ELECTRONICALLY CONTROLLED BRAKE SYSTEM TEST MODE PROCEDURE

WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

Release the parking brake.

Note

When releasing the parking brake, push the P position switch (transmission shift main switch) 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 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

If the skid control ECU 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 Intelligent Tester)

Note

Before performing the master cylinder pressure sensor check or yaw rate sensor zero point voltage 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 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 an abnormality was found.

Procedure to enter the Test Mode
1. Turn the power switch off.
2. Check that the steering wheel is centered.
3. Check that the parking brake is released.
4. Check that park (P) is selected.
5. Connect the intelligent tester to the DLC3.
6. Turn the power switch on (IG).
7. Turn the intelligent tester on.
8. Switch the skid control ECU to Test Mode using the intelligent tester. 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 Test Mode.
  
  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.
10. Check the ABS sensors.
  
  Tech Tips
  
  Check that the ABS warning light is blinking in the Test Mode blinking pattern before performing the ABS sensor check.
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 with the master cylinder pressure sensor check 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 be completed 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 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 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.
3. Check the VSC sensor.
  
  Tech Tips
  
  Check that the brake warning / yellow (minor malfunction) and slip indicator lights are blinking in the Test Mode blinking pattern before performing the VSC sensor check.
Yaw Rate Sensor Zero Point Voltage Check

Note

Before performing the yaw rate sensor zero point voltage check, perform linear valve offset learning.
1. Check that park (P) is selected.
2. Keep the vehicle stationary on a level surface for 1 second or more.
3. Check that the brake warning light / yellow (minor malfunction) blinks.
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 all 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 has not been completed, the ABS warning light will blink while driving and the ABS will not operate.
Read Sensor Check DTCs
1. Read the DTC(s) by following the intelligent tester 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 power switch off and disconnect the intelligent tester.

Sensor Check DTCs

ABS Sensor
DTC Code	Detection Item	Trouble Area
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	Front speed sensor RH Speed sensor rotor
C1276	Abnormal Change in Output Signal of Front Speed Sensor LH	Front speed sensor LH Speed sensor rotor
C1277	Abnormal Change in Output Signal of Rear Speed Sensor RH	Rear speed sensor RH Speed sensor rotor
C1278	Abnormal Change in Output Signal of Rear Speed Sensor LH	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 Regulator pressure sensor

Electronically Controlled Brake System Sensor
DTC Code	Detection Item	Trouble Area
C1346	Stroke Sensor Zero Point Learning Malfunction	Brake pedal stroke sensor Brake pedal stroke sensor 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 Intelligent Tester)

Note

Before performing the master cylinder pressure sensor check or yaw rate sensor zero point voltage 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 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 an abnormality was found.

Procedure to enter Test Mode
1. Turn the power switch off.
2. Check that the steering wheel is centered.
3. Check that the parking brake is released.
4. Check that park (P) is selected.
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 power switch 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 Test Mode.
  
  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 blinking pattern before performing the ABS sensor check.
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 with the master cylinder pressure sensor check 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 be completed 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 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 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.
3. Check the VSC sensor.
  
  Tech Tips
  
  Check that the brake warning / yellow (minor malfunction) and slip indicator lights are blinking in the Test Mode blinking pattern before performing the VSC sensor check.
Yaw Rate Sensor Zero Point Voltage Check

Note

Before performing the yaw rate sensor zero point voltage check, perform linear valve offset learning.
1. Check that park (P) is selected.
2. Keep the vehicle stationary on a level surface for 1 second or more.
3. Check that the brake warning light / yellow (minor malfunction) blinks.
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 has not been completed, the ABS warning light will blink while driving and the ABS will not operate.
Read 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 the 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 the 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 on (IG) after SST is removed from the DLC3, the previous Test Mode will continue.
  - If the power switch is turned 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 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	Front speed sensor RH Speed sensor rotor
76	Abnormal Change in Output Signal of Front Speed Sensor LH	Front speed sensor LH Speed sensor rotor
77	Abnormal Change in Output Signal of Rear Speed Sensor RH	Rear speed sensor RH Speed sensor rotor
78	Abnormal Change in Output Signal of Rear Speed Sensor LH	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 Regulator pressure sensor

Electronically Controlled Brake System Sensor
DTC Code	Detection Item	Trouble Area
71	Stroke Sensor Zero Point Learning Malfunction	Brake pedal stroke sensor Brake pedal stroke sensor circuit

Tech Tips

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