Test Mode Procedure

VEHICLE STABILITY CONTROL SYSTEM: TEST MODE PROCEDURE

TEST MODE PROCEDURE

1. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

(a) Release the parking brake.

NOTE: Before releasing the parking brake, move the shift lever to the P position for safety.

HINT: When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light comes on.

(b) When the ignition switch is turned to the ON position, check that the ABS warning, BRAKE warning, VSC warning, VSC OFF indicator, and SLIP indicator lights come on for approximately 3 seconds.

HINT: If the ECU stores a DTC, the ABS warning, BRAKE warning, VSC warning, VSC OFF indicator, and SLIP indicator lights will come on.

If the indicator remains on or does not come on, proceed to troubleshooting for the light circuits listed below.

2. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (TECHSTREAM)

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

HINT:
- If the ignition switch is turned from ON to ACC or LOCK during Test Mode (signal check), DTCs of the signal check function will be erased.
- During Test Mode (signal check), the skid control ECU records all DTCs of the signal check function. By performing the Test Mode (signal check), the codes are erased if a normal condition is confirmed. The remaining codes are the codes where an abnormality was found.

(a) Procedure to enter Test Mode.
(1) Turn the ignition switch off.
(2) Connect Techstream to the DLC3.
(3) Check that the steering wheel is centered and move the shift lever to the P position.
(4) Turn the ignition switch to the ON position.
(5) Set Techstream to Test Mode (select "Signal Check").

HINT: Refer to the Techstream operator's manual for further details.

(6) Check that the ABS warning and VSC warning lights blink in Test Mode.

HINT: If the ABS and VSC warning lights do not blink, inspect the TS and CG terminal circuit, and ABS and VSC warning light circuits.

(7) Check the ABS sensor.

HINT: Check that the ABS warning light is blinking in Test Mode and perform the check.

3. ACCELERATION SENSOR CHECK (TECHSTREAM)
(a) Keep the vehicle stationary on a level surface for 1 second or more.

HINT: Acceleration sensor check can be performed with the master cylinder pressure sensor check below.

4. MASTER CYLINDER PRESSURE SENSOR CHECK (TECHSTREAM)
(a) 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.
(b) Check that the ABS warning light stays on for 3 seconds.

HINT:
- 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 brake pedal operation above is performed.
- If the check of the master cylinder pressure sensor is not completed, depressing the brake pedal causes further decrease in the negative pressure, making the sensor check difficult to be completed.
- If the negative pressure is insufficient, the master cylinder pressure sensor check may not be completed. In this case, run the engine at idle to obtain sufficient negative pressure.
- If the brake pedal is strongly depressed when the negative pressure is insufficient, the BRAKE warning light may come on in accordance with the booster pressure control. In this case, run the engine at idle to obtain sufficient negative pressure.

5. SPEED SENSOR CHECK (TECHSTREAM)
(a) Check the speed sensor signal.
(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.

HINT: The sensor check may not be completed if wheelspin occurs.

(b) Stop the vehicle.

NOTICE:
- 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 and if the vehicle speed exceeds 80 km/h (50 mph), a signal check code will be stored again. Accelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
- If the signal check has not been completed, the ABS warning light blinks while driving and the ABS system does not operate.

HINT: When the sensor check has been completed, the ABS warning light goes off while driving and blinks in the Test Mode pattern while stationary.

(c) Check the VSC sensor.
Check that the VSC warning light is blinking in Test Mode and perform the check.

6. YAW RATE SENSOR CHECK (TECHSTREAM)

(a) Check the output of the yaw rate sensor.
(1) Keep the vehicle in a stationary condition on a level surface for 1 second or more.
(2) Move the shift lever from P to the D position and drive the vehicle at a speed of approximately 5 km/h (3 mph), and turn the steering wheel either to the left or right 90° or more until the vehicle makes a 180° turn.
(3) Stop the vehicle and move the shift lever to the P position. Check that the skid control buzzer sounds for 3 seconds.

- If the skid control buzzer sounds, the sensor check is completed normally.
- If the skid control buzzer does not sound, check the skid control buzzer circuit ([1][2]Skid Control Buzzer Circuit), then perform the sensor check again.
- If the skid control buzzer still does not sound, there is a malfunction in the yaw rate sensor, so check the DTC.
- Make a 180° turn. At the end of the turn, the direction of the vehicle should be within 180° ±5° of its start position.
- Do not spin the wheels.
- Do not turn the ignition switch off while turning.
- Do not move the shift lever to the P position while turning, but changing in the vehicle speed, stopping, or driving in reverse is possible.
- Complete the turn within 20 seconds.

7. END OF SENSOR CHECK (TECHSTREAM)

(a) If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle stops and the ABS warning light is off while the vehicle is driving.

- 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 is not completed, the ABS warning light blinks even while the vehicle is driving and the ABS does not operate.

