PROCEDURES FOR DETERMINING LOCATION OF MALFUNCTION (L.H.D) [MULTIPLEX COMMUNICATION SYSTEM]

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DTC Output Unit Table

Note
•  The malfunctioning part can be determined by the DTCs which are output from each unit simultaneously. Determine the malfunctioning part referring to the following table.

DTC Output Unit

DTC

Page
PCM (except MZ-CD 1.6 (Y6))
•  U0121:00
•  U0140:00
•  U0151:00
•  U0155:00
(See PCM (except MZ-CD 1.6 (Y6)).)
PCM (MZ-CD 1.6 (Y6))
•  U0121:00
•  U0140:00
•  U0151:00
•  U0155:00
(See PCM (MZ-CD 1.6 (Y6)).)
ABS HU/CM
•  U0100:00
•  U0155:00
•  U2101:00
(See ABS HU/CM.)
DSC HU/CM
•  U0100:00
•  U0126:00
•  U0155:00
•  U2101:00
(See DSC HU/CM.)
BCM
•  U0100:00
•  U0121:00
(See BCM.)
Keyless control module
•  U0028:87
•  U0100:00
(See Keyless control module.)
SAS control module
•  U0155:00
(See SAS control module.)
EPS control module
•  U0100:00
•  U0121:00
(See EPS control module.)
Instrument cluster
•  U0100:00
•  U0121:00
•  U0131:00
•  U0140:00
•  U0151:00
•  U0214:00
(See Instrument cluster.)


PCM (except MZ-CD 1.6 (Y6))

1.  If DTCs are output from the control module, find the same DTC combination from the following table and refer to the possible causes of the malfunction.

×: Displayed

Displayed DTC

DTC output pattern
U0121:00
×
×
 
 
 
 
U0140:00
×
 
×
 
×
 
U0151:00
×
 
×
×
 
 
U0155:00
×
 
×
 
×
×
Malfunction location
A
B
C
D
E
F


A

Possible causes of malfunction
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between PCM and branch A
•  PCM malfunction
am2zzw00003191


B

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between ABS HU/CM and branch A (with ABS)
•  Open circuit in wiring harness between DSC HU/CM and branch A (with DSC)
•  ABS HU/CM malfunction (with ABS)
•  DSC HU/CM malfunction (with DSC)
•  PCM malfunction
am2zzw00003192


C

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch A and connector C-03
•  Open circuit in wiring harness between connector C-03 and branch B
•  PCM malfunction
am2zzw00003193


D

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between SAS control module and branch B
•  SAS control module malfunction
•  PCM malfunction
am2zzw00003194


E

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch B and BCM
•  BCM malfunction
•  PCM malfunction
am2zzw00003195


F

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  BCM malfunction
•  Open circuit in wiring harness between BCM and branch C
•  Open circuit in wiring harness between branch C and branch D
•  Open circuit in wiring harness between branch D and Instrument cluster
•  Instrument cluster malfunction
•  PCM malfunction
am2zzw00003196


PCM (MZ-CD 1.6 (Y6))

1.  If DTCs are output from the control module, find the same DTC combination from the following table and refer to the possible causes of the malfunction.

×: Displayed

Displayed DTC

DTC output pattern
U0121:00
×
×
 
 
 
 
U0140:00
×
 
×
 
×
 
U0151:00
×
 
×
×
 
 
U0155:00
×
 
×
 
×
×
Malfunction location
A
B
C
D
E
F


A

Possible causes of malfunction
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between PCM and branch A
•  PCM malfunction
am2zzw00004114


B

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between ABS HU/CM and branch A (with ABS)
•  Open circuit in wiring harness between DSC HU/CM and branch A (with DSC)
•  ABS HU/CM malfunction (with ABS)
•  DSC HU/CM malfunction (with DSC)
•  PCM malfunction
am2zzw00004115


C

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch A and connector C-03
•  Open circuit in wiring harness between connector C-03 and branch B
•  PCM malfunction
am2zzw00004116


D

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between SAS control module and branch B
•  SAS control module malfunction
•  PCM malfunction
am2zzw00004117


E

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch B and BCM
•  BCM malfunction
•  PCM malfunction
am2zzw00004118


F

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  BCM malfunction
•  Open circuit in wiring harness between BCM and branch C
•  Open circuit in wiring harness between branch C and branch D
•  Open circuit in wiring harness between branch D and Instrument cluster
•  Instrument cluster malfunction
•  PCM malfunction
am2zzw00004119


ABS HU/CM

1.  Verify the ABS HU/CM DTCs using the M-MDS and determine the malfunctioning part of the CAN system referring to the following table.

