VEHICLE STABILITY CONTROL SYSTEM TEST MODE PROCEDURE

WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

1. 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 comes on.

2. 

   Text in Illustration

   *1	ABS Warning Light
   *2	Brake Warning Light
   *3	TRC OFF Indicator Light
   *4	Slip Indicator Light
   *5	VSC OFF Indicator Light

   When the ignition switch is turned to ON, check that the ABS warning, brake warning, VSC OFF indicator and TRC OFF indicator, Slip indicator lights come on for approximately 3 seconds.

   Tech Tips

   
   

   • If the brake actuator assembly (skid control ECU) 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 warning light circuit (Remains on)	Click here
   Brake warning light circuit (Does not come on)	Click here
   TRC indicator light circuit (Remains on)	Click here
   TRC indicator light circuit (Does not come on)	Click here
   VSC indicator light circuit (Remains on)	Click here
   VSC 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 Intelligent Tester)

1. Procedure to enter Test Mode.

   
   

   1. Turn the ignition switch off.

   2. Check that the steering wheel is in the straight-ahead position.

   3. Check that the shift lever is in P.

   4. Connect the intelligent tester to the DLC3.

   5. Turn the ignition switch to ON.

   6. Turn the intelligent tester on.

   7. Switch the brake actuator assembly (skid control ECU) to Test Mode using the intelligent tester. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.

   8. 

      Text in Illustration

      *a	Blinking Pattern in Test Mode
      *b	0.125 Seconds

      Check that the ABS warning and Slip indicator lights come on for several seconds and then blink in the Test Mode blinking pattern.

      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.

      Trouble Area	See procedure
      TS and CG terminal circuit	Click here
      ABS warning light circuit (Remains on)	Click here
      ABS warning 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

DECELERATION SENSOR CHECK (When Using Intelligent Tester)

1. Keep the vehicle stationary on a level surface for 1 second or more.

   Tech Tips

   The deceleration sensor check can be performed with the master cylinder pressure sensor check below.

MASTER CYLINDER PRESSURE SENSOR CHECK (When Using Intelligent Tester)

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 of 98 N (10 kgf, 22 lbf) or more for 1 second.

2. Check that the ABS warning light stays on for 3 seconds.

   Tech Tips

   
   

   • Ensure 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 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 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 is insufficient, the brake warning light may come on in accordance with booster pressure control. In this case, run the engine at idle to obtain sufficient vacuum.

SPEED SENSOR CHECK (When Using Intelligent Tester)

VSC OFF SWITCH CHECK

1. Briefly press the VSC OFF switch.

2. Check that the VSC OFF indicator light light on.

3. Briefly press the VSC OFF switch again to turn the VSC OFF indicator light off.

END OF SENSOR CHECK (When Using Intelligent Tester)

1. 

   Text in Illustration

   *a	Blinking Pattern in Test Mode
   *b	0.125 Seconds

   If the sensor check is completed, the ABS warning light blinks and Slip indicator blinks (Test Mode) when the vehicle stops and the ABS warning light is off while the vehicle is being driven.

   Note

   
   

   • When the yaw rate sensor, deceleration 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 blinks even while the vehicle is being driven and the ABS does not operate.

READ DTC OF SIGNAL CHECK FUNCTION (When Using Intelligent Tester)

1. Read the DTC(s) by following the tester screen.

   Note

   
   

   • If only the DTCs are displayed, repair the malfunction area 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.

2. List of DTCs.

   ABS Sensor

   DTC Code	Detection Item	Trouble Area
   C1271	Low output signal from front speed sensor RH	Front speed sensor RH Sensor installation Speed sensor rotor
   C1272	Low output signal from front speed sensor LH	Front speed sensor LH Sensor installation Speed sensor rotor
   C1273	Low output signal from rear speed sensor RH	Rear speed sensor RH Sensor installation Speed sensor rotor
   C1274	Low output signal from rear speed sensor LH	Rear speed sensor LH Sensor installation Speed sensor rotor
   C1275	Abnormal change in output signal from front speed sensor RH	Speed sensor rotor
   C1276	Abnormal change in output signal from front speed sensor LH	Speed sensor rotor
   C1277	Abnormal change in output signal from rear speed sensor RH	Speed sensor rotor
   C1278	Abnormal change in output signal from rear speed sensor LH	Speed sensor rotor
   C1279	Deceleration sensor output voltage malfunction	Yaw rate sensor Sensor installation
   C1281	Master cylinder pressure sensor output malfunction	Stop light switch Master cylinder pressure sensor

