Brake Override System [08/2017 - 08/2018]: Procedure

WARNING: This page is about a different car, the 2018 Toyota Sequoia, 2017 Toyota Sequoia, and 2016 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC OUTPUT

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the intelligent tester on.
Enter the following menus: System Select / Health Check.

Check DTCs.

RESULT

Result	Proceed to
No DTC output	A
DTC output	B

Result:

GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2017 - 08/2018]

Result:

See step 2

READ VALUE USING INTELLIGENT TESTER (MASTER CYLINDER SENSOR)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the intelligent tester on.
Start the engine.
Enter the following menus: Chassis / ABS/VSC/TRAC / Data List / Master Cylinder Sensor.

Read the value displayed on the intelligent tester.

Intelligent tester Display	Measurement Item/Range	Normal Condition
Master Cylinder Sensor	Master cylinder pressure sensor reading/ Min.: 0.00 V, Max.: 5.00 V	Brake pedal released: 0.30 to 0.90 V Reading increases when brake pedal is depressed

Check that the brake fluid pressure value of the "Master Cylinder Sensor" observed on the intelligent tester changes when the brake pedal is depressed.
OK

When the pedal is depressed, the voltage displayed on the intelligent tester increases.

Result:

INSPECT BRAKE ACTUATOR ASSEMBLY

Result:

See step 3

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH AND ST1)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the intelligent tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch and ST1.

Check the Data List indication when the brake pedal is depressed and released.

intelligent tester Display	Condition	Specified Condition
Stop Light Switch	Brake pedal released	OFF
Stop Light Switch	Brake pedal depressed	ON
ST1	Brake pedal released	OFF
ST1	Brake pedal depressed	ON

Result:

INSPECT STOP LIGHT SWITCH ASSEMBLY

(Refer to INSPECTION [08/2015 - ] )

Result:

See step 4

INSPECT BRAKE PEDAL
1. Inspect and adjust the brake pedal (Refer to ADJUSTMENT [08/2017 - ] ).
  HINT:
  
  If the stop light switch turns ON too late, the start of brake override system control may be delayed; if it turns ON too soon, brake override system control may begin too early, so conduct inspection of the brake pedal and stop light switch assembly.
Result:

NG

REPAIR OR REPLACE BRAKE PEDAL

(Refer to REMOVAL [08/2017 - ] )

Result:

OK

See step 5

READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the intelligent tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %.

Read the value displayed on the intelligent tester.

intelligent tester Display	Condition	Specified Condition
Accel Sens. No. 1 Volt %	Accelerator Pedal Released → Depressed → Released	Values smoothly change following accelerator pedal operation
Accel Sens. No. 2 Volt %	Accelerator Pedal Released → Depressed → Released

HINT:

For numerical values of Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %, refer to the Data List (Refer to DATA LIST / ACTIVE TEST [08/2017 - 08/2018] ).

Result:

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

(Refer to REMOVAL [08/2015 - 08/2018] )

Result:

See step 6

READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the intelligent tester on.
Start the engine.
Enter the following menus: Powertrain / Engine and ECT / Data List / Vehicle Speed.

Read the value displayed on the intelligent tester.

Standard

intelligent tester Display	Condition	Specified Condition
Vehicle Speed	Vehicle stopped, engine running	0 km/h (0 mph)
Vehicle Speed	Vehicle running at constant speed between 16.1 to 64.4 km/h (10 to 40 mph)	No large fluctuations when driving at a constant speed

WARNING:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

Result:

GO TO VEHICLE SPEED SENSOR "A"

(Refer to DTC P0500: Vehicle Speed Sensor "A" [08/2017 - 08/2018] )

Result:

See step 7

READ VALUE USING INTELLIGENT TESTER (FR, FL, RR, RL WHEEL SPEED)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the intelligent tester on.
Start the engine.
Enter the following menus: Chassis / ABS/VSC/TRAC / Data List / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.

Read the value displayed on the intelligent tester.

Standard

intelligent tester Display	Condition	Specified Condition
FR Wheel Speed FL Wheel Speed RR Wheel Speed RL Wheel Speed	Vehicle stopped, engine running	0 km/h (0 mph)
FR Wheel Speed FL Wheel Speed RR Wheel Speed RL Wheel Speed	Vehicle running at constant speed between 16.1 to 64.4 km/h (10 to 40 mph)	No large fluctuations when driving at a constant speed

WARNING:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

Result:

END

Result:

INSPECT FRONT OR REAR SPEED SENSOR