DTC C1246: Master Cylinder Pressure Sensor; DTC C1281: Abnormal Output in Master Cylinder Pressure Sensor; DTC C1364: Wheel Cylinder Pressure Sensor [02/2019 - 12/2021]: 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 (brake booster with master cylinder assembly).

DTC C1281 will be cleared when the regulator pressure sensor sends a regulator pressure signal or when Test Mode ends. DTC C1281 is output only in Test Mode.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1246	Master Cylinder Pressure Sensor	201 202 203 204 207	INF Code: 201 Sensor supply voltage (VCM1) is 4.75 V or less, or 5.25 V or more for 0.05 seconds. INF Code: 202 Regulator pressure sensor output voltage (Preg) is less than 8%, or 90.3% or more (less than 0.4 V, or 4.52 V or more) of sensor supply voltage (VCM1) for 0.05 seconds or more. INF Code: 203 When not under braking, the regulator pressure sensor output voltage is 0.2 V or less or 0.88 V or more for 3 seconds or more. INF Code: 204 Either of the following is detected: The regulator pressure sensor output voltage does not correspond with brake pedal stroke sensor assembly and the readings remain out of specification for 0.5 to 5 seconds or more continuously. (The brake pedal stroke sensor assembly may be malfunctioning.) The regulator pressure sensor output voltage does not correspond with wheel cylinder pressure sensor and the outputs remain out of specification for 0.5 to 5 seconds or more continuously. (May be output with INF code 424.) INF Code: 207 Fluctuation of regulator pressure sensor output is out of specification (the difference between the present value and last value is 15 MPa (153.0 kgf/cm² , 2176 psi) or more) for 0.1 seconds or more.	INF Code: 201, 202, 203, 207 Brake booster with master cylinder assembly INF Code: 204 Brake pedal stroke sensor assembly Brake booster with master cylinder assembly	-
C1281	Abnormal Output in Master Cylinder Pressure Sensor	-	Detected only during Test Mode.	Stop light switch assembly Regulator pressure sensor (Brake booster with master cylinder assembly)	-
C1364	Wheel Cylinder Pressure Sensor	421 422 423 424 426	INF Code: 421 Sensor supply voltage 1 (VCM1) is 4.75 V or less, or 5.25 V or more for 0.05 seconds or more. INF Code: 422 Wheel cylinder pressure sensor output voltage (Pfront) is less than 8%, or 90.3% or more (less than 0.4 V, or 4.52 V or more) of sensor supply voltage (VCM1) for 0.05 seconds or more. INF Code: 423 When not under braking, the wheel cylinder pressure sensor output voltage is 0.2 V or less or 0.88 V or more for 0.1 to 3 seconds or more. INF Code: 424 The wheel cylinder pressure sensor output voltage does not correspond with regulator pressure sensor and the outputs remain out of specification for 0.5 to 5 seconds or more continuously. (May be output with INF code 204.) INF Code: 426 Fluctuation of wheel cylinder pressure sensor output is out of specification (the difference between the present value and last value is 15 MPa (153.0 kgf/cm² , 2176 psi) or more) for 0.1 seconds or more.	Brake booster with master cylinder assembly	-

DTC DETECTION CONDITIONS: C1246 INF CODE: 204

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	-	-	-
Malfunction Status	The regulator pressure sensor output voltage does not correspond with brake pedal stroke sensor assembly and the readings remain out of specification for 0.5 to 5 seconds or more continuously (The brake pedal stroke sensor assembly may be malfunctioning)	◦	-
Malfunction Status	The regulator pressure sensor output voltage does not correspond with wheel cylinder pressure sensor and the outputs remain out of specification for 0.5 to 5 seconds or more continuously (May be output with INF code 424)	-	◦
Detection Time		-	-
Number of Trips		1 trip	1 trip

HINT:

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