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

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
A2-1 (BM2) - A2-31 (GND1)	Below 10 Ω
A2-2(BM1) - A2-31 (GND1)	Below 10 Ω
A2-1 (BM2) - A2-2(BM1)	Below 1 Ω
A2-31 (GND1) - A2-32 (GND2)	Below 1 Ω
A2-1 (BM2) - A2-33 (MTT)	Approx. 10 Ω
A2-2(BM1) - A2-33(MTT)	Approx. 10 Ω

NG: REPLACE BRAKE ACTUATOR ASSEMBLY

Fig 1: Inspecting Brake Actuator Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

SKID CONTROL ECU DIAGNOSTIC CHART

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