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DTC C0049:85 [VEHICLE CONTROL MODULE (E)]

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Without Mazda M Hybrid

Outline

System malfunction location

Inappropriate brake fluid level

Detection condition

•  The vehicle control module (VCM) receives a brake fluid error signal from the DSC HU/CM for 10 s.

Fail-safe

(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)

Possible cause

•  DSC HU/CM malfunction

―  Brake fluid level malfunction

•  Brake fluid level sensor connector or terminals malfunction

•  Brake fluid level sensor malfunction

•  Vehicle control module (VCM) malfunction (built into body control module (BCM))

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Inappropriate brake fluid level
Detection condition	• The vehicle control module (VCM) receives a brake fluid error signal from the DSC HU/CM for 10 s.
Fail-safe	(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)
Possible cause	• DSC HU/CM malfunction ― Brake fluid level malfunction • Brake fluid level sensor connector or terminals malfunction • Brake fluid level sensor malfunction • Vehicle control module (VCM) malfunction (built into body control module (BCM))
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT VEHICLE CONTROL MODULE (VCM) AND BODY CONTROL MODULE (BCM) FOR MALFUNCTION

•  Perform the DTC inspection for the vehicle control module (VCM) and the body control module (BCM).
(See DTC INSPECTION.)

•  Is a DTC related to an internal malfunction of vehicle control module (VCM) or body control module (BCM) displayed ?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)

(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)

No

Go to the next step.

2

VERIFY BRAKE FLUID LEVEL

•  Inspect the brake fluid level.
(See BRAKE FLUID INSPECTION [(E)].)

•  Is the brake fluid level normal?

Yes

Go to the next step.

No

Add genuine brake fluid and perform the repair completion verification.

3

INSPECT BRAKE FLUID LEVEL SENSOR CONNECTOR FOR MALFUNCTION

•   Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT BRAKE FLUID LEVEL SENSOR FOR MALFUNCTION

•  Inspect the applicable part.
(See BRAKE FLUID LEVEL SENSOR INSPECTION [(E)].)

•  Is the part normal?

Yes

Go to the next step.

No

Replace the Master cylinder and perform the repair completion verification.

(See MASTER CYLINDER REMOVAL/INSTALLATION [L.H.D. (E)].)

(See MASTER CYLINDER REMOVAL/INSTALLATION [R.H.D.].)

5

INSPECT DSC HU/CM FOR MALFUNCTION

•  Perform the DTC inspection for the DSC HU/CM.
(See DTC INSPECTION.)

•  Is a DTC displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [DSC HU/CM (E)].)

No

Go to the next step.

6

INSPECT DSC HU/CM FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  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 vehicle control module (VCM).
(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, replace the DSC HU/CM and perform the repair completion verification.

(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].)

(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)

No

Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS].

(See TROUBLESHOOTING PROCEDURE [(E)].)

If DTC is displayed

•  Repeat the diagnosis from Step 1.

If DTC is not displayed

•  Go to repair completion verification 2.

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 vehicle control module (VCM).
(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 body control module (BCM), then go to the next step.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS DISPLAYED

