BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1421,C1423,C1424,C1449; Open or Short in Master Cylinder Pressure Sensor; 2016 - 2017 MY Sienna [12/2015

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM100000000VIWA
Model Year Start: 2016	Model: Sienna	Prod Date Range: [12/2015 - 11/2017]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1421,C1423,C1424,C1449; Open or Short in Master Cylinder Pressure Sensor; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

DTC

C1421

Open or Short in Master Cylinder Pressure Sensor

DTC

C1423

Master Cylinder Pressure Sensor Zero Point Low Malfunction

DTC

C1424

Master Cylinder Pressure Sensor Output Malfunction

DTC

C1449

Master Cylinder Output Value Malfunction

DESCRIPTION

The master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly.

DTC Code	DTC Detection Condition	Trouble Area
C1421	Either of the following is detected: With the IG1 terminal voltage between 9.5 and 17.4 V, the VCM terminal voltage is not between 4.64 and 5.37 V for 0.1 seconds or more. When the VCM terminal voltage is between 4.64 and 5.37 V, the PMC terminal voltage is not between 0.26 and 4.56 V for 0.1 seconds or more.	Master cylinder pressure sensor (brake actuator assembly)
C1423	The PMC terminal voltage is less than 0.27 V for 5 seconds or more.	Master cylinder pressure sensor (brake actuator assembly)
C1424	Any of the following is detected: Noise occurs in the PMC terminal 7 times or more within 5 seconds. When the vehicle speed drops from 40 km/h (25 mph) to 10 km/h (6 mph), the master cylinder pressure does not change by at least 0.048 MPa. At a vehicle speed 7 km/h (4.3 mph) or more, the PMC terminal voltage is between 0.86 and 1.0 V and does not change by at least 0.048 MPa for 60 seconds or more. At a vehicle speed 7 km/h (4.3 mph) or more, the PMC terminal voltage is 1.0 V or more and does not change by at least 0.048 MPa for 30 seconds or more.	Master cylinder pressure sensor (brake actuator assembly)
C1449	The master cylinder pressure sensor is in an invalid state for 0.2 seconds or more when the voltage at terminal IG1 is 8.4 V or higher.	Master cylinder pressure sensor (brake actuator assembly)

HINT:

for C1423 and C1424: Even after the trouble areas are repaired, the ABS warning light will not go off unless the following operations are performed:

Turn the ignition switch to ON.
Keep the vehicle stationary for 5 seconds or more and depress the brake pedal lightly 2 or 3 times.
Drive the vehicle at the vehicle speed of 50 km/h (31 mph) and depress and hold the brake pedal firmly for approximately 3 seconds.
Repeat the above operation 3 times or more and check that the ABS warning light goes off.
Clear the DTCs.

Refer to DTC C1425 (See page ).

NOTICE:

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

1.	REPLACE BRAKE ACTUATOR ASSEMBLY

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

(b) Perform zero point calibration of the yaw rate and acceleration sensor and store system information.

END