Toyota Tacoma (2015-2018) Service Manual: Open or Short in Master Cylinder Pressure Sensor (C1421,C1423,C1424,C142A,C1449)

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / Open or Short in Master Cylinder Pressure Sensor (C1421,C1423,C1424,C142A,C1449)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1421	Open or Short in Master Cylinder Pressure Sensor	Any of the following is detected: When voltage at terminal +BS is 9.5 V or higher, power supply voltage of master cylinder pressure sensor is continuously low for 1 second or more. When master cylinder pressure sensor power supply voltage has risen, master cylinder pressure sensor has overheated or overcurrent of master cylinder pressure sensor continues for 0.1 seconds or more. When +BS terminal voltage is 9.5 to 17.4 V, there is no communication with master cylinder pressure sensor continuously for 0.1 seconds or more.	Brake actuator assembly (Master cylinder pressure sensor)
C1423	Master Cylinder Pressure Sensor Zero Point Low Malfunction	Master cylinder pressure is below -0.744 MPa (-7.6 kgf/cm2, -107 psi) for 5 seconds or more.	Brake actuator assembly (Master cylinder pressure sensor)
C1424	Master Cylinder Pressure Sensor Output Malfunction	Any of the following is detected: When vehicle speed is 7 km/h (4.3 mph) or more and master cylinder pressure exceeds 1.764 MPa (18.0 kgf/cm2, 255 psi), master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more continuously for 60 seconds. When vehicle speed is 7 km/h (4.3 mph) and master cylinder pressure is 2.45 MPa (25.0 kgf/cm2, 355 psi) or more, master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more continuously for 30 seconds. Master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more 5 times or more while vehicle speed decreases from 40 km/h (25 mph) to 0 km/h (0 mph). When vehicle speed is 10 km/h (6 mph) or more, noise in master cylinder pressure value occurs 7 times or more in 5 seconds. When vehicle speed is 7 km/h (4.3 mph) or more, braking is performed (stop light switch assembly is ON) and master cylinder pressure differential value is below 20 MPa/s, difference between master cylinder pressure estimated from vehicle deceleration and master cylinder pressure sensor input value is large for 1 second or more 5 times or more.	Brake actuator assembly (Master cylinder pressure sensor)
C142A	Master Cylinder Pressure Sensor Internal Malfunction	Any of the following is detected: Master cylinder pressure is 23.328 MPa (237.8 kgf/cm2, 3382 psi) or more continuously for 0.1 seconds. Master cylinder temperature is 150°C (302°F) or more continuously for 0.1 seconds.	Brake actuator assembly (Master cylinder pressure sensor)
C1449	Master Cylinder Output Value Malfunction	Master cylinder pressure sensor invalid condition continues for 0.2 seconds or more.	Brake actuator assembly (Master cylinder pressure sensor)

HINT:

DTC will be output when conditions for any of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page PROCEDURE ).

PROCEDURE

1.	REPLACE BRAKE ACTUATOR ASSEMBLY

(a) Replace the brake actuator assembly (master cylinder pressure sensor) (See page ).

END

Acceleration Sensor Internal Circuit (C1419,C1435)

DESCRIPTION The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system. The airbag sensor ...

Master Cylinder Pressure Sensor Zero Point High Malfunction (C1422)

DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area C1422 Master Cylinder Pressure Sensor Zero Point High M ...

Other materials:

Control Module Communication Bus OFF (U0073,U0100,U0124,U0126)
DESCRIPTION The skid control ECU (brake actuator assembly) receives the signals from the ECM, steering angle sensor (spiral cable with sensor sub-assembly), 4 wheel drive control ECU*, and yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system. *: f ...

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE NO. 1 HEATER TO REGISTER DUCT (a) Remove the 2 screws <F> and screw <D>. (b) Disengage the 2 guides to remove the No. 1 heater to register duct. 2. REMOVE NO. 3 HEATER TO REGISTER DUCT ...

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Trouble Codes. (e) Check DTCs and then write them down. HINT: Refer to the Techstream operator's manual ...