DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.1) [(E)]

id1002x2001700

Caution

• Perform the following malfunction diagnosis only when it is diagnosed with a open circuit by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

• If the malfunctioning part is detected in the communication line, before disconnecting the related connector for inspection, press the connector in the connection direction to verify that there is no looseness or disconnection.

• When disconnecting the connector, verify that there is no damage, deformation, or corrosion of the connector terminals.

1. Verify the CAN system-related module DTCs and the module displayed in red or blue on the M-MDS screen.

2. Apply the communication error DTC and the module displayed in red or blue to the DTC output pattern and malfunctioning location, and select the possible cause for the diagnostic result and the reference for the inspection item. (See DTC Output Pattern And Malfunctioning Location)

Note

• The open circuit location can be determined by the DTC indicated in the DTC output pattern and malfunctioning location chart. DTCs not listed in the chart are not used for the determination of the open circuit location. (See DTC Output Pattern And Malfunctioning Location.)

• The module may be displayed in red or blue on the M-MDS screen even if there is no malfunction depending on the vehicle specification.

3. Inspect the possible cause and inspection item of the applicable malfunctioning part.

DTC Output Pattern And Malfunctioning Location

Cross (×): Communication error-related DTC

M-MDS display	DTC	DTC output pattern and malfunctioning location
DTC output module	DTC	DTC output pattern and malfunctioning location
PCM [SKYACTIV-G]	U0100:00	×
	U0121:00				×
	U0129:00
	U0131:00									×
	U0140:00
	U0151:00						×
	U0155:00
	U0164:00
	U2121:00
	U212E:00
	U2131:00
	U2133:00
PCM [SKYACTIV-X]	U0100:00	×
	U0121:00				×
	U0129:00
	U0131:00									×
	U0140:00
	U0151:00						×
	U0155:00
	U0164:00
	U2121:00
	U212E:00
	U2131:00
	U2133:00
PCM [SKYACTIV-D]	U0101:00		×
	U0121:00				×
	U0131:00									×
	U0140:00
	U0151:00						×
	U0155:00
	U0164:00
	U029D:00
	U02A3:00
	U2121:00
	U212E:00
	U2131:00
	U2133:00
DSC HU/CM	U0100:00	×		×
	U0101:00		×	×
	U0131:00									×
	U0140:00
	U0151:00						×
	U0155:00
	U0164:00
	U2121:00
	U212E:00
	U2131:00
EPS control module	U0100:00	×		×		×		×
	U0121:00				×	×		×
	U0140:00										×
	U2121:00
Electronically controlled brake unit	U0100:00	×		×		×		×			×
	U0101:00		×	×		×		×			×
	U0131:00									×	×
	U0140:00										×
	U0151:00						×	×			×
	U0155:00
	U0164:00
	U2121:00
	U212E:00
	U2131:00
Vehicle control module (VCM)	U0100:00	×		×		×		×			×
	U0101:00		×	×		×		×			×
	U0121:00				×	×		×			×
	U0126:00
	U0131:00									×	×
	U0140:00										×
	U0151:00						×	×			×
	U0155:00
	U0156:00
	U0164:00
	U2120:00
	U2122:00
	U2123:00
	U2125:00
	U2126:00
	U212E:00
	U2131:00
	U2132:00
	U2133:00
	U2139:00
	U213A:00
Body control module (BCM)	U0100:00	×		×		×		×
	U0101:00		×	×		×		×
	U0111:00
	U0115:00	×		×		×		×
	U0120:00
	U0121:00				×	×		×
	U0121:87				×	×		×
	U0126:00
	U0131:00									×
	U0151:00						×	×
	U0155:00
	U0156:00
	U0158:00
	U0164:00
	U0182:00								×
	U0198:00
	U029D:00
	U02A3:00
	U2121:49
	U212A:00
	U212C:00
	U212D:00
	U212E:00
	U2130:00
	U2131:00
	U2133:00
	U213A:00
	U213B:00
	U213C:00				×	×		×
Connectivity master unit (CMU)^1/Audio control unit(ACU)^2	U0140:00
Emergency call control module	U0140:00
	U0151:00						×	×			×
	U0415:86				×	×		×
	U213C:00				×	×		×
Adaptive front lighting system (AFS) control module	U0122:87				×	×		×
	U0126:87
	U212A:87
	U212B:87
	U212D:87
Auto leveling control module	U0122:87				×	×		×
	U212A:87
	U212B:87
	U212D:87
Adaptive LED headlights control module	U0122:87				×	×		×
	U0126:87
	U0155:87
	U2121:87
	U212A:87
	U212B:87
	U212D:87
Dash-electrical supply unit	B2009:92	×		×		×		×			×
	U0100:00	×		×		×		×			×
	U0121:00				×	×		×			×
	U0151:00						×	×			×
	U212B:00
	U212E:00
	U2131:00
	U2133:00
	U213A:00
SAS control module	U0140:00										×
	U0155:00
	U0156:00
TCM [CW6A-EL,CW6AX-EL]	U0100:00	×
	U0121:00				×
	U0131:00									×
	U0140:00
	U0155:00
	U212C:00
TCM [ET6A-EL, ET6AX-EL]	U0100:00	×
	U0121:00				×
	U0131:00									×
	U0140:00
	U0155:00
	U212C:00
TCM [EV6A-EL, EV6AX-EL]	U0100:00	×
	U0121:00				×
	U0131:00									×
	U0140:00
	U0155:00
	U212C:00
Integrated starter generator (ISG)	U0100:00	×		×		×		×			×
Mazda M Hybrid battery	U0100:00	×		×		×		×			×
DC-DC converter (Mazda M Hybrid)	U0100:00	×		×		×		×			×
DC-DC converter (Mazda M Hybrid)	U212B:00
M-MDS display module		Module displayed in red or blue
PCM		×		×		×		×			×
TCM			×	×		×		×			×
DSC HU/CM / electronically controlled brake unit					×	×		×			×
SAS control module							×	×			×
AFS control module / auto leveling control module / adaptive LED headlights control module									×		×
EPS control module										×	×
Diagnostic result
Possible cause and inspection item		A	B	C	D	E	F	G	H	I	J

