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CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)]

CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)]

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Note
•  It is necessary to select the CAN BUS to be diagnosed.Verify the module displayed in red (communication disabled) or blue (communication disabled or module not installed) from the network view on the M-MDS, and select any one CAN BUS between No.1 to 8.

CAN topology

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1.  Connect the M-MDS to the DLC-2.

2.  Verify the module displayed in red or blue on the M-MDS using the network view.

3.  Verify the applicable CAN BUS table and select the CAN BUS reference corresponding to the module displayed in red or blue on the M-MDS. (See CAN BUS table.)

Note
•  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.


CAN BUS table

Cross (×): module displayed in red or blue

CAN communication related module

CAN BUS No.1

CAN BUS No.2

CAN BUS No.3

CAN BUS No.4

CAN BUS No.5

CAN BUS No.6

CAN BUS No.7

CAN BUS No.8
EPS control module
×
 
 
 
 
 
 
 
auto leveling control module / adaptive LED headlights control module
×
 
 
 
 
 
 
 
SAS control module
×
 
 
 
 
 
 
 
Electronically controlled brake unit / DSC HU/CM
×
×
 
 
 
 
 
 
TCM
×
 
 
 
 
 
 
 
PCM
×
×
 
 
 
 
 
 
PM sensor
 
×
 
 
 
 
 
 
NOx sensor
 
×
 
 
 
 
 
 
Mazda M Hybrid battery
 
×
 
 
 
 
 
 
DC-DC converter (Mazda M Hybrid)
 
×
 
 
 
 
 
 
Integrated starter generator (ISG)
 
×
 
 
 
 
 
 
Front combination light (LH)
 
 
×
 
 
 
 
 
Front combination light (RH)
 
 
×
 
 
 
 
 
Active driving display
 
 
×
 
 
 
 
 
Climate control unit
 
 
×
 
 
 
 
 
Steering angle sensor
 
 
×
 
 
 
 
 
Instrument cluster
 
 
×
 
 
 
 
 
Steering lock unit
 
 
×
 
 
 
 
 
Door-electrical supply unit (passenger's side)
 
 
×
 
 
 
 
 
LF control unit
 
 
×
 
 
 
 
 
Shift panel (indicator)
 
 
×
 
 
 
 
 
Dash-electrical supply unit
 
 
×
 
 
 
 
 
Door-electrical supply unit (driver's side)
 
 
×
 
 
 
 
 
PLG control module
 
 
×
    
 
 
 
electrical supply unit (ESU)
 
 
×
×
 
 
 
 
Rear side radar sensor (RH)
 
 
 
×
 
 
 
 
Parking assist unit (ultrasonic)
 
 
 
×
 
 
 
 
Parking assist unit (optical) / 360° view monitor control module
 
 
 
 
×
 
 
 
Driver monitoring camera unit
 
 
 
 
×
 
 
 
Forward sensing camera (FSC)
 
 
 
 
×
 
 
 
Front side radar sensor (LH)
 
 
 
 
 
×
 
 
Front radar sensor
 
 
 
 
 
×
 
 
Audio amplifier
 
 
 
 
 
 
×
 
Connectivity master unit (CMU)
 
 
 
 
 
 
×
 
Emergency call unit
 
 
 
 
 
 
 
×
Vehicle control module (VCM)
×
 
 
×
×
×
 
 
Body control module (BCM)
×
×
×
 
 
×
×
×
Diagnostic result
CAN BUS reference
(See CAN-BUS No.1.)
(See CAN-BUS No.2.)
(See CAN-BUS No.3.)
(See CAN-BUS No.4.)
(See CAN-BUS No.5.)
(See CAN-BUS No.6.)
(See CAN-BUS No.7.)
(See CAN-BUS No.8.)


CAN-BUS No.1

Caution
•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.
•  Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS NO.1
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between body control module (BCM) terminal 3X and body ground
―  Between body control module (BCM) terminal 3W and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.1 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.1.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.1) [(E)].)
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.1
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at body control module (BCM) terminal 3X and 3W.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.1 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.1.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.1) [(E)].)
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.1
•  Measure the voltage at body control module (BCM) terminals 3X and 3W.
•  Is the voltage at body control module (BCM) terminals 3X and 3W the same?
Yes
Short between circuits in CAN-BUS No.1 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.1.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.1) [(E)].)
No
An open circuit in CAN-BUS No.1 has occurred.
Determine the location of an open circuit in CAN-BUS No.1.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.1) [(E)].)


