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DETERMINING OPEN CIRCUIT LOCATION (HS-CAN)

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 failed module on the M-MDS screen.
2. Apply the communication error DTC and the failed module to 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.)

3. Inspect the possible cause and inspection item of the applicable malfunctioning part.
4. After repairs, return to CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW, and verify that the repairs have been completed. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.)

DTC Output Pattern And Malfunctioning Location

Cross (×): Communication error-related DTC and failed module

M-MDS display

DTC output pattern and malfunctioning location

DTC output module

DTC

PCM

(PCM)

U0101:00

×

U0121:00

×

U0131:00

×

U0140:00

×

U0151:00

×

U0155:00

×

U0214:00

×

ABS

(DSC HU/CM)

U0100:00

×

U0101:00

×

U012B:00

×

U0131:00

×

U0151:00

×

U0155:00

×

EVP

(EVP control unit)

U0100:02

×

U0100:08

×

U0121:00

×

U0121:02

×

U0121:87

×

U0155:00

×

EPS

(EPS control module)

U0100:00

×

U0121:00

×

U0155:00

×

BCM

(BCM)

U0100:00

×

×

U0101:00

×

U0121:00

×

×

U0151:00

×

U0155:00

×

U0214:00

×

U023A:00

×

TCM*1

(TCM)

U0100:00

×

×

×

U0121:00

×

×

×

U0131:00

×

×

×

U0155:00

×

U0214:00

×

FSC*3

(Forward sensing camera (FSC))

U0100:00

×

×

×

×

×

U0121:00

×

×

×

×

×

U0131:00

×

×

×

×

×

U0140:00

×

×

×

×

U0155:00

×

U0214:00

×

AFS / ALM

(AFS control module*4)

U0100:00

×

×

×

×

×

×

U0131:00

×

×

×

×

×

×

U0140:00

×

×

×

×

×

U0155:00

×

AFS / ALM

(Auto leveling control module*5)

U0100:00

×

×

×

×

×

×

U0140:00

×

×

×

×

×

U0155:00

×

SSU

(Start stop unit)

U0100:00

×

×

×

×

×

×

×

U0101:00

×

×

×

×

×

U0121:00

×

×

×

×

×

×

×

U0121:87

×

×

×

×

×

×

×

U0131:00

×

×

×

×

×

×

×

U0140:00

×

×

×

×

×

×

U0146:00

×

×

×

×

×

×

U0151:00

×

U0155:00

×

CMU*6

(Connectivity master unit (CMU))

U0100:00

×

×

×

×

×

×

×

U0101:00

×

×

×

×

×

U0121:00

×

×

×

×

×

×

×

U0131:00

×

×

×

×

×

×

×

U0140:00

×

×

×

×

×

×

U0151:00

×

U0155:00

×

U0182:00

×

×

U0214:00

×

U023A:00

×

×

×

RCM

(SAS control module)

U0100:00

×

×

×

×

×

×

×

U0101:00

×

×

×

×

×

U0155:00

×

IC

(Instrument cluster)

U0100:00

×

×

×

×

×

×

×

U0101:00

×

×

×

×

×

U0121:00

×

×

×

×

×

×

×

U012B:00

×

×

×

×

×

×

U0131:00

×

×

×

×

×

×

×

U0140:00

×

×

×

×

×

×

U0151:00

×

U0156:00

×

U0182:00

×

×

U0214:00

×

U023A:00

×

×

×

M-MDS display module

[Fail] display pattern

PCM

×

×

×

×

×

×

×

ABS

×

×

×

×

×

×

×

EVP

×

×

×

×

×

×

×

EPS

×

×

×

×

×

×

×

BCM

×

×

×

×

×

×

TCM*1

×

×

×

×

×

AM*2

×

×

×

×

FSC*3

×

×

×

AFS/ALM*4, *5

×

×

SSU

×

CMU*6

×

RCM

×

IC

×

Diagnostic result

Possible cause and inspection item

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

*1
AT
*2
With Bose® type audio
*3
With forward sensing camera (FSC)
*4
With adaptive front lighting system (AFS)
*5
With headlight auto leveling system
*6
With center display

