Test Mode Procedure
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: 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 the brake fluid is low, the BRAKE warning light comes on.
(b) When the engine switch is turned on (IG), check that the ABS warning, BRAKE warning, VSC OFF indicator, SLIP indicator, and master warning lights all come on for approximately 3 seconds.
HINT
* If the skid control ECU stores any DTCs, the ABS warning, BRAKE warning and SLIP indicator lights will come on.
* If any of 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)
NOTICE:
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 engine switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs of the signal check function will be cleared.
* 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 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 engine 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 engine switch on (IG).
(5) Set Techstream to Test Mode (select "Signal Check").
HINT
Refer to Techstream operator's manual for further details.
(6) Check that the ABS warning and SLIP indicator lights come on for several seconds and then blink in the Test Mode blinking pattern.
HINT
* 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.
* The TRAC OFF message is displayed on the multi information display during Test Mode because TRAC and VSC are prohibited.
(7) Check the ABS sensor.
HINT
Check that the ABS warning light is blinking in Test Mode blinking pattern before performing the ABS sensor 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 wheel spin 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.
HINT
Check that the SLIP indicator light is blinking in the Test Mode pattern 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 meter buzzer (for sensor check) sounds for 3 seconds.
HINT
* If the meter buzzer (for sensor check) sounds, the sensor check is completed normally.
* If the meter buzzer (for sensor check) does not sound, check the VSC buzzer circuit VSC Buzzer Circuit, then perform the sensor check again.
* If the meter buzzer (for sensor check) 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 engine 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.
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 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)
NOTICE:
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 engine switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs of the signal check function will be cleared.
* 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 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 engine 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
Text in Illustration
(4) Turn the engine switch on (IG).
(5) Check that the ABS warning and SLIP indicator lights come on for several seconds and then blink in the Test Mode blinking pattern.
HINT
* 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.
* The TRAC OFF message is displayed on the multi information display during Test Mode because TRAC and VSC are prohibited.
(6) Check that the ABS sensor.
HINT
Check that the ABS warning light is blinking in Test Mode blinking pattern before performing the ABS sensor 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 wheel spin 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.
HINT
Check that the SLIP indicator light is blinking in the Test Mode pattern 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 meter buzzer (for sensor check) sounds for 3 seconds.
HINT
* If the meter buzzer (for sensor check) sounds, the sensor check is completed normally.
* If the meter buzzer (for sensor check) does not sound, check the VSC buzzer circuit VSC Buzzer Circuit, then perform the sensor check again.
* If the meter buzzer (for sensor check) 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 engine 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) 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 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.
15. READ DTC OF SIGNAL CHECK FUNCTION (SST CHECK WIRE)
(a) Using SST, connect terminals TC and CG of the DLC3.
SST : 09843-18040
Text in Illustration
(b) Count the number of blinks of the ABS warning and SLIP indicator lights.
HINT
* How to read DTCs:
* Diagnostic trouble codes are represented by the number of blinks of a warning light. For example, code 21 would be shown by 2 blinks, a pause of 1.5 seconds, and then 1 blink.
* If one code is detected:
* The light repeats the same code after a pause of 4 seconds.
* If multiple codes are detected:
* The light outputs one code after another with a 2.5-second pause between each code. When all codes have been output, there is a 4-second pause and then the light beings to output the codes again.
NOTICE:
* If only DTCs other than the 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 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 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 engine switch off.
(d) Turn the engine switch on (IG).
HINT
* If the engine switch is not turned on (IG) after the SST is removed from the DLC3, the previous Test Mode will continue.
* If the engine switch is turned on (IG) 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).