Inspection Procedure

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

INSPECT BRAKE ACTUATOR ASSEMBLY

Disconnect the brake actuator connector.

Measure the resistance of the actuator.

HINT:

Check the brake actuator when it is cooled down.

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
A2-20 (SMC1) - A2-7 (BS2)	14.6 to 24.6 Ω
A2-6 (SMC2) - A2-19(BS1)	14.6 to 24.6 Ω
A2-8 (FR+) - A2-5 (FR-)	3.5 to 4.3 Ω
A2-22 (FR+) - A2-21 (FR-)	3.5 to 4.3 Ω
A2-13 (FL+) - A2-14(FL-)	3.5 to 4.3 Ω
A2-27 (FL+) - A2-28 (FL-)	3.5 to 4.3 Ω
A2-12 (RR+) - A2-11 (RR-)	3.5 to 4.3 Ω
A2-10 (RL+) - A2-9(RL-)	3.5 to 4.3 Ω

Fig 1: Identifying Brake Actuator Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE BRAKE ACTUATOR ASSEMBLY

OK: Go to Next Step

CHECK SKID CONTROL ECU (VALVE VOLTAGE)

Fig 2: Exploded View Of Transfer Assembly Components (4 Of 8)

Measure the voltage of the ECU connector.

Standard voltage

STANDARD VOLTAGE CHART

Tester Connection	Condition	Specified Condition
S7-4 (SMC1) - Body ground	Power switch ON (READY) Brake pedal released	Below 10 to 14 V
S10-3 (SMC2) - Body ground	Power switch ON (READY) Brake pedal released	Below 10 to 14 V
S7-7 (SLAFR+) - Body ground	Power switch ON (READY) Brake pedal released	Pulse generation*
S7-6 (SLAFR-) - Body ground	Power switch ON (READY) Brake pedal released	Pulse generation*
S10-1 (SLAFL+) - Body ground	Power switch ON (READY) Brake pedal released	Pulse generation*
S10-2(SLAFL-) - Body ground	Power switch ON (READY) Brake pedal released	Pulse generation*
S10-19(SLARR+) - Body ground	Power switch ON (READY) Brake pedal released	Pulse generation*
S10-9(SLARR-) - Body ground	Power switch ON (READY) Brake pedal released	Pulse generation*
S7-15(SLARL+) - Body ground	Power switch ON (READY) Brake pedal released	Pulse generation*
S7-27 (SLARL-) - Body ground	Power switch ON (READY) Brake pedal released	Pulse generation*
S7-17(SLRFR+) - Body ground	Power switch ON (READY) Brake pedal released	Below 1.5 V
S10-8(SLRFL+) - Body ground	Power switch ON (READY) Brake pedal released	Below 1.5 V
S10-20 (SLRRR+) -Body ground	Power switch ON (READY) Brake pedal released	Below 1.5 V
S7-16(SLRRL+) - Body ground	Power switch ON (READY) Brake pedal released	Below 1.5 V
S7-34 (SLRFR-) - Body ground	Power switch ON (READY)	Below 1.5 V
S10-26(SLRFL-) - Body ground	Power switch ON (READY) Brake pedal released	Below 1.5 V
S10-18(SLRRR-) - Body ground	Power switch ON (READY) Brake pedal released	Below 1.5 V
S7-26 (SLRRL-) - Body ground	Power switch ON (READY) Brake pedal released	Below 1.5 V
HINT: *: Refer to waveform 5 of "TERMINALS OF ECU " .

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE SKID CONTROL ECU