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

id100200001700

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.)

• 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	U0100:00
	U0103:00												×
	U0121:00						×
	U0129:00						×
	U0131:00													×
	U0140:00														×
	U0151:00								×
	U0155:00
	U0164:00
	U01BA:00		×
	U0291:00												×
	U102D:00		×
	U2121:00
	U212E:00
	U2131:00
	U2133:00
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				×	×		×		×		×			×
	U0103:00												×
	U0103:87												×
	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										×	×			×
	U01BA:00		×
	U0316:82
	U2121:49
	U212A:00
	U212D:00
	U212E:00
	U2130:00
	U2131:00
	U2133:00
	U213A:00
	U213B:00
	U213C:00						×	×		×		×			×
Connectivity master unit (CMU)	U0101:00				×	×		×		×		×			×
	U0131:00													×	×
	U0140:00														×
	U0151:00								×	×		×			×
	U0155:00
	U2121:00
	U213C:00						×	×		×		×			×
	U213E:00	×		×		×		×		×		×			×
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	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 [ET6A-EL, ET6AX-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														×
Selector lever	U0100:00	×		×		×		×		×		×
	U0101:00				×	×		×		×		×
	U0121:00						×	×		×		×
	U0140:00														×
	U212B:00														×
Parking lock actuator	U0100:00	×
	U0115:00	×
	U0100:41	×
	U0100:82	×
M-MDS display module		Module displayed in red or blue
PCM		×		×		×		×		×		×			×
Parking lock actuator			×	×		×		×		×		×			×
TCM					×	×		×		×		×			×
Electronically controlled brake unit							×	×		×		×			×
SAS control module									×	×		×			×
Auto leveling control module / adaptive LED headlights control module											×	×			×
Selector lever													×		×
EPS control module														×	×
Body control module (BCM)															×
Diagnostic result
Possible cause and inspection item		A	B	C	D	E	F	G	H	I	J	K	L	M	N

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-44

• Connector C-01 malfunction

• Connector C-44 malfunction

• PCM malfunction

System wiring diagram

a30zzw00005411

Inspection item

• PCM power supply voltage-related wiring harness and fuse

• PCM body ground related wiring harness

• PCM connector

• Connector C-01

• Connector C-44

• 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-44

• PCM

Possible cause

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

• Parking lock actuator power supply voltage or body ground malfunction

• Open circuit in wiring harness between parking lock actuator and connector C-44

• Connector C-44 malfunction

• Parking lock actuator malfunction

System wiring diagram

a30zzw00005412

Inspection item

• Parking lock actuator power supply voltage-related wiring harness and fuse

• Parking lock actuator body ground related wiring harness

• Parking lock actuator connector

• Connector C-44

• Wiring harness between parking lock actuator terminal E and connector C-44

• Wiring harness between parking lock actuator terminal F and connector C-44

• Parking lock actuator

Possible cause

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

• Open circuit in wiring harness between connector C-44 and connector C-02

• Connector C-44 malfunction

• Connector C-02 malfunction

System wiring diagram

a30zzw00005413

Inspection item

• Wiring harness between connector C-44 and connector C-02

• Connector C-44

• Connector C-02

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

• Connector C-02 malfunction

• TCM malfunction

System wiring diagram

a30zzw00005414

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

• TCM

Possible cause

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

• Open circuit in wiring harness between connector C-02 and connector C-34

• Open circuit in wiring harness between connector C-34 and branch A

• Connector C-02 malfunction

• Connector C-34 malfunction

System wiring diagram

a30zzw00005415

Inspection item

• Connector C-02

• Connector C-34

• Wiring harness between connector C-02 and connector C-34

• Wiring harness between connector C-34 and branch A

Possible cause

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

• Electronically controlled brake unit power supply voltage or body ground malfunction

• Open circuit in wiring harness between electronically controlled brake unit and branch A

• Electronically controlled brake unit malfunction

System wiring diagram

a30zzw00005416

Inspection item

• Electronically controlled brake unit power supply voltage-related wiring harness and fuse

