DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.2) [(E)]

id1002x2002100

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		×		×		×		×				×
Integrated starter generator (ISG)			×	×		×		×				×
DC-DC converter (Mazda M Hybrid)					×	×		×				×
DSC HU/CM / electronically controlled brake unit							×	×				×
Mazda M Hybrid battery									×			×
NOx sensor										×		×
PM sensor											×	×
Diagnostic result
Possible cause and inspection item		A	B	C	D	E	F	G	H	I	J	K

*1 :Except Chinese specs.

*2 :Chinese specs.

With Mazda M Hybrid

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 (SKYACTIV-G or SKYACTIV-X)

• Open circuit in wiring harness between PCM and connector C-02 (SKYACTIV-D)

• Open circuit in wiring harness between connector C-02 and connector C-01 (SKYACTIV-D)

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

• Connector C-01 malfunction

• Connector C-02 malfunction (SKYACTIV-D)

• PCM malfunction

System wiring diagram

am3zzw00030278

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 (SKYACTIV-D)

• Wiring harness between PCM terminal 2S and connector C-01 (SKYACTIV-G or SKYACTIV-X)

• Wiring harness between PCM terminal 2T and connector C-01 (SKYACTIV-G or SKYACTIV-X)

• Wiring harness between PCM terminal 1AI and connector C-02 (SKYACTIV-D)

• Wiring harness between PCM terminal 1AN and connector C-02 (SKYACTIV-D)

• Wiring harness between connector C-02 and connector C-01 (SKYACTIV-D)

• Wiring harness between connector C-01 and branch A

• PCM

Without Mazda M Hybrid

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-35, C-34 (SKYACTIV-G or SKYACTIV-X, with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Open circuit in wiring harness between PCM and branch B (SKYACTIV-G or SKYACTIV-X, without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Open circuit in wiring harness between PCM and connector C-02 (SKYACTIV-D)

• Open circuit in wiring harness between connector C-02 and connectors C-35, C-34 (SKYACTIV-D, with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Open circuit in wiring harness between connector C-02 and branch B (SKYACTIV-D, without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• connectors C-35, C-34 malfunction (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Connector C-02 malfunction (SKYACTIV-D)

• PCM malfunction

System wiring diagram

am3zzw00030279

Inspection item

• PCM power supply voltage-related wiring harness and fuse

• PCM body ground related wiring harness

• PCM connector

• Connectors C-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Connector C-02 (SKYACTIV-D)

• Wiring harness between PCM terminal 2S and connectors C-35, C-34 (SKYACTIV-G or SKYACTIV-X, with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between PCM terminal 2T and connectors C-35, C-34 (SKYACTIV-G or SKYACTIV-X, with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between PCM terminal 2S and branch B (SKYACTIV-G or SKYACTIV-X , without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Wiring harness between PCM terminal 2T and branch B (SKYACTIV-G or SKYACTIV-X, without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Wiring harness between PCM terminal 1AI and connector C-02 (SKYACTIV-D)

• Wiring harness between PCM terminal 1AN and connector C-02 (SKYACTIV-D)

• Wiring harness between connector C-02 and connectors C-35, C-34 (SKYACTIV-D, with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between connector C-02 and branch B (SKYACTIV-D, without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• PCM

Without Mazda M Hybrid and SKYACTIV-G or SKYACTIV-X

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-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Open circuit in wiring harness between PCM and branch B (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• connectors C-35, C-34 malfunction (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• PCM malfunction

System wiring diagram

am3zzw00030280

Inspection item

• PCM power supply voltage-related wiring harness and fuse

• PCM body ground related wiring harness

• PCM connector

• Connectors C-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between PCM terminal 2S and connectors C-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between PCM terminal 2T and connectors C-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between PCM terminal 2S and branch B (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Wiring harness between PCM terminal 2T and branch B (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• PCM

Possible cause

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

• Integrated starter generator (ISG) power supply voltage or body ground malfunction

• Open circuit in wiring harness between integrated starter generator (ISG) and branch A

• Integrated starter generator (ISG) malfunction

System wiring diagram

am3zzw00030281

Inspection item

• Integrated starter generator (ISG) power supply voltage-related wiring harness and fuse

• Integrated starter generator (ISG) body ground related wiring harness

• Integrated starter generator (ISG) connector

• Wiring harness between integrated starter generator (ISG) terminal 1C and branch A

• Wiring harness between integrated starter generator (ISG) terminal 1D and branch A

• Integrated starter generator (ISG)

Possible cause

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

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

• Open circuit in wiring harness between connector C-02 and connector C-31

• Connector C-02 malfunction

• Connector C-31 malfunction

System wiring diagram

am3zzw00030282

Inspection item

• Connector C-02

• Connector C-31

• Wiring harness between connector C-02 and connector C-31

Possible cause

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

• DC-DC converter (Mazda M Hybrid) power supply voltage or body ground malfunction

• Open circuit in wiring harness between DC-DC converter (Mazda M Hybrid) and connector C-31

• DC-DC converter (Mazda M Hybrid) malfunction

System wiring diagram

am3zzw00030283

Inspection item

• DC-DC converter (Mazda M Hybrid) power supply voltage-related wiring harness and fuse

• DC-DC converter (Mazda M Hybrid) body ground related wiring harness

• DC-DC converter (Mazda M Hybrid) connector

• Wiring harness between DC-DC converter (Mazda M Hybrid) terminal 1C and connector C-31

