Test Mode Procedure
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for ADVICS Made): TEST MODE PROCEDURE
1. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK
(a) Release parking brake.
NOTICE:
Before releasing parking brake, move the shift lever to P for safety.
HINT
When 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 on (IG), check that the ABS warning, BRAKE warning, TRAC OFF indicator, VSC OFF indicator and SLIP indicator lights 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 indicators remain on or do 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:
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 (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 Test Mode (signal check), the codes are cleared if a normal condition is confirmed. The remaining codes are the codes where a malfunction was found.
(a) 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 P.
(4) Connect the Techstream to the DLC3.
(5) Turn the ignition switch on (IG).
(6) Turn the Techstream on.
(7) Set the Techstream to Test Mode (select "Signal Check").
HINT
Refer to the Techstream operator's manual for further details.
(8) Check that the ABS warning and SLIP indicator lights come on for several seconds and then blink in Test Mode.
HINT
* The TRAC OFF indicator light remains on during Test Mode because TRAC is prohibited.
* 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.
(9) Check the ABS sensor.
HINT
Check that the ABS warning light is blinking in Test Mode pattern before performing the ABS sensor check.
3. ACCELERATION SENSOR CHECK (When Using the Techstream)
(a) Keep the vehicle stationary on a level surface for 1 second or more.
HINT
The acceleration sensor check can be performed with the master cylinder pressure sensor check below.
4. MASTER CYLINDER PRESSURE SENSOR CHECK (When Using the 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, 22.0 lbf) or more for 1 second.
(b) 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 is illuminated, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 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 (When Using the Techstream)
(a) Check the speed sensor signal.
(1) Drive the vehicle straight ahead.
Accelerate the vehicle to 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 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 50 mph (80 km/h), a signal check code will be stored again. Accelerate or stop the vehicle before the speed reaches 50 mph (80 km/h).
* 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 Test Mode pattern while stationary.
(c) Check the VSC sensor.
HINT
Check that the SLIP indicator light is blinking in Test Mode pattern before performing the VSC sensor check.
6. YAW RATE SENSOR CHECK (When Using the Techstream)
(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 D and 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.
(3) Stop the vehicle and move the shift lever to P. 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 ignition switch off while turning.
* Do not move the shift lever to P 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 (When Using the 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 has not been completed, the ABS warning light blinks while driving and the ABS does not operate.
8. READ SENSOR CHECK DTCS (When Using the Techstream)
(a) Read the DTC(s) by following the Techstream 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 malfunctions, clear the DTCs and perform Test Mode inspection again.
HINT
See DTCS OF TEST MODE (SIGNAL CHECK) FUNCTION (Procedure "A").
9. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When not Using the 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 ignition 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 Test Mode (signal check), the codes are cleared if a normal condition is confirmed. The remaining codes are the codes where a malfunction was found.
(a) Procedure to enter Test Mode.
(1) Turn the ignition 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
(5) Turn the ignition switch on (IG).
(6) Check that the ABS warning and SLIP indicator lights come on for several seconds and then blink in Test Mode.
HINT
* The TRAC OFF indicator light remains on during Test Mode because TRAC is prohibited.
* 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.
(7) Check the ABS sensor.
HINT
Check that the ABS warning light is blinking in Test Mode pattern before performing the ABS sensor check.
10. ACCELERATION SENSOR CHECK (When not Using the Techstream)
(a) Keep the vehicle stationary on a level surface for 1 second or more.
HINT
The acceleration sensor check can be performed with the master cylinder pressure sensor check below.
11. MASTER CYLINDER PRESSURE SENSOR CHECK (When not Using the 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, 22.0 lbf) or more for 1 second.
(b) 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 is illuminated, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 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 (When not Using the Techstream)
(a) Check the speed sensor signal.
(1) Drive the vehicle straight ahead.
Accelerate the vehicle to 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 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 50 mph (80 km/h), a signal check code will be stored again. Accelerate or stop the vehicle before the speed reaches 50 mph (80 km/h).
* 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 Test Mode pattern while stationary.
(c) Check the VSC sensor.
HINT
Check that the SLIP indicator light is blinking in Test Mode pattern before performing VSC sensor check.
13. YAW RATE SENSOR CHECK (When not Using the Techstream)
(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 D and 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.
(3) Stop the vehicle and move the shift lever to P. 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 ignition switch off while turning.
* Do not move the shift lever to P 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 (When not Using the 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 has not been completed, the ABS warning light blinks while driving and the ABS does not operate.
15. READ SENSOR CHECK DTCS (When not Using the Techstream)
(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 SLIP indicator lights and/or read a diagnosis VSC message displayed on the multi-information display (models with multi-information display).
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 begins to output the codes again.
NOTICE:
* If only DTCs other than 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 Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform 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 DTCS OF TEST MODE (SIGNAL CHECK) FUNCTION (Procedure "A").
(c) After performing the check, disconnect SST from terminals TS and CG, and TC and CG of the DLC3 and turn the ignition switch off.
(d) Turn the ignition switch on (IG).
HINT
* If the ignition switch is not turned on (IG) after SST is removed from the DLC3, the previous Test Mode will continue.
* If the ignition switch is turned on (IG) with terminals TS and CG connected, the previous Test Mode will continue.
16. DTCS 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).