PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION [MULTIPLEX COMMUNICATION SYSTEM]


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System Wiring Diagram

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PCM (except MZ-CD 1.6 (Y6))

1.  Inspect the display of DTC U0101, U0121 and/or U0155, using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

TCM

DSC HU/CM or ABS HU/CM

Instrument cluster

PCM
•  Wiring harness A
•  PCM
×
×
•  Wiring harness B
•  TCM
×
•  Wiring harness E
×
×
•  Wiring harness F
•  DSC HU/CM or ABS HU/CM
×
×
•  Wiring harness G
•  Wiring harness H
•  Wiring harness K
•  Instrument cluster


PCM (MZ-CD 1.6 (Y6))

1.  Inspect the display of DTC U0118, U0121 and/or U0155, using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

DSC HU/CM or ABS HU/CM

Fuel additive control module

Instrument cluster

PCM
•  Wiring harness A
•  Wiring harness C
•  Wiring harness E
•  PCM
×
•  Wiring harness G
×
×
•  Wiring harness I
•  Wiring harness K
•  Instrument cluster
×
×
•  Wiring harness F
•  DSC HU/CM or ABS HU/CM
×
×
•  Wiring harness H
•  Fuel additive control module


TCM

1.  Inspect the display of DTC U0100 using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

PCM

TCM
•  Wiring harness A
•  Wiring harness B
•  TCM
•  PCM


EHPAS Control Module

1.  Inspect the display of DTC U0100 and/or U2023, using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

Caution
•  DTC U2023 may not be cleared during engine starting even if DTC clearing is done using the M-MDS. When clearing DTC U2023, execute with the ignition switch in the ON position (Engine off).
Note
•  You may want to check which unit is malfunctioning according to Freeze Frame Data. "Electrical" > "IC Service Function" > "Freeze Frame Data".This function is supported on IDS, not PDS.

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

PCM

EHPAS control module
•  Wiring harness A
•  Wiring harness C
•  Wiring harness D
•  EHPAS control module
•  PCM


DSC HU/CM or ABS HU/CM

1.  Inspect the display of DTC U1900, U2202 (with DSC) and/or U2523, using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

PCM

DSC HU/CM or ABS HU/CM
•  Wiring harness A
•  Wiring harness C
•  Wiring harness E
•  Wiring harness F
•  DSC HU/CM
•  ABS HU/CM
•  PCM


Fuel additive control module (MZ-CD 1.6 (Y6) High power-Euro 4)

1.  Inspect the display of DTC U1900 using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

PCM

Fuel additive control module
•  Wiring harness A
•  Wiring harness C
•  Wiring harness E
•  Wiring harness G
•  Wiring harness H
•  Fuel additive control module
•  PCM


Keyless control module

1.  Inspect the display of DTC U0100, U0323 and/or U2023, using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

Caution
•  DTC U2023 may not be cleared during engine starting even if DTC clearing is done using the M-MDS. When clearing DTC U2023, execute with the ignition switch in the ON position (Engine off).
Note
•  You may want to check which unit is malfunctioning according to Freeze Frame Data. "Electrical" > "IC Service Function" > "Freeze Frame Data".This function is supported on IDS, not PDS.

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

PCM

Instrument cluster

Keyless control module
•  Wiring harness J
•  Keyless control module
×
•  Wiring harness K
•  Instrument cluster
×
•  Wiring harness A
•  Wiring harness C
•  Wiring harness E
•  Wiring harness G
•  Wiring harness I
•  PCM


Instrument Cluster

1.  Inspect the display of DTC U0100, U0101, U0121 U0131 and/or U0214 using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

