Up to 08/2009
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: TEST MODE PROCEDURE
1. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK
(a) Release the parking brake.
NOTICE:
When releasing the parking brake, move the shift lever to P for safety.
HINT
When the parking brake is applied or the brake fluid level is low, the brake warning light / red (malfunction) comes on.
(b) When the power switch is turned on (IG), check that the VSC OFF indicator light comes on for approximately 3 seconds, and ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights remain on until the power switch is turned on (READY).
HINT
* 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.
2. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using the Techstream)
NOTICE:
Before performing the master cylinder pressure sensor check or yaw rate sensor zero point voltage check, perform linear valve offset learning.
HINT
* 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.
(a) Procedure to enter the Test Mode
(1) Turn the power switch off.
(2) Check that the steering wheel is centered.
(3) Check that the shift lever is in P.
(4) Connect the Techstream to the DLC3.
(5) Turn the power switch on (IG).
(6) Turn the Techstream on.
(7) Switch the skid control ECU to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check.
(8) 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.
HINT
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.
(9) Check the ABS sensors.
HINT
Check that the ABS warning light is blinking in the Test Mode blinking pattern before performing the ABS sensor check.
(b) Acceleration Sensor Check
(1) Keep the vehicle stationary on a level surface for 2 seconds or more.
HINT
The acceleration sensor check can be performed with the master cylinder pressure sensor check below.
(c) Master Cylinder Pressure Sensor Check
NOTICE:
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 lbf) for 1 second.
(2) Check that the ABS warning light stays on for 3 seconds.
HINT
* 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 lbf) or more.
* The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
(d) Speed Sensor Check
NOTICE:
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.
HINT
* The sensor check may not be completed if wheel spin occurs.
* The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
(2) Stop the vehicle.
NOTICE:
* 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.
HINT
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.
(e) Yaw Rate Sensor Zero Point Voltage Check
NOTICE:
Before performing the yaw rate sensor zero point voltage check, perform linear valve offset learning.
(1) Keep the vehicle stationary on a level surface for 4 seconds or more.
(f) Yaw Rate Sensor Output Check
(1) Move the shift lever from P to D 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.
NOTICE:
* 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 allow the wheels to spin.
* Do not turn the power switch off while turning.
* Do not move the shift lever to P while turning, but changing the vehicle speed, stopping, or driving in reverse is acceptable.
(2) Stop the vehicle and move the shift lever to P. Check that the skid control buzzer sounds for 3 seconds.
HINT
* If the skid control buzzer sounds, the sensor check has completed normally.
* If the skid control buzzer does not sound, check the skid control buzzer circuit Skid Control Buzzer Circuit, then perform the sensor check again.
* If the skid control buzzer still does not sound, the yaw rate sensor may be malfunctioning. Check for DTCs.
(g) 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 driving.
NOTICE:
* When all the yaw rate and 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.
(h) Read Sensor Check DTCs
(1) Read the DTC(s) by following the Techstream screen.
NOTICE:
* 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.
HINT
See "Sensor Check DTCs".
(2) Turn the power switch off and disconnect the Techstream.
(i) Sensor Check DTCs
ABS Sensor
VSC Sensor
Electronically Controlled Brake System Sensor
HINT
The codes in this table are output only in Test Mode (signal check).
3. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When not Using the Techstream)
NOTICE:
Before performing the master cylinder pressure sensor check or yaw rate sensor zero point voltage check, perform linear valve offset learning.
HINT
* 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.
(a) Procedure to enter Test Mode
(1) Turn the power switch off.
(2) Check that the steering wheel is centered.
(3) Check that the shift lever is in P.
(4) Using SST, connect terminals TS and CG of the DLC3.
SST : 09843-18040
Text in Illustration
(5) Turn the power switch on (IG).
(6) 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.
HINT
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.
(7) Check the ABS sensors.
HINT
Check that the ABS warning light is blinking in the Test Mode blinking pattern before performing the ABS sensor check.
(b) Acceleration Sensor Check
(1) Keep the vehicle stationary on a level surface for 2 seconds or more.
HINT
The acceleration sensor check can be performed with the master cylinder pressure sensor check below.
(c) Master Cylinder Pressure Sensor Check
NOTICE:
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 lbf) for 1 second.
(2) Check that the ABS warning light stays on for 3 seconds.
HINT
* 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 lbf) or more.
* The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
(d) Speed Sensor Check
NOTICE:
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.
HINT
* The sensor check may not be completed if wheel spin occurs.
* The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
(2) Stop the vehicle.
NOTICE:
* 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.
HINT
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.
(e) Yaw Rate Sensor Zero Point Voltage Check
NOTICE:
Before performing the yaw rate sensor zero point voltage check, perform linear valve offset learning.
(1) Keep the vehicle stationary on a level surface for 4 seconds or more.
(f) Yaw Rate Sensor Output Check
(1) Move the shift lever from P to D 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.
NOTICE:
* 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 allow the wheels to spin.
* Do not turn the power switch off while turning.
* Do not move the shift lever to P while turning, but changing the vehicle speed, stopping, or driving in reverse is acceptable.
(2) Stop the vehicle and move the shift lever to P. Check that the skid control buzzer sounds for 3 seconds.
HINT
* If the skid control buzzer sounds, the sensor check has completed normally.
* If the skid control buzzer does not sound, check the skid control buzzer circuit Skid Control Buzzer Circuit, then perform the sensor check again.
* If the skid control buzzer still does not sound, the yaw rate sensor may be malfunctioning. Check for DTCs.
(g) 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 driving.
NOTICE:
* 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.
(h) Read Sensor Check DTCs
(1) Using SST, connect terminals TC and CG of the DLC3.
SST : 09843-18040
Text in Illustration
(2) Count the number of blinks of the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights.
NOTICE:
* 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.
HINT
* 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.
(4) Turn the power switch on (IG).
HINT
* 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.
(i) Sensor Check DTCs
ABS Sensor
VSC Sensor
Electronically Controlled Brake System Sensor
HINT
The codes in this table are output only in Test Mode (signal check).