*1 :Except Chinese specs.

*2 :Chinese specs.

SKYACTIV-G or SKYACTIV-X (ATX)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• PCM power supply voltage or body ground malfunction

• Open circuit in wiring harness between PCM and connector C-01

• Open circuit in wiring harness between connector C-01 and connector C-38

• Connector C-01 malfunction

• Connector C-38 malfunction

• PCM malfunction

System wiring diagram

am3zzw00030254

Inspection item

• PCM power supply voltage-related wiring harness and fuse

• PCM body ground related wiring harness

• PCM connector

• Connector C-01

• Connector C-38

• Wiring harness between PCM terminal 2S and connector C-01

• Wiring harness between PCM terminal 2T and connector C-01

• Wiring harness between connector C-01 and connector C-38

• PCM

SKYACTIV-G or SKYACTIV-X (MTX) (with connectors C-37, C-36)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• PCM power supply voltage or body ground malfunction

• Open circuit in wiring harness between PCM and connector C-01

• Open circuit in wiring harness between connector C-01 and connector C-02

• Open circuit in wiring harness between connector C-02 and connectors C-37, C-36

• Connector C-01 malfunction

• Connector C-02 malfunction

• Connectors C-37, C-36 malfunction

• PCM malfunction

System wiring diagram

am3zzw00030255

Inspection item

• PCM power supply voltage-related wiring harness and fuse

• PCM body ground related wiring harness

• PCM connector

• Connector C-01

• Connector C-02

• Connectors C-37, C-36

• Wiring harness between PCM terminal 2S and connector C-01

• Wiring harness between PCM terminal 2T and connector C-01

• Wiring harness between connector C-01 and connector C-02

• Wiring harness between connector C-02 and connectors C-37, C-36

• PCM

SKYACTIV-G or SKYACTIV-X (MTX) (without connectors C-37, C-36)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• PCM power supply voltage or body ground malfunction

• Open circuit in wiring harness between PCM and connector C-01

• Open circuit in wiring harness between connector C-01 and connector C-02

• Open circuit in wiring harness between connector C-02 and branch A

• Connector C-01 malfunction

• Connector C-02 malfunction

• PCM malfunction

System wiring diagram

am3zzw00030256

Inspection item

• PCM power supply voltage-related wiring harness and fuse

• PCM body ground related wiring harness

• PCM connector

• Connector C-01

• Connector C-02

• Wiring harness between PCM terminal 2S and connector C-01

• Wiring harness between PCM terminal 2T and connector C-01

• Wiring harness between connector C-01 and connector C-02

• Wiring harness between connector C-02 and branch A

• PCM

SKYACTIV-D 1.8 (MTX) (with connectors C-37, C-36)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• PCM power supply voltage or body ground malfunction

