2006 MITSUBISHI COLT Service Repair Manual

GROUP 35
SERVICE BRAKE
CONTENTS
BASIC BRAKE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35A
ANTI-SKID BRAKE SYSTEM (ABS) . . . . . . . . . . . . . . . . . . . . .35B
ACTIVE STABILITY CONTROL SYSTEM (ASC). . . . . . . . . . . .35C

GROUP 54C
CONTROLLER
AREA NETWORK
(CAN)
CONTENTS
GENERAL INFORMATIO N . . . . . . . .54C-2
STRUCTURE . . . . . . . . . . . . . . . . . . .54C-3
OPERATION . . . . . . . . . . . . . . . . . . .54C-4
SELF-DIAGNOSIS . . . . . . . . . . . . . . .54C-6
CAN BUS DIAGNOSTICS . . . . . . . . .54C-6

GENERAL INFORMATION
CONTROLLER AREA NETWORK (CAN)54C-2
GENERAL INFORMATION
M2542000100159
CAN, an abbreviation for Controller Area Network, is
an ISO-certified international standard for a serial
multiplex communication protocol
*1. A communica-
tion circuit employing the CAN protocol connects
each ECU, and sensor data can be shared among,
which enables more reduction in wiring.
NOTE: *1: The regulations have been decided in
detail, from software matters such as the necessary
transmission rate for communication, the system,
data format, and communication timing control
method to hardware matters such as the harness
type and length and the resistance values.
CAN offers the following advantages.
•Transmission rates are much faster than those in
conventional communication (up to 1 Mbps),
allowing much more data to be sent.
•It is exceptionally immune to noise, and the data
obtained from each error detection device is more
reliable.
•Each ECU connected via the CAN communicates
independently, therefore if the ECU enters dam
-
aged mode, communications can be continued in
some cases.

STRUCTURE
CONTROLLER AREA NETWORK (CAN)54C-3
STRUCTURE
M2542000200383
AC204755AC204755AF
Engine-ECU
or
Engine-
CVT-ECUEPS-ECU
M.U.T.-III
ETACS
-ECU
ABS-ECU
or
ASC-ECU
Steering
wheel
sensor G and
yaw rate
sensor
CAN_H
CAN_L Diagnosis
connector
Combination
meter
(incorporating
meter-A/C-ECU)
: Shows sub bus line. : Shows main bus line. Terminal resistor
Terminal resistor Main bus lines
•The CAN bu s line consist s of two lines, CAN_L
and
CAN_H (CAN Low and CAN Hig h , respec
-
tively), as well as two terminal re sistors (A
twisted-p
a ir cable, highly resist ant to noise, is
used for
the communicatio n s line) .
•The CAN bu s line connectin g the two terminal
resist
ors is th e main bus line, an d the CAN bus
line connecting
each ECU is th e su b-bus lin e.
•The terminal resistors are inst alled in the
eng
ine-ECU or eng ine-CVT - ECU
and
combin ation mete r (incorpora t ing
meter-A/C-ECU) to st
abi lize co mmunicatio n sig
-
nals (The terminal resist ance is se t at ap proxi-
mately 120 Ω).
•ECUs are conn ected in th e CAN bus line as fo l-
lows.
•En gine -ECU or e ngine -CVT -ECU

•ABS-ECU or
A
S C-ECU
•G and ya w ra te se nsor
•St e e ring wh eel sensor
•EPS-ECU
•E T ACS-ECU
•Co mbinatio n me ter (in c orpo rating
meter-A/C-ECU)

OPERATION
CONTROLLER AREA NETWORK (CAN)54C-4
OPERATION
M2542000300313
AC206267
ECU-1A
AAA
BBB CCA
B
Interval "a"
Interval "b" Interval "c"
CCC BB
AAA
ECU-1
ECU-2
CAN bus
Data frames
AC206267
AD
Transmission
suspended by
mediation
Re-
transmission
The CAN commun ica t ion system is describe d below .
•Each ECU communicating with CAN pe riodically
se
nds several sensors’ inf o rmation on CAN bu s
as dat
a frame (calle d periodical send ing d a t a ).
For furt
her det ails, co nsult the dat a frame sectio n
.
•ECUs requirin g dat a on CAN bu s can receive
dat
a fra m es sen t from each ECU simult aneo usly .
•The dat a se nt from each ECU condu cting CAN
co
mmunicatio n is transmitted at 10-100 0 msec
in
terva l dep endin g on n e cessity of dat a.
NOTE: In the f i gure ab ove, th e dat a frame A is trans-
mitted in "a" intervals, while the d a t a frames B
and
C are tran smitted at int e rvals "b" and "c,"
respective
ly .
•A single ECU tra n smit s multiple dat a frames.
•When dat a frames conf lict with o ne ano ther
(when
plural ECUs tr ansmit signals simu lt ane
-
ously), data is prioriti sed for transmission b y
mediat
ion, t herefore , plu r al da t a frames are not
se
nt simult aneously . F o r furthe r det ails, consult
the
mediatio n se ctio n
.
•Data is transmitted no t by the conve n tion al volt-
age-using method b u t by volt a ge pot entia l dif f er-
ence. For further det ails, consu l t the section on
CAN
bus volt ag e transformation
.
•Reliability of each ECU transmitting sig nals via
CAN
commun ica t ion is secu red by several error
det
ection and reco very processes. For furth e r
det
ails, consult the sections on error detection
and
sy stem rec o very
.
MEDIA T I O N
Because ea ch ECU transmit s dat a indepe ndently o n
the CAN bus,
there a r e ca ses of da t a collision whe n
multiple dat
a frames that ECUs at temp t to tran smit
simult
ane ously (if mu ltiple ECUs tran smit at n early
the same
moment). At th is moment, p r ocessing of
the ECUs atte
mpting tra n smission is performed in
the followin
g way .
1.Dat a frame with high priority is tra n smitted first
accord ing to ID cod e s memo rize d in dat a frames.
2.T r ansmission of lo w-p r iori ty dat a (dat a frames) is
suspe nded b y the issuin g ECUs until the bus
clears (when no transmission da t a exist s on the
CAN bus).
NO TE: If th e su spen ded st a t e co ntinu e s fo r a sp e-
cific time, new d a t a (dat a frame content ) is cre-
ated and sent.
3.ECU cont aining suspende d dat a fra m es trans-
mits the dat a when t he bus become s available .
NOTE: The re is enou gh ca p a city on t he CAN bus,
wh
ich
neve r prevent s da t a f r ames from being se nt.

