Dtc C0278/11 Open In Abs Solenoid Relay Circuit

Brake. Lexus Is250, Is220D. Gse20 Ale20
Brake Control. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT ABS3 FUSE

INSPECT ABS SOLENOID RELAY

INSPECT ENGINE ROOM NO. 3 RELAY BLOCK (POWER SOURCE TERMINAL)

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 3 RELAY BLOCK)

RECONFIRM DTC

DTC C0278/11 Open in ABS Solenoid Relay Circuit

DTC C0279/12 Short to B+ in ABS Solenoid Relay Circuit


DESCRIPTION

The ABS solenoid relay supplies power to the ABS solenoid and TRC solenoid.
The solenoid relay is turned on 1.5 seconds after the engine switch is turned on (IG), and is turned off if an open or short in the solenoid is detected by self diagnosis performed when the vehicle starts running.
HINT:
If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.

DTC No.
DTC Detection Condition
Trouble Area
C0278/11
When any of the following (1 or 2) is detected:
  1. All of the following conditions continue for 0.2 seconds or more.
    1. The IG1 terminal voltage is between 9.5 and 17.2 V.
    2. The solenoid relay contact is open when the relay is ON.
  2. All of the following conditions continue for 0.2 seconds or more.
    1. IG1 terminal voltage becomes lower than 9.5 V or less when the relay is turned on.
    2. The relay contact remains open.
  1. ABS3 fuse
  2. ABS solenoid relay
  3. ABS solenoid relay circuit
  4. Skid control ECU
C0279/12
Immediately after the engine switch is turned on (IG), the solenoid relay contact is closed for 0.2 seconds when the relay is turned off.
  1. ABS3 fuse
  2. ABS solenoid relay
  3. ABS solenoid relay circuit
  4. Skid control ECU

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0278/11 Open In Abs Solenoid Relay Circuit


INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU, perform zero point calibration and store system information (Click here).
1.INSPECT ABS3 FUSE


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0278/11 Open In Abs Solenoid Relay Circuit

  1. Remove the ABS3 fuse from the engine room No. 1 R/B.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    ABS3 (25 A) fuse
    		Always
    		Below 1 Ω


NG
REPLACE ABS3 FUSE
OK


2.INSPECT ABS SOLENOID RELAY


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0278/11 Open In Abs Solenoid Relay Circuit

  1. Install the ABS3 fuse.

  1. Remove the ABS SOL relay.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Always
    		10 kΩ or higher
    3 - 5
    		Apply B+ between terminals 1 and 2
    		Below 1 Ω


NG
REPLACE ABS SOLENOID RELAY
OK


3.INSPECT ENGINE ROOM NO. 3 RELAY BLOCK (POWER SOURCE TERMINAL)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0278/11 Open In Abs Solenoid Relay Circuit

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    ABS SOL relay terminal 3 - Body ground
    		Always
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK


4.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 3 RELAY BLOCK)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C0278/11 Open In Abs Solenoid Relay Circuit

  1. Disconnect the skid control ECU connectors.

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

    Standard resistance:
    LHD:
    Tester Connection
    		Condition
    		Specified Condition
    A35-11 (R+) - ABS SOL relay terminal 1
    		Always
    		Below 1 Ω
    A35-11 (R+) - Body ground
    		Always
    		10 kΩ or higher
    J78-2 (SR) - ABS SOL relay terminal 2
    		Always
    		Below 1 Ω
    J78-2 (SR) - Body ground
    		Always
    		10 kΩ or higher
    J78-13 (AST) - ABS SOL relay terminal 5
    		Always
    		Below 1 Ω
    J78-13 (AST) - Body ground
    		Always
    		10 kΩ or higher
    RHD:
    Tester Connection
    		Condition
    		Specified Condition
    J98-11 (R+) - ABS SOL relay terminal 1
    		Always
    		Below 1 Ω
    J98-11 (R+) - Body ground
    		Always
    		10 kΩ or higher
    J78-2 (SR) - ABS SOL relay terminal 2
    		Always
    		Below 1 Ω
    J78-2 (SR) - Body ground
    		Always
    		10 kΩ or higher
    J78-13 (AST) - ABS SOL relay terminal 5
    		Always
    		Below 1 Ω
    J78-13 (AST) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.RECONFIRM DTC

  1. Install the ABS SOL relay.

  1. Reconnect the skid control ECU connectors.

  1. Clear the DTC (Click here).

  1. Start the engine.

  1. Drive the vehicle at the speed of 4 mph (6 km/h) or more.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Condition
    		Proceed to
    DTCs (C0278/11 and/or C0279/12) are not output
    		A
    DTCs (C0278/11 and/or C0279/12) are output
    		B
    HINT:
    1. If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
    2. If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harnesses, and fuses of the skid control ECU and brake actuator assembly. Make sure that no DTCs are output.
    3. If any DTCs are output while jiggling a connector or wire harness of the skid control ECU and brake actuator assembly, inspect and repair the connector or wire harness.


B
REPLACE SKID CONTROL ECU
A

USE SIMULATION METHOD TO CHECK