When replacing the skid control ECU perform the zero point calibration See Precheck

DTC C0278/11: ABS & VSC RELAY CIRCUIT

2004 BRAKES ABS With EBD & BA & TRAC & VSC System - Diagnostics - Sequoia

CIRCUIT DESCRIPTION

This relay supplies power to each ABS & VSC solenoid. After the ignition switch is turned ON, and if the initial check is OK, the relay turns on.

DTC No

DTC Detecting Condition

Trouble Area

C0278M1

Relay circuit continues to be open tor a fixed time when solenoid relay is ON after ignition switch is turned ON.

• AHS & VSC solenoid relay circuit

• ABS & VSC motor relay •ABS & VSC motor relay circuit

G0M2i7ee

Fig. 39: DTC Detecting Condition Trouble Area Table Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

WIRING DIAGRAM

Control ECU Actuator r-\

GND1

GND2

GOM21787

Fig. 40: Wiring Diagram ABS & VSC Relay Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. Check voltage between terminal +BS, +BM and GND of skid control ECU connector.

F10 Short

Fusible Link Connector

F10 Short

Fusible Link Connector

Vsc System

GND1

GND2

Fig. 40: Wiring Diagram ABS & VSC Relay Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2004 BRAKES ABS With EBD & BA & TRAC & VSC System - Diagnostics - Sequoia

PREPARATION:

Disconnect the skid control ECU connector. CHECK:

Measure the voltage between terminal +BS, +BM and GND of skid control ECU harness side connector. OK:

Fig. 41: Measuring Voltage B/W Terminal +BS, +BM & GND Of Skid Control ECU Harness Side Connector

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

Fig. 41: Measuring Voltage B/W Terminal +BS, +BM & GND Of Skid Control ECU Harness Side Connector

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

NG: Check and replace ABS fuses. Check and repair harness or connector.

OK: If the same code is still indicated after the DTC is deleted, check the contact condition of each connection. If the connections are normal, the skid control ECU may be defective.

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