• Open circuit in wiring harness between PCM and connector C-01

• Open circuit in wiring harness between connector C-01 and connector C-02

• Open circuit in wiring harness between connector C-02 and connectors C-37, C-36

• Connector C-01 malfunction

• Connector C-02 malfunction

• Connectors C-37, C-36 malfunction

• PCM malfunction

System wiring diagram

am3zzw00030257

Inspection item

• PCM power supply voltage-related wiring harness and fuse

• PCM body ground related wiring harness

• PCM connector

• Connector C-01

• Connector C-02

• Connectors C-37, C-36

• Wiring harness between PCM terminal 1AK and connector C-01

• Wiring harness between PCM terminal 1AL and connector C-01

• Wiring harness between connector C-01 and connector C-02

• Wiring harness between connector C-02 and connectors C-37, C-36

• PCM

SKYACTIV-D 1.8 (MTX) (without connectors C-37, C-36)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• PCM power supply voltage or body ground malfunction

• Open circuit in wiring harness between PCM and connector C-01

• Open circuit in wiring harness between connector C-01 and connector C-02

• Open circuit in wiring harness between connector C-02 and branch A

• Connector C-01 malfunction

• Connector C-02 malfunction

• PCM malfunction

System wiring diagram

am3zzw00030258

Inspection item

• PCM power supply voltage-related wiring harness and fuse

• PCM body ground related wiring harness

• PCM connector

• Connector C-01

• Connector C-02

• Wiring harness between PCM terminal 1AK and connector C-01

• Wiring harness between PCM terminal 1AL and connector C-01

• Wiring harness between connector C-01 and connector C-02

• Wiring harness between connector C-02 and branch A

• PCM

SKYACTIV-D 1.8 (ATX) (with connectors C-37, C-36)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• PCM power supply voltage or body ground malfunction

• Open circuit in wiring harness between PCM and connectors C-37, C-36

• Connectors C-37, C-36 malfunction

• PCM malfunction

System wiring diagram

am3zzw00030259

Inspection item

• PCM power supply voltage-related wiring harness and fuse

• PCM body ground related wiring harness

• PCM connector

• Connectors C-37, C-36

• Wiring harness between PCM terminal 1AK and connectors C-37, C-36

• Wiring harness between PCM terminal 1AL and connectors C-37, C-36

• PCM

SKYACTIV-D 1.8 (ATX) (without connectors C-37, C-36)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• PCM power supply voltage or body ground malfunction

• Open circuit in wiring harness between PCM and branch A

• PCM malfunction

System wiring diagram

am3zzw00030260

Inspection item

• PCM power supply voltage-related wiring harness and fuse

• PCM body ground related wiring harness

• PCM connector

• Wiring harness between PCM terminal 1AK and branch A

• Wiring harness between PCM terminal 1AL and branch A

• PCM

SKYACTIV-G or SKYACTIV-X (ATX)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• TCM power supply voltage or body ground malfunction

• Open circuit in wiring harness between TCM and connector C-38

• Connector C-38 malfunction

• TCM malfunction

System wiring diagram

am3zzw00030261

Inspection item

• TCM power supply voltage-related wiring harness and fuse

• TCM body ground related wiring harness

• TCM connector

• Connector C-38

• Wiring harness between TCM terminal E and connector C-38

• Wiring harness between TCM terminal F and connector C-38

• TCM

SKYACTIV-D 1.8 (ATX)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• TCM power supply voltage or body ground malfunction

• Open circuit in wiring harness between TCM and connector C-02

• Open circuit in wiring harness between connector C-02 and branch A

• Connector C-02 malfunction

• TCM malfunction

System wiring diagram

am3zzw00030262

Inspection item

• TCM power supply voltage-related wiring harness and fuse

• TCM body ground related wiring harness

• TCM connector

• Connector C-02

• Wiring harness between TCM terminal E and connector C-02

• Wiring harness between TCM terminal F and connector C-02

• Wiring harness between connector C-02 and branch A

• TCM

SKYACTIV-G or SKYACTIV-X (ATX) (with connectors C-37, C-36)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connector C-38 and connector C-02

• Open circuit in wiring harness between connector C-02 and connectors C-37,C-36

• Connector C-38 malfunction

• Connector C-02 malfunction

• Connectors C-37, C-36 malfunction

System wiring diagram

am3zzw00030263

Inspection item

• Wiring harness between connector C-38 and connector C-02

• Wiring harness between connector C-02 and connectors C-37, C-36

• Connector C-38

• Connector C-02

• Connectors C-37, C-36

SKYACTIV-G or SKYACTIV-X (ATX) (without connectors C-37, C-36)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connector C-38 and connector C-02