• Wiring harness between DC-DC converter (Mazda M Hybrid) terminal 1D and connector C-31

• Connector C-31

• DC-DC converter (Mazda M Hybrid)

Possible cause

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

• Open circuit in wiring harness between connector C-31 and connectors C-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Open circuit in wiring harness between connector C-31 and branch B (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Connector C-31 malfunction

• Connectors C-35, C-34 malfunction (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

System wiring diagram

am3zzw00030284

Inspection item

• Connector C-31

• Connectors C-35,C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between connector C-31 and connectors C-35,C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between connector C-31 and branch B (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

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-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Open circuit in wiring harness between DSC HU/CM / electronically controlled brake unit and branch B (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Connectors C-35, C-34 malfunction (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• DSC HU/CM / electronically controlled brake unit malfunction

System wiring diagram

am3zzw00030285

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-35,C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between electronically controlled brake unit terminal 1D and connectors C-35,C-34 (with Mazda M Hybrid, with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between electronically controlled brake unit terminal 1F and connectors C-35,C-34 (with Mazda M Hybrid, with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between electronically controlled brake unit terminal 1D and branch B (with Mazda M Hybrid, without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Wiring harness between electronically controlled brake unit terminal 1F and branch B (with Mazda M Hybrid, without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Wiring harness between DSC HU/CM terminal AQ and connectors C-35,C-34 (without Mazda M Hybrid, with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between DSC HU/CM terminal AN and connectors C-35,C-34 (without Mazda M Hybrid, with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between DSC HU/CM terminal AQ and branch B (without Mazda M Hybrid, without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Wiring harness between DSC HU/CM terminal AN and branch B (without Mazda M Hybrid, without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• DSC HU/CM / electronically controlled brake unit

Possible cause

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

• Open circuit in wiring harness between connectors C-35,C-34 and connector C-08 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Open circuit in wiring harness between branch B and connector C-08 (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Open circuit in wiring harness between connector C-08 and connector C-53

• Connectors C-35, C-34 malfunction (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Connector C-08 malfunction

• Connector C-53 malfunction

System wiring diagram

am3zzw00030286

Inspection item

• Connectors C-35,C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Connector C-08

• Connector C-53

• Wiring harness between connectors C-35,C-34 and connector C-08 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between branch B and connector C-08 (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Wiring harness between connector C-08 and connector C-53

Possible cause

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

• Mazda M Hybrid battery power supply voltage or body ground malfunction

• Open circuit in wiring harness between Mazda M Hybrid battery and connector C-53

• Connector C-53 malfunction

• Mazda M Hybrid battery malfunction

System wiring diagram

am3zzw00030287

Inspection item

• Mazda M Hybrid battery power supply voltage-related wiring harness and fuse

• Mazda M Hybrid battery body ground related wiring harness

• Mazda M Hybrid battery connector

• Connector C-53

• Wiring harness between Mazda M Hybrid battery terminal 1B and connector C-53

• Wiring harness between Mazda M Hybrid battery terminal 1E and branch A

• Mazda M Hybrid battery

Possible cause

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

• NOx sensor power supply voltage or body ground malfunction

• Open circuit in wiring harness between NOx sensor and connector C-53

• Connector C-53 malfunction

• NOx sensor malfunction

System wiring diagram

am3zzw00030288

Inspection item

• NOx sensor power supply voltage-related wiring harness and fuse

• NOx sensor body ground related wiring harness

• NOx sensor connector

• Connector C-53

• Wiring harness between NOx sensor terminal B and connector C-53

• Wiring harness between NOx sensor terminal C and connector C-53

• NOx sensor

Possible cause

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

• PM sensor power supply voltage or body ground malfunction

• Open circuit in wiring harness between PM sensor and connector C-53

• Connector C-53 malfunction

• PM sensor malfunction

System wiring diagram

am3zzw00030289

Inspection item

• PM sensor power supply voltage-related wiring harness and fuse

• PM sensor body ground related wiring harness

• PM sensor connector

• Connector C-53

• Wiring harness between PM sensor terminal B and connector C-53

• Wiring harness between PM sensor terminal C and connector C-53

• PM sensor

With Mazda M Hybrid

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-09

• Open circuit in wiring harness between connector C-09 and connector C-53

• Connector C-09 malfunction

• Connector C-53 malfunction

• Body control module (BCM) malfunction

System wiring diagram

am3zzw00030290

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-09

• Connector C-53

• Wiring harness between body control module (BCM) terminal 2H and connector C-09

• Wiring harness between body control module (BCM) terminal 2F and connector C-09

• Wiring harness between connector C-09 and connector C-53

• Body control module (BCM)

Without Mazda M Hybrid and SKYACTIV-G

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 connectors C-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Open circuit in wiring harness between body control module (BCM) and branch B (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Connectors C-35, C-34 malfunction (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Body control module (BCM) malfunction

System wiring diagram

am3zzw00030291

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

• Connectors C-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between body control module (BCM) terminal 2H and connectors C-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between body control module (BCM) terminal 2F and connectors C-35, C-34 (with Mazda M Hybrid (L.H.D.) or without Mazda M Hybrid (R.H.D.))

• Wiring harness between body control module (BCM) terminal 2H and branch B (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Wiring harness between body control module (BCM) terminal 2F and branch B (without Mazda M Hybrid (L.H.D.) or with Mazda M Hybrid (R.H.D.))

• Body control module (BCM)