DTC    C1365/54    Accumulator Pressure Sensor Malfunction

for Preparation Click here


DESCRIPTION

The accumulator pressure sensor is built into the brake actuator.
The skid control ECU detects the accumulator pressure based on the data sent from the accumulator pressure sensor, and then runs and stops the pump motor by operating the motor relay.
DTCs may be output if the accumulator pressure drops due to frequent braking (this is not a malfunction).

DTC No.
INF Code
DTC Detection Condition
Trouble Area
C1365/54
211
Sensor power 1 (VCM1) voltage is 4.7 V or less or 5.3 V or more for at least 0.05 seconds.
  1. Accumulator pressure sensor
  2. Accumulator pressure sensor circuit
  3. Accumulator pressure sensor power supply
  4. Brake actuator assembly
  5. Skid control ECU
↑
212
Accumulator pressure sensor output voltage (PAC1) is less than 0.25 or 4.5 V or more for at least 0.05 seconds.
↑
↑
214
While the motor is OFF, the total of the wheel cylinder pressure sensor values of all 4 wheels increases but the accumulator pressure changes little for 0.5 seconds or more.
↑
↑
215
The accumulator pressure sensor output voltage (PAC1) is stuck at 4.7 V or less.
↑

WIRING DIAGRAM

Refer to DTCs C1246/46 and C1364/61 (Click here).

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)


    C112751E02

  1. Disconnect the skid control ECU 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
    A13-26 (PAC1) - A16-46 (PAC1)
    		Below 1 Ω
    A13-27 (VCM) - A16-35 (VCM)
    		Below 1 Ω
    A13-43 (E) - A16-45 (E)
    		Below 1 Ω

    Resistance:
    RHD:
    Tester Connection
    		Specified Condition
    A13-9 (PCK1) - A16-12 (PCK1)
    		Below 1 Ω
    A13-26 (PAC1) - A16-15 (PAC1)
    		Below 1 Ω
    A13-27 (VCM) - A16-10 (VCM)
    		Below 1 Ω
    A13-43 (E) - A16-14 (E)
    		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
    A13-26 (PAC1) - Body ground
    		10 kΩ or higher
    A13-27 (VCM) - Body ground
    		10 kΩ or higher
    A13-43 (E) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Turn the engine switch on (IG).

  1. Check if the same DTC is 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
    DTC (C1365/54) is output
    		A
    DTC (C1365/54) is not output
    		B



B
END
A


3.CHECK FREEZE FRAME DATA

  1. Check the INF code from the FREEZE FRAME DATA memorized when the DTC (C1365/54) is stored (Click here).

    Result:

    Condition
    		Proceed To
    Sensor power supply voltage trouble (211) codes are output
    		A
    Sensor output value trouble (212, 214 and 215) codes are output
    		B



B
REPLACE BRAKE ACTUATOR ASSEMBLY
A

REPLACE SKID CONTROL ECU