Inspection Procedure

NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (see INITIALIZATION ).

HINT:

DTCs may be output if the accumulator pressure drops due to frequent braking (this is not a malfunction).

INSPECT BRAKE ACTUATOR ASSEMBLY

Disconnect the brake actuator connector.

Measure the resistance of the actuator.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
1 (BM2) - 31 (GND1)	Below 10 Ω
2 (BM1) - 31 (GND1)	Below 10 Ω
1 (BM2) - 2 (BM1)	Below 1 Ω
31 (GND1) - 32 (GND2)	Below 1 Ω
1 (BM2) - 33 (MTT)	Approx. 10 Ω
2 (BM1) - 33 (MTT)	Approx. 10 Ω

Fig 1: Inspecting Brake Actuator Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE BRAKE ACTUATOR ASSEMBLY

OK : GO TO NEXT STEP

READ VALUE OF INTELLIGENT TESTER (ACCUMULATOR PRESSURE SENSOR)

Check the DATA LIST for proper functioning of the accumulator pressure sensor.

Depress the brake pedal 4 or 5 times to operate the pump motor, and check the output value on the intelligent tester with the motor stopped (not braking).

Skid control ECU

DATA LIST

Item	Measurement Item / Range (Display)	Normal condition	Diagnostic Note
ACC PRESS SENS	1 Accumulator pressure sensor 1 / Min.: 0 V, Max.: 5 V	Specified value: 3.2 to 4.0 V	-

OK : Accumulator pressure sensor's output voltage does not drop.

NG : REPLACE BRAKE ACTUATOR ASSEMBLY

OK : REPLACE SKID CONTROL ECU