Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When replacing the VSC actuator assembly, perform zero point calibration (See CALIBRATION ).

READ VALUE USING TECHSTREAM (STROKE SENSOR)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Run the engine until the engine reaches 3,000 rpm, and return it back to idle.
HINT:

Rev up the engine to ensure a sufficient vacuum.

Select the Data List mode on the Techstream.

ABS/VSC/TRAC

DIAGNOSTIC NOTE TABLE

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Stroke Sensor	Pedal stroke sensor / min.: 0.2 V, max.: 4.7 V	Approximately 1.9 V without the brake pedal depressed.	-

HINT:

The result appears on the Techstream after some delay because a time lag occurs when using the Techstream.
If a signal from the pedal stroke sensor is sent between sampling, the result does not appear on the Techstream. So be sure to perform the measurement 2 or 3 times.

Check that the brake pedal acceleration value of the delta S sensor displayed on the Techstream changes by alternately depressing and releasing the brake pedal.
OK: The value changes as shown below.

(The value will return to approximately 1.9 V after the brake pedal is released.)

HINT:
- The maximum voltage depends on pedal stroke speed but should not exceed 4.7 V or fall below 0.2 V.
- Even if the result is as described above, a malfunction may still exist because there is a high possibility that the malfunction simulation will fail. Therefore, proceed to the troubleshooting procedures below.
  
  Fig 1: Identifying Voltage Graph
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK HARNESS AND CONNECTOR (PEDAL STROKE SENSOR - SKID CONTROL ECU)

Confirm that the skid control ECU connector and pedal stroke sensor connector are properly connected.
Disconnect the A17 ECU connector.
Disconnect the A19 sensor connector.
Inspect both the connector case and the terminal for deformation and corrosion.
OK: No deformation or corrosion.

Measure the resistance according to the value (s) in the table below.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Condition	Specified Condition
A17-18 (PIM) - A19-5 (PIM)	Always	Below 1 Ω
A17-18 (PIM) - Body ground	Always	10 kΩ or higher
A17-21 (E3) - A19-3 (E3)	Always	Below 1 Ω
A17-21 (E3) - Body ground	Always	10 kΩ or higher
A17-22 (VCP) - A19-1 (VCP)	Always	Below 1 Ω
A17-22 (VCP) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying A17 Skid Control ECU Connector & A19 Pedal Stroke Sensor Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go To Next Step

INSPECT BRAKE BOOSTER ASSEMBLY (PEDAL STROKE SENSOR)

Disconnect the A19 sensor connector.

Measure the voltage according to the value (s) in the table below.

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Switch Condition	Specified Condition
A19-1 (VCP) - Body ground	Ignition switch ON	5.0 V

Fig 3: Identifying A19 Sensor Connector Terminals

NG: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

OK: REPLACE BRAKE BOOSTER ASSEMBLY (See REMOVAL )