Electronically Controlled Brake System
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1246/46, C1281/81, C1364/61: Master Cylinder Pressure Sensor Malfunction
C1364/61 - Wheel Cylinder Pressure Sensor Malfunction
DESCRIPTION
The regulator pressure sensor and wheel cylinder pressure sensor are built into the brake actuator. They measure their respective pressures and send signals to the skid control ECU.
DTC C1281/81 will be cleared when the regulator pressure sensor sends a regulator pressure signal or when Test Mode ends. DTC C1281/81 is output only in Test Mode.
INSPECTION PROCEDURE
NOTICE:
When replacing the skid control ECU (brake booster with master cylinder assembly) or brake actuator (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve Initialization.
PROCEDURE
1. CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION
(a) Check the protrusion of the rod Installation.
OK:
Stop light switch assembly is installed properly.
HINT
If the stop light switch assembly is not installed properly, adjust the protrusion of the rod before proceeding to the next step.
NG -- ADJUST PROTRUSION OF ROD Installation
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (REGULATOR PRESSURE SENSOR)
(a) Mount a pedal effort gauge and install LSPV gauges to the rear wheels Component Tests and General Diagnostics.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Select the Data List on the Techstream Data List / Active Test.
ABS/VSC/TRAC
(e) Check the output value of the regulator pressure sensor as the brake pedal is depressed.
Standard Voltage:
NG -- REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Removal
OK -- Continue to next step.
3. READ VALUE USING TECHSTREAM (WHEEL CYLINDER PRESSURE SENSOR)
(a) Install LSPV gauges to the front wheels Component Tests and General Diagnostics.
(b) Select the Data List on the Techstream Data List / Active Test.
ABS/VSC/TRAC
(c) Check the output value of the wheel cylinder pressure sensor at each hydraulic pressure during electronically controlled brake system control.
Standard Voltage:
for Front Wheel Cylinder LH
for Front Wheel Cylinder RH
NG -- REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Removal
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM (BRAKE PEDAL STROKE SENSOR ASSEMBLY AND PRESSURE SENSOR COMPARISON)
(a) Mount a pedal effort gauge and install LSPV gauges to the front and rear wheels Component Tests and General Diagnostics.
(b) Select the Data List on the Techstream Data List / Active Test.
ABS/VSC/TRAC
(c) Check the output value of the brake pedal stroke sensor assembly as the brake pedal is depressed.
Standard Voltage:
NG -- REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY Removal
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Turn the power switch off.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Perform a road test.
(d) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Removal
A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting