DTC U0301:09 [VEHICLE CONTROL MODULE (V/C-MODULE)]

id0102i0002300

System malfunction location

Error signal received from PCM

Detection condition

•  There is an error in the following signals sent from the PCM.

―  Brake switch signal

―  Cruise control system control signal

Fail-safe

•  Inhibits the mazda radar cruise control (MRCC) system control

•  Inhibits the smart brake support (SBS) system control^*1

•  Inhibits the distance recognition support system (DRSS) control^*1

^*1: Enabled depending on malfunction content.

Possible cause

•  PCM malfunction

•  DSC HU/CM malfunction

•  Vehicle control module (V/C-module) malfunction

System wiring diagram

•  Not applicable

System malfunction location	Error signal received from PCM
Detection condition	• There is an error in the following signals sent from the PCM. ― Brake switch signal ― Cruise control system control signal
Fail-safe	• Inhibits the mazda radar cruise control (MRCC) system control • Inhibits the smart brake support (SBS) system control^1 • Inhibits the distance recognition support system (DRSS) control^1 ^*1: Enabled depending on malfunction content.
Possible cause	• PCM malfunction • DSC HU/CM malfunction • Vehicle control module (V/C-module) malfunction
System wiring diagram	• Not applicable

Diagnostic Procedure

Step

Inspection

Action

1

PERFORM DTC INSPECTION FOR PCM

•  Perform the PCM DTC inspection using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

(See DTC TABLE [SKYACTIV-D 2.2].)

Then go to Step 4.

No

Go to the next step.

2

PERFORM DTC INSPECTION FOR DSC HU/CM

•  Perform the DSC HU/CM DTC inspection using the M-MDS.
(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

Then go to Step 4.

No

Go to the next step.

3

PERFORM DTC INSPECTION FOR VEHICLE CONTROL MODULE (V/C-MODULE)

•  Clear vehicle control module (V/C-module) DTCs using the M-MDS.
(See CLEARING DTC [VEHICLE CONTROL MODULE (V/C-MODULE)].)

•  Switch the ignition ON (engine on).

•  Perform the vehicle control module (V/C-module) DTC inspection using the M-MDS.
(See DTC INSPECTION [VEHICLE CONTROL MODULE (V/C-MODULE)].)

•  Is the same DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

No

Go to the next step.

4

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

•  Clear vehicle control module (V/C-module) DTCs using the M-MDS.
(See CLEARING DTC [VEHICLE CONTROL MODULE (V/C-MODULE)].)

•  Switch the ignition ON (engine on).

•  Perform the vehicle control module (V/C-module) DTC inspection using the M-MDS.
(See DTC INSPECTION [VEHICLE CONTROL MODULE (V/C-MODULE)].)

•  Is the same DTC present?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the vehicle control module (V/C-module).
(See VEHICLE CONTROL MODULE (V/C-MODULE) REMOVAL/INSTALLATION [MAZDA RADAR CRUISE CONTROL (MRCC) SYSTEM].)

Go to the next step.

No

Go to the next step.

5

VERIFY THAT NO OTHER DTCs ARE PRESENT

•  Verify other DTCs displayed.

•  Are any other DTCs output?

Yes

Perform the corresponding DTC inspection.

No

DTC troubleshooting completed.

Step	Inspection		Action
1	PERFORM DTC INSPECTION FOR PCM • Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DTC TABLE [SKYACTIV-D 2.2].) Then go to Step 4.
1		No	Go to the next step.
2	PERFORM DTC INSPECTION FOR DSC HU/CM • Perform the DSC HU/CM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) Then go to Step 4.
2		No	Go to the next step.
3	PERFORM DTC INSPECTION FOR VEHICLE CONTROL MODULE (V/C-MODULE) • Clear vehicle control module (V/C-module) DTCs using the M-MDS. (See CLEARING DTC [VEHICLE CONTROL MODULE (V/C-MODULE)].) • Switch the ignition ON (engine on). • Perform the vehicle control module (V/C-module) DTC inspection using the M-MDS. (See DTC INSPECTION [VEHICLE CONTROL MODULE (V/C-MODULE)].) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
3		No	Go to the next step.
4	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Clear vehicle control module (V/C-module) DTCs using the M-MDS. (See CLEARING DTC [VEHICLE CONTROL MODULE (V/C-MODULE)].) • Switch the ignition ON (engine on). • Perform the vehicle control module (V/C-module) DTC inspection using the M-MDS. (See DTC INSPECTION [VEHICLE CONTROL MODULE (V/C-MODULE)].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the vehicle control module (V/C-module). (See VEHICLE CONTROL MODULE (V/C-MODULE) REMOVAL/INSTALLATION [MAZDA RADAR CRUISE CONTROL (MRCC) SYSTEM].) Go to the next step.
4		No	Go to the next step.
5	VERIFY THAT NO OTHER DTCs ARE PRESENT • Verify other DTCs displayed. • Are any other DTCs output?	Yes	Perform the corresponding DTC inspection.
5		No	DTC troubleshooting completed.