Test Mode Procedure
BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: TEST MODE PROCEDURE
1. WARNING LIGHT AND INDICATOR LIGHT CHECK
(a) Release the parking brake.
CAUTION:
When releasing the parking brake, set chocks to hold the vehicle for safety.
(b) When the engine switch is on (IG), check that the ABS warning light, brake warning light / red (malfunction), brake warning light / yellow (minor malfunction), and slip, VSC OFF, brake hold standby and brake hold operated indicator lights illuminate and then turn off after the engine starts.
If the result is not as specified, proceed to troubleshooting for the light circuit below.
2. SENSOR SIGNAL CHECK BY TEST MODE (SIGNAL CHECK) (WHEN USING TECHSTREAM)
HINT
* 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.
* 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 erased.
* 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 erased if normality is confirmed. The remaining codes are the codes where an abnormality was found.
(a) Procedure for Test Mode.
(1) Turn the engine switch off.
(2) Connect the Techstream to the DLC3.
(3) Check that the steering wheel is centered and move the shift lever to the P position.
(4) Start the engine.
(5) Set the Techstream to Test Mode (select "Signal Check").
HINT
Refer to the Techstream operator's manual for further details.
(6) Check that the ABS warning light, slip indicator light and brake warning light / yellow (minor malfunction) blink.
HINT
If the ABS warning light, slip indicator light and brake warning light / yellow (minor malfunction) do not blink, inspect the TS and CG terminal circuit, ABS warning light circuit, slip indicator light circuit and/or brake warning light / yellow (minor malfunction) circuit.
3. ACCELERATION SENSOR CHECK (WHEN USING TECHSTREAM)
(a) Make sure that the ABS warning light is blinking in Test Mode before performing the check.
(b) Keep the vehicle stationary on a level surface for 1 second or more.
HINT
The acceleration sensor check can be performed with the following master cylinder pressure sensor check.
4. MASTER CYLINDER PRESSURE SENSOR CHECK (WHEN USING 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.
5. SPEED SENSOR CHECK (WHEN USING TECHSTREAM)
(a) Check the forward signal.
(1) Drive the vehicle straight ahead.
Drive the vehicle at a speed of 45 km/h (28 mph) or more for several seconds.
HINT
The signal check may not be completed if the vehicle has its wheels spun.
(b) Check the backward signal.
(1) Drive the vehicle in reverse for more than 1 second at the speed of 3 km/h (2 mph) or more and check that the ABS warning light goes off.
HINT
Drive the vehicle in reverse and check the speed sensor signal. The signal check cannot be completed if the vehicle speed is 45 km/h (28 mph) or more.
(c) Stop the vehicle.
NOTICE:
* 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.
* 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 the Test Mode pattern while the vehicle is stationary.
6. YAW RATE SENSOR CHECK (WHEN USING TECHSTREAM)
(a) Perform the check after checking that the slip indicator light and brake warning light / yellow (minor malfunction) blink.
(b) Check the zero point voltage of the yaw rate sensor.
(1) Keep the vehicle stationary on a level surface for 1 second or more.
HINT
When changing to test mode, if a part or wire harness is malfunctioning, the ABS warning light and brake warning light / yellow (minor malfunction) remain illuminated.
(c) Check the output of the yaw rate sensor and the direction of the steering angle sensor.
(1) Move the shift lever from the P to the D position and drive the vehicle, 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.
If the skid control buzzer sounds, the signal check is completed normally.
If the skid control buzzer does not sound, check the skid control buzzer circuit, then perform the signal check again. If the skid control buzzer still does not sound, there may be a malfunction in the yaw rate sensor, so check the DTC.
HINT
* At the end of the 180° turn, the direction of the vehicle should be within 175 to 185° 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.
7. YAW RATE SENSOR DISCRIMINATION
(a) Enter test mode and wait for 4 second or more.
HINT
* This check cannot be performed when the yaw rate sensor has a communication malfunction.
* The yaw rate sensor must be normal and must not have a communication malfunction. If so, and if the procedure above is performed, the check is complete.
NOTICE:
If the yaw rate sensor has a discrimination malfunction, perform the yaw rate sensor and G sensor zero point calibration.
8. END OF SENSOR CHECK (WHEN USING TECHSTREAM)
(a) If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle stops, and the ABS warning light goes off when the vehicle is driving.
NOTICE:
* When the yaw rate sensor, acceleration sensor, speed sensor and master cylinder pressure sensor checks are finished, all the sensor checks are completed.
* If all sensor checks are not completed, the ABS warning light blinks even while the vehicle is driving and the ABS does not operate.
9. READ DTC OF SIGNAL CHECK FUNCTION (WHEN USING TECHSTREAM)
(a) Read the DTC(s) by following the tester prompt.
NOTICE:
* If only DTCs are displayed, repair the malfunction area and clear the DTCs.
* If only Test Mode codes (DTC of signal check function) are displayed, repair the malfunction area, clear the Test Mode codes and perform the Test Mode inspection.
* If DTCs and Test Mode codes (DTCs of the signal check function) are displayed, repair the malfunction, clear the DTCs and Test Mode codes and perform the Test Mode inspection.
HINT
See the list of DTCs Electronically Controlled Brake System.
10. DTC OF TEST MODE FUNCTION (SIGNAL CHECK) (WHEN USING TECHSTREAM)
ABS sensor:
VSC sensor:
Electronically controlled brake system sensor:
HINT
* The codes in this table are output only in Test Mode (signal check).
