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 according to the value(s) in the table below.
HINT:

Check the brake actuator assembly when it is cooled down.

Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
37 (SMC1) - 36 (BS1)	15.3 to 17.3 Ω
19 (SMC2) - 20 (BS2)	15.3 to 17.3 Ω
44 (SLAFR+) - 43 (SLAFR-)	3.6 to 4.2 Ω
28 (SLRFR+) - 27 (SLRFR-)	3.6 to 4.2 Ω
35 (SLAFL+) - 38 (SLAFL-)	3.6 to 4.2 Ω
21 (SLRFL+) - 22 (SLRFL-)	3.6 to 4.2 Ω
41 (SLARL+) - 42 (SLARL-)	3.6 to 4.2 Ω
25 (SLRRL+) - 26 (SLRRL-)	4.4 to 5.0 Ω
39 (SLARR+) - 40 (SLARR-)	3.6 to 4.2 Ω
23 (SLRRR+) - 24 (SLRRR-)	4.4 to 5.0 Ω

Fig 1: Identifying Brake Actuator Assembly Connector Terminal

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE BRAKE ACTUATOR ASSEMBLY

OK: Go to next step

CHECK HARNESS AND CONNECTOR (BETWEEN BRAKE ACTUATOR ASSEMBLY AND SKID CONTROL ECU)

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

Fig 2: Identifying Skid Control ECU Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
S38-4 (SMC1) - Body ground	Ignition switch ON Brake pedal released	10 to 14 V
S41-3 (SMC2) - Body ground	Ignition switch ON Brake pedal released	10 to 14 V
S38-7 (FRA+) - Body ground	Ignition switch ON Brake pedal released	Pulse generation (see d waveform 1) (See TERMINALS OF ECU )
S38-6 (FRA-) - Body ground	Ignition switch ON Brake pedal released	Pulse generation (see d waveform 1) (See TERMINALS OF ECU )
S41-1 (FLA+) - Body ground	Ignition switch ON Brake pedal released	Pulse generation (see d waveform 1) (See TERMINALS OF ECU )
S41-2 (FLA-) - Body ground	Ignition switch ON Brake pedal released	Pulse generation (see d waveform 1) (See TERMINALS OF ECU )
S41-19 (RRA+) - Body ground	Ignition switch ON Brake pedal released	Pulse generation (see d waveform 1) (See TERMINALS OF ECU )
S41-9 (RRA-) - Body ground	Ignition switch ON Brake pedal released	Pulse generation (see d waveform 1) (See TERMINALS OF ECU )
S38-15 (RLA+) - Body ground	Ignition switch ON Brake pedal released	Pulse generation (see d waveform 1) (See TERMINALS OF ECU )
S38-27 (RLA-) - Body ground	Ignition switch ON Brake pedal released	Pulse generation (see d waveform 1) (See TERMINALS OF ECU )
S38-17 (FRR+) - Body ground	Ignition switch ON Brake pedal released	Below 1.5 V
S41-8 (FLR+) - Body ground	Ignition switch ON Brake pedal released	Below 1.5 V
S41-20 (RRR+) - Body ground	Ignition switch ON Brake pedal released	Below 1.5 V
S38-16 (RLR+) - Body ground	Ignition switch ON Brake pedal released	Below 1.5 V
S38-34 (FRR-) - Body ground	Ignition switch ON Brake pedal released	Below 1.5 V
S41-26 (FLR-) - Body ground	Ignition switch ON Brake pedal released	Below 1.5 V
S41-18 (RRR-) - Body ground	Ignition switch ON Brake pedal released	Below 1.5 V
S38-26 (RLR-) - Body ground	Ignition switch ON Brake pedal released	Below 1.5 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE SKID CONTROL ECU