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

for Preparation Click here


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.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
C1246/46
191
Sensor power source 1 (VCM) voltage is less than 4.7 V or 5.3 V or more for at least 0.05 seconds.
  1. Master cylinder pressure sensor
  2. Master cylinder pressure sensor circuit
  3. Master cylinder pressure sensor power supply
  4. Brake actuator assembly
  5. Skid control ECU
↑
192
M/C pressure sensor output voltage 1 (PMC1) is less than 0.25 V or 4.53 V or more for at least 0.05 seconds.
  1. Master cylinder pressure sensor
  2. Master cylinder pressure sensor circuit
  3. Brake actuator assembly
  4. Skid control ECU
↑
194
Sensor power source 2 (VCM2) voltage is less than 4.7 V or 5.3 V or more for at least 0.05 seconds.
  1. Master cylinder pressure sensor
  2. Master cylinder pressure sensor circuit
  3. Master cylinder pressure sensor power supply
  4. Brake actuator assembly
  5. Skid control ECU
↑
195
M/C pressure sensor output voltage 2 (PMC2) is less than 0.25 V or 4.53 V or more for at least 0.05 seconds.
  1. Master cylinder pressure sensor
  2. Master cylinder pressure sensor circuit
  3. Brake actuator assembly
  4. Skid control ECU
↑
197
M/C pressure sensor output voltage 1 (PMC1) is abnormal.
  1. Brake actuator assembly
  2. Skid control ECU
↑
198
M/C pressure sensor output voltage 2 (PMC2) is abnormal.
↑
↑
199
M/C pressure sensor output voltage 1 (PMC1) is less than 0.33 V or 0.85 V or more when not braking.
  1. Master cylinder pressure sensor
  2. Master cylinder pressure sensor circuit
  3. Brake actuator assembly
  4. Skid control ECU
↑
200
M/C pressure sensor output voltage 2 (PMC2) is less than 0.33 V or 0.85 V or more when not braking.
↑
↑
201
PMC1 and PMC2 voltages are different when braking.
↑
↑
202
M/C pressure sensor 1 data (PMC1) is invalid.
  1. Master cylinder pressure sensor power supply
  2. Brake actuator assembly
  3. Skid control ECU
↑
205
M/C pressure sensor 2 data (PMC2) is invalid.
↑
C1364/61
221
Sensor power source 1 (VCM) voltage is less than 4.7 V or 5.3 V or more for at least 0.05 seconds.
  1. Wheel cylinder pressure sensor power supply
  2. Brake actuator assembly
  3. Skid control ECU
↑
222
FR right sensor output voltage (PFR) is less than 0.25 V or 4.5 V or more for at least 0.05 seconds.
  1. Wheel cylinder pressure sensor
  2. Wheel cylinder pressure sensor circuit
  3. Brake actuator assembly
  4. Skid control ECU
↑
224
When any of the following is detected:
  1. FR right sensor output (PFR) is less than 0.33 V or more 0.85 V or more when not braking.
  2. FR right sensor (PFR) zero point malfunction.
  3. Open or short in FR right sensor (PFR) circuit.
↑
↑
225
The PFR output voltage is stuck at 4.7 V or less.
↑
↑
227
Sensor power source 2 (VCM2) voltage is less than 4.7 V or 5.3 V or more for at least 0.05 seconds.
  1. Wheel cylinder pressure sensor power supply
  2. Brake actuator assembly
  3. Skid control ECU
↑
228
FR left sensor output voltage (PFL) is less than 0.25 V or 4.5 V or more for at least 0.05 seconds.
  1. Wheel cylinder pressure sensor
  2. Wheel cylinder pressure sensor circuit
  3. Brake actuator assembly
  4. Skid control ECU
↑
230
When any of the following is detected:
  1. FR left sensor output (PFL) is less than 0.33 V or 0.85 V or more when not braking.
  2. FR left sensor (PFL) zero point malfunction.
  3. Open or short in FR left sensor (PFR) circuit.
↑
↑
231
The PFL output voltage is stuck at 4.7 V or less.
↑
↑
233
Sensor power source 2 (VCM2) voltage is less than 4.7 V or 5.3 V or more for at least 0.05 seconds.
  1. Wheel cylinder pressure sensor power supply
  2. Brake actuator assembly
  3. Skid control ECU
↑
234
RR right sensor output voltage (PRR) is less than 0.25 V or 4.5 V or more for at least 0.05 seconds.
  1. Wheel cylinder pressure sensor
  2. Wheel cylinder pressure sensor circuit
  3. Brake actuator assembly
  4. Skid control ECU
↑
236
When any of the following is detected:
  1. RR right sensor output (PRR) is less than 0.33 V or 0.85 V or more when not braking.
  2. RR right sensor (PRR) zero point malfunction.
  3. Open or short in RR right sensor (PRR) circuit.
↑
↑
237
The PRR output voltage is stuck at 4.7 V or less.
↑
↑
239
Sensor power source 1 (VCM) voltage is less than 4.7 V or 5.3 V or more for at least 0.05 seconds.
  1. Wheel cylinder pressure sensor power supply
  2. Brake actuator assembly
  3. Skid control ECU
↑
240
RR left sensor output voltage (PRL) is less than 0.25 V or 4.5 V or more for at least 0.05 seconds.
  1. Wheel cylinder pressure sensor
  2. Wheel cylinder pressure sensor circuit
  3. Brake actuator assembly
  4. Skid control ECU
↑
242
When any of the following is detected:
  1. RR left sensor output (PRL) is less than 0.33 V or 0.85 V or more when not braking.
  2. RR left sensor (PRL) zero point malfunction.
  3. Open or short in RR left sensor (PRL) circuit.
↑
↑
243
The PRL output voltage is stuck at 4.7 V or less.
↑

