SST, connect terminals TS and CG of the DLC3.
  
  SST
  
  09843-18040
6. Turn the ignition switch to ON (IG).
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 2 seconds 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 stays on for 3 seconds.
  Tech Tips
  - Confirm that the ABS warning light comes on.
  - While the ABS warning light stays 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 OFF Switch Check
1. Check that the TRC OFF indicator light comes on and the VSC OFF indicator light goes off.
2. Press the VSC OFF switch.
3. Check that the TRC OFF indicator light goes off and the VSC OFF indicator light comes on.
4. Press the VSC OFF switch again.
End of Sensor Check
1. When the sensor checks have completed, the ABS warning light goes off while driving, 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. Text in Illustration
  
  *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 ignition switch off.
  Tech Tips
  - If the ignition switch is not turned off and back ON (IG) after SST is removed from the DLC3, the previous Test Mode will continue.
  - If the ignition switch is turned back ON(IG) with terminals TS and CG connected, the previous Test Mode will continue.

Text in Illustration
*a	Front view of DLC3

Text in Illustration
*a	Front view of DLC3

Sensor Check DTCs

ABS Sensor
DTC No.	Detection Item	Trouble Area
71	Low Output Signal of Front Speed Sensor RH	Front speed sensor RH Sensor installation Front speed sensor rotor RH (Front axle hub bearing RH)
72	Low Output Signal of Front Speed Sensor LH	Front speed sensor LH Sensor installation Front speed sensor rotor LH (Front axle hub bearing LH)
73	Low Output Signal of Rear Speed Sensor RH	Rear speed sensor RH (Rear axle hub and bearing assembly RH) Sensor installation Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)
74	Low Output Signal of Rear Speed Sensor LH	Rear speed sensor LH (Rear axle hub and bearing assembly LH) 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 bearing RH)
76	Abnormal Change in Output Signal of Front Speed Sensor LH	Front speed sensor LH Front speed sensor rotor LH (Front axle hub bearing LH)
77	Abnormal Change in Output Signal of Rear Speed Sensor RH	Rear speed sensor RH (Rear axle hub and bearing assembly 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 axle hub and bearing assembly LH) Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)
79	Acceleration Sensor Output Voltage Malfunction	Sensor installation Yaw rate and acceleration sensor (Airbag sensor assembly)
81	Master Cylinder Pressure Sensor Output Malfunction	Stop light switch assembly Regulator pressure sensor (Brake booster with master cylinder assembly)

Electronically Controlled Brake System Sensor
DTC No.	Detection Item	Trouble Area
71	Stroke Sensor Zero Point Learning Malfunction	Brake pedal stroke sensor assembly Brake pedal stroke sensor assembly circuit

Tech Tips

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