Test Mode Procedure

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: TEST MODE PROCEDURE

TEST MODE PROCEDURE

1. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK
(a) Release the parking brake.
NOTICE:
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 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 OFF indicator, and SLIP indicator lights stay on for approximately 3 seconds.
- If the skid control ECU has any stored DTCs, the ABS warning, brake warning, and SLIP indicator lights come on and the VSC OFF indicator light blinks.
- If the indicator does not come on or blink, check if the bulb is defective, and also check the wire harness between the skid control ECU and the combination meter.
- 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 (for Using an Techstream)
(a) When having replaced the skid control ECU 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 the ON position to the ACC or LOCK position during test mode (sensor check), DTCs recorded during the sensor check will be erased.
- During test mode (sensor check), the skid control ECU records all DTCs of the sensor check function. By performing the test mode (sensor check), the codes are erased if the items they are related to are confirmed to be normal. The remaining codes are the codes that relate to items which could not be confirmed to be normal.

(b) 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 the P position.
(4) Connect the Techstream to the DLC3.
(5) Turn the ignition switch to the ON position.
(6) Turn the Techstream on.
(7) Switch to the skid control ECU to test mode using the Techstream. Enter following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check.

(8) Check that the ABS warning and VSC OFF indicator lights blink (test mode).
HINT: If the ABS warning and VSC OFF indicator lights do not blink, inspect the ABS warning and/or VSC OFF indicator light circuit.

3. LOST BOOSTER PRESSURE JUDGEMENT CHECK AND MASTER CYLINDER PRESSURE SENSOR ZERO POINT CALIBRATION (for Using an Techstream)
NOTICE:
Perform the check in the lost booster pressure state (negative pressure in the booster is depressurized).

(a) Turn the ignition switch to the ON position.
(b) Check that the brake warning light comes on when depressing the brake pedal with a force of 59 N (6 kgf, 13.2 lbf) or more for 1 second or more. (The lost booster pressure state is judged normal.)
(c) Start the engine depressing the brake pedal with a force of 59 N (6 kgf, 13.2 lbf) or more for 1 second or more.
(d) Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged normal.)
(e) Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)
NOTICE:
- If the brake pedal is slowly depressed or depressed again, master cylinder pressure sensor zero point calibration is not performed normally.
- If lost booster pressure judgement check is not completed normally, master cylinder pressure sensor check is not judged.
- If recheck is performed after the engine has started, end the test mode, transit to the test mode again, and release the vacuum in the booster by pumping the brake pedal prior to the recheck.

4. ACCELERATION SENSOR CHECK (for Using an 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.

5. MASTER CYLINDER PRESSURE SENSOR CHECK (for Using an Techstream)
(a) Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second or more.
(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.

6. SPEED SENSOR CHECK (for Using an Techstream)
(a) Check the speed sensor signal.
(1) Drive the vehicle straight-ahead. Drive the vehicle at a speed of 28 mph (45 km/h) or more for several seconds and check that the ABS warning light goes off.
HINT: The sensor check may not be completed if wheel spin occurs, or if the steering wheel is turned during this check.

(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 50 mph (80 km/h), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 50 mph (80 km/h).
- If the sensor 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.

7. YAW RATE SENSOR CHECK (for Using an Techstream)
(a) Check the zero point of the yaw rate sensor.
(1) Keep the vehicle in a stationary condition on a level surface for 1 second or more.
(b) Check the output of the yaw rate sensor.

(1) Move the shift lever to the D position, drive the vehicle at a speed of approximately 3 mph (5 km/h), and turn the steering wheel either to the left or right 90° or more until the vehicle makes a 180° turn.
(2) Stop the vehicle and move the shift lever to the P position. Check that the skid control buzzer sounds for 3 seconds.
HINT:
- If the skid control buzzer sounds, the sensor check has been completed normally.
- If the skid control buzzer does not sound, check the 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 VSC 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.

8. SENSOR CHECK USING TEST MODE (for Using a SST Check Wire)
(a) When having replaced the skid control ECU 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 the ON position to the ACC or LOCK position during test mode (sensor check), DTCs recorded during the sensor check will be erased.
- During test mode (sensor check), the skid control ECU records all DTCs of the sensor check function. By performing the test mode (sensor check), the codes are erased if normality is confirmed. The remaining codes are the codes where an abnormality was found.

(b) Procedure to enter test mode
(1) Turn the ignition switch off.
(2) Check that the steering wheel is in the straight ahead position 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 OFF indicator lights blink (test mode).
HINT: If the ABS warning and VSC OFF indicator lights do not blink, inspect the TS and CG terminal circuit, ABS warning and/or VSC OFF indicator light circuit.

9. LOST BOOSTER PRESSURE JUDGEMENT CHECK AND MASTER CYLINDER PRESSURE SENSOR ZERO POINT CALIBRATION (for Using a SST Check Wire)
NOTICE:
Perform the check in the lost booster pressure state (negative pressure in the booster is depressurized).

(a) Turn the ignition switch to the ON position.
(b) Check that the brake warning light comes on when depressing the brake pedal with a force of 59 N (6 kgf, 13.2 lbf) or more for 1 second or more. (The lost booster pressure state is judged normal.)
(c) Start the engine depressing the brake pedal with a force of 59 N (6 kgf, 13.2 lbf) or more for 1 second or more.
(d) Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged normal.)
(e) Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)
NOTICE:
- If the brake pedal is slowly depressed or depressed again, master cylinder pressure sensor zero point calibration is not performed normally.
- If lost booster pressure judgement check is not completed normally, master cylinder pressure sensor check is not judged.
- If recheck is performed after the engine has started, end the test mode, transit to the test mode again, and release the vacuum in the booster by pumping the brake pedal prior to the recheck.

10. ACCELERATION SENSOR CHECK (for Using a 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 (for Using a SST Check Wire)
(a) Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second or more.
(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.

12. SPEED SENSOR CHECK (for Using a SST Check Wire)
(a) Check the speed sensor signal.
(1) Drive the vehicle straight-ahead. Drive the vehicle at a speed of 28 mph (45 km/h) or more for several seconds and check that the ABS warning light goes off.
HINT: The sensor check may not be completed if wheel spin occurs, or if the steering wheel is turned during this check.

(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 50 mph (80 km/h), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 50 mph (80 km/h).
- If the sensor 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.

13. YAW RATE SENSOR CHECK (for Using a SST Check Wire)
(a) Check the zero point of the yaw rate sensor.
(1) Keep the vehicle in a stationary condition on a level surface for 1 second or more.
(b) Check the output of the yaw rate sensor.

VSC sensor:

HINT: The codes in this table are output only in test mode (sensor check).