WIRING DIAGRAM


C109405E01


INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU or brake actuator assembly, perform initialization of linear solenoid valve and calibration (Click here).

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


    C112737E01

  1. Disconnect the skid control ECU (A13, A15) connectors and brake actuator assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    LHD:
    Tester Connection
    		Specified Condition
    A13-9 (PCK1) - A16-37 (PCK1)
    		Below 1 Ω
    A13-14 (PMC1) - A16-38 (PMC1)
    		Below 1 Ω
    A13-26 (PAC1) - A16-46 (PAC1)
    		Below 1 Ω
    A13-27 (VCM) - A16-35 (VCM)
    		Below 1 Ω
    A13-42 (PRL) - A16-36 (PRL)
    		Below 1 Ω
    A13-43 (E) - A16-45 (E)
    		Below 1 Ω
    A13-44 (PFR) - A16-34 (PFR)
    		Below 1 Ω
    A15-6 (PCK2) - A16-42 (PCK2)
    		Below 1 Ω
    A15-12 (PMC2) - A16-43 (PMC2)
    		Below 1 Ω
    A15-24 (VCM2) - A16-40 (VCM2)
    		Below 1 Ω
    A15-37 (PRR) - A16-41 (PRR)
    		Below 1 Ω
    A15-38 (E2) - A16-44 (E2)
    		Below 1 Ω
    A15-39 (PFL) - A16-39 (PFL)
    		Below 1 Ω

    Resistance:
    RHD:
    Tester Connection
    		Specified Condition
    A13-9 (PCK1) - A16-12 (PCK1)
    		Below 1 Ω
    A13-14 (PMC1) - A16-13 (PMC1)
    		Below 1 Ω
    A13-26 (PAC1) - A16-15 (PAC1)
    		Below 1 Ω
    A13-27 (VCM) - A16-10 (VCM)
    		Below 1 Ω
    A13-42 (PRL) - A16-11 (PRL)
    		Below 1 Ω
    A13-43 (E) - A16-14 (E)
    		Below 1 Ω
    A13-44 (PFR) - A16-9 (PFR)
    		Below 1 Ω
    A15-6 (PCK2) - A16-7 (PCK2)
    		Below 1 Ω
    A15-12 (PMC2) - A16-8 (PMC2)
    		Below 1 Ω
    A15-24 (VCM2) - A16-5 (VCM2)
    		Below 1 Ω
    A15-37 (PRR) - A16-6 (PRR)
    		Below 1 Ω
    A15-38 (E2) - A16-16 (E2)
    		Below 1 Ω
    A15-39 (PFL) - A16-4 (PFL)
    		Below 1 Ω

