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LAN

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LAN SYSTEM

K ELECTRICAL

SECTION LAN LAN SYSTEM
B

E
CONTENTS
CAN FUNDAMENTAL CAN F

PRECAUTIONS ......................................................... 2
. INDEX FOR DTC ...................................................... 39 .
Precautions When Using CONSULT-II .................... 2 . DTC No. Index ....................................................... 39 .
G
Precautions for Trouble Diagnosis .......................... 2 . HOW TO USE THIS SECTION ................................ 40 .
Precautions for Harness Repair .............................. 2 . Caution .................................................................. 40
.
SYSTEM DESCRIPTION ........................................... 3 . Abbreviation List .................................................... 40 .
CAN Communication System .................................. 3 . PRECAUTIONS ....................................................... 41 . H
SYSTEM DIAGRAM ............................................. 3 . Precautions for SRS Airbag and Pretensioner Seat-
CAN COMMUNICATION CONTROL CIRCUIT..... 4 belt ......................................................................... 41
.
Diag on CAN ........................................................... 5
. Precautions When Using CONSULT-II .................. 41 . I
DESCRIPTION ..................................................... 5
. Precautions for Trouble Diagnosis ........................ 41 .
SYSTEM DIAGRAM ............................................. 5 . Precautions for Harness Repair ............................ 41 .
TROUBLE DIAGNOSIS ............................................. 6 . TROUBLE DIAGNOSIS ........................................... 43 . J
Condition of Error Detection .................................... 6. CAN Diagnostic Support Monitor ........................... 43 .
CAN COMMUNICATION SYSTEM ERROR ........ 6 . MONITOR ITEM LIST (CONSULT-II) ................. 43 .
WHEN INDICATED "U1000" OR "U1001" IS INDI- CAN System Specification Chart ........................... 44 .
CATED EVEN THOUGH CAN COMMUNICA- CAN Communication Signal Chart ........................ 44 . LAN
TION SYSTEM IS NORMAL ................................ 6 . TYPE 1/TYPE 2/TYPE 3/TYPE 4 ....................... 44 .
Symptom When Error Occurs in CAN Communi- Wiring Diagram -- CAN -- .................................... 45 .
cation System .......................................................... 7
. Interview Sheet ...................................................... 46 . L
ERROR EXAMPLE .............................................. 7 . Data Sheet ............................................................. 47.
Self-Diagnosis ........................................................11
. CONSULT-II DATA ATTACHMENT SHEET ....... 47 .
CAN Diagnostic Support Monitor .......................... 12 . CAN System (Type 1) ............................................ 48 . M
MONITOR ITEM (CONSULT-II) ......................... 12 . DIAGNOSIS SHEET .......................................... 48 .
MONITOR ITEM (ON-BOARD DIAGNOSIS) ..... 13 . CAN System (Type 2) ............................................ 49 .
TROUBLE DIAGNOSES WORK FLOW ................. 14 . DIAGNOSIS SHEET .......................................... 49 .
Information Needed for Trouble Diagnosis ............ 14 . CAN System (Type 3) ............................................ 50 .
How to Use CAN Communication Signal Chart .... 14 . DIAGNOSIS SHEET .......................................... 50 .
Trouble Diagnosis Flow Chart ............................... 15 . CAN System (Type 4) ............................................ 51 .
Trouble Diagnosis Procedure ................................ 16 . DIAGNOSIS SHEET .......................................... 51 .
INTERVIEW WITH CUSTOMER ........................ 16 . Component Parts Location .................................... 52 .
INSPECTION OF VEHICLE CONDITION .......... 17 . Harness Layout ..................................................... 52 .
CHECK OF CAN SYSTEM TYPE (HOW TO USE Malfunction Area Chart .......................................... 53 .
CAN SYSTEM TYPE SPECIFICATION CHART).. 18 . BRANCH LINE ................................................... 53 .
CREATE INTERVIEW SHEET ........................... 20 . SHORT CIRCUIT ............................................... 53 .
CREATE DATA SHEET ...................................... 21 . ECM Branch Line Circuit ....................................... 53 .
CREATE DIAGNOSIS SHEET ........................... 23 . Data Link Connector Branch Line Circuit .............. 54 .
DETECT THE ROOT CAUSE ............................ 24 . TCM Branch Line Circuit ....................................... 54 .
Combination Meter Branch Line Circuit ................. 55 .
CAN Communication Circuit .................................. 56 .

LAN-1
PRECAUTIONS
[CAN FUNDAMENTAL]
PRECAUTIONS
[CAN FUNDAMENTAL] PFP:00001

Precautions When Using CONSULT-II BKS002A5

Use CONSULT-II CONVERTER when connecting CONSULT-II to data link connector.
CAUTION:
CAN communication does not function normally if CONSULT-II is used without connecting CONSULT-
II CONVERTER.
Precautions for Trouble Diagnosis BKS002A6

CAUTION:
q Never apply 7.0 V or more to the measurement terminal.
q Use a tester whose open terminal voltage is 7.0 V or less.
q Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when
checking the harness.
Precautions for Harness Repair BKS002A7

q Solder the repaired area and wrap tape around the soldered
area.
NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).

