Inspection Procedure

1. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

OK 

NG : INSPECT STOP LIGHT CIRCUIT  (See STOP LIGHT SWITCH CIRCUIT )

OK : Go to Next Step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Select the Data List mode on the Techstream (See DATA LIST / ACTIVE TEST ).

   ABS/VSC/TRAC: 

   ABS/VSC/TRAC REFERENCE CHART
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch / ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-
   Brake Pedal Load Sensing SW	Brake pedal load sensing switch / ON or OFF	ON: Brake pedal depressed beyond the specified point OFF: Brake pedal not depressed beyond the specified point	-

4. Check that the stop light switch display and brake pedal load sensing switch display observed on the Techstream change according to brake pedal operation.

   OK: The Techstream displays ON or OFF according to brake pedal operation. 

5. Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch turn ON.

OK: First the stop light switch should turn ON, and then the brake pedal load sensing switch should turn ON. 

Result 

B : Go to step  5

C : Go to step  6

D : Go to step  7

A : Go to Next Step 

1. Select the Data List mode on the Techstream (See DATA LIST / ACTIVE TEST ).

   ABS/VSC/TRAC: 

   ABS/VSC/TRAC REFERENCE CHART
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Master Cylinder Sensor	Master cylinder pressure sensor 1 reading / min.: 0 V, max.: 5 V	When brake pedal released: 0.3 to 0.9 V	Reading increases when the brake pedal depressed.

2. Check that the brake fluid pressure value of the master cylinder pressure sensor observed on the Techstream changes when the brake pedal is depressed.

OK: When the pedal is depressed, voltage displayed on the Techstream increases. 

NG : REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL )

OK : Go to Next Step 

1. Turn the ignition switch off.
2. Perform the sensor check in the Test Mode procedure (See TEST MODE PROCEDURE ).

OK: All Test Mode DTCs are cleared. 

NG : REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL )

OK : CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)  (See HOW TO PROCEED WITH TROUBLESHOOTING )

1. Turn the ignition switch off.
2. Make sure that there is no looseness in the locking part and connecting part of the connector.
3. Disconnect the skid control ECU connector.
4. Measure the voltage according to the value(s) in the table below.

Standard Voltage 

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

Fig 1: Identifying A19 Skid Control ECU Connector Terminals (STP)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL )

1. Turn the ignition switch off.
2. Make sure that there is no looseness in the locking part and connecting part of the connector.
3. Disconnect the skid control ECU connector.
4. Measure the resistance according to the value(s) in the table below.

Standard Resistance 

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (FSW+ CIRCUIT) 

Fig 2: Identifying A19 Skid Control ECU Connector Terminals (FEW+)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL )

1. Turn the ignition switch off.
2. Check the brake pedal height and stop light switch installation (See INSPECTION ).

OK: The brake pedal height and stop light switch installation are normal. 

NG : ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH  (See INSPECTION )

OK : REPLACE BRAKE PEDAL SUPPORT ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH)  (See REMOVAL )