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 branch A

  • PCM malfunction

System wiring diagram

Inspection item

  • PCM power supply voltage or body ground malfunction

  • PCM body ground related wiring harness

  • PCM connector

  • Wiring harness between PCM terminal 2AK and branch A

  • Wiring harness between PCM terminal 2AL and branch A

  • PCM

B

Possible cause

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

  • DSC HU/CM power supply voltage or body ground malfunction

  • Open circuit in wiring harness between DSC HU/CM and branch A

  • DSC HU/CM malfunction

System wiring diagram

Inspection item

  • DSC HU/CM power supply voltage or body ground malfunction

  • DSC HU/CM body ground related wiring harness

  • DSC HU/CM connector

  • Wiring harness between DSC HU/CM terminal C and branch A

  • Wiring harness between DSC HU/CM terminal D and branch A

  • DSC HU/CM

C

Possible cause

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

  • EVP control unit power supply voltage or body ground malfunction

  • Open circuit in wiring harness between EVP control unit and branch A

  • EVP control unit malfunction

System wiring diagram

Inspection item

  • EVP control unit power supply voltage or body ground malfunction

  • EVP control unit body ground related wiring harness

  • EVP control unit connector

  • Wiring harness between EVP control unit terminal AD and branch A

  • Wiring harness between EVP control unit terminal Z and branch A

  • EVP control unit

D

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 branch A

  • EPS control module malfunction

System wiring diagram

Inspection item

  • EPS control module power supply voltage or body ground malfunction

  • EPS control module body ground related wiring harness

  • EPS control module connector

  • Wiring harness between EPS control module terminal 2B and branch A

  • Wiring harness between EPS control module terminal 2C and branch A

  • EPS control module

E

Possible cause

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

  • Open circuit in wiring harness between branch A and connectors C-38,C-39

  • Open circuit in wiring harness between connectors C-38,C-39 and BCM

  • Connectors C-38,C-39 malfunction

  • CAN circuit in BCM malfunction

System wiring diagram

Inspection item

  • Connectors C-38,C-39

  • BCM connector

  • Wiring harness between branch A and connectors C-38,C-39

  • Wiring harness between BCM terminal 3C and connector C-38

  • Wiring harness between BCM terminal 3D and connector C-39

  • BCM

    • Between BCM terminal 3C and BCM terminal 2D

    • Between BCM terminal 3D and BCM terminal 2C

F

Possible cause

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

  • BCM power supply voltage or body ground malfunction

  • BCM malfunction

System wiring diagram

Inspection item

  • BCM power supply voltage or body ground malfunction

  • BCM body ground related wiring harness

  • BCM

G

AT
    Possible cause

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

  • Open circuit in wiring harness between BCM and branch B

  • CAN circuit in BCM malfunction

System wiring diagram

    Inspection item

  • BCM connector

  • Wiring harness between BCM terminal 2D and branch B

  • Wiring harness between BCM terminal 2C and branch B

  • BCM

    • Between BCM terminal 3C and BCM terminal 2D

    • Between BCM terminal 3D and BCM terminal 2C

MT
    Possible cause

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

  • Open circuit in wiring harness between BCM and connector C-42

  • Connector C-42 malfunction

  • CAN circuit in BCM malfunction

System wiring diagram

    Inspection item

  • BCM connector

  • Connector C-42

  • Wiring harness between BCM terminal 2D and connector C-42

  • Wiring harness between BCM terminal 2C and connector C-42

  • BCM

    • Between BCM terminal 3C and BCM terminal 2D

    • Between BCM terminal 3D and BCM terminal 2C

H

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 branch B

  • TCM malfunction

System wiring diagram

Inspection item

  • TCM power supply voltage or body ground malfunction

  • TCM body ground related wiring harness

  • TCM connector

  • Wiring harness between TCM terminal 2G and branch B

  • Wiring harness between TCM terminal 2C and branch B

  • TCM

I

Possible cause

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

  • Open circuit in wiring harness between branch B and connector C-42

  • Connector C-42 malfunction

System wiring diagram

Inspection item

  • Connector C-42

  • Wiring harness between branch B and connector C-42

J

Possible cause

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

  • Audio amplifier power supply voltage or body ground malfunction

  • Open circuit in wiring harness between audio amplifier and connector C-42

  • Audio amplifier malfunction

