Test Mode Procedure [08/2019 - 08/2021]

NOTE:

After replacing the master cylinder solenoid and/or yaw rate and acceleration sensor (center airbag sensor assembly), perform calibration.
VSC is prohibited during test mode.

HINT:

By switching the skid control ECU (master cylinder solenoid) 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 engine switch is turned from on (IG) to on (ACC) or off during test mode, DTCs related to the signal check function are not cleared. During test mode, do not change to normal mode.
During test mode, the skid control ECU (master cylinder solenoid) stores all DTCs related to the signal check function, and the DTCs are cleared if normality is confirmed. Any remaining DTCs indicate abnormalities that were found.
w/ Pre-collision System:
When entering test mode, the skid control ECU (master cylinder solenoid) communicates with the driving support ECU assembly to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit test mode within 5 seconds of entering test mode.

TEST MODE (SIGNAL CHECK) PROCEDURE

Enter Test Mode (Signal Check)
1. Place the vehicle on a level surface with an inclination of less than 1%.
2. Turn the engine switch off.
3. Check that the shift lever is in P.
  WARNING:
  Apply the parking brake for safety.
4. Connect the Techstream to the DLC3.
5. Turn the engine switch on (IG).
6. Turn the Techstream on.
7. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check.
8. 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:
  
  Do not exit test mode within 5 seconds of entering test mode. If test mode is exited within 5 seconds of entering test mode, DTC U1104 may be stored. If DTC U1104 is output after exiting test mode, enter test mode again, wait at least 5 seconds, then recheck for DTCs.
9. Start the engine.
ABS Signal Check
HINT:

Check that the ABS warning light is blinking in the test mode blinking pattern (0.125 seconds on and 0.125 seconds off) before performing the ABS signal check.
Master Cylinder Pressure Sensor and Acceleration Sensor (Center Airbag Sensor Assembly) Check
1. Keep the vehicle stationary on a level surface for 1 second or more.
2. With the vehicle stationary, release the brake pedal for 1 second or more, and then quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second.
3. Check that the ABS warning light comes on for 3 seconds.
  HINT:
  
  During test mode, the ABS warning light turns on for 3 seconds every time the above operation is performed.
Center Differential Lock Detection Switch Check
1. Press the center differential lock switch to lock the center differential.
  HINT:
  
  Move the vehicle either forward or backward a little to engage the center differential lock.
2. Press the center differential lock switch to unlock the center differential.
Speed Sensor Check
NOTE:
- Before performing the speed sensor signal check, complete the master cylinder pressure sensor check.
- The signal check may not be completed if the wheels of the vehicle spin or the steering wheel is turned during this check.
1. Drive the vehicle straight forward at a speed of 45 km/h (28 mph) or more for several seconds (forward signal check).
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 (reverse signal check).
4. Check that the ABS warning light goes off.
  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.
  NOTE:
  - The sensor check may not be completed if wheelspin occurs.
  - The ABS warning light blinks when the sensor check is 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.
  NOTE:
  - 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 is not completed, the ABS warning light blinks while driving and the ABS does not operate.
  HINT:
  
  When the signal check is completed, the ABS warning light goes off while driving and blinks in the test mode pattern while stationary.
VSC Signal Check
HINT:

Check that the slip indicator light is blinking in the test mode blinking pattern (0.125 seconds on and 0.125 seconds off) before performing the VSC signal check.
Downhill Assist Control Switch Check (w/ Downhill Assist Control)
1. Push the downhill assist control switch and check that the downhill assist control indicator light is blinking.
2. Turn the downhill assist control switch off.

Crawl ON/OFF switch / Crawl speed selector switch Check (w/ Crawl Control)

Fig 1: Crawl On/Off Switch / Crawl Speed Selector Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Crawl ON/OFF switch / Crawl speed Selector Switch / Multi-terrain Select Mode Switch (Combination Switch Assembly)
*2	ON/OFF Switch
*3	Speed Selector Switch

Push the ON/OFF switch and check that the crawl indicator light is on while the switch is being pushed.
Turn the ON/OFF switch off.
Set the target vehicle speed to L (low) with the speed selector switch.
Set the target vehicle speed to medium-low with the speed selector switch.
Set the target vehicle speed to M (medium) with the speed selector switch.
Set the target vehicle speed to medium-high with the speed selector switch.
Set the target vehicle speed to H (high) with the speed selector switch.
Set the target vehicle speed to L (low) with the speed selector switch.
HINT:

The speed selector status is displayed on the multi-information display.

VSC OFF Switch Check
1. Press the VSC OFF switch.
2. Check that the VSC OFF indicator light comes on.
3. Press the VSC OFF switch again to turn the VSC OFF indicator light off.
End of Signal Check
1. If the signal check is completed, the ABS warning light and slip indicator light blink (0.125 seconds on and 0.125 seconds off) when the vehicle is stopped and goes off while driving the vehicle.
  NOTE:
  If the signal check is not completed, the ABS warning light blinks while driving and the ABS does not operate.
Read test mode (signal check) DTCs.
1. Read the DTC(s) by following the Techstream screen.
  NOTE:
  - If only DTCs other than test mode signal check DTCs are output, repair the malfunctions and clear the DTCs.
  - If test mode signal check DTCs and other DTCs are output or if only test mode sensor check DTCs are output, repair the malfunctions, clear the DTCs, and perform the test mode inspection again.
  HINT:
  
  Refer to Signal Check DTCs.
2. Turn the engine switch off and disconnect the Techstream.

LIST OF TEST MODE (SIGNAL CHECK) DTC

ABS

DTC Code	Detection Item	Trouble Area
C1271	Front Speed Sensor RH Output Voltage Malfunction	Front speed sensor RH Sensor installation Front speed sensor rotor RH
C1272	Front Speed Sensor LH Output Voltage Malfunction	Front speed sensor LH Sensor installation Front speed sensor rotor LH
C1273	Rear Speed Sensor RH Output Voltage Malfunction	Rear speed sensor RH Sensor installation Rear speed sensor rotor RH
C1274	Rear Speed Sensor LH Output Voltage Malfunction	Rear speed sensor LH Sensor installation Rear speed sensor rotor LH
C1275	Abnormal Change in Output Signal of Front Speed Sensor RH	Front speed sensor RH Front speed sensor rotor RH
C1276	Abnormal Change in Output Signal of Front Speed Sensor LH	Front speed sensor LH Front speed sensor rotor LH
C1277	Abnormal Change in Output Signal of Rear Speed Sensor RH	Rear speed sensor RH Rear speed sensor rotor RH
C1278	Abnormal Change in Output Signal of Rear Speed Sensor LH	Rear speed sensor LH Rear speed sensor rotor LH
C1279	G Sensor Output Voltage Malfunction	ECU-IG NO. 3 fuse Sensor installation Harness or connector Yaw rate and acceleration sensor (Center airbag sensor assembly) CAN communication system
C1281	Master Cylinder Pressure Sensor Output Malfunction	Master cylinder pressure sensor (Master cylinder solenoid)
C1282	Center Differential Lock Position Switch Malfunction	Harness or connector Transfer system Skid control ECU (Master cylinder solenoid)

VSC

DTC Code	Detection Item	Trouble Area
C1379	w/ Downhill Assist Control: Malfunction in downhill assist control switch w/ Crawl Control: Malfunction in crawl switch	Combination switch Harness or connector Skid control ECU (Master cylinder solenoid)