Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When replacing the master cylinder solenoid, perform zero point calibration (see CALIBRATION ).

HINT:

Start the inspection from step 1 when using the hand-held tester and start from step 2 when not using the hand-held tester.

READ VALUE OF HAND-HELD TESTER (MASTER CYLINDER PRESSURE SENSOR)

Connect the hand-held tester to the DLC3.
Turn the ignition switch to the ON position and push the hand-held tester main switch ON.

Select "DATA LIST" mode on the hand-held tester.

ITEMS NORMAL CONDITION TABLE

Item	Measurement Item/Range (Display)	Normal Condition	Diagnostic Note
MAS CYL PRESS 1	Master cylinder pressure sensor 1 reading/min.: 0 V, max.: 5 V	When brake pedal is released: 0.3 to 0.9 V When stop light is turned on: 0.3 to 0.9 V	Reading increases when brake pedal is depressed

Check that the master cylinder pressure value of the master cylinder pressure sensor displayed on the hand-held tester changes when depressing the brake pedal.

Result:

RESULT REFERENCE

Master cylinder pressure sensor value does not change	A
Master cylinder pressure sensor value changes but it is not normal	B
Master cylinder pressure sensor value becomes normal	C

B: Go to step 2

C: Go to step 4

A: Go to next step

REPLACE MASTER CYLINDER SOLENOID (See OVERHAUL )

CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION (See BRAKE PEDAL SUB-ASSY )
1. Check the brake pedal height.
2. Check the stop light switch installation.
  OK: The brake pedal and stop light switch are normal.
NG: ADJUST BRAKE PEDAL AND/OR STOP LIGHT SWITCH (See BRAKE PEDAL SUB-ASSY )

OK: Go to next step

INSPECT SKID CONTROL ECU (STP TERMINAL VOLTAGE)

Disconnect the skid control ECU connector.

Measure the voltage according to the value(s) in TERMINALS VOLTAGE SPECIFICATION TABLE .

Standard:

TERMINALS VOLTAGE SPECIFICATION TABLE

Tester Connection	Condition	Specified Condition
S28-7 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
S28-7 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

Fig 1: Identifying Skid Control ECU Connector Terminals

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

OK: Go to next step

RECONFIRM DTC
1. Clear the DTC (See DTC CHECK/CLEAR ).
2. Check if the same DTC is detected (See DTC CHECK/CLEAR ).
HINT:

Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result:
RESULT REFERENCE

DTC is output A

DTC is not output B

B: END

A: Go to next step

REPLACE MASTER CYLINDER SOLENOID (See OVERHAUL )

DTC is output	A
DTC is not output	B