Test Mode Procedure

HINT:

• After replacing the yaw rate and deceleration sensor, be sure to clear the zero point calibration data in the skid control ECU and perform zero point calibration.
• If the ignition switch is turned from ON to ACC or LOCK position during test mode, DTCs related to the signal check function will be erased.
• During test mode, the skid control ECU records all DTCs related to the signal check function. By performing the signal check, the codes are erased if normality is confirmed. The codes left over are the codes where an abnormality was found.

1. Turn the ignition switch off.
2. Check that the steering wheel is in the straight-ahead position.
3. A/T: Check that the shift lever is in the P position and apply the parking brake.

   M/T: Check that the shift lever is in neutral and apply the parking brake.

4. Connect the Techstream to the DLC3.
5. Start the engine.
6. Switch the ECU to test mode using the Techstream. Select the following menu items: Chassis / ABS/ VSC/TRAC / Signal Check
7. Check that the ABS and VSC TRAC warning lights blink as shown in the illustration.

   HINT:

   If the ABS warning light and VSC TRAC warning light do not blink, inspect the ABS warning light circuit and VSC TRAC warning light circuit.

   Fig 1: ABS And VSC TRAC Warning Lights Blinking Pattern In Test Mode

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TROUBLE AREA REFERENCE
   
   

   Trouble area	See
   ABS warning light circuit	ABS WARNING LIGHT REMAINS ON  ABS WARNING LIGHT DOES NOT COME ON
   VSC TRAC warning light circuit	VSC TRAC WARNING LIGHT REMAINS ON  VSC TRAC WARNING LIGHT DOES NOT COME ON

8. Activate the ABS sensors (deceleration sensor, master cylinder pressure sensor, 4WD detection switch, L4 detection switch and speed sensor) and VSC sensor (yaw rate and deceleration sensor) in test mode (SIGNAL CHECK) using a Techstream.

HINT:

• After replacing the yaw rate and deceleration sensor, be sure to clear the zero point calibration data in the skid control ECU and perform zero point calibration.
• If the ignition switch is turned from ON to ACC or LOCK position during test mode, DTCs relating to the signal check function will be erased.
• During test mode, the skid control ECU records all DTCs relating to the signal check function. By performing the signal check, the codes are erased if normality is confirmed. The remaining codes are those indicating where an abnormality was found.

1. Turn the ignition switch off.
2. Check that the steering wheel is in the straight-ahead position.
3. A/T: Check that the shift lever is in the P position and apply the parking brake.

   M/T: Check that the shift lever is in neutral and apply the parking brake.

4. Using SST, connect terminals TS and CG of the DLC3.

   SST 09843-18040 

   Fig 2: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Start the engine.
6. Check that the ABS and VSC TRAC warning lights blink as shown in the illustration.

   HINT:

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

   Fig 3: ABS And VSC TRAC Warning Lights Blinking Pattern In Test Mode

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TROUBLE AREA REFERENCE
   
   

   Trouble area	See
   ABS warning light circuit	ABS WARNING LIGHT REMAINS ON  ABS WARNING LIGHT DOES NOT COME ON
   VSC TRAC warning light circuit	VSC TRAC WARNING LIGHT REMAINS ON  VSC TRAC WARNING LIGHT DOES NOT COME ON
   TS and CG terminal circuit	TS AND CG TERMINAL CIRCUIT

7. Activate the ABS sensors (deceleration sensor, master cylinder pressure sensor, 4WD detection switch, L4 detection switch and speed sensor) and VSC sensor (yaw rate and deceleration sensor) in test mode (SIGNAL CHECK) using a check wire.

1. Keep the vehicle stationary on a level surface for 1 second or more.

   HINT:

   The ABS warning light continues blinking at this time.

1. Keep the vehicle stationary and release the brake pedal for 1 second or more, and quickly depress the brake pedal with a force of 98 N (10 kgf) or more for 1 second or more.
2. Check that the ABS warning light comes on for 3 seconds.

   HINT:

   • While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf) or more.
   • The ABS warning light comes on for 3 seconds every time the above brake pedal operation is performed.

1. M/T:
   1. Move the transfer high and low shift lever to HL or HH to lock the center differential.
   2. Move the transfer high and low shift lever to H to unlock the center differential.
2. A/T:
   1. Move the transfer high and low shift lever to H4 or L4 to put the vehicle in 4WD mode.
   2. Move the transfer high and low shift lever to H2 to put the vehicle in 2WD mode.

1. Move the transfer high and low shift lever to the L4 position.
2. Move the transfer high and low shift lever to H2 or H4.

   HINT:

   Move the vehicle either a little forward or a little backward to engage the L4 position.

1. Drive the vehicle straight rearward at a speed of 1.9 mph (3 km/h) or more for 1 second or more.
   NOTE: At this time, if the vehicle speed exceeds 28 mph (45 km/h), a signal check code will be stored again. Decelerate or stop the vehicle before the speed reaches 28 mph (45 km/h).
2. Drive the vehicle straight forward at a speed of 56 mph (90 km/h) or more.
3. Check that the ABS warning light goes off.
   NOTE:

   • Before performing the speed sensor signal check, complete the deceleration sensor, master cylinder pressure sensor, 4WD detection switch and L4 detection switch signal checks.
   • 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.
   • After the ABS warning light goes off, if the vehicle speed exceeds 28 mph (45 km/h), a signal check code will be stored again. Decelerate or stop the vehicle before the speed reaches 28 mph (45 km/h).
   • If the signal check has not been completed, the ABS warning light blinks while driving and the ABS system does not operate.