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 from the data sent from the accumulator pressure sensor, and then starts 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 Code
INF Code
DTC Detection Condition
Trouble Area
C1365/54
331
Sensor supply voltage (VACC) is 4.54 V or less, or 5.46 V or more for 0.8 seconds or more.
Brake booster with master cylinder (Skid control ECU or brake actuator)
↑
332
Accumulator pressure sensor output voltage (PACC) is less than 8%, or 88% or more of sensor supply voltage for 0.8 seconds or more (less than 0.4 V, or 4.4 V or more for 0.8 seconds or more).
↑
↑
333
Fluctuation of sensor output is out of specification (the difference between the present value and last value is 7.5 MPa (76.5 kgf/cm2, 1088 psi)) for 0.8 seconds or more.
↑
↑
334
With the vehicle driven at 6 km/h (4 mph) or more and output value of the accumulator pressure sensor 19.7 MPa (201.0 kgf/cm2, 2857 psi) or less, the pump motor does not operate for 12 seconds or more.
↑

INSPECTION PROCEDURE

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

1.READ VALUE USING INTELLIGENT TESTER (ACCUMULATOR PRESSURE SENSOR)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Select the Data List on the intelligent tester (Click here).

    ABS/VSC/TRC 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Accumulator Sensor
    		Accumulator pressure sensor /
    Min.: 0 V, Max.: 5 V
    		Specified value: 2.9 to 4.2 V
    		When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator

  1. Wait for 30 seconds without depressing the brake pedal.

  1. Check that the accumulator pressure sensor output values change is within the specified range.

    OK:
    Accumulator pressure sensor output values change is within 0.55 V.


    Result:

    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)
A


2.RECONFIRM DTC

  1. Turn the power switch off.

  1. Clear the DTCs (Click here).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTC (C1365/54) is not output
    		A
    DTC (C1365/54) is output (for LHD)
    		B
    DTC (C1365/54) is output (for RHD)
    		C



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)
A

CHECK FOR INTERMITTENT PROBLEMS (Click here)