SKIB8766E

q Bypass connection is never allowed at the repaired area.
NOTE:
Bypass connection may cause CAN communication error as
spliced wires that are separate from the main line, or twisted
lines that lose noise immunity.

SKIB8767E

q Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communi-
cation line.

LAN-2
SYSTEM DESCRIPTION
[CAN FUNDAMENTAL]
SYSTEM DESCRIPTION PFP:00000
A
CAN Communication System BKS002A8

q CAN communication is a multiplex communication system. This enables it to transmit and receive many
communication signals at high speed by connecting control units with two communication lines (CAN-H B
and CAN-L).
q Control units on the CAN network transmit signals with CAN communication control circuit in the control
unit and receive only necessary signals from other control units for various controls. C
q CAN communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.
SYSTEM DIAGRAM
D

LAN

SKIB8712E L
Each control unit passes an electric current to the termination circuits when transmitting CAN communication
signal. The termination circuits produce an electrical potential difference between CAN-H and CAN-L. CAN
communication system transmits and receives CAN communication signals by the potential difference. M
Component Description
Main line CAN communication line between joint points
Branch line CAN communication line between joint point and a unit
Joint point A point connected a branch line with a main line
Termination circuit Refer to LAN-4, "CAN COMMUNICATION CONTROL CIRCUIT" .

LAN-3
SYSTEM DESCRIPTION
[CAN FUNDAMENTAL]
CAN COMMUNICATION CONTROL CIRCUIT

SKIB8713E

Component System description
CAN controller It controls CAN communication signal transmission and reception, error detection, etc.
It converts digital signal into CAN communication signal, and CAN communication signal into digi-
Transceiver IC
tal signal.
Noise filter It eliminates noise of CAN communication signal.

Termination circuit*
It produces potential difference.
(Resistance of approx. 120 )
*: These are the only control units wired with both ends of CAN communication system.

LAN-4
SYSTEM DESCRIPTION
[CAN FUNDAMENTAL]
Diag on CAN BKS002A9

DESCRIPTION A
"Diag on CAN" is a diagnosis using CAN communication instead of previous DDL1 and DDL2 communication
line, between control unit and diagnosis unit.
B
SYSTEM DIAGRAM

LAN

SKIB8714E

Name Harness Description
Tx
DDL1 It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
Rx
DDL2 K-LINE It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
CAN-H
Diag on CAN It is used for trouble diagnosis and control.
CAN-L

LAN-5
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS PFP:00004

Condition of Error Detection BKS002AA

"U1000" or "U1001" is indicated on SELF-DIAG RESULTS on CONSULT-II if CAN communication signal is not
transmitted or received between units for 2 seconds or more.
CAN COMMUNICATION SYSTEM ERROR
q CAN communication line open (CAN-H, CAN-L, or both)
q CAN communication line short (ground, between CAN communication lines, other harnesses)
q Error of CAN communication control circuit of the unit connected to CAN communication line
WHEN INDICATED "U1000" OR "U1001" IS INDICATED EVEN THOUGH CAN COMMUNICA-
TION SYSTEM IS NORMAL
q CONSULT-II CONVERTER not connected: Error may be detected by the self-diagnosis when not using
CONSULT-II CONVERTER (depending on the control unit that performs CAN communication).
q Removal/installation of parts: Error may be detected when removing and installing CAN communication
unit and related parts while turning the ignition switch ON. (A DTC except for CAN communication may be
detected.)
q Fuse blown out (removed): CAN communication of the unit may cease.
q Voltage drop: Error may be detected if voltage drops due to discharged battery when turning the ignition
switch ON (depending on the control unit that performs CAN communication).
q Error may be detected if the power supply circuit of the control unit, which performs CAN communication,
malfunctions (depending on the control unit that performs CAN communication).
q Error may be detected if reprogramming is not completed normally.
CAUTION:
CAN communication system is normal if "U1000" or "U1001" is indicated on SELF-DIAG RESULTS of
CONSULT-II under the above conditions. Erase the memory of the self-diagnosis of each unit.

LAN-6
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
Symptom When Error Occurs in CAN Communication System BKS002AB

A
In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit
and receive signals if any error occurs on CAN communication line. Under this condition, multiple control units
related to the root cause malfunction or start fail-safe mode.
B
ERROR EXAMPLE
NOTE:
q Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.
C
q For abbreviations, refer to LAN-40, "Abbreviation List" .
Example: TCM branch line open circuit
D

SKIB8738E

Unit name Symptom J
ECM Engine torque, etc. get out of control, and shift shock increases.
BCM Reverse warning chime does not sound.
LAN
EPS control unit Normal operation.
q Shift position indicator and OD OFF indicator turn OFF.
Combination meter
q Warning lamps turn ON. L
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
M
IPDM E/R Normal operation.

