C1365

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

DTC C1365/54 - Accumulator Pressure Sensor Malfunction

DESCRIPTION

The accumulator (ACC) 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, perform initialization of linear solenoid valve and calibration Initialization.

PROCEDURE

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

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

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

(a) Measure the voltage according to the value(s) in the table below.
HINT: Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

Voltage:

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

(a) Check the auxiliary battery voltage.
Voltage:
10 to 14 V
(b) Depress the brake pedal to operate the pump motor, and then check that the pump motor stops.
(c) Measure the voltage according to the value(s) in the table below.
Voltage:

NOTICE:
- Do not depress the brake pedal until the pump motor stops and the voltage check is finished in order to keep the accumulator pressure.
- Check from the back side of the connector with the connector connected to the skid control ECU.
- Do not use a Data List, as the sensor itself must be checked.

NG -- REPLACE BRAKE ACTUATOR ASSEMBLY
OK -- Continue to next step.
4. READ VALUE OF TECHSTREAM (ACCUMULATOR PRESSURE SENSOR)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch on.
(c) Select the Data List mode on Techstream.

ABS / VSC / TRAC:

(d) Depress the brake pedal 4 or 5 times to operate the pump motor, and check the output value on Techstream with the motor stopped (no braking).
OK:
Accumulator (ACC) pressure sensor voltage does not drop.
NG -- REPLACE BRAKE ACTUATOR ASSEMBLY
OK -- REPLACE SKID CONTROL ECU