DTC    C0278/11    Open in ABS Solenoid Relay Circuit

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

for Preparation Click here


DESCRIPTION

The ABS solenoid relay supplies power to the ABS solenoid and TR(A)C 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.
The ABS solenoid relay is housed in the skid control ECU in the actuator assembly.

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 Detecting 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. ABS2 fuse
  2. ABS solenoid relay
  3. ABS solenoid relay circuit
  4. ABS and TRACTION actuator assembly
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 on.
  1. ABS2 fuse
  2. ABS solenoid relay
  3. ABS solenoid relay circuit
  4. ABS and TRACTION actuator assembly

WIRING DIAGRAM

Refer to DTCs C0226/21, C0236/22, C0246/23, C0256/24 and C1225/25 (Click here).

INSPECTION PROCEDURE

NOTICE:
When replacing the ABS and TRACTION actuator assembly, perform zero point calibration (Click here).

1.INSPECT FUSE (ABS2 FUSE)

  1. Remove the ABS2 fuse from engine room R/B (J/B) No.1.

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

    Resistance:
    Tester Connection
    		Specified Condition
    ABS2 fuse
    		Below 1 Ω (Continuity)



NG
REPLACE FUSE (ABS2 FUSE)
OK


2.INSPECT SKID CONTROL ECU (+BS AND GND1 TERMINAL)


    F049362E13

  1. Disconnect the skid control ECU connector.

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

    Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A48-31 (+BS) - Body ground
    		Always
    		10 to 14 V

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

    Resistance:
    Tester Connection
    		Specified Condition
    A48-32 (GND1) - Body ground
    		Below 1 Ω (Continuity)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS OR GND1 CIRCUIT)
OK


3.RECONFIRM DTC

  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 that the same DTC is recorded (Click here).

    HINT:
    Reinstall the sensors, connectors, etc. and restore the vehicle to its prior conditions before rechecking for DTCs.


    Result:

    Condition
    		Proceed To
    DTCs (C0278/11 and C0279/12) are not output
    		A
    DTCs (C0278/11 and 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 ABS and TRACTION actuator assembly. Make sure that no DTCs are output.
    3. If any DTCs are output while jiggling a connector or wire harness of the ABS and TRACTION actuator (skid control ECU), inspect and repair the connector or wire harness.



B
REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY
A

END