• Open circuit in wiring harness between connector C-02 and branch A

• Connector C-38 malfunction

• Connector C-02 malfunction

System wiring diagram

am3zzw00030264

Inspection item

• Wiring harness between connector C-38 and connector C-02

• Wiring harness between connector C-02 and branch A

• Connector C-38

• Connector C-02

With connectors C-37, C-36

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• DSC HU/CM / electronically controlled brake unit power supply voltage or body ground malfunction

• Open circuit in wiring harness between DSC HU/CM / electronically controlled brake unit and connectors C-37, C-36

• Connectors C-37, C-36 malfunction

• DSC HU/CM / electronically controlled brake unit malfunction

System wiring diagram

am3zzw00030265

Inspection item

• DSC HU/CM / electronically controlled brake unit power supply voltage-related wiring harness and fuse

• DSC HU/CM / electronically controlled brake unit body ground related wiring harness

• DSC HU/CM / electronically controlled brake unit connector

• Connectors C-37, C-36

• Wiring harness between electronically controlled brake unit terminal 1AM and connectors C-37, C-36 (with Mazda M Hybrid)

• Wiring harness between electronically controlled brake unit terminal 1AO and connectors C-37, C-36 (with Mazda M Hybrid)

• Wiring harness between DSC HU/CM terminal L and connectors C-37, C-36 (without Mazda M Hybrid)

• Wiring harness between DSC HU/CM terminal J and connectors C-37, C-36 (without Mazda M Hybrid)

• DSC HU/CM / electronically controlled brake unit

Without connectors C-37, C-36

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• DSC HU/CM / electronically controlled brake unit power supply voltage or body ground malfunction

• Open circuit in wiring harness between DSC HU/CM / electronically controlled brake unit and branch B

• DSC HU/CM / electronically controlled brake unit malfunction

System wiring diagram

am3zzw00030266

Inspection item

• DSC HU/CM / electronically controlled brake unit power supply voltage-related wiring harness and fuse

• DSC HU/CM / electronically controlled brake unit body ground related wiring harness

• DSC HU/CM / electronically controlled brake unit connector

• Wiring harness between electronically controlled brake unit terminal 1AM and branch B (with Mazda M Hybrid)

• Wiring harness between electronically controlled brake unit terminal 1AO and branch B (with Mazda M Hybrid)

• Wiring harness between DSC HU/CM terminal L and branch B (without Mazda M Hybrid)

• Wiring harness between DSC HU/CM terminal J and branch B (without Mazda M Hybrid)

• DSC HU/CM / electronically controlled brake unit

SKYACTIV-G or SKYACTIV-X (MTX) (with connectors C-37, C-36)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connectors C-55, C-56 and connector C-21

• Open circuit in wiring harness between connector C-21 and connector C-07

• Open circuit in wiring harness between connector C-07 and connectors C-37, C-36

• Connectors C-55, C-56 malfunction

• Connector C-21 malfunction

• Connector C-07 malfunction

• Connectors C-37, C-36 malfunction

System wiring diagram

am3zzw00030267

Inspection item

• Wiring harness between connectors C-55, C-56 and connector C-21

• Wiring harness between connector C-21 and connector C-07

• Wiring harness between connector C-07 and connectors C-37, C-36

• Connectors C-55, C-56

• Connector C-07

• Connector C-21

• Connectors C-37, C-36

SKYACTIV-G or SKYACTIV-X (MTX) (without connectors C-37, C-36)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connectors C-55, C-56 and connector C-21

• Open circuit in wiring harness between connector C-21 and connector C-07

• Open circuit in wiring harness between connector C-07 and branch A

• Connectors C-55, C-56 malfunction

• Connector C-21 malfunction

• Connector C-07 malfunction

System wiring diagram

am3zzw00030268

Inspection item

• Wiring harness between connectors C-55, C-56 and connector C-21

• Wiring harness between connector C-21 and connector C-07

• Wiring harness between connector C-21 and branch A

• Connectors C-55, C-56

• Connector C-07

• Connector C-21

SKYACTIV-D 1.8 (ATX)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connectors C-55, C-56 and connector C-21