   VSC Sensor

   DTC Code	Detection Item	Trouble Area
   C1473	Yaw rate sensor	Yaw rate sensor

   Tech Tips

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

3. Turn the ignition switch off and disconnect the intelligent tester.

SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When not Using Intelligent Tester)

1. Procedure to enter Test Mode.

   
   

   1. Turn the ignition switch off.

   2. Check that the steering wheel is in the straight-ahead position.

   3. Check that the shift lever is in P.

   4. 

      Text in Illustration

      *a	Front view of DLC3

      Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

      SST

      09843-18040

   5. Turn the ignition switch to ON.

   6. 

      Text in Illustration

      *a	Blinking Pattern in Test Mode
      *b	0.125 Seconds

      Check that the ABS warning and Slip indicator lights come on for several seconds and then blink in Test Mode.

      Tech Tips

      If the ABS warning and Slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning and VSC OFF indicator light circuits.

      Trouble Area	See procedure
      TS and CG terminal circuit	Click here
      ABS warning light circuit (Remains on)	Click here
      ABS warning 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

DECELERATION SENSOR CHECK (When not Using Intelligent Tester)

1. Keep the vehicle stationary on a level surface for 1 second or more.

   Tech Tips

   The deceleration sensor check can be performed with the master cylinder pressure sensor check below.

MASTER CYLINDER PRESSURE SENSOR CHECK (When not Using Intelligent Tester)

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 of 98 N (10 kgf, 22 lbf) or more for 1 second.

2. Check that the ABS warning light stays on for 3 seconds.

   Tech Tips

   
   

   • Ensure 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 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 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 is insufficient, the brake warning light may come on in accordance with booster pressure control. In this case, run the engine at idle to obtain sufficient vacuum.

SPEED SENSOR CHECK (When not Using Intelligent Tester)

VSC OFF SWITCH CHECK

1. Briefly press the VSC OFF switch.

2. Check that the VSC OFF indicator light on.

3. Briefly press the VSC OFF switch again to turn the VSC OFF indicator light off.

END OF SENSOR CHECK (When not Using Intelligent Tester)

1. 

   Text in Illustration

   *a	Blinking Pattern in Test Mode
   *b	0.125 Seconds

   If the sensor check is completed, the ABS warning light blinks and Slip indicator blinks (Test Mode) when the vehicle stops and the ABS warning light is off while the vehicle is being driven.

   Note

   
   

   • When the yaw rate sensor, deceleration 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 driven and the ABS will not operate.

READ DTC OF SIGNAL CHECK FUNCTION (When not Using Intelligent Tester)

1. 

   Text in Illustration

   *a	Front view of DLC3

   Using SST, connect terminals 12 (TS), 13 (TC) and 4 (CG) of the DLC3.

   SST

   09843-18040

2. Count the number of blinks of the ABS warning and VSC OFF indicator lights.

   

   Text in Illustration

   *a	Blinking Pattern in Normal System Code	*b	Blinking Pattern in Trouble Code (Example Codes 11 and 21)
   *c	2 Seconds	*d	0.25 Seconds
   *e	4 Seconds	*f	1.5 Seconds
   *g	2.5 Seconds	*h	0.5 Seconds
   *i	Repeat	-	-

   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 the list of DTCs (See procedure "A").

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.

4. Turn the ignition switch to ON.

   Tech Tips

   
   

   • If the ignition switch is not turned to ON after SST is removed from the DLC3, the previous Test Mode will continue.

   • If the ignition switch is turned to ON with terminals TS and CG shorted, the previous Test Mode will continue.

DTC OF TEST MODE (SIGNAL CHECK) FUNCTION (Procedure "A")