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DTC C0044:1C, C0044:28, C0044:49, C0044:54, C0044:56, C0044:64, C0044:84 OR C0044:85 [ELECTRONICALLY CONTROLLED BRAKE UNIT]

id0402c6004900

Outline

System malfunction location

DTC C0044:1C or C0044:54

Brake fluid pressure sensor

DTC C0044:28, C0044:49, C0044:56, C0044:64, C0044:84 or C0044:85

Brake fluid pressure sensor (master cylinder side)

Detection condition

•  C0044:1C

―  The electronically controlled brake unit detects that the supply voltage to the brake fluid pressure sensor is outside of the specification.

•  C0044:28

―  The electronically controlled brake unit detects that the offset amount of the brake fluid pressure signal (master cylinder side) is outside of the specification.

•  C0044:49

―  The electronically controlled brake unit detects any of the following conditions.

•  Brake fluid pressure sensor (master cylinder side) supply voltage malfunction

•  Brake fluid pressure sensor (master cylinder side) internal malfunction or poor functioning

•  C0044:54

―  The electronically controlled brake unit detects that the brake fluid pressure sensor initialization was not implemented.

•  C0044:56

―  The electronically controlled brake unit and brake fluid pressure sensor (master cylinder side) configuration information do not match.

•  C0044:64

―  The electronically controlled brake unit detects a non-conformity in any of the following signals.

•  Brake fluid pressure signals of 2 systems received from brake fluid pressure sensor (master cylinder side)

•  Brake fluid temperature signals of 2 systems received from brake fluid pressure sensor (master cylinder side)

•  C0044:84

―  The electronically controlled brake unit detects that the brake fluid pressure signal (master cylinder side) of 1 out of the 2 brake fluid pressure sensors is the specification or less.

•  C0044:85

―  The electronically controlled brake unit detects that the brake fluid pressure signal (master cylinder side) of 1 out of the 2 brake fluid pressure sensors is the specification or more.

Fail-safe

Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)

Possible cause

•  The initialization procedure for the brake fluid pressure sensor (master cylinder side) has not been performed.

•  Brake fluid pressure sensor (master cylinder side) malfunction

•  Open or short circuit in the brake fluid pressure sensor (master cylinder side) circuit in electronically controlled brake unit

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	DTC C0044:1C or C0044:54	Brake fluid pressure sensor
Detection condition	• C0044:1C ― The electronically controlled brake unit detects that the supply voltage to the brake fluid pressure sensor is outside of the specification. • C0044:28 ― The electronically controlled brake unit detects that the offset amount of the brake fluid pressure signal (master cylinder side) is outside of the specification. • C0044:49 ― The electronically controlled brake unit detects any of the following conditions. • Brake fluid pressure sensor (master cylinder side) supply voltage malfunction • Brake fluid pressure sensor (master cylinder side) internal malfunction or poor functioning • C0044:54 ― The electronically controlled brake unit detects that the brake fluid pressure sensor initialization was not implemented. • C0044:56 ― The electronically controlled brake unit and brake fluid pressure sensor (master cylinder side) configuration information do not match. • C0044:64 ― The electronically controlled brake unit detects a non-conformity in any of the following signals. • Brake fluid pressure signals of 2 systems received from brake fluid pressure sensor (master cylinder side) • Brake fluid temperature signals of 2 systems received from brake fluid pressure sensor (master cylinder side) • C0044:84 ― The electronically controlled brake unit detects that the brake fluid pressure signal (master cylinder side) of 1 out of the 2 brake fluid pressure sensors is the specification or less. • C0044:85 ― The electronically controlled brake unit detects that the brake fluid pressure signal (master cylinder side) of 1 out of the 2 brake fluid pressure sensors is the specification or more.
Fail-safe	Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
Possible cause	• The initialization procedure for the brake fluid pressure sensor (master cylinder side) has not been performed. • Brake fluid pressure sensor (master cylinder side) malfunction • Open or short circuit in the brake fluid pressure sensor (master cylinder side) circuit in electronically controlled brake unit
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY SENSOR INITIALIZATION PERFORMANCE CONDITION FOR DSC-RELATED PARTS

•  Has the sensor initialization for the DSC-related parts been performed?

Yes

Go to the next step.

No

Perform the sensor initialization for the DSC-related parts and perform repair completion verification.

(See DSC RELATED PARTS SENSOR INITIALIZATION PROCEDURE [(E)].)

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the electronically controlled brake unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the electronically controlled brake unit, then go to the next step.
(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].)

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

System malfunction location	DTC C0044:1C or C0044:54	Brake fluid pressure sensor
System malfunction location	DTC C0044:28, C0044:49, C0044:56, C0044:64, C0044:84 or C0044:85	Brake fluid pressure sensor (master cylinder side)
Detection condition	• C0044:1C ― The electronically controlled brake unit detects that the supply voltage to the brake fluid pressure sensor is outside of the specification. • C0044:28 ― The electronically controlled brake unit detects that the offset amount of the brake fluid pressure signal (master cylinder side) is outside of the specification. • C0044:49 ― The electronically controlled brake unit detects any of the following conditions. • Brake fluid pressure sensor (master cylinder side) supply voltage malfunction • Brake fluid pressure sensor (master cylinder side) internal malfunction or poor functioning • C0044:54 ― The electronically controlled brake unit detects that the brake fluid pressure sensor initialization was not implemented. • C0044:56 ― The electronically controlled brake unit and brake fluid pressure sensor (master cylinder side) configuration information do not match. • C0044:64 ― The electronically controlled brake unit detects a non-conformity in any of the following signals. • Brake fluid pressure signals of 2 systems received from brake fluid pressure sensor (master cylinder side) • Brake fluid temperature signals of 2 systems received from brake fluid pressure sensor (master cylinder side) • C0044:84 ― The electronically controlled brake unit detects that the brake fluid pressure signal (master cylinder side) of 1 out of the 2 brake fluid pressure sensors is the specification or less. • C0044:85 ― The electronically controlled brake unit detects that the brake fluid pressure signal (master cylinder side) of 1 out of the 2 brake fluid pressure sensors is the specification or more.
Fail-safe	Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
Possible cause	• The initialization procedure for the brake fluid pressure sensor (master cylinder side) has not been performed. • Brake fluid pressure sensor (master cylinder side) malfunction • Open or short circuit in the brake fluid pressure sensor (master cylinder side) circuit in electronically controlled brake unit
System wiring diagram	Not applicable
Connector diagram	Not applicable

Step	Inspection	Results	Action
1	VERIFY SENSOR INITIALIZATION PERFORMANCE CONDITION FOR DSC-RELATED PARTS • Has the sensor initialization for the DSC-related parts been performed?	Yes	Go to the next step.
1		No	Perform the sensor initialization for the DSC-related parts and perform repair completion verification. (See DSC RELATED PARTS SENSOR INITIALIZATION PROCEDURE [(E)].)
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the electronically controlled brake unit. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the electronically controlled brake unit, then go to the next step. (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.