System wiring diagram

Inspection item

  • Audio amplifier power supply voltage or body ground malfunction

  • Audio amplifier body ground related wiring harness

  • Audio amplifier connector

  • Wiring harness between audio amplifier terminal 2L and connector C-42

  • Wiring harness between audio amplifier terminal 2N and connector C-42

  • Audio amplifier

K

With occupant classification sensor
    Possible cause

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

  • Open circuit in wiring harness between connector C-42 and branch C

  • Connector C-42 malfunction

System wiring diagram

    Inspection item

  • Connector C-42

  • Wiring harness between connector C-42 and branch C

Without occupant classification sensor and with forward sensing camera (FSC)
    Possible cause

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

  • Open circuit in wiring harness between connector C-42 and connector C-25

  • Open circuit in wiring harness between connector C-25 and connector C-14

  • Open circuit in wiring harness between connector C-14 and connector C-17

  • Open circuit in wiring harness between connector C-17 and branch D

  • Connector C-42 malfunction

  • Connector C-25 malfunction

  • Connector C-14 malfunction

  • Connector C-17 malfunction

System wiring diagram

    Inspection item

  • Connector C-42

  • Connector C-25

  • Connector C-14

  • Connector C-17

  • Wiring harness between connector C-42 and connector C-25

  • Wiring harness between connector C-25 and connector C-14

  • Wiring harness between connector C-14 and connector C-17

  • Wiring harness between connector C-17 and branch D

Without occupant classification sensor and without forward sensing camera (FSC)
    Possible cause

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

  • Open circuit in wiring harness between connector C-42 and connector C-25

  • Open circuit in wiring harness between connector C-25 and connector C-14

  • Open circuit in wiring harness between connector C-14 and connector C-17

  • Open circuit in wiring harness between connector C-17 and connector C-17

  • Open circuit in wiring harness between connector C-17 and branch E

  • Connector C-42 malfunction

  • Connector C-25 malfunction

  • Connector C-14 malfunction

  • Connector C-17 malfunction

System wiring diagram

    Inspection item

  • Connector C-42

  • Connector C-25

  • Connector C-14

  • Connector C-17

  • Wiring harness between connector C-42 and connector C-25

  • Wiring harness between connector C-25 and connector C-14

  • Wiring harness between connector C-14 and connector C-17

  • Wiring harness between connector C-17 and connector C-17

  • Wiring harness between connector C-17 and branch E

With occupant classification sensor and with forward sensing camera (FSC)
    Possible cause

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

  • Open circuit in wiring harness between branch C and connector C-25

  • Open circuit in wiring harness between connector C-25 and connector C-14

  • Open circuit in wiring harness between connector C-14 and connector C-17

  • Open circuit in wiring harness between connector C-17 and branch D

  • Connector C-25 malfunction

  • Connector C-14 malfunction

  • Connector C-17 malfunction

System wiring diagram

    Inspection item

  • Connector C-25

  • Connector C-14

  • Connector C-17

  • Wiring harness between branch C and connector C-25

  • Wiring harness between connector C-25 and connector C-14

  • Wiring harness between connector C-14 and connector C-17

  • Wiring harness between connector C-17 and branch D

With occupant classification sensor and without forward sensing camera (FSC)
    Possible cause

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

  • Open circuit in wiring harness between branch C and connector C-25

  • Open circuit in wiring harness between connector C-25 and connector C-14

  • Open circuit in wiring harness between connector C-14 and connector C-17

  • Open circuit in wiring harness between connector C-17 and connector C-17

  • Open circuit in wiring harness between connector C-17 and branch E

  • Connector C-25 malfunction

  • Connector C-14 malfunction

  • Connector C-17 malfunction

System wiring diagram

    Inspection item

  • Connector C-25

  • Connector C-14

  • Connector C-17

  • Wiring harness between branch C and connector C-25

  • Wiring harness between connector C-25 and connector C-14

  • Wiring harness between connector C-14 and connector C-17

  • Wiring harness between connector C-17 and connector C-17

  • Wiring harness between connector C-17 and branch E

L

Possible cause

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

  • Forward sensing camera (FSC) power supply voltage or body ground malfunction

  • Open circuit in wiring harness between forward sensing camera (FSC) and branch D