×: Displayed

Displayed DTC

DTC output pattern

U0100:00
×
×
 
 
U0155:00
×
 
×
 
U2101:00
 
 
 
×
Malfunction location
A
B
C
D


A

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between ABS HU/CM and branch A
•  ABS HU/CM malfunction
am2zzw00003197


B

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between PCM and branch A
•  PCM malfunction
•  ABS HU/CM malfunction
am2zzw00003198


C

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between ABS HU/CM and branch A
•  Open circuit in wiring harness between branch A and connector C-03
•  Open circuit in wiring harness between connector C-03 and branch B
•  Open circuit in wiring harness between branch B and BCM
•  BCM malfunction
•  Open circuit in wiring harness between BCM and branch C
•  Open circuit in wiring harness between branch C and branch D
•  Open circuit in wiring harness between branch D and instrument cluster
•  Instrument cluster malfunction
•  ABS HU/CM malfunction
am2zzw00003199


D

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Instrument cluster malfunction
•  ABS HU/CM malfunction
am2zzw00003200


DSC HU/CM

1.  Verify the DSC HU/CM DTCs using the M-MDS and determine the malfunctioning part of the CAN system referring to the following table.

×: Displayed

Displayed DTC

DTC output pattern

U0100:00
×
×
 
 
 
 
U0126:00
×
 
×
×
 
 
U0155:00
×
 
×
 
×
 
U2101:00
 
 
 
 
 
×
Malfunction location
A
B
C
D
E
F


A

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between DSC HU/CM and branch A
•  DSC HU/CM malfunction
am2zzw00003201


B

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between PCM and branch A
•  PCM malfunction
•  DSC HU/CM malfunction
am2zzw00003202


C

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch A and connector C-03
•  Open circuit in wiring harness between connector C-03 and branch B
•  Open circuit in wiring harness between branch B and BCM
•  BCM malfunction
•  Open circuit in wiring harness between BCM and branch C
•  Open circuit in wiring harness between branch C and branch D
•  DSC HU/CM malfunction
am2zzw00003203


D

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch D and EPS control module
•  EPS control module malfunction
•  DSC HU/CM malfunction
am2zzw00003204


E

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch D and instrument cluster
•  Instrument cluster malfunction
•  DSC HU/CM malfunction
am2zzw00003205


F

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Instrument cluster malfunction
•  DSC HU/CM malfunction
am2zzw00003206


BCM

1.  Verify the BCM DTCs using the M-MDS and determine the malfunctioning part of the CAN system referring to the following table.

×: Displayed

Displayed DTC

DTC output pattern
U0100:00
×
×
 
U0121:00
×
 
×
Malfunction location
A
B
C


A

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch A and connector C-03
•  Open circuit in wiring harness between connector C-03 and branch B
•  Open circuit in wiring harness between branch B and BCM
•  BCM malfunction
am2zzw00003207


B

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between PCM and branch A
•  PCM malfunction
•  BCM malfunction
am2zzw00003208


C

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between ABC HU/CM and branch A (with ABS)
•  Open circuit in wiring harness between DSC HU/CM and branch A (with DSC)
•  ABS HU/CM malfunction (with ABS)
•  DSC HU/CM malfunction (with DSC)
•  BCM malfunction
am2zzw00003209


Keyless control module

1.  Verify the keyless control module DTCs using the M-MDS and determine the malfunctioning part of the CAN system referring to the following table.

×: Displayed

Displayed DTC

DTC output pattern
U0028:87
×
 
U0100:00
×
×
Malfunction location
A
B


A

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  BCM malfunction
•  Open circuit in wiring harness between BCM and branch C
•  Open circuit in wiring harness between branch C and keyless control module
•  Keyless control module malfunction
am2zzw00003210


B

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between PCM and branch A
•  Open circuit in wiring harness branch A and connector C-03
•  Open circuit in wiring harness between connector C-03 and branch B
•  Open circuit in wiring harness between branch B and BCM
•  BCM malfunction
•  PCM malfunction
•  Keyless control module malfunction
am2zzw00003211


SAS control module

1.  Verify the SAS control module DTCs using the M-MDS and determine the malfunctioning part of the CAN system referring to the following table.

