Last Modified: 11-29-2007 1.6 C
Service Category: Brake Section: Brake Control/Dynamic Control System
Model Year: 2008 Model: Sequoia Doc ID: RM000000WF000VX
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

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 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)
  • VSC actuator (skid control ECU)

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the VSC actuator assembly, perform zero point calibration BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION (2008 Sequoia) .

PROCEDURE

1.

INSPECT FUSE (ABS2)

(a) Remove the ABS2 fuse from the engine room relay block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

ABS2 fuse

Always

Below 1 Ω
OK

2.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY GROUND)

(a) Disconnect the A19 ECU connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A19-47 (+BS) - Body ground

Always

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A19-1 (GND1) - Body ground

Always

Below 1 Ω
OK

3.

RECONFIRM DTC

(a) Clear the DTCs BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(b) Start the engine.

(c) Check if the same DTCs are output BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

Result

Result

Proceed to

DTC is output

A

DTC is not output

B
A