DTC 61

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1246/46,C1281/81,C1364/61: Master Cylinder Pressure Sensor Malfunction

DTC C1246/46 - Master Cylinder Pressure Sensor Malfunction

DTC C1281/81 - Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC)

DTC C1364/61 - Wheel Cylinder Pressure Sensor Malfunction

DESCRIPTION

The master cylinder pressure sensor and the wheel cylinder pressure sensor are built into the brake actuator, and measure the master cylinder pressure and the wheel cylinder pressure sent to the skid control ECU.
DTC C1281/81 can be deleted when the master cylinder pressure sensor sends a master cylinder pressure signal or the Test Mode ends. DTC C1281/81 is output only in the Test Mode.














WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE: When replacing the skid control ECU or brake actuator assembly, perform initialization of linear solenoid valve and calibration Initialization.

PROCEDURE

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




(a) Disconnect the skid control ECU connectors and the brake actuator connector.
(b) 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.
2. INSPECT SKID CONTROL ECU (SENSOR INPUT)




(a) Reconnect the skid control ECU connectors.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(d) Turn the power switch off.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE SKID CONTROL ECU
OK -- Continue to next step.
3. READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE SENSOR)
(a) Reconnect the brake actuator connector.
(b) Connect the pedal effort gauge On-Vehicle Inspection.
(c) Connect Techstream to the DLC3.
(d) Turn the power switch on (IG).
(e) Select the Data List mode on Techstream.

ABS / VSC / TRAC:





(f) Check the output value of the master cylinder pressure sensor at each fluid pressure.
HINT:
- Check the value while Electronically Controlled Brake control is being prohibited without servo assistance.
- The brake control warning light is on while Electronically Controlled Brake control is being prohibited.

Standard voltage:






NG -- REPLACE BRAKE ACTUATOR ASSEMBLY
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM (WHEEL CYLINDER PRESSURE SENSOR)
(a) Turn the power switch off.
(b) Install the hydro LSPV gauge (SST) and bleed air On-Vehicle Inspection.
SST: 09709-29018
(c) Turn the power switch on (IG).
(d) Select the Data List mode on Techstream.

ABS / VSC / TRAC:





(e) Check the output value of the wheel cylinder pressure sensor at each fluid pressure during the Electronically Controlled Brake control.
Standard voltage:
Front wheel cylinder pressure sensor
Rear wheel cylinder pressure sensor










NG -- REPLACE BRAKE ACTUATOR ASSEMBLY
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Turn the power switch off.
(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(c) Perform the road and braking test.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- REPLACE SKID CONTROL ECU
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)