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

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	INSPECT VEHICLE CONTROL MODULE (VCM) AND BODY CONTROL MODULE (BCM) FOR MALFUNCTION • Perform the DTC inspection for the vehicle control module (VCM) and the body control module (BCM). (See DTC INSPECTION.) • Is a DTC related to an internal malfunction of vehicle control module (VCM) or body control module (BCM) displayed ?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [VEHICLE CONTROL MODULE (E)].) (See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
No	Go to the next step.
2	VERIFY BRAKE FLUID LEVEL • Inspect the brake fluid level. (See BRAKE FLUID INSPECTION [(E)].) • Is the brake fluid level normal?	Yes	Go to the next step.
No	Add genuine brake fluid and perform the repair completion verification.
3	INSPECT BRAKE FLUID LEVEL SENSOR CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT BRAKE FLUID LEVEL SENSOR FOR MALFUNCTION • Inspect the applicable part. (See BRAKE FLUID LEVEL SENSOR INSPECTION [(E)].) • Is the part normal?	Yes	Go to the next step.
No	Replace the Master cylinder and perform the repair completion verification. (See MASTER CYLINDER REMOVAL/INSTALLATION [L.H.D. (E)].) (See MASTER CYLINDER REMOVAL/INSTALLATION [R.H.D.].)
5	INSPECT DSC HU/CM FOR MALFUNCTION • Perform the DTC inspection for the DSC HU/CM. (See DTC INSPECTION.) • Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [DSC HU/CM (E)].)
No	Go to the next step.
6	INSPECT DSC HU/CM FOR MALFUNCTION DEPENDING ON REPEATABILITY • 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 vehicle control module (VCM). (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, replace the DSC HU/CM and perform the repair completion verification. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
No	Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS]. (See TROUBLESHOOTING PROCEDURE [(E)].) If DTC is displayed • Repeat the diagnosis from Step 1. If DTC is not displayed • Go to repair completion verification 2.
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 vehicle control module (VCM). (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 body control module (BCM), then go to the next step. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)
No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

With Mazda M Hybrid

Outline

System malfunction location

Inappropriate brake fluid level

Detection condition

•  The vehicle control module (VCM) receives a brake fluid error signal from the electronically controlled brake unit for 10 s.

Fail-safe

(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)

Possible cause

•  Electronically controlled brake unit malfunction

―  Brake fluid level malfunction

•  Brake fluid level sensor connector or terminals malfunction

•  Brake fluid level sensor malfunction

•  Vehicle control module (VCM) malfunction (built into body control module (BCM))

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Inappropriate brake fluid level
Detection condition	• The vehicle control module (VCM) receives a brake fluid error signal from the electronically controlled brake unit for 10 s.
Fail-safe	(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)
Possible cause	• Electronically controlled brake unit malfunction ― Brake fluid level malfunction • Brake fluid level sensor connector or terminals malfunction • Brake fluid level sensor malfunction • Vehicle control module (VCM) malfunction (built into body control module (BCM))
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT VEHICLE CONTROL MODULE (VCM) AND BODY CONTROL MODULE (BCM) FOR MALFUNCTION

•  Perform the DTC inspection for the vehicle control module (VCM) and the body control module (BCM).
(See DTC INSPECTION.)

•  Is a DTC related to an internal malfunction of vehicle control module (VCM) or body control module (BCM) displayed ?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [VEHICLE CONTROL MODULE (E)].)

(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)

No

Go to the next step.

2

VERIFY BRAKE FLUID LEVEL

•  Inspect the brake fluid level.
(See BRAKE FLUID INSPECTION [(E)].)

•  Is the brake fluid level normal?

Yes

Go to the next step.

No

Add genuine brake fluid and perform the repair completion verification.

3

INSPECT BRAKE FLUID LEVEL SENSOR CONNECTOR FOR MALFUNCTION

•   Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT BRAKE FLUID LEVEL SENSOR FOR MALFUNCTION

•  Inspect the applicable part.
(See BRAKE FLUID LEVEL SENSOR INSPECTION [(E)].)

•  Is the part normal?

Yes

Go to the next step.

No

Replace the Electronically controlled brake unit and perform the repair completion verification.

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

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

5

INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR MALFUNCTION

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

•  Is a DTC displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)

No

Go to the next step.

6

INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  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 vehicle control module (VCM).
(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, replace the electronically controlled brake unit and perform the repair completion verification.

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

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

No

Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS].

(See TROUBLESHOOTING PROCEDURE [(E)].)

If DTC is displayed

•  Repeat the diagnosis from Step 1.

If DTC is not displayed

•  Go to repair completion verification 2.

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 vehicle control module (VCM).
(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 body control module (BCM), then go to the next step.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS DISPLAYED

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

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.