Toyota Tundra. Manual — part 929

c. Check if the same DTC (s) is output (See DTC CHECK/CLEAR ).

Result

RESULT TABLE

HINT:

The DTCs may be stored due to a malfunction in the connector terminal.

B: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH
TROUBLESHOOTING )

A: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

DTC C0278/11: OPEN OR SHORT CIRCUIT IN ABS SOLENOID RELAY CIRCUIT

DESCRIPTION

The solenoid relay (skid control ECU interior circuit) supplies power to the ABS solenoid and TRC solenoid.

After the ignition switch is turned ON, the vehicle speed has reached 23 km/h (14 mph) and the solenoid is
determined to be normal by the initial check self-diagnosis, the relay switches on. If any open or short circuits
are detected, the relay switches off.

This DTC may be set if the voltage supply to the solenoid relay (+BS) falls below the DTC detection threshold
due to the battery or alternator outputs being insufficient.

DTC DETECTION CONDITION TABLE

WIRING DIAGRAM

Result

Proceed to

DTC is output

A

DTC is not output

B

DTC Code

DTC Detection Condition

Trouble Area

C0278/11

When either of following
conditions detected:

1. Malfunction in skid control

ECU continues for 0.056
seconds or more.

2. Voltage supply to solenoid

valve stops for 0.056 seconds
or more.



ABS2 fuse



Harness or connector (+BS
circuit)



Skid control ECU

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 45: Identifying ABS Solenoid Relay - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. INSPECT FUSE (ABS2)

a. Remove the ABS2 H-fuse from the engine room relay block.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

NOTE:

When replacing the VSC actuator assembly, perform zero point calibration (See
CALIBRATION ).

Tester Connection

Condition

Specified Condition

ABS2 H-fuse

Always

Below 1 ohms

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 46: Identifying ABS2 H-Fuse From Engine Room Relay Block
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO
FUSE AND REPLACE FUSE

OK: Go To Next Step

2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY

GROUND)

a. Disconnect the A17 ECU connector.

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection

Condition

Specified Condition

A17-47 (+BS) - Body ground

Always

11 to 14 V

Tester Connection

Condition

Specified Condition

A17-1 (GND1) - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 47: Identifying A17 Skid Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go To Next Step

3. RECONFIRM DTC

a. Clear the DTCs (See DTC CHECK/CLEAR ).

b. Start the engine.

c. Check if the same DTCs are output (See DTC CHECK/CLEAR ).

Result

RESULT TABLE

B: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH
TROUBLESHOOTING )

A: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

DTC C0371/71, C1232/32, C1234/34, C1244/44, C1279/79: YAW RATE SENSOR (TEST MODE DTC);
STUCK IN DECELERATION SENSOR; YAW RATE SENSOR MALFUNCTION; OPEN OR SHORT
IN DECELERATION SENSOR CIRCUIT; DECELERATION SENSOR OUTPUT VOLTAGE
MALFUNCTION (TEST MODE DTC)

DESCRIPTION

Result

Proceed to

DTC is output

A

DTC is not output

B

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra