Test Mode Procedure

HINT:

By switching the skid control ECU from normal mode to test mode, abnormality detection sensitivity is enhanced and troubleshooting can be conducted efficiently.
Perform a sensor check in test mode after the speed sensor or sensor rotor has been repaired or replaced.
If the ignition switch is turned from ON to ACC or OFF during test mode, DTCs related to the signal check function will be erased.
During test mode, the skid control ECU stores all DTCs related to the signal check function, and the DTCs are erased if normality is confirmed. Any remaining DTCs are those indicating abnormalities that were found.

CHECK SENSOR SIGNAL BY TEST MODE (When Using Intelligent Tester)

Procedures for test mode:

Turn the ignition switch OFF.
Check that the steering wheel is in the centered position.
Check that the shift lever is in the P position and apply the parking brake.
Connect the intelligent tester (with CAN VIM) to the DLC3.

Fig 1: Connecting Intelligent Tester To DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the ignition switch ON.
Turn the tester on.
Set the intelligent tester to Test Mode (select "Signal Check").

Fig 2: Displaying Diagnostic Menu
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Refer to intelligent tester operator's manual for further details.

Check that the ABS warning light and VSC warning light blink as shown in Fig 3.

HINT:

If the ABS warning light and VSC warning light do not blink, check the TS and CG terminal circuit, and ABS and VSC warning light circuits.

Fig 3: Identifying Blinking Pattern (Test Mode)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SECTION TITLE REFERENCE

Section Title	Refer to procedure
ABS Warning Light does not Come ON	ABS WARNING LIGHT REMAINS ON
VSC Warning Light does not Come ON	VSC WARNING LIGHT REMAINS ON
TS and CG Terminal Circuit	TS AND CG TERMINAL CIRCUIT

Start the engine.

w/16-inch disc only:
Check the lost booster pressure judgment and perform the master cylinder pressure sensor zero point calibration.

NOTE: Preform the check in the lost booster pressure state (negative pressure in the booster is depressurized).
1. Turn the ignition switch ON.
2. Check that the brake warning light comes on when depressing the brake pedal with a force of 59 N (6 kgf, 13.2 lbf) or more for 1 second or more. (The lost booster pressure state is judged normal.)
3. Start the engine depressing the brake pedal with a force of 59 N (6 kgf, 13.2 lbf) or more for 1 second or more.
4. Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged normal.)
5. Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration.)
  NOTE:
  - If you slowly depress the brake pedal or depress it again, master cylinder pressure sensor zero point calibration is not performed normally.
  - If the lost booster pressure judgment check is not completed normally, the master cylinder pressure sensor check is not judged.
  - If a recheck is performed after the engine has started, end the Test Mode, enter Test Mode again, and release the vacuum in the booster by pumping the brake pedal prior to the recheck.
Check the deceleration sensor.
1. Keep the vehicle stationary on a level surface for 1 second or more.
  HINT:
  
  The deceleration sensor check can be performed together with the following master cylinder pressure sensor check.
Check the master cylinder pressure sensor.
1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second. Check that the ABS warning light remains illuminated for 3 seconds.
  HINT:
  - Ensure that the ABS warning light comes on.
  - While the ABS warning light remains illuminated, continue depressing 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.
Check the speed sensor.
1. Check that the ABS warning light is blinking as shown in Fig 4.
  
  Fig 4: Identifying ABS Warning Light Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. 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.
    NOTE:
    The speed sensor check may not be completed if the sensor check is started with the steering wheel turned or one or more wheels spinning.
    
    If the speed sensor check is commenced while the steering wheel is turned, the ABS warning light may come on after the low speed check is finished.
    
    The ABS warning light comes on immediately when an abnormality is detected.
    
    When the speed sensor signal is normal, the ABS warning light goes off while driving at 45 km/h (28 mph) or more, and blinks in the test mode pattern while the vehicle is stationary.
    
    Do not drive the vehicle at a speed of 80 km/h (50 mph) or more after the ABS warning light turns off, because test mode DTCs are set again when the vehicle speed exceeds 80 km/h (50 mph).
    
    Fig 5: Blinking Pattern Speed Sensor Graph
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Stop the vehicle.
Check the yaw rate sensor.
1. Move the shift lever to P and set the parking brake lever.
2. Check that the VSC warning light is blinking as shown in Fig 6.
3. Keep the vehicle stationary on a level surface for 1 second or more.
  
  Fig 6: Identifying Blinking Pattern (Test Mode)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Shift the shift lever 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 to turn the vehicle through 180°. (See Fig 7).
5. Stop the vehicle, move the shift lever into the P position, and then apply the parking brake.
6. Check that the skid control buzzer sounds for 3 seconds.
  
