C1365

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1365/54: Accumulator Pressure Sensor Malfunction

DTC C1365/54 - Accumulator Pressure Sensor Malfunction

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 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).






WIRING DIAGRAM






INSPECTION PROCEDURE
NOTE: When replacing the skid control ECU or brake actuator assembly, perform initialization and calibration of the linear solenoid valve. Initialization

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.





(b) Disconnect the skid control ECU connector and the brake actuator connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. INSPECT SKID CONTROL ECU (SENSOR INPUT)





(a) Reconnect the skid control ECU connector and the brake actuator connector.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE SKID CONTROL ECU
OK -- Continue to next step.
3. INSPECT SKID CONTROL ECU (SENSOR OUTPUT)





(a) Depress the brake pedal to operate the pump motor, and then check that the pump motor stops.
(b) Measure the voltage according to the value(s) in the table below.
NOTE: Do not depress the brake pedal until the pump motor stops and the voltage check is finished in order to keep the accumulator pressure.

Standard voltage:






NG -- REPLACE BRAKE ACTUATOR ASSEMBLY
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM (ACCUMULATOR PRESSURE SENSOR)
(a) Turn the power switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Select the Data List mode on the Techstream. Data List / Active Test

ABS / VSC / TRAC:





(e) Depress the brake pedal 4 or 5 times to operate the pump motor, and check the output value on the Techstream with the motor stopped (brake pedal not depressed).
OK:
Accumulator pressure sensor voltage does not drop.
NG -- REPLACE BRAKE ACTUATOR ASSEMBLY
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Turn the power switch off.
(b) Clear the DTCs.
(c) Perform a road test.
(d) Check if the same DTC is recorded.
Result:






B -- REPLACE SKID CONTROL ECU
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)