Inspection Procedure

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

INSPECT BRAKE CONTROL POWER SUPPLY (IG1 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	Condition	Specified Condition
B24-5 (IG1) - Body ground	Ignition switch ON	10 to 14 V

Fig 1: Identifying Brake Control Power Supply Connector Terminal

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND BRAKE CONTROL POWER SUPPLY)

Turn the ignition switch off.
Disconnect the skid control ECU connector and brake control power supply connector.

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

Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
S39-30 (ENA) - B24-12 (ENA)	Below 1 Ω
S39-20 (FAIL) - B24-13 (FAIL)	Below 1 Ω

Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
S39-30 (ENA) - Body ground	10 kΩ or higher
S39-20 (FAIL) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying Skid Control ECU Connector And Brake Control Power Supply Connector

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

OK: Go to next step

CHECK FREEZE FRAME DATA

Check the INF code from the FREEZE FRAME DATA memorized when the DTC (C1378/44) is stored (See FREEZE FRAME DATA ).

Result

RESULT CHART

Condition	Proceed To
INF codes are not output	A
INF code (112) is output	B

B: REPLACE BRAKE CONTROL POWER SUPPLY

A: REPLACE SKID CONTROL ECU