PCM

TCM

EHPAS control module

DSC HU/CM

or

ABS HU/CM

Keyless control module

Instrument cluster
•  Wiring harness K
•  Instrument cluster
×
•  Wiring harness G
•  Wiring harness I
×
×
•  Wiring harness E
×
×
×
•  Wiring harness C
×
×
×
×
•  Wiring harness A
•  PCM
×
×
×
×
•  Wiring harness B
•  TCM
×
×
×
×
•  Wiring harness D
•  EHPAS control module
×
×
×
×
•  Wiring harness F
•  DSC HU/CM or ABS HU/CM
×
×
×
×
•  Wiring harness J
•  Keyless control module

3.  Inspect the display of DTC U0140, U0151 and/or U0184, using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

4.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

PJB

SAS control module

Audio unit (base module)

Instrument cluster
•  Wiring harness L
•  Instrument cluster
×
×
•  Wiring harness Q
•  PJB
×
×
•  Wiring harness N
•  SAS control module
×
×
•  Wiring harness O
•  Audio unit (base module)


Climate Control Unit

1.  Inspect the display of DTC U0140, U0155 and/or U0184, using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

PJB

Instrument cluster

Audio unit (base module)

Climate control unit
•  Wiring harness M
•  Climate control unit
×
×
•  Wiring harness Q
•  PJB
×
×
•  Wiring harness L
•  Instrument cluster
×
×
•  Wiring harness O
•  Audio unit (base module)


SAS Control Module

1.  Inspect the display of DTC U1900 using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

Instrument cluster

SAS control module
•  Wiring harness L
•  Wiring harness N
•  SAS control module
•  Instrument cluster


Audio unit (base module)

1.  Inspect the display of DTC 16:Er12 using the self-diagnostic function. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

Instrument cluster

Audio unit (base module)
•  Wiring harness L
•  Wiring harness O
•  Audio unit (base module)
•  Instrument cluster


Information Display

1.  Inspect the display of DTC U0164, U0181 and/or U0184, using the input/output check mode. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

Instrument cluster

Climate control unit

Audio unit (base module)

Information display
•  Wiring harness P
•  Information display
×
×
•  Wiring harness L
•  Instrument cluster
×
×
•  Wiring harness M
•  Climate control unit
×
×
•  Wiring harness O
•  Audio unit (base module)


Water heater unit

1.  Inspect the display of DTC U1900 using the input/output check mode. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

PJB

Water heater unit
•  Wiring harness R
•  Wiring harness S
•  Water heater unit


PJB

1.  Inspect the display of DTC U1900 using the M-MDS. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)

2.  Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal
—: Communication error

Module

Communication status

Malfunction location

Climate control unit

Audio unit (base module)

Instrument cluster

PJB
•  Wiring harness L
•  Wiring harness M
•  Wiring harness O
•  Wiring harness Q
•  PJB
•  Climate control unit
•  Audio unit (base module)
•  Instrument cluster


Repair Procedure

1.  Inspect the connector of malfunctioning module.

•  If there is any malfunction, repair or replace the connector.

2.  Inspect the malfunctioning wiring harnesses as follow:

•  If there is any malfunction, repair or replace the wiring harnesses.
•  If there is no malfunction, replace the malfunctioning module.
―  Short to GND
―  Short to power supply
―  Twisted pair short each other
―  Open circuit

3.  Make sure to reconnect all disconnected connectors.

4.  Clear the CAN system related DTCs using the M-MDS.

5.  Verify if the CAN system related DTCs are displayed using the M-MDS.

•  If the same following DTCs are present, replace the malfunctioning module.
―  U0001 (PCM (MZ-CD 1.6 (Y6)))
―  U0073 (PCM (except MZ-CD 1.6 (Y6), TCM, EHPAS control module, keyless control module, instrument cluster, SAS control module)
―  U0516 (Climate control unit)
―  U1900 (PJB)
―  U2012 (DSC HU/CM or ABS HU/CM)
―  U2516 (Fuel additive control module, instrument cluster, information display)
•  If other DTC is present, perform the appropriate DTC inspection. (See DTC TABLE[MULTIPLEX COMMUNICATION SYSTEM].)