  Fig 7: Checking Skid Control Warning Buzzer (Yaw Rate Sensor)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  - If the skid control buzzer sounds, the signal check has been completed normally.
  - If the skid control buzzer does not sound, check the skid control buzzer circuit (see SKID CONTROL BUZZER CIRCUIT ).
  - If the skid control buzzer still does not sound, there is a malfunction in the yaw rate sensor, so check for DTCs.
  - Drive the vehicle in a 180° semi circle. At the end of the turn, the direction of the vehicle should be within 180 +-5° of its start position.
  - Complete the vehicle turn within 20 seconds.
  - Do not spin the wheels.
w/Downhill assist control only:
Check the downhill assist control operation switch.
1. Check that the VSC warning light is blinking as shown in Fig 8.
2. Check the downhill assist control switch.
  1. Push the downhill assist control switch on.
  2. Push the downhill assist control switch off.
w/Auto LSD only:
1. Check that the AUTO LSD light illuminates only when the AUTO LSD switch is pressed.
  
  Fig 8: Identifying Blinking Pattern (Test Mode)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check the end of sensor.
1. When the sensor check is successfully completed, the ABS warning light blinks in the test mode pattern when the vehicle is stopped, and goes off when the vehicle is driven.
  NOTE: If the sensor check is not completed, the ABS warning light blinks even while the vehicle is driving and the ABS does not operate.
Read the DTCs of signal check function.
1. Read the DTC(s) by following the instructions on the tester screen.
  NOTE:
  - 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 the DTCs (refer to DTC OF TEST MODE FUNCTION (SIGNAL CHECK) .

CHECK SENSOR SIGNAL BY TEST MODE (When not Using Intelligent Tester)

Procedures for test mode:

Turn the ignition switch OFF.
Check that the steering wheel is in the centered position.
Check that the shift lever is in the P position and apply the parking brake.
Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.
SST 09843-18040
Turn the ignition switch ON.

Fig 9: Identifying DLC3 Connect Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check that the ABS warning light and VSC warning light blink as shown in Fig 10.

HINT:

If the ABS warning light and VSC warning light and multi information display and master caution indicator light do not blink, check the TS and CG terminal circuit, and ABS and VSC warning light circuits.

Fig 10: Identifying Blinking Pattern (Test Mode)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SECTION TITLE REFERENCE

Section Title	Refer to procedure
ABS Warning Light does not Come ON	ABS WARNING LIGHT REMAINS ON
VSC Warning Light does not Come ON	VSC WARNING LIGHT REMAINS ON
TS and CG Terminal Circuit	TS AND CG TERMINAL CIRCUIT

Start the engine.

w/16-inch disc:
Check the lost booster pressure judgment and perform the master cylinder pressure sensor zero point calibration.

NOTE: Preform the check in the lost booster pressure state (negative pressure in the booster is depressurized).
1. Turn the ignition switch ON.
2. Check that the BRAKE warning light comes on when depressing the brake pedal with a force of 59 N (6 kgf, 13.2 lbf) or more for 1 second or more. (The lost booster pressure state is judged normal.)
3. Start the engine depressing the brake pedal with a force of 59 N (6 kgf, 13.2 lbf) or more for 1 second or more.
4. Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged normal.)
5. Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration.)
  NOTE:
  - If you slowly depress the brake pedal or depress it again, master cylinder pressure sensor zero point calibration is not performed normally.
  - If the lost booster pressure judgment check is not completed normally, the master cylinder pressure sensor check is not judged.
  - If a recheck is performed after the engine has started, end the Test Mode, enter Test Mode again, and release the vacuum in the booster by pumping the brake pedal prior to the recheck.
Check the deceleration sensor.
1. Keep the vehicle stationary on a level surface for 1 second or more.
  HINT:
  
  The deceleration sensor check can be performed together with the following master cylinder pressure sensor check.
Check the master cylinder pressure sensor.
1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second. Check that the ABS warning light remains illuminated for 3 seconds.
  HINT:
  - Ensure that the ABS warning light comes on.
  - While the ABS warning light remains illuminated, continue depressing 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.
Check the speed sensor.
1. Check that the ABS warning light is blinking as shown in Fig 11.
2. 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.
    
    Fig 11: Identifying ABS Warning Light Blinking Pattern
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Check that the ABS warning light goes off.
    NOTE:
    The speed sensor check may not be completed if the sensor check is started with the steering wheel turned or one or more wheels spinning.
    
    If the speed sensor check is commenced while the steering wheel is turned, the ABS warning light may come on after the low speed check is finished.
    
    The ABS warning light comes on immediately when an abnormality is detected.
    
    When the speed sensor signal is normal, the ABS warning light goes off while driving at 45 km/h (28 mph) or more, and blinks in the test mode pattern while the vehicle is stationary.
    
    Do not drive the vehicle at a speed of 80 km/h (50 mph) or more after the ABS warning light turns off, because test mode DTCs are set again when the vehicle speed exceeds 80 km/h (50 mph).
    
    Fig 12: Identifying Speed Sensor Graph
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Stop the vehicle.
Check the Yaw Rate sensor.
1. Move the shift lever to P and set the parking brake lever.
2. Check that the VSC warning light is blinking as shown in Fig 13.
3. Keep the vehicle stationary on a level surface for 1 second or more.
  
