Dtc C1281 Master Cylinder Pressure Sensor Output Malfunction (Test Mode Dtc)

Brake. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Brake Control. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT OPERATION

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH/BRAKE PEDAL LOAD SENSING SWITCH)

READ VALUE USING INTELLIGENT TESTER (MASTER CYLINDER SENSOR)

PERFORM TEST MODE (SIGNAL CHECK)

INSPECT SKID CONTROL ECU (STP TERMINAL)

INSPECT SKID CONTROL ECU (FSW+ TERMINAL)

CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

DTC C1281 Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC)


DESCRIPTION

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

DTC Code
DTC Detection Condition
Trouble Area
C1281
Detected only during Test Mode.
  1. Stop light switch
  2. Brake pedal load sensing switch
  3. Master cylinder pressure sensor

WIRING DIAGRAM

  1. Refer to DTC C1380 (RAV4_ACA30 RM000001N3L01AX_02.html).
  2. Refer to DTC C1429 (RAV4_ACA30 RM000000XIR026X_02.html).

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (RAV4_ACA30 RM000001K1O00SX.html).
1.CHECK STOP LIGHT OPERATION

  1. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

    OK:
    Condition
    		Illumination Condition
    Brake pedal depressed.
    		ON
    Brake pedal released.
    		OFF


NG
INSPECT STOP LIGHT CIRCUIT (RAV4_ACA30 RM000001OCJ00QX.html)
OK


2.READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH/BRAKE PEDAL LOAD SENSING SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Select the Data List mode on the intelligent tester (RAV4_ACA30 RM000000ONK01EX.html).

    ABS/VSC/TRC:
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Stop Light SW
    		Stop light switch / ON or OFF
    		ON: Brake pedal depressed
    OFF: Brake pedal released
    		-
    Brake Pedal Load Sensing SW
    		Brake pedal load sensing switch / ON or OFF
    		ON: Brake pedal depressed beyond the specified point
    OFF: Brake pedal not depressed beyond the specified point
    		-

  1. Check that the stop light switch display and brake pedal load sensing switch display observed on the intelligent tester change according to brake pedal operation.

    OK:
    The intelligent tester displays ON or OFF according to brake pedal operation.

  1. Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch turn ON.

    OK:
    First the stop light switch should turn ON, and then the brake pedal load sensing switch should turn ON.

    Result:

    Result
    		Proceed to
    OK
    		A
    NG
    		Turning on of the stop light switch is not confirmed.
    		B
    Turning on of the brake pedal load sensing switch is not confirmed.
    		C
    The brake pedal load sensing switch turns on first.
    		D


B
Go to step 5

C
Go to step 6

D
Go to step 7
A


3.READ VALUE USING INTELLIGENT TESTER (MASTER CYLINDER SENSOR)

  1. Select the Data List mode on the intelligent tester (RAV4_ACA30 RM000000ONK01EX.html).

    ABS/VSC/TRC:
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Master Cylinder Sensor
    		Master cylinder pressure sensor 1 reading / min.: 0 V, max.: 5 V
    		When brake pedal released: 0.3 to 0.9 V
    		Reading increases when the brake pedal depressed.

  1. Check that the brake fluid pressure value of the master cylinder pressure sensor observed on the intelligent tester changes when the brake pedal is depressed.

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


NG
REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200PX.html)
OK


4.PERFORM TEST MODE (SIGNAL CHECK)

  1. Turn the ignition switch off.

  1. Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).

    OK:
    All Test Mode DTCs are cleared.


NG
REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200PX.html)
OK

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (RAV4_ACA30 RM00000135201PX.html)

5.INSPECT SKID CONTROL ECU (STP TERMINAL)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1281 Master Cylinder Pressure Sensor Output Malfunction (Test Mode Dtc)

  1. Turn the ignition switch off.

  1. Make sure that there is no looseness in the locking part and connecting part of the connector.

  1. Disconnect the skid control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A67-2 (STP) - Body ground
    		Stop light switch on
    (Brake pedal depressed)
    		8 to 14 V
    A67-2 (STP) - Body ground
    		Stop light switch off
    (Brake pedal released)
    		Below 1.5 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200PX.html)

6.INSPECT SKID CONTROL ECU (FSW+ TERMINAL)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1281 Master Cylinder Pressure Sensor Output Malfunction (Test Mode Dtc)

  1. Turn the ignition switch off.

  1. Make sure that there is no looseness in the locking part and connecting part of the connector.

  1. Disconnect the skid control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A67-27 (FSW+) - Body ground
    		Brake pedal load sensing switch off
    (Brake pedal depressed)
    		0.9 to 1.1 kΩ
    A67-27 (FSW+) - Body ground
    		Brake pedal load sensing switch on
    (Brake pedal released)
    		192 to 234 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (FSW+ CIRCUIT)
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200PX.html)

7.CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

  1. Turn the ignition switch off.

  1. Check the brake pedal height and stop light switch installation (RAV4_ACA30 RM000001HJ300JX.html).

    OK:
    The brake pedal height and stop light switch installation are normal.


NG
ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH (RAV4_ACA30 RM000001HJ300JX.html)
OK

REPLACE BRAKE PEDAL SUPPORT ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH) (RAV4_ACA30 RM000001HJ600FX.html)