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		Specified Condition
    A13-9 (PCK1) - Body ground
    		10 kΩ or higher
    A13-14 (PMC1) - Body ground
    		10 kΩ or higher
    A13-26 (PAC1) - Body ground
    		10 kΩ or higher
    A13-27 (VCM) - Body ground
    		10 kΩ or higher
    A13-42 (PRL) - Body ground
    		10 kΩ or higher
    A13-43 (E) - Body ground
    		10 kΩ or higher
    A13-44 (PFR) - Body ground
    		10 kΩ or higher
    A15-6 (PCK2) - Body ground
    		10 kΩ or higher
    A15-12 (PMC2) - Body ground
    		10 kΩ or higher
    A15-24 (VCM2) - Body ground
    		10 kΩ or higher
    A15-37 (PRR) - Body ground
    		10 kΩ or higher
    A15-38 (E2) - Body ground
    		10 kΩ or higher
    A15-39 (PFL) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.READ VALUE OF INTELLIGENT TESTER (MASTER CYLINDER PRESSURE SENSOR)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Select the DATA LIST mode on the intelligent tester.

    ABS / VSC / TR(A)C: 
    Item (Display)
    		Measurement Item /
    Range (Display)
    		Normal Condition
    Master Cylinder Sensor
    		Master cylinder pressure sensor 1 reading / min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.3 to 0.9 V
    Master Cylinder Sensor 2
    		Master cylinder pressure sensor 2 reading / min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.3 to 0.9 V

  1. Check the output value of the master cylinder pressure sensor on the intelligent tester display.

    OK:
    When the pedal is depressed, the voltage displayed on the intelligent tester increases.



NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


3.READ VALUE OF INTELLIGENT TESTER (WHEEL CYLINDER PRESSURE SENSOR)

  1. Connect the pedal effort gauge.

  1. Install the LSPV gauge (SST) and bleed air (Click here).

SST
09709-29018  

  1. Connect the intelligent tester to the DLC3.

  1. Select the DATA LIST mode on the intelligent tester.

    ABS / VSC / TR(A)C: 
    Item (Display)
    		Measurement Item /
    Range (Display)
    		Normal Condition
    FR W/C Sensor
    		FR wheel cylinder pressure sensor / min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.3 to 0.9 V
    FL W/C Sensor
    		FL wheel cylinder pressure sensor / min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.3 to 0.9 V
    RR W/C Sensor
    		RR wheel cylinder pressure sensor / min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.3 to 0.9 V
    RL W/C Sensor
    		RL wheel cylinder pressure sensor / min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.3 to 0.9 V

  1. Check the output value of the wheel cylinder pressure sensor at each fluid pressure during the ECB control.

    Voltage:
    Front Wheel Cylinder Pressure Sensor:

    Fluid Pressure
    MPa (kgf/cm2, psi)
    		FR W/C Sensor
    (DATA LIST)
    		FL W/C Sensor
    (DATA LIST)
    3.2 (32.6, 464)
    		1.0 to 1.3 V
    		1.0 to 1.3 V
    7.0 (71.4, 1016)
    		1.75 V to 2.05 V
    		1.75 V to 2.05 V
    8.3 (84.6, 1203)
    		2.05 to 2.35 V
    		2.05 to 2.35 V
    Rear Wheel Cylinder Pressure Sensor:

    Fluid Pressure
    MPa (kgf/cm2, psi)
    		RR W/C Sensor
    (DATA LIST)
    		RL W/C Sensor
    (DATA LIST)
    3.1 (31.6, 449)
    		1.0 to 1.3 V
    		1.0 to 1.3 V
    4.0 (40.8, 580)
    		1.15 V to 1.45 V
    		1.15 V to 1.45 V



NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


4.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Perform the road and braking test.

  1. Check if the same DTCs are recorded (Click here).

    HINT:
    Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.


    Result:

    Condition
    		Proceed To
    DTCs (C1246/46 and C1364/61) are output
    		A
    DTCs (C1246/46 and C1364/61) are not output
    		B



B
END
A


5.CHECK FREEZE FRAME DATA

  1. Check the INF code from the FREEZE FRAME DATA memorized when the DTCs (C1246/46 and C1364/61) are stored (Click here).

    Result:

    Condition
    		Proceed To
    Sensor power supply malfunction (191, 194, 221, 227, 233 and 239) codes are output
    		A
    Sensor output malfunction (except 191, 194, 221, 227, 233 and 239) codes are output
    		B



B
REPLACE BRAKE ACTUATOR ASSEMBLY
A

REPLACE SKID CONTROL ECU