Inspection Procedure

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

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS NO.1 RELAY, ABS NO.2 RELAY)

Connect the intelligent tester to the DLC3.
Turn the ignition switch on.
Select the ACTIVE TEST mode on the intelligent tester.
Check the operation sound of the ABS No.1 and No.2 relays.

VEHICLE CONDITION DIAGNOSTIC CHART

Item

Vehicle Condition / Test Details

Diagnostic Note

ECB⁽¹⁾ RELAY

Turns ABS No.1 relay ON/OFF

Operating of solenoid (clicking sound) can be heard

ECB⁽¹⁾ RELAY 2

Turns ABS No.2 relay ON/OFF

Operating of solenoid (clicking sound) can be heard

⁽¹⁾	Electronically Controlled Brake

OK: Operating sound of ABS No.1 and ABS No.2 relays should be heard.

NG: GO TO step 6

OK: Go to next step

INSPECT ABS MAIN RELAY (ABS NO.1 RELAY, ABS NO.2 RELAY)

Remove the ABS No.1 relay and ABS No.2 relay.

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

Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
Terminal 1 - Terminal 2	100 Ω
Terminal 3 - Terminal 5	10 kΩ or higher (No Continuity)

Apply battery voltage between terminals 1 and 2.
Measure the resistance according to the value(s) in the table below.

Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
Terminal 3 - Terminal 5	Below 1 Ω

NG: REPLACE ABS NO.1 RELAY OR ABS NO.2 RELAY

Fig 1: Identifying ABS Main Relay (ABS No.1 Relay, ABS No.2 Relay)

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

OK: Go to next step

INSPECT FUSE (ABS NO.1, ABS NO.2 AND ABS NO.3 FUSES)

Remove the ABS No.1, ABS No.2 and ABS No.3 fuses.
Measure the resistance according to the value(s) in the table below.

Resistance

FUSE SPECIFIED CONDITION CHART

Fuse	Specified Condition
ABS No.1 Fuse	Below 1 Ω (Continuity)
ABS No.2 Fuse	Below 1 Ω (Continuity)
ABS No.3 Fuse	Below 1 Ω (Continuity)

NG: REPLACE FUSE

Fig 2: Identifying ABS No.1, ABS No.2 And ABS No.3 Fuses

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

OK: Go to next step

INSPECT SKID CONTROL ECU (+BI1, +BI2 TERMINAL)

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

Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
S39-3 (+BI1) - Body ground	10 to 14 V
S40-5 (+BI2) - Body ground	10 to 14 V

Fig 3: Identifying Skid Control ECU Connector Terminal (+B11, +B12 Terminal)

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT SKID CONTROL ECU (+BO1, +BO2, R1+, R2+ TERMINAL)

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

Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
S38-2 (R1+) - Body ground	10 to 14 V
S39-5 (+BO1) - Body ground	10 to 14 V
S40-4 (+BO2) - Body ground	10 to 14 V
S41-17 (R2+) - Body ground	10 to 14 V

Fig 4: Identifying Skid Control ECU Connector Terminal (+BO1, +BO2, R1+, R2+ Terminal)

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

NG: REPLACE SKID CONTROL ECU

OK: Go to next step

INSPECT SKID CONTROL ECU (BS1, BS2 TERMINAL)

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

Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
S38-3 (BS1) - Body ground	10 to 14 V
S41-7 (BS2) - Body ground	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 5: Identifying Skid Control ECU Connector Terminal (BS1, BS2 Terminal)

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

OK: REPLACE SKID CONTROL ECU