CAN-BUS No.2

Caution
•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.
•  Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS No.2
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between body control module (BCM) terminal 2H and body ground
―  Between body control module (BCM) terminal 2F and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.2 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.2.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.2) [(E)].)
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.2
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at body control module (BCM) terminal 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.2 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.2.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.2) [(E)].)
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.2
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage at body control module (BCM) terminals 2H and 2F the same?
Yes
Short between circuits in CAN-BUS No.2 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.2.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.2) [(E)].)
No
An open circuit in CAN-BUS No.2 has occurred.
Determine the location of an open circuit in CAN-BUS No.2.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.2) [(E)].)


CAN-BUS No.3

Caution
•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.
•  Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS No.3
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between body control module (BCM) terminal 2L and body ground
―  Between body control module (BCM) terminal 2J and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.3 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.3.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.3) [(E)].)
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.3
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at body control module (BCM) terminal 2L and 2J.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.3 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.3.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.3) [(E)].)
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.3
•  Measure the voltage at body control module (BCM) terminals 2L and 2J.
•  Is the voltage at body control module (BCM) terminals 2L and 2J the same?
Yes
Short between circuits in CAN-BUS No.3 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.3.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.3) [(E)].)
No
An open circuit in CAN-BUS No.3 has occurred.
Determine the location of an open circuit in CAN-BUS No.3.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.3) [(E)].)


CAN-BUS No.4

Caution
•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.
•  Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS No.4
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between body control module (BCM) terminal 2D and body ground
―  Between body control module (BCM) terminal 2B and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.4 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.4.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.4) [(E)].)
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.4
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at body control module (BCM) terminal 2D and 2B.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.4 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.4.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.4) [(E)].)
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.4
•  Measure the voltage at body control module (BCM) terminals 2D and 2B.
•  Is the voltage at body control module (BCM) terminals 2D and 2B the same?
Yes
Short between circuits in CAN-BUS No.4 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.4.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.4) [(E)].)
No
An open circuit in CAN-BUS No.4 has occurred.
Determine the location of an open circuit in CAN-BUS No.4.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.4) [(E)].)


CAN-BUS No.5

Caution
•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.
•  Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS No.5
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between body control module (BCM) terminal 2E and body ground
―  Between body control module (BCM) terminal 2G and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.5 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.5.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.5) [(E)].)
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.5
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at body control module (BCM) terminal 2E and 2G.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.5 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.5.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.5) [(E)].)
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.5
•  Measure the voltage at body control module (BCM) terminals 2E and 2G.
•  Is the voltage at body control module (BCM) terminals 2E and 2G the same?
Yes
Short between circuits in CAN-BUS No.5 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.5.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.5) [(E)].)
No
An open circuit in CAN-BUS No.5 has occurred.
Determine the location of an open circuit in CAN-BUS No.5.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.5) [(E)].)


CAN-BUS No.6

Caution
•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.
•  Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS No.6
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between body control module (BCM) terminal 2A and body ground
―  Between body control module (BCM) terminal 2C and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.6 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.6.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.6) [(E)].)
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.6
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at body control module (BCM) terminal 2A and 2C.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.6 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.6.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.6) [(E)].)
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.6
•  Measure the voltage at body control module (BCM) terminals 2A and 2C.
•  Is the voltage at body control module (BCM) terminals 2A and 2C the same?
Yes
Short between circuits in CAN-BUS No.6 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.6.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.6) [(E)].)
No
An open circuit in CAN-BUS No.6 has occurred.
Determine the location of an open circuit in CAN-BUS No.6.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.6) [(E)].)


CAN-BUS No.7

Caution
•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.
•  Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS No.7
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between body control module (BCM) terminal 4R and body ground
―  Between body control module (BCM) terminal 4Q and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.7 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.7.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.7) [(E)].)
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.7
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at body control module (BCM) terminal 4R and 4Q.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.7 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.7.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.7) [(E)].)
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.7
•  Measure the voltage at body control module (BCM) terminals 4R and 4Q.
•  Is the voltage at body control module (BCM) terminals 4R and 4Q the same?
Yes
Short between circuits in CAN-BUS No.7 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.7.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.7) [(E)].)
No
An open circuit in CAN-BUS No.7 has occurred.
Determine the location of an open circuit in CAN-BUS No.7.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.7) [(E)].)


CAN-BUS No.8

Caution
•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.
•  Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS No.8
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between body control module (BCM) terminal 3V and body ground
―  Between body control module (BCM) terminal 3U and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.8 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.8.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.8) [(E)].)
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.8
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at body control module (BCM) terminal 3V and 3U.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.8 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.8.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.8) [(E)].)
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.8
•  Measure the voltage at body control module (BCM) terminals 3V and 3U.
•  Is the voltage at body control module (BCM) terminals 3V and 3U the same?
Yes
Short between circuits in CAN-BUS No.8 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.8.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.8) [(E)].)
No
An open circuit in CAN-BUS No.8 has occurred.
Determine the location of an open circuit in CAN-BUS No.8.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.8) [(E)].)