* If test mode DTC C1346/71 is not cleared, adjust the brake pedal stroke sensor Installation.
11. SENSOR SIGNAL CHECK BY TEST MODE (SIGNAL CHECK) (WHEN USING SST CHECK WIRE)
HINT
* 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.
* 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 erased.
* 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 erased if normality is confirmed. The remaining codes are the codes where an abnormality was found.
(a) Procedure for Test Mode.
(1) Turn the engine switch off.
(2) Check that the steering wheel is in the centered position and move the shift lever to the P position.
(3) Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.
SST : 09843-18040
(4) Start the engine.
(5) Check that the ABS warning light, slip indicator light and brake warning light / yellow (minor malfunction) blink.
HINT
If the ABS warning light, slip indicator light and brake warning light / yellow (minor malfunction) do not blink, inspect the TS and CG terminal circuit, ABS warning light circuit, slip indicator light circuit and/or brake warning light / yellow (minor malfunction) circuit.
12. ACCELERATION SENSOR CHECK (WHEN USING SST CHECK WIRE)
(a) Make sure that the ABS warning light is blinking in Test Mode before performing the check.
(b) Keep the vehicle stationary on a level surface for 1 second or more.
HINT
The acceleration sensor check can be performed with the following master cylinder pressure sensor check.
13. MASTER CYLINDER PRESSURE SENSOR CHECK (WHEN USING 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.
14. SPEED SENSOR CHECK (WHEN USING SST CHECK WIRE)
(a) Check the forward signal.
(1) Drive the vehicle straight ahead.
Drive the vehicle at a speed of 45 km/h (28 mph) or more for several seconds.
HINT
The signal check may not be completed if the vehicle has its wheels spun.
(b) Check the backward signal.
(1) Drive the vehicle in reverse for more than 1 second at a speed of 3 km/h (2 mph) or more and check that the ABS warning light goes off.
HINT
Drive the vehicle in reverse and check the speed sensor signal. The signal check cannot be completed if the vehicle speed is 45 km/h (28 mph) or more.
(c) Stop the vehicle.
NOTICE:
* 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.
* 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 the Test Mode pattern while the vehicle is stationary.
15. YAW RATE SENSOR CHECK (WHEN USING SST CHECK WIRE)
(a) Perform the check after checking that the slip indicator light and brake warning light / yellow (minor malfunction) blink.
(b) Check the zero point voltage of the yaw rate sensor.
(1) Keep the vehicle stationary on a level surface for 1 second or more.
HINT
When changing to test mode, if a part or wire harness is malfunctioning, the ABS warning light and brake warning light / yellow (minor malfunction) remain illuminated.
(c) Check the output of the yaw rate sensor and the direction of the steering angle sensor.
(1) Move the shift lever from the P to the D position and drive the vehicle, 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.
If the skid control buzzer sounds, the signal check is completed normally.
If the skid control buzzer does not sound, check the skid control buzzer circuit, then perform the signal check again. If the skid control buzzer still does not sound, there way be a malfunction in the yaw rate sensor, so check the DTC.
HINT
* At the end of the 180° turn, the direction of the vehicle should be within 175 to 185° 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.
16. END OF SENSOR CHECK (WHEN USING 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 goes off when the vehicle is driving.
NOTICE:
* When the yaw rate sensor, acceleration sensor, speed sensor and master cylinder pressure sensor checks are completed, the sensor checks are completed.
* If all sensor checks are not finished, the ABS warning light blinks even while the vehicle is driving and the ABS does not operate.
17. READ DTC OF SIGNAL CHECK FUNCTION (WHEN USING SST CHECK WIRE)
(a) Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.
SST : 09843-18040
(b) Count the number of blinks of the ABS warning light, brake warning light / yellow (minor malfunction), slip indicator light and brake hold standby indicator light.
NOTICE:
* If only DTCs are displayed, repair the malfunction area and clear the DTCs.
* If only Test Mode codes (DTC of signal check function) are displayed, repair the malfunction area, clear the Test Mode codes and perform the Test Mode inspection.
* If DTCs and Test Mode codes (DTCs of the signal check function) are displayed, repair the malfunction, clear the DTCs and Test Mode codes and perform the Test Mode inspection.
HINT
* When the system is normal, the relevant light turns on for 0.25 seconds and off for 0.25 seconds and repeats this pattern.
* When only 1 DTC is stored, the relevant light outputs the same code after an interval of 4 seconds. Example: When DTC 71 is stored, the light blinks 7 times, turns off for 1.5 seconds, blinks once, turns off for 4 seconds, and then repeats this output pattern.
* When 2 or more DTCs are stored, the relevant light outputs the codes with an interval of 2.5 seconds between each different code, and the output of all codes repeats after an interval of 4 seconds.
* If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.
* See the list of DTCs Electronically Controlled Brake System.
(c) Turn the engine switch off. Then disconnect SST from terminals 12 (TS), 4 (CG) and 13 (TC) of the DLC3.
(d) Turn the engine switch on (IG).
HINT
If the engine switch is not turned on (IG) after SST is removed from the DLC3, the previous Test Mode will continue.
18. DTC OF TEST MODE FUNCTION (SIGNAL CHECK) (WHEN USING SST CHECK WIRE)
ABS sensor:
VSC sensor:
Electronically controlled brake system sensor:
HINT
* The codes in this table are output only in Test Mode (signal check).
* If test mode DTC C1346/71 is not cleared, adjust the brake pedal stroke sensor Installation.