SRR Solenoid Circuit - Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0226/21,C0236/22,C0246/23,C0256/24: SFR Solenoid Circuit
C0256/24 - SRL Solenoid Circuit

DESCRIPTION

These solenoids turn on when signals are received from the skid control ECU and control the pressure acting on the wheel cylinders to control the braking force.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU, perform zero point calibration and store system information Vehicle Stability Control System.

HINT
When C0278/11 and/or C0279/12 is output together with C0226/21, C0236/22, C0246/23, and/or C0256/24, inspect and repair the trouble areas indicated by C0278/11 and/or C0279/12 first C0278.

PROCEDURE

1. INSPECT BRAKE ACTUATOR ASSEMBLY

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.





(b) Disconnect the brake actuator connector.

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

Standard resistance:





NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.





(b) Disconnect the skid control ECU connectors.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. RECONFIRM DTC

(a) Reconnect the skid control ECU connectors and the brake actuator connector.

(b) Clear the DTCs Vehicle Stability Control System.

(c) Start the engine.

(d) Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

(e) Check if the same DTC is recorded Vehicle Stability Control System.

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 (no trouble codes are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU and/or brake actuator assembly. Make sure that no DTCs are output.
* If any DTCs are output while jiggling a connector or wire harness of the skid control ECU and/or brake actuator assembly, inspect and repair the connector or wire harness.
* It is suspected that the DTCs were output due to a bad connection of the connector terminal.
B -- REPLACE SKID CONTROL ECU Removal

A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System