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

id100225001776

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 [L.H.D. (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.

Warning

<<High voltage>>

•  Always observe the following thoroughly to ensure safety when inspecting or removing/installing parts in the motor compartment. Otherwise, the high voltage circuit may operate on the vehicle regardless of whether or not the main power is switched OFF or ON (READY off or on). If this occurs, it could cause electrical shock and result in serious injury or, in the worst case, death.

―  Do not select high voltage battery cooling on center display after EV system stops

―  Do not open/close doors frequently with main power switched OFF

―  Do not perform normal charging or quick charging

―  Switch to connected vehicle maintenance mode (MyMazda App connected vehicle)

―  Cancel climate control timer

―  Operate center display and turn off battery heater operation

Warning

•  The cooling fan may suddenly start operating regardless of the main power switch position. Keep hands and tools away from the cooling fan even if the cooling fan is not operating to prevent injury, or damage to the cooling fan. When servicing the cooling fan or parts near the cooling fan, ensure the following.

―  Do not perform normal charging or quick charging

―  Do not select high voltage battery cooling on center display after EV system stops

―  Do not open/close doors frequently with main power switched OFF

―  Switch to connected vehicle maintenance mode (MyMazda App connected vehicle)

―  Cancel climate control timer

―  Operate center display and turn off battery heater operation

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

A

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-09

•  Connector C-09 malfunction

•  PCM malfunction

System wiring diagram

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Inspection item

•  PCM power supply voltage-related wiring harness and fuse

•  PCM body ground related wiring harness

•  PCM connector

•  Connector C-09

•  Wiring harness between PCM terminal AK and connector C-09

•  Wiring harness between PCM terminal AL and connector C-09

•  PCM

B

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-02

•  Open circuit in wiring harness between connector C-02 and connector C-09

•  Connector C-02 malfunction

•  Connector C-09 malfunction

•  Parking lock actuator malfunction

System wiring diagram

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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-02

•  Connector C-09

•  Wiring harness between connector C-09 and connector C-02

•  Wiring harness between parking lock actuator terminal E and connector C-02

•  Wiring harness between parking lock actuator terminal F and connector C-02

•  Parking lock actuator

C

Possible cause

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

•  Open circuit in wiring harness between connector C-09 and connector C-34

•  Connector C-09 malfunction

•  Connector C-34 malfunction

System wiring diagram

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Inspection item

•  Wiring harness between connector C-09 and connector C-34

•  Connector C-09

•  Connector C-34

D

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 connector C-34

•  Connector C-34 malfunction

•  Electronically controlled brake unit malfunction

System wiring diagram

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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

•  Connector C-34

•  Wiring harness between electronically controlled brake unit terminal 1AM and connector C-34

•  Wiring harness between electronically controlled brake unit terminal 1AO and connector C-34

•  Electronically controlled brake unit

E

Possible cause

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

•  Open circuit in wiring harness between connector C-34 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-34 malfunction

•  Connector C-07 malfunction

•  Connector C-21 malfunction

•  Connectors C-71, C-72 malfunction

System wiring diagram

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Inspection item

•  Wiring harness between connector C-34 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

•  Connector C-34

•  Connector C-07

•  Connector C-21

•  Connectors C-71, C-72

F

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

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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

G

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

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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

H

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

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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

I

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

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Inspection item

•  Connector C-38

•  Connector C-39

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

J

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

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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

K

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

a30zzw00001121

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

L

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

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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)