LAN-7
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
Example: Data link connector branch line open circuit

SKIB8739E

Unit name Symptom
ECM
BCM
EPS control unit
Combination meter Normal operation.
ABS actuator and electric unit (control unit)
TCM
IPDM E/R

CAUTION:
q When data link connector branch line is open, there is no influence on transmission and reception
of CAN communication signals. Therefore, no symptoms occur. However, be sure to repair mal-
functioning circuit.
q When data link connector branch line is open, screen-display of the CONSULT-II "SELECT SYS-
TEM" screen may be the same as the case when CAN communication line has short-circuit. How-
ever, symptoms differ depending on the case. See below and understand the differences. Do not
misunderstand malfunctioning circuit.
SELECT SYSTEM
Difference of symptom
(CONSULT-II)
Data link connector branch line open cir-
Normal operation.
cuit
All Diag on CAN units are not
indicated. Most the units which are connected to the CAN com-
CAN-H, CAN-L harness short-circuit munication system enter fail-safe mode or are deac-
tivated.

LAN-8
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
Example: Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Con-
trol Unit) Open Circuit A

SKIB8740E
G
Unit name Symptom
ECM Engine torque, etc. get out of control, and shift shock increases.
H
q Reverse warning chime does not sound.
BCM q The front wiper moves under the continuous operation mode even though the front
wiper switch turns to intermittent.
I
EPS control unit The steering effort increases.
q The shift position indicator and OD OFF indicator turn OFF.
Combination meter q The speedometer continues indicating 0. J
q The odo/trip meter stops.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation. LAN
When the ignition switch turns ON,
IPDM E/R q The headlamps (Lo) turn ON.
L
q The cooling fan continues rotating.

LAN-9
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
Example: CAN-H, CAN-L Harness Short Circuit

SKIB8741E

Unit name Symptom
q Engine torque, etc. get out of control, and shift shock increases.
ECM
q Engine speed drops.
q Reverse warning chime does not sound.
q The front wiper moves under the continuous operation mode even though the
front wiper switch turns to intermittent.
q The room lamp does not turn ON.
BCM
q The engine does not start (if an error or malfunction occurs while turning the igni-
tion switch is OFF.)
q The steering lock does not release (if an error or malfunction occurs while turning
the ignition switch is OFF.)
EPS control unit The steering effort increases.
q The tachometer and the speedometer do not move.
Combination meter q Warning lamps turn ON.
q Indicator lamps do not turn ON.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
When the ignition switch turns ON,
IPDM E/R q The headlamps (Lo) turn ON.
q The cooling fan continues rotating.

LAN-10
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
Self-Diagnosis BKS002AC

A
Self-diagnosis item
DTC DTC detection condition Inspection/Action
(CONSULT-II indication)
When ECM is not transmitting or receiving CAN
B
communication signal of OBD (emission-related
diagnosis) for 2 seconds or more.
U1000 CAN COMM CIRCUIT
When a control unit (except for ECM) is not Refer to LAN-14,
transmitting or receiving CAN communication "TROUBLE DIAG- C
signal for 2 seconds or more. NOSES WORK FLOW" .
When ECM is not transmitting or receiving CAN
U1001 CAN COMM CIRCUIT communication signal other than OBD (emis- D
sion-related diagnosis) for 2 seconds or more.
Start the inspection.
When a control unit is not transmitting or receiv-
Refer to the applicable E
U1002 SYSTEM COMM ing CAN communication signal for 2 seconds or
section of the indicated
less.
control unit.
When detecting error during the initial diagnosis Replace the control unit
U1010 CONTROL UNIT [CAN] F
of CAN controller of each control unit. indicating "U1010".

LAN

LAN-11
TROUBLE DIAGNOSIS
[CAN FUNDAMENTAL]
CAN Diagnostic Support Monitor BKS002AD

CONSULT-II and CAN diagnostic support monitor (on-board diagnosis function) are used for detecting root
cause.
MONITOR ITEM (CONSULT-II)
Example: CAN DIAG SUPPORT MNTR indication

SKIB8742E

Without PAST
Item PRSNT Description
OK Normal at present
Initial diagnosis
NG Control unit error (Except for some control units)
OK Normal at present
Transmission diagnosis Unable to transmit signals for 2 seconds or more.
UNKWN
Diagnosis not performed
OK Normal at present

Control unit name Unable to receive signals for 2 seconds or more.
(Reception diagnosis) UNKWN Diagnosis not performed
No control unit for receiving signals. (No applicable optional parts)

With PAST
Item PRSNT PAST Description
OK Normal at present and in the past

OK Normal at present, but unable to transmit signals for 2 seconds or more
Transmission diagnosis 1

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