Inspection Procedure

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

READ VALUE OF INTELLIGENT TESTER (MASTER CYLINDER PRESSURE SENSOR)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position and push the intelligent tester main switch ON.

Select "DATA LIST" mode on the intelligent tester.

DATA LIST

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
MAS CYL PRS 1	Master cylinder pressure sensor 1 reading / min.: 0 V, max.: 5 V	When brake pedal is released: 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 intelligent tester changes when depressing the brake pedal.

Result

RESULT TABLE

Condition	Proceed to
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

A: REPLACE MASTER CYLINDER SOLENOID

C: Go to step 4

B: Go to Next Step

INSPECT SKID CONTROL ECU (STP TERMINAL)

Fig 1: Identifying Skid Control ECU Connector S37

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Condition	Specified Condition
S37-7 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
S37-7 (STP) - Body ground	Stop light switch OFF (Brake pedal released	Below 1.5 V

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

OK: Go to Next Step

RECONFIRM DTC

Clear the DTC (See DTC CHECK/CLEAR ).
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 TABLE

Condition	Proceed to
DTC is output	A
DTC is not output	B

B: END

A: REPLACE MASTER CYLINDER SOLENOID