8. READ DTC OF SIGNAL CHECK FUNCTION (TECHSTREAM)
(a) Read the DTC(s) by following the tester screen.

NOTICE:
- If only the DTCs are displayed, repair the malfunction area and clear the DTCs.
- If the DTCs or Test Mode codes (DTC of signal check function) are displayed, repair the malfunction area, clear the DTCs and perform the Test Mode inspection.

HINT: See the list of DTC (See procedure "A").

9. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (SST CHECK WIRE)

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

HINT:
- If the ignition switch is turned from ON to ACC or LOCK during Test Mode (signal check), DTCs of the signal check function will be erased.
- During Test Mode (signal check), the skid control ECU records all DTCs of the signal check function. By performing the Test Mode (signal check), the codes are erased if a normal condition is confirmed. The remaining codes are the codes where an abnormality was found.

(a) Procedure to enter Test Mode.
(1) Turn the ignition switch off.
(2) Check that the steering wheel is centered and move the shift lever to the P position.

(3) Using SST, connect terminals TS and CG of the DLC3.
SST: 09843-18040

(4) Turn the ignition switch to the ON position.

(5) Check that the ABS warning and VSC warning lights blink in Test Mode.

HINT: If the ABS and VSC warning lights do not blink, inspect the TS and CG terminal circuit, and ABS and VSC warning light circuits.

(6) Check the ABS sensor.

HINT: Check that the ABS warning light is blinking in Test Mode and perform the check.

10. ACCELERATION SENSOR CHECK (SST CHECK WIRE)
(a) Keep the vehicle stationary on a level surface for 1 second or more.

HINT: Acceleration sensor check can be performed with the master cylinder pressure sensor check below.

11. MASTER CYLINDER PRESSURE SENSOR CHECK (SST CHECK WIRE)
(a) 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.
(b) Check that the ABS warning light stays on for 3 seconds.

HINT:
- 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 check of the master cylinder pressure sensor is not completed, depressing the brake pedal causes further decrease in the negative pressure, making the sensor check difficult to be completed.
- If the negative pressure is insufficient, the master cylinder pressure sensor check may not be completed. In this case, run the engine at idle to obtain sufficient negative pressure.
- If the brake pedal is strongly depressed when the negative pressure is insufficient, the BRAKE warning light may come on in accordance with the booster pressure control. In this case, run the engine at idle to obtain sufficient negative pressure.

12. SPEED SENSOR CHECK (SST CHECK WIRE)
(a) Check the speed sensor signal.
(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.

HINT: The sensor check may not be completed if wheelspin occurs.

(b) Stop the vehicle.

NOTICE:
- 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 vehicle speed exceeds 80 km/h (50 mph), a signal check code will be stored again. Accelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
- If the signal check has not been completed, the ABS warning light blinks while driving and the ABS system does not operate.

HINT: When the sensor check has been completed, the ABS warning light goes off while driving and blinks in the Test Mode pattern while stationary.

(c) Check the VSC sensor.
Check that the VSC warning light is blinking in Test Mode and perform the check.

13. YAW RATE SENSOR CHECK (SST CHECK WIRE)

(a) Check the output of the yaw rate sensor.
(1) Keep the vehicle stationary on a level surface for 1 second or more.
(2) Move the shift lever from P to the D position and drive the vehicle at a vehicle speed of approximately 5 km/h (3 mph) and turn the steering wheel either to the left or right 90° or more and until the vehicle makes a 180° turn.
(3) Stop the vehicle and move the shift lever to the P position. Check that the skid control buzzer sounds for 3 seconds.

- If the skid control buzzer sounds, the sensor check is completed normally.
- If the skid control buzzer does not sound, check the skid control buzzer circuit ([1][2]Skid Control Buzzer Circuit), then perform the sensor check again.
- If the skid control buzzer still does not sound, there is a malfunction in the yaw rate sensor, so check the DTC.
- Make a 180° turn. At the end of the turn, the direction of the vehicle should be within 180° ±5° of its start position.
- Do not spin the wheels.
- Do not turn the ignition switch off while turning.
- Do not move the shift lever to the P position while turning, but changing in the vehicle speed, stopping, or driving in reverse is possible.
- Complete the turn within 20 seconds.

14. END OF SENSOR CHECK (SST CHECK WIRE)

(a) Using SST, connect terminals TC and CG of the DLC3.
SST: 09843-18040

(b) Count the number of blinks of the ABS warning and VSC warning lights.

NOTICE:
- If only the DTCs are displayed, repair the malfunction area and clear the DTCs.
- If the DTCs or Test Mode codes (DTC of signal check function) are displayed, repair the malfunction area, clear the DTCs and perform the Test Mode inspection.

HINT:
- If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.
- See the list of DTC (See procedure "A").

(c) After performing the check, disconnect the SST from terminals TS and CG, and TC and CG of the DLC3 and turn the ignition switch off.
(d) Turn the ignition switch to the ON position.

HINT:
- If the ignition switch is not turned to the ON position after the SST is removed from the DLC3, the previous Test Mode will continue.
- If the ignition switch is turned to the ON position with terminals TS and CG shorted, the previous Test Mode will continue.

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

ABS sensor:

VSC sensor:

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