• Open circuit in wiring harness between connector C-21 and connector C-07

• Open circuit in wiring harness between connector C-07 and branch A

• Connectors C-55, C-56 malfunction

• Connector C-21 malfunction

• Connector C-07 malfunction

System wiring diagram

am3zzw00030269

Inspection item

• Wiring harness between connectors C-55, C-56 and connector C-21

• Wiring harness between connector C-21 and connector C-07

• Wiring harness between connector C-21 and branch A

• Connectors C-55, C-56

• Connector C-07

• Connector C-21

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• SAS control module power supply voltage or body ground malfunction

• Open circuit in wiring harness between SAS control module and connectors C-55, C-56

• Connectors C-55, C-56 malfunction

• SAS control module malfunction

System wiring diagram

am3zzw00030270

Inspection item

• SAS control module power supply voltage-related wiring harness and fuse

• SAS control module body ground related wiring harness

• SAS control module connector

• Connectors C-55, C-56

• Wiring harness between SAS control module terminal 3A and connectors C-55, C-56

• Wiring harness between SAS control module terminal 3D and connectors C-55, C-56

• SAS control module

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connector C-40 and connector C-13

• Open circuit in wiring harness between connector C-13 and connector C-21

• Open circuit in wiring harness between connector C-21 and connectors C-55, C-56

• Connector C-40 malfunction

• Connector C-13 malfunction

• Connector C-21 malfunction

• Connectors C-55, C-56 malfunction

System wiring diagram

am3zzw00030271

Inspection item

• Connector C-40

• Connector C-13

• Connector C-21

• Connectors C-55,C-56

• Wiring harness between connector C-40 and connector C-13

• Wiring harness between connector C-13 and connector C-21

• Wiring harness between connector C-21 and connectors C-55,C-56

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• AFS control module / auto leveling control module power supply voltage or body ground malfunction (without adaptive LED headlights)

• Adaptive LED headlights control module power supply voltage or body ground malfunction (with adaptive LED headlights)

• Open circuit in wiring harness between AFS control module / auto leveling control module and connector C-40 (without adaptive LED headlights)

• Open circuit in wiring harness between adaptive LED headlights control module and connector C-40 (with adaptive LED headlights)

• Connector C-40 malfunction

• AFS control module / auto leveling control module malfunction (without adaptive LED headlights)

• Adaptive LED headlights control module malfunction (with adaptive LED headlights)

System wiring diagram

am3zzw00030272

Inspection item

• AFS control module / auto leveling control module power supply voltage-related wiring harness and fuse (without adaptive LED headlights)

• Adaptive LED headlights control module power supply voltage-related wiring harness and fuse (with adaptive LED headlights)

• AFS control module / auto leveling control module body ground related wiring harness (without adaptive LED headlights)

• Adaptive LED headlights control module body ground related wiring harness (with adaptive LED headlights)

• AFS control module / auto leveling control module connector (without adaptive LED headlights)

• Adaptive LED headlights control module connector (with adaptive LED headlights)

• Connector C-40

• Wiring harness between AFS control module / auto leveling control module terminal I and connector C-40 (without adaptive LED headlights)

• Wiring harness between adaptive LED headlights control module terminal J and connector C-40 (without adaptive LED headlights)

• Wiring harness between adaptive LED headlights control module terminal I and connector C-40 (with adaptive LED headlights)

• Wiring harness between adaptive LED headlights control module terminal J and connector C-40 (with adaptive LED headlights)

• AFS control module / auto leveling control module (without adaptive LED headlights)

• Adaptive LED headlights control module (with adaptive LED headlights)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• EPS control module power supply voltage or body ground malfunction

• Open circuit in wiring harness between EPS control module and connector C-40

• Connector C-40 malfunction

• EPS control module malfunction

System wiring diagram

am3zzw00030273

Inspection item

• EPS control module power supply voltage-related wiring harness and fuse

• EPS control module body ground related wiring harness

• EPS control module connector

• Connector C-40

• Wiring harness between EPS control module terminal 2C and connector C-40

• Wiring harness between EPS control module terminal 2A and connector C-40

• EPS control module

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Body control module (BCM) power supply voltage or body ground malfunction

• Open circuit in wiring harness between body control module (BCM) and connector C-40

• Connector C-40 malfunction

• Body control module (BCM) malfunction

System wiring diagram

am3zzw00030274

Inspection item

• Body control module (BCM) power supply voltage-related wiring harness and fuse

• Body control module (BCM) body ground related wiring harness

• Body control module (BCM) connector

• Connector C-40

• Wiring harness between body control module (BCM) terminal 3X and connector C-40

• Wiring harness between body control module (BCM) terminal 3W and connector C-40

• Body control module (BCM)