Anti-Lock Brake System (For Hatchback) Test Mode Procedure

Release the parking brake.

NOTICE:

Before releasing the parking brake, move the shift lever to P or set chocks to prevent the vehicle from rolling.

HINT:

When the parking brake is applied or the brake fluid level is low, the brake warning light comes on.

When the ignition switch is turned to ON, check that the ABS warning and brake warning lights come on for approximately 3 seconds.

HINT:

1. If the skid control ECU (brake actuator assembly) stores any DTCs, the ABS warning and brake warning lights will come on.
   
2. If any of the indicators remain on or do not come on, proceed to troubleshooting for the light circuits listed below.
   

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 neutral and apply the parking brake.
   

4. Connect the Techstream to the DLC3.
   

5. Turn the ignition switch to ON.
   

6. Turn the Techstream on.
   

7. Switch the skid control ECU (brake actuator assembly) to Test Mode using the Techstream.
   Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check.
   

8. Check that the ABS warning light come on for several seconds and then blink in the Test Mode blinking pattern.
   

   HINT:

   If the ABS warning do not blink, inspect the TS and CG terminal circuit and ABS warning circuits.

   Trouble Area	See Procedure
   TS and CG terminal circuit	YARIS_NCP93 RM000000XIU0EQX.html
   ABS warning light circuit (Remains on)	YARIS_NCP93 RM000000XIH0CAX.html
   ABS warning light circuit (Does not come on)	YARIS_NCP93 RM000000XIQ0C7X.html

Check the speed sensor signal.

1. Drive the vehicle straight-ahead.
   Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds and check that the ABS warning light goes off.
   

   1. The sensor check may not be completed if wheelspin occurs.
      
   2. The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed.
      
   3. The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.
      

Stop the vehicle.

NOTICE:

1. 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.
   
2. After the ABS warning light goes off and if the vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
   
3. If the sensor check has not been completed, the ABS warning light blinks during driving and the ABS system does not operate.
   

HINT:

When the sensor check has been completed, the ABS warning light remains off during driving and blinks in the Test Mode pattern while the vehicle is stationary.

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 being driven.

NOTICE:

If the sensor check is not completed, the ABS warning light blinks even while the vehicle is being driven and the ABS does not operate.

Read the DTC(s) by following the tester screen.

NOTICE:

1. If only the DTCs are displayed, repair the malfunction area and clear the DTCs.
   
2. 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 the Test Mode inspection again.
   

List of DTCs.

HINT:

The codes in this table are output only in Test Mode (signal check).

Turn the ignition switch off and disconnect the Techstream.

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 neutral and apply the parking brake.
   





4. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.
   

   Text in Illustration

   *a	Front view of DLC3

   SST

   09843-18040
   

5. Turn the ignition switch to ON.
   

6. Check that the ABS warning light come on for several seconds and then blink in Test Mode.
   

   HINT:

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

   Trouble Area	See Procedure
   TS and CG terminal circuit	YARIS_NCP93 RM000000XIU0EQX.html
   ABS warning light circuit (Remains on)	YARIS_NCP93 RM000000XIH0CAX.html
   ABS warning light circuit (Does not come on)	YARIS_NCP93 RM000000XIQ0C7X.html

Check the speed sensor signal.

1. Drive the vehicle straight-ahead.
   Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds and check that the ABS warning light goes off.
   

   1. The sensor check may not be completed if wheelspin occurs.
      
   2. The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed.
      
   3. The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.
      

Stop the vehicle.

NOTICE:

1. 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.
   
2. After the ABS warning light goes off and if the vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
   
3. If the sensor check has not been completed, the ABS warning light blinks during driving and the ABS system does not operate.
   

HINT:

When the sensor check has been completed, the ABS warning light remains on during driving and blinks in the Test Mode pattern while the vehicle is stationary.

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 being driven.

NOTICE:

If the sensor check is not completed, the ABS warning light will blink even while the vehicle is driven and the ABS will not operate.

Using SST, connect terminals 12 (TS), 13 (TC) and 4 (CG) of the DLC3.

SST

09843-18040

Count the number of blinks of the ABS warning light.

NOTICE:

1. If only DTCs other than Test Mode sensor check DTCs are displayed, repair the malfunctions and clear the DTCs.
   
2. 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 the Test Mode inspection again.
   

HINT:

1. When the system is operating correctly, each light will blink continuously in a pattern of 0.25 seconds on, and then 0.25 seconds off.
   
2. When one DTC is output, each light will output the same code at 4 second intervals (for example, code 21 would be output as 2 flashes, a 1.5 second pause, and then 1 flash).
   
3. When 2 or more DTCs are output, each light will output a different code at 2.5 second intervals, and when all codes have been output, there will be a 4 second pause and the sequence will repeat.
   
4. When multiple codes are stored, they are output in order starting with the lowest DTC number
   

After performing the check, disconnect SST from terminals TS and CG, and TC and CG of the DLC3 and turn the ignition switch off.

Turn the ignition switch to ON.

HINT:

1. If the ignition switch is not turned to ON after SST is removed from the DLC3, the previous Test Mode will continue.
   
2. If the ignition switch is turned to ON with terminals TS and CG shorted, the previous Test Mode will continue.