• Electronically controlled brake unit body ground related wiring harness

• Electronically controlled brake unit connector

• Wiring harness between electronically controlled brake unit terminal 1AM and connector branch A

• Wiring harness between electronically controlled brake unit terminal 1AO and connector branch A

• Electronically controlled brake unit

Possible cause

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

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

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

• Open circuit in wiring harness between connector C-21 and connectors C-71, C-72

• Connector C-07 malfunction

• Connector C-21 malfunction

• Connectors C-71, C-72 malfunction

System wiring diagram

a30zzw00005417

Inspection item

• Connector C-07

• Connector C-21

• Connectors C-71, C-72

• Wiring harness between branch A and connector C-07

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

• Wiring harness between connector C-21 and connectors C-71, C-72

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-71, C-72

• Connectors C-71, C-72 malfunction

• SAS control module malfunction

System wiring diagram

a30zzw00005418

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-71, C-72

• Wiring harness between SAS control module terminal 3A and connector C-71

• Wiring harness between SAS control module terminal 3D and connector C-72

• SAS control module

Possible cause

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

• Open circuit in wiring harness between connectors C-71, C-72 and connector C-21

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

• Open circuit in wiring harness between connector C-13 and connector C-38

• Connectors C-71, C-72 malfunction

• Connector C-21 malfunction

• Connector C-13 malfunction

• Connector C-38 malfunction

System wiring diagram

a30zzw00005419

Inspection item

• Connectors C-71, C-72

• Connector C-21

• Connector C-13

• Connector C-38

• Wiring harness between connector C-21 and connectors C-71, C-72

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

• Wiring harness between connector C-13 and connector C-38

Possible cause

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

• Auto leveling control module / adaptive LED headlights control module power supply voltage or body ground malfunction

• Open circuit in wiring harness between auto leveling control module / adaptive LED headlights control module and connector C-38

• Connector C-38 malfunction

• Auto leveling control module / adaptive LED headlights control module malfunction

System wiring diagram

a30zzw00005420

Inspection item

• Auto leveling control module / adaptive LED headlights control module power supply voltage-related wiring harness and fuse

• Auto leveling control module / adaptive LED headlights control module body ground related wiring harness

• Auto leveling control module / adaptive LED headlights control module connector

• Connector C-38

• Wiring harness between auto leveling control module / adaptive LED headlights control module terminal E and connector C-38

• Wiring harness between auto leveling control module / adaptive LED headlights control module terminal H and connector C-38

• Auto leveling control module / adaptive LED headlights control module

Possible cause

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

• Open circuit in wiring harness between connector C-38 and connector C-39

• Connector C-38 malfunction

• Connector C-39 malfunction

System wiring diagram

a30zzw00005421

Inspection item

• Connector C-38

• Connector C-39

• Wiring harness between connector C-38 and connector C-39

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-39

• Connector C-39 malfunction

• EPS control module malfunction

System wiring diagram

a30zzw00005422

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-39

• Wiring harness between EPS control module terminal 2C and connector C-39

• Wiring harness between EPS control module terminal 2A and connector C-39

• EPS control module

Possible cause

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

• Selector lever power supply voltage or body ground malfunction

• Open circuit in wiring harness between selector lever and connector C-39

• Connector C-39 malfunction

• Selector lever malfunction

System wiring diagram

a30zzw00005423

Inspection item

• Selector lever power supply voltage-related wiring harness and fuse

• Selector lever body ground related wiring harness

• Selector lever connector

• Connector C-39

• Wiring harness between selector lever terminal D and connector C-39

• Wiring harness between selector lever terminal B and connector C-39

• Selector lever

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-39

• Connector C-39 malfunction

• Body control module (BCM) malfunction

System wiring diagram

a30zzw00005424

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-39

• Wiring harness between body control module (BCM) terminal 3X and connector C-39

• Wiring harness between body control module (BCM) terminal 3W and connector C-39

• Body control module (BCM)