×: Displayed

Displayed DTC

DTC output pattern
U0155:00
×
Malfunction location
A


A

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between SAS control module and branch B
•  Open circuit in wiring harness between branch B and BCM
•  BCM malfunction
•  Open circuit in wiring harness between BCM and branch C
•  Open circuit in wiring harness between branch C and branch D
•  Open circuit in wiring harness between branch D and instrument cluster
•  Instrument cluster malfunction
•  SAS control module malfunction
am2zzw00003212


EPS control module

1.  Verify the EPS control module DTCs using the M-MDS and determine the malfunctioning part of the CAN system referring to the following table.

×: Displayed

Displayed DTC

DTC output pattern
U0100:00
×
 
×
U0121:00
 
×
×
Malfunction location
A
B
C


A

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  PCM malfunction
•  Open circuit in wiring harness between PCM and branch A
•  EPS control module malfunction
am2zzw00003213


B

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  ABS HU/CM malfunction (with ABS)
•  DSC HU/CM malfunction (with DSC)
•  Open circuit in wiring harness between ABS HU/CM and branch A (with ABS)
•  Open circuit in wiring harness between DSC HU/CM and branch A (with DSC)
•  EPS control module malfunction
am2zzw00003964


C

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch A and connector C-03
•  Open circuit in wiring harness between connector C-03 and branch B
•  Open circuit in wiring harness between branch B and BCM
•  BCM malfunction
•  Open circuit in wiring harness between BCM and branch C
•  Open circuit in wiring harness between branch C and branch D
•  Open circuit in wiring harness between branch D and EPS control module
•  EPS control module malfunction
am2zzw00003965


Instrument cluster

1.  Verify the instrument cluster DTCs using the M-MDS and determine the malfunctioning part of the CAN system referring to the following table.

×: Displayed

Displayed DTC

Flashing pattern
U0100:00
×
×
 
×
 
×
×
 
×
 
U0121:00
×
 
×
×
 
×
×
 
×
 
U0131:00
×
 
 
 
 
 
 
 
 
×
U0140:00
×
 
 
 
 
 
×
 
×
 
U0151:00
×
 
 
 
 
×
×
 
×
 
U0214:00
×
 
 
 
×
 
 
×
×
 
Malfunction location
A
B
C
D
E
F
G
H
I
J


A

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch D and instrument cluster
•  Instrument cluster malfunction
am2zzw00003216


B

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between PCM and branch A
•  PCM malfunction
•  Instrument cluster malfunction
am2zzw00003214


C

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between ABS HU/CM and branch A (with ABS)
•  Open circuit in wiring harness between DSC HU/CM and branch A (with DSC)
•  ABS HU/CM malfunction (with ABS)
•  DSC HU/CM malfunction (with DSC)
•  Instrument cluster malfunction
am2zzw00003217


D

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch A and connector C-03
•  Open circuit in wiring harness between connector C-03 and branch B
•  Instrument cluster malfunction
am2zzw00003218


E

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between SAS control module and branch B
•  SAS control module malfunction
•  Instrument cluster malfunction
am2zzw00003219


F

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch B and BCM
•  BCM control module malfunction
•  Instrument cluster malfunction
am2zzw00003220


G

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  BCM malfunction
•  Open circuit in wiring harness between BCM and branch C
•  Instrument cluster malfunction
am2zzw00003221


H

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch C and keyless control module
•  Keyless control module malfunction
•  Instrument cluster malfunction
am2zzw00003222


I

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between branch C and branch D
•  Instrument cluster malfunction
am2zzw00003223


J

Possible Causes
•  Connector terminal disconnection, poor contact, damage, deformation, corrosion
•  Open circuit in wiring harness between EPS control module and branch D
•  EPS control module malfunction
•  Instrument cluster malfunction
am2zzw00003224


Repair Procedure

1.  Inspect the connector connection of the malfunctioning module.

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

2.  Inspect the malfunctioning wiring harness for the following.

•  If there is any malfunction, replace the wiring harness.
•  If the wiring harness is normal, replace the malfunctioning module.
―  Short to ground
―  Short to power supply
―  Open circuit
―  Short between twisted pair wiring harness

3.  Reconnect the disconnected connectors.

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

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

•  If the unit which output the following DTCs outputs the same DTCs, replace the unit.
―  U0001:88 (ABS HU/CM (with ABS), BCM, keyless control module, SAS control module, EPS control module, instrument cluster)
―  U0073:00 (PCM)
•  If other CAN system related DTCs are output, perform the corresponding DTC inspection. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)