  Fig 13: Identifying Blinking Pattern (Test Mode)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Shift the shift lever 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 to turn the vehicle through 180°.
5. Stop the vehicle, move the shift lever into the P position, and then apply the parking brake.
6. Check that the skid control buzzer sounds for 3 seconds.
  
  Fig 14: Checking Skid Control Warning Buzzer (Yaw Rate Sensor)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  - If the skid control buzzer sounds, the signal check has been completed normally.
  - If the skid control buzzer does not sound, check the skid control buzzer circuit (see SKID CONTROL BUZZER CIRCUIT ).
  - If the skid control buzzer still does not sound, there is a malfunction in the yaw rate sensor, so check for DTCs.
  - Drive the vehicle in a 180° semi circle. At the end of the turn, the direction of the vehicle should be within 180 +-5° of its start position.
  - Complete the vehicle turn within 20 seconds.
  - Do not spin the wheels.
w/Downhill assist control only:
Check the downhill assist control operation switch.
1. Check that the VSC warning light is blinking as shown in Fig 15.
2. Check the downhill assist control switch.
  1. Push the downhill assist control switch on.
  2. Push the downhill assist control switch off.
    
    Fig 15: Identifying Blinking Pattern (Test Mode)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
w/Auto LSD only:
Check the end of the sensor.
1. When the sensor check is successfully completed, the ABS warning light blinks in the test mode pattern when the vehicle is stopped, and goes off when the vehicle is driven.
  NOTE: If the sensor check is not completed, the ABS warning light blinks even while the vehicle is driving and the ABS does not operate.
Read the DTCs of the signal check function.
1. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.
  
  Fig 16: Identifying DLC3 Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  SST 09843-18040
2. Turn the ignition switch ON.
3. Count the number of blinks of the ABS and VSC warning light.
  HINT:
  
  As an example, the blinking patters of DTCs 71 and 74 are shown below.
  
  Fig 17: Identifying Blinking Pattern (Sample)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - If only DTCs are displayed, repair the malfunctioning area and clear the DTCs.
  - If the DTCs or test mode codes (DTC of signal check function) are displayed, repair the malfunctioning area, clear the DTCs and perform the test mode inspection.)
  HINT:
  - If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.
  - See the list of the DTCs (refer to DTC OF TEST MODE FUNCTION (SIGNAL CHECK) .
  - If all sensors are normal, a normal system code is output (the light comes on for 0.25 seconds at intervals of 0.25 seconds).
4. After the check, disconnect SST from terminals 13 (TC) and 4 (CG) of the DLC3.
5. Turn the ignition switch OFF.

DTC OF TEST MODE FUNCTION (SIGNAL CHECK)

DTC of ABS sensor check function:

DTC OF TEST MODE FUNCTION (SIGNAL CHECK)

DTC No.	Diagnosis	Trouble Areas
C1271/71	Low output signal of front speed sensor RH	Front speed sensor RH Speed sensor circuit Sensor installation
C1272/72	Low output signal of front speed sensor LH	Front speed sensor LH Speed sensor circuit Sensor installation
C1273/73	Low output signal of rear speed sensor RH	Rear speed sensor RH (for 4WD) Skid control sensor RH (for 2WD) Speed sensor circuit Sensor installation
C1274/74	Low output signal of rear speed sensor LH	Rear speed sensor LH (4WD) Skid control sensor LH (2WD) Speed sensor circuit Sensor installation
C1275/75	Abnormal change in output signal of front speed sensor RH	Sensor installation Speed sensor rotor Foreign matter on sensor tip or sensor rotor
C1276/76	Abnormal change in output signal of front speed sensor LH	Sensor installation Speed sensor rotor Foreign matter on sensor tip or sensor rotor
C1277/77	Abnormal change in output signal of rear speed sensor RH	Sensor installation Speed sensor rotor Foreign matter on sensor tip or sensor rotor
C1278/78	Abnormal change in output signal of rear speed sensor LH	Sensor installation Speed sensor rotor Foreign matter on sensor tip or sensor rotor
C1279/79	Deceleration sensor output voltage malfunction	Yaw rate sensor Sensor installation
C1281/81	Master cylinder pressure sensor output malfunction	Master cylinder pressure sensor Brake pedal load sensing switch (w/16-inch disc)

DTC of VSC sensor check function:

DTC CHART

DTC No.	Diagnosis	Trouble Areas
C0371/71	Yaw rate sensor	Yaw rate sensor
C1379/74*	Downhill assist control operation switch	Downhill assist control switch

HINT:

*: w/Downhill assist control
The DTCs in this table are only output in Test Mode.
The detection of DTCs from C1271/71 to C1274/74 is completed before the vehicle speed reaches 5 km/h (3 mph).
The detection of DTCs from C1275/75 to C1278/78 is completed before the vehicle speed reaches 45 km/h (28 mph).
C1271/71 to C1274/74: The speed output from only one wheel is extremely low despite other wheel speed outputs reaching 5 km/h (3 mph).
C1275/75 to C1278/78: The abnormal speed sensor output frequency is as shown in Fig 18.

Fig 18: Identifying Blinking Pattern (Example)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002