  • Forward sensing camera (FSC) malfunction

System wiring diagram

Inspection item

  • Forward sensing camera (FSC) power supply voltage or body ground malfunction

  • Forward sensing camera (FSC) body ground related wiring harness

  • Forward sensing camera (FSC) connector

  • Wiring harness between forward sensing camera (FSC) terminal E and branch D

  • Wiring harness between forward sensing camera (FSC) terminal C and branch D

  • Forward sensing camera (FSC)

M

Possible cause

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

  • Open circuit in wiring harness between branch D and connector C-17

  • Open circuit in wiring harness between connector C-17 and branch E

  • Connector C-17 malfunction

System wiring diagram

Inspection item

  • Connector C-17

  • Wiring harness between branch D and connector C-17

  • Wiring harness between connector C-17 and branch E

N

Possible cause

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

  • AFS control module / auto leveling control module power supply voltage or body ground malfunction

  • Open circuit in wiring harness between AFS control module / auto leveling control module and branch E

  • AFS control module / auto leveling control module malfunction

System wiring diagram

Inspection item

  • AFS control module / auto leveling control module power supply voltage or body ground malfunction

  • AFS control module / auto leveling control module body ground related wiring harness

  • AFS control module / auto leveling control module connector

  • Wiring harness between AFS control module / auto leveling control module terminal A and branch E

  • Wiring harness between AFS control module / auto leveling control module terminal B and branch E

  • AFS control module / auto leveling control module

O

Possible cause

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

  • Open circuit in wiring harness between branch E and connector C-41

  • Connector C-41 malfunction

System wiring diagram

Inspection item

  • Connector C-41

  • Wiring harness between branch E and connector C-41

P

Possible cause

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

  • Start stop unit power supply voltage or body ground malfunction

  • Open circuit in wiring harness between start stop unit and connector C-19

  • Open circuit in wiring harness between connector C-19 and connector C-41

  • Connector C-19 malfunction

  • Connector C-41 malfunction

  • Start stop unit malfunction

System wiring diagram

Inspection item

  • Start stop unit power supply voltage or body ground malfunction

  • Start stop unit body ground related wiring harness

  • Start stop unit connector

  • Connector C-19

  • Connector C-41

  • Wiring harness between connector C-19 and connector C-41

  • Wiring harness between start stop unit terminal 2M and connector C-19

  • Wiring harness between start stop unit terminal 2O and connector C-19

  • Start stop unit

Q

Possible cause

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

  • Connectivity master unit (CMU) power supply voltage or body ground malfunction

  • Wiring harness between connectivity master unit (CMU) and connector C-41

  • Connector C-41 malfunction

  • Connectivity master unit (CMU) malfunction

System wiring diagram

Inspection item

  • Connectivity master unit (CMU) power supply voltage or body ground malfunction

  • Connectivity master unit (CMU) body ground related wiring harness

  • Connectivity master unit (CMU) connector

  • Connector C-41

  • Wiring harness between connectivity master unit (CMU) terminal 2E and connector C-41

  • Wiring harness between connectivity master unit (CMU) terminal 2F and connector C-41

  • Connectivity master unit (CMU)

R

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 connector C-41

  • Connector C-41 malfunction

  • SAS control module malfunction

System wiring diagram

Inspection item

WARNING:

  • SAS control module power supply voltage or body ground malfunction

  • SAS control module body ground related wiring harness

  • SAS control module connector

  • Connector C-41

  • Wiring harness between SAS control module terminal 3Q and connector C-41

  • Wiring harness between SAS control module terminal 3S and connector C-41

  • SAS control module

S

Possible cause

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

  • Instrument cluster power supply voltage or body ground malfunction

  • Open circuit in wiring harness between instrument cluster and connector C-41

  • Connector C-41 malfunction

  • Instrument cluster malfunction

System wiring diagram

Inspection item

  • Instrument cluster power supply voltage or body ground malfunction

  • Instrument cluster body ground related wiring harness

  • Instrument cluster connector

  • Connector C-41

  • Wiring harness between instrument cluster terminal B and connector C-41

  • Wiring harness between instrument cluster terminal D and connector C-41

  • Instrument cluster

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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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