VEHICLE STABILITY CONTROL 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.

When the engine switch is turned on (IG), check that the ABS warning, brake system warning (red indicator), VSC OFF indicator and slip indicator lights all come on and the TRC OFF message will be displayed on the multi-information display for approximately 3 seconds.

Tech Tips

If the skid control ECU (brake actuator assembly) stores any DTCs, the ABS warning and slip indicator lights will come on.
If any of the indicators remain on or do 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 system warning light (red indicator) circuit (Remains on)	Click here
Brake system warning light (red indicator) circuit (Does not come on)	Click here
Multi-information display (TRC OFF indicator) circuit (Remains on)	Click here
Multi-information display (TRC OFF indicator) 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

After replacement of the brake actuator assembly and/or yaw rate sensor, perform zero point calibration of the yaw rate and acceleration sensor.

Tech Tips

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 (brake actuator assembly) 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 GTS to the DLC3.
5. Turn the engine switch on (IG).
6. Turn the GTS on.
7. Switch the skid control ECU (brake actuator assembly) to Test Mode using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.
8. Check that the ABS warning light and slip indicator light come on for several seconds and then blink in the test mode pattern (0.125 seconds on and 0.125 seconds off).
  
  Tech Tips
  
  If the ABS warning and slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning and slip indicator light circuits.
9. 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
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, 22.0 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 is illuminated, 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 brake pedal operation above is performed.
Speed Sensor Check
1. Drive the vehicle straight-ahead.
  
  Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds.
2. Check that the ABS warning light goes off.
  Tech Tips
  - 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.
3. 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.
  Tech Tips
  
  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.
VSC signal check
1. VSC OFF Switch Check
  1. Briefly press the VSC OFF switch.
  2. Check that the VSC OFF indicator light comes on.
  3. Briefly press the VSC OFF switch again.
  4. Check that the VSC OFF indicator light off.
End of Sensor Check
1. If the signal check is completed, the ABS warning light and slip indicator light blink (0.125 seconds on and 0.125 seconds off) when the vehicle is stopped and turn off while the vehicle is being driven.
  Note
  - When the acceleration sensor, speed sensor, and master cylinder pressure sensor checks are completed, the signal check is completed.
  - If the signal check is not completed, the ABS warning light blinks while driving and the ABS does not operate.
Read 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 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.
  Tech Tips
  
  See "Sensor Check DTCs".
2. Turn the engine switch off and disconnect the GTS.

Sensor Check DTCs

ABS Sensor
DTC Code	Detection Item	Trouble Area
C1270	Initialization Incomplete	ECM Front steering control ECU (VGRS ECU) Rear steering control ECU (DRS ECU) CAN communication system (Skid control ECU to ECM, front steering control ECU (VGRS ECU) or rear steering control ECU (DRS ECU) Skid control ECU (Brake actuator assembly)
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 Acceleration sensor (Yaw rate sensor)
C1281	Master Cylinder Pressure Sensor Output Malfunction	Stop light switch Harness or connector Brake pedal load sensing switch (Brake pedal support assembly) Master cylinder pressure sensor (Brake actuator assembly)

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

After replacement of the brake actuator assembly and/or yaw rate sensor, perform zero point calibration of the yaw rate and acceleration sensor.

Tech Tips

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 (brake actuator assembly) 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. Text in Illustration
  
  *1 DLC3
  
  Using SST, connect terminals TS and CG of the DLC3.
  
  SST
  
  09843-18040
5. Turn the engine switch on (IG).
6. Check that the ABS warning light and slip indicator light come on for several seconds and then blink in the test mode pattern (0.125 seconds on and 0.125 seconds off).
  
  Tech Tips
  
  If the ABS warning and slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning and slip indicator light circuits.
7. 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
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, 22.0 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 is illuminated, 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 brake pedal operation above is performed.
Speed Sensor Check
1. Drive the vehicle straight-ahead.
  
  Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds.
2. Check that the ABS warning light goes off.
  Tech Tips
  - 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.
3. 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.
  Tech Tips
  
  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.
VSC signal check
1. VSC OFF Switch Check
  1. Briefly press the VSC OFF switch.
  2. Check that the VSC OFF indicator light comes on.
  3. Briefly press the VSC OFF switch again.
  4. Check that the VSC OFF indicator light off.
End of Sensor Check
1. If the signal check is completed, the ABS warning light and slip indicator light blink (0.125 seconds on and 0.125 seconds off) when the vehicle is stopped and turn off while the vehicle is being driven.
  Note
  - When the 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
  
  *1 DLC3
  
  Using SST, connect terminals TS, TC and CG of the DLC3.
  
  SST
  
  09843-18040
2. Count the number of blinks of the ABS warning light.
  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.
  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 engine switch off.
4. Turn the engine switch on (IG).
  Tech Tips
  - 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.

Text in Illustration
*1	DLC3

Text in Illustration
*1	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	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 Acceleration sensor (Yaw rate sensor)
81	Master Cylinder Pressure Sensor Output Malfunction	Stop light switch Harness or connector Brake pedal load sensing switch (Brake pedal support assembly) Master cylinder pressure sensor (Brake actuator assembly)
88	Initialization Incomplete	ECM Front steering control ECU (VGRS ECU) Rear steering control ECU (DRS ECU) CAN communication system (Skid control ECU to ECM, front steering control ECU (VGRS ECU) or rear steering control ECU (DRS ECU)) Skid control ECU (Brake actuator assembly)

Tech Tips

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