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
Module	TCM	DSC HU/CM or ABS HU/CM	Instrument cluster	Malfunction location
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
Module	DSC HU/CM or ABS HU/CM	Fuel additive control module	Instrument cluster	Malfunction location
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
Module	PCM	Malfunction location
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
Module	PCM	Malfunction location
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
Module	PCM	Malfunction location
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
Module	PCM	Malfunction location
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
Module	PCM	Instrument cluster	Malfunction location
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
Module	PCM	TCM	EHPAS control module	DSC HU/CM or ABS HU/CM	Keyless control module	Malfunction location
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
Module	PJB	SAS control module	Audio unit (base module)	Malfunction location
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
Module	PJB	Instrument cluster	Audio unit (base module)	Malfunction location
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
Module	Instrument cluster	Malfunction location
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
Module	Instrument cluster	Malfunction location
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
Module	Instrument cluster	Climate control unit	Audio unit (base module)	Malfunction location
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
Module	PJB	Malfunction location
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
PJB	—	• Wiring harness L • Wiring harness M • Wiring harness O • Wiring harness Q • PJB • Climate control unit • Audio unit (base module) • Instrument cluster

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].)