Test Mode Procedure
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster): TEST MODE PROCEDURE
1. TEST MODE PROCEDURE (for Using Techstream)
HINT
* If the ignition switch is turned from the ON to the ACC or LOCK position during test mode, DTCs related to the signal check function will be cleared.
* During test mode, the skid control ECU (brake actuator assembly) records all DTCs related to the signal check function. By performing the signal check, the codes are cleared if normality is confirmed. The codes left over are the codes where an abnormality was found.
(a) Turn the ignition switch to off.
(b) Check that the steering wheel is in the straight-ahead position.
(c) Automatic transmission: Check that the shift lever in P and apply the parking brake.
Manual transmission: Check that the shift lever is in neutral and apply the parking brake.
(d) Connect Techstream to the DLC3.
(e) Turn the ignition switch to ON.
(f) Switch the ECU to test mode using Techstream. Enter the following menu items: Chassis / ABS/VSC/TRAC / Utility / Signal Check.
(g) Check that the ABS warning light and slip indicator light blink at 0.125 second intervals (0.125 seconds on and 0.125 seconds off).
HINT
If the ABS warning light and slip indicator light do not blink, inspect the TS and CG terminal circuit, the ABS warning light circuit and slip indicator light circuit.
(h) Start the engine.
(i) Activate the ABS sensor (deceleration sensor, master cylinder pressure sensor, 4WD detection switch, L4 detection switch and speed sensor) and VSC sensor (VSC OFF switch) in test mode (Signal Check) using Techstream.
2. TEST MODE PROCEDURE (for Using SST Check Wire)
HINT
* After replacing the yaw rate and deceleration sensor, be sure to clear the zero point calibration data in the skid control ECU (brake actuator assembly) and perform zero point calibration.
* If the ignition switch is turned from the ON to the ACC or LOCK position during test mode, DTCs relating to the signal check function will be cleared.
* During test mode, the skid control ECU (brake actuator assembly) records all DTCs relating to the signal check function. By performing the signal check, the codes are cleared if normality is confirmed. The remaining codes are those indicating where an abnormality was found.
(a) Turn the ignition switch to off.
(b) Check that the steering wheel is in the straight-ahead position.
(c) Automatic transmission: Check that the shift lever in P and apply the parking brake.
Manual transmission: Check that the shift lever is in neutral and apply the parking brake.
(d) Using SST, connect terminals TS and CG of the DLC3.
SST : 09843-18040
Text in Illustration
(e) Turn the ignition switch to ON.
(f) Check that the ABS warning light and slip indicator light blink at 0.125 second intervals (0.125 seconds on and 0.125 seconds off).
HINT
If the ABS warning light and slip indicator light do not blink, inspect the TS and CG terminal circuit, the ABS warning light circuit and slip indicator light circuit.
(g) Start the engine.
(h) Activate the ABS sensor (deceleration sensor, master cylinder pressure sensor, 4WD detection switch, L4 detection switch and speed sensor) and VSC sensor (VSC OFF switch) in test mode (Signal Check) using a check wire.
3. DECELERATION SENSOR SIGNAL CHECK
(a) Keep the vehicle stationary on a level surface for 1 second or more.
HINT
Deceleration sensor check can be performed with the master cylinder pressure sensor check below.
4. MASTER CYLINDER PRESSURE SENSOR CHECK
(a) Keep the vehicle stationary and release the brake pedal for 1 second or more, and quickly depress the brake pedal with a force of 98 N (10 kgf) or more for 1 second or more.
* Keep the vehicle stationary and release the brake pedal for 1 second or more, and quickly depress the brake pedal with a force of 98 N (10 kgf) or more for 1 second or more.
* While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf) or more.
* The ABS warning light comes on for 3 seconds every time the above brake pedal operation is performed.
5. 4WD DETECTION SWITCH SIGNAL CHECK (for 4WD)
(a) Check the 4WD detection switch (4WD position).
(1) Push and turn the 4 wheel drive control switch to put the vehicle in 4WD mode.
(2) Push and turn the 4 wheel drive control switch to put the vehicle in 2WD mode.
6. L4 DETECTION SWITCH SIGNAL CHECK (for 4WD)
(a) Check the L4 detection switch (No. 2 transfer indicator switch).
(1) Turn the 4 wheel drive control switch to the L position to put the vehicle in L4 mode.
(2) Turn the 4 wheel drive control switch to the H position to put the vehicle in H4 mode.
HINT
Move the vehicle either a little forward or a little backward to engage the L4 position.
7. SPEED SENSOR CHECK
(a) Check the speed sensor signal
(1) Drive the vehicle straight forward at a speed of 45 km/h (28 mph) or more for several seconds.
(2) Check that the ABS warning light goes off.
(3) Drive the vehicle in reverse for more than 1 second at 3 km/h (2 mph) or more.
HINT
Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check cannot be completed if the vehicle speed is 45 km/h (28 mph) or more.
(4) Check that the ABS warning light goes off.
HINT
* 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 after a malfunction has been detected during the speed sensor check.
(5) Stop the vehicle.
NOTICE:
* Before performing the speed sensor signal check, complete the deceleration sensor, master cylinder pressure sensor, 4WD detection switch and L4 detection switch signal checks.
* The speed sensor signal check may not be completed if the speed sensor signal check is started while turning the steering wheel or spinning the wheels.
* After the ABS warning light goes off, if the vehicle speed exceeds 45 km/h (28 mph), a signal check code will be stored again. Decelerate or stop the vehicle before the speed reaches 45 km/h (28 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 signal check has been completed, the ABS warning light goes off while driving and blinks in test mode while stationary.
8. END OF ABS SENSOR CHECK
(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.
NOTICE:
* When the yaw rate and 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 driving and the ABS does not operate.
9. READ DTC OF ABS SENSOR (for Using Techstream)
(a) Read the DTC(s) by following the Techstream screen.
HINT
Refer to Techstream operator's manual for further details.
10. READ DTC OF ABS SENSOR (for Using SST Check Wire)
(a) Using SST, connect terminals TC and CG of the DLC3.
SST : 09843-18040
(b) Turn the ignition switch to ON.
(c) Read the number of blinks of the ABS warning light.
HINT
* When the system is operating correctly, each light will blink continuously in a pattern of 0.25 seconds on, then 0.25 seconds off.
* When one DTC is output, each light will output the same code at 4 second intervals. (For example, Code 21 would be output as 2 flashes, a 1.5 second pause, and then 1 flash)
* When 2 or more DTCs are output, each light will output a different code at 2.5 second intervals, and when all codes have been output, there will be a 4 second pause and the sequence will repeat.
* When multiple codes are set, they are output in order starting with the lowest DTC number.
(d) After the check, disconnect the SST from terminals TC and CG of the DLC3.
(e) Turn the ignition switch to off.
11. VSC OFF SWITCH CHECK
(a) Press the VSC OFF switch.
(b) Check that the AUTO LSD indicator light and VSC OFF indicator light come on.
(c) Press the VSC OFF switch again to turn the AUTO LSD indicator and VSC OFF indicator light off.
12. END OF VSC SENSOR CHECK
(a) If the sensor check is completed, the slip indicator light blinks (Test Mode).
NOTICE:
If the sensor check is not completed, the slip indicator light blinks even while the vehicle is driving and the VSC and traction control function do not operate.
(b) Turn the ignition switch to off.
13. DTC OF SIGNAL CHECK FUNCTION
ABS Sensor
HINT
The codes in this table are output only in test mode (signal check).