C0279

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0278/11,C0279/12: Open in ABS Solenoid Relay Circuit


DESCRIPTION

The ABS solenoid relay supplies power to the ABS solenoid and TRAC 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 6 km/h (4 mph) or more is input to the skid control ECU, with the engine switch turned on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.





WIRING DIAGRAM

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

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration Calibration.

PROCEDURE

1. INSPECT ABS NO. 2 FUSE

(a) Remove the fusible link from the engine room R/B.





Text in Illustration





(b) Check if the fusible link is melted.





OK:

The fusible link is not melted.

(c) Install the fusible link to the engine room R/B with the nut.

Text in Illustration





Torque : 5.4 Nm (55 kgf-cm, 48 in-lbf)

NG -- REPLACE FUSIBLE LINK (ABS NO. 2 FUSE)
OK -- Continue to next step.

2. INSPECT SKID CONTROL ECU (+BS TERMINAL)

(a) Disconnect the skid control ECU connector.





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

Standard voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS CIRCUIT)
OK -- Continue to next step.

3. INSPECT SKID CONTROL ECU (GND TERMINAL)

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





Standard resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.

4. RECONFIRM DTC

(a) Reconnect the skid control ECU connector.

(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(c) Start the engine.

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

(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
- If a speed signal of 6 km/h (4 mph) 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.
- If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harnesses, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
- If any DTCs are output while jiggling a connector or wire harness of the brake actuator assembly (skid control ECU), inspect and repair the connector or wire harness.

B -- REPLACE BRAKE ACTUATOR ASSEMBLY

A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)