OPERATION
CONTROLLER AREA NETWORK (CAN)54C-5
VOLTAGE TRANSFORMATION ON THE
CAN BUS
AC204753
Voltage
transformation
in CAN_L
State:
Logic value:Recessive Recessive
Dominant 3.5 V
2.5 V
1.5 V
0
1
AC
Voltage
transformation
in CAN_H
Dat
a f r ame t r ansmissio n throu gh the CAN bu s line
i
n vo lve s vo lt ag e tran sfo r ma ti on (for o u t p u t sign al s) in
the distinctive CAN profile a
s follows. The ECU
transmitting th
rough t he CAN_ H and CAN_L bus
line
s sends 2.5-3.5 V sig nals to th e CAN_H side and
2.5-1.5V sign
als to the CAN_L sid e . The receivin g
ECU read
s the dat a from the CAN_H and CAN_L
potential d
i f f e r ence . "Recessive" re fers to the st ate
whe
r e both CAN_H an d CAN_ L are u nder th e 2.5-V
st
ate, an d "Dominant" r e fers to the st ate where CAN_H is u nder the 3.5 - V st a t e and CAN_L is un der
the 1.5 - V st ate. By transforma t ion mainly to 2.5V ,
even in cases when volt age is rend ered 0 from fault y
ground ing o r the like (causing a prob lem of an
approximate 0.5 volt ag e incre a se on the co mmu nica
-
tions line), communication ca n be continued unint er-
rupted. Emplo y in g dua l co mmunicatio n s lines
imp
r oves reliability to pre v en t the pre s ence of noise,
comp
a r ed to t he co nven tion al communication
metho
d .
DAT A FRAMES
AC204754
ID region CRC
regionACK
region
Control
region Data region
Data Frames
AC204754AC
SOF
EOF
SOF (St a rt of Fra m e)
•Indi cat e s th e st art o f the fra m e
ID (I dentifier) regi on
•Iden tifies th e dat a content wh ile specifying prior-
ity rank in case of mediation
Cont rol re gion
•Specifies the frame type , dat a le ngth, e t c.
Data region
•Va lues used for d a t a con t rol, e t c.
Cyclic Redun dancy Che ck (CRC) reg i on
•Region wh er e to che c k fo r e r r o rs in se nt da t a , t h e
t
r a n s m it t i ng EC U ca l c u l at e s da t a re g i on s by
app
lying pre s cribed operations and stores the
result
s. The receiving ECU de tect s e rroneou s
communicatio
n by comp a r ing the CRC regio n
with
the da t a r egion .
ACK (Acknowledge) region
•Region where to co nform the reception of sent
dat
a
EOF(End of Fra m e)
•Indi ca tes th e end of the frame

SELF-DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)54C-6
ERROR DETECTION AND RECOVERY
CAN protocol secures its reliability of communication
by providing several error detection function such as
CRC shown in data frame, and the recovery function
(recovery is performed by resending, from abnormal
state such as transmission errors). If an error is
detected but it is not resolved even after recovery,
communication is stopped. This state is called "Bus
Off."
SELF-DIAGNOSIS
M2542000400280
•CAN self-diagnosis is performed by each ECU
connected to the CAN bus.
•diagnosis codes related to communication are
named with the capital letter U, and are called
"U-codes."
•A summary of the CAN self-diagnosis system is
presented below.
TIME-OUT
Each ECU transmits data frames periodically. If the
data frame is not received within the specified period,
the intended receiving ECU transmits a diagnosis
code indicating communication time-out for the ECU
that failed to transmit.
BUS OFF
Related to a communication error that persists even
after the transmitting ECU attempts recovery for a
specified number of attempts or that persists for a
specified period after recovery, communication is
stopped and this diagnostic code is issued.
FA I L U R E D ATA
When the transmitting ECU detects failure of a sen-
sor directly connected to it, this is the pertinent data
used to inform the ECU.
DATA LENGTH ERROR
When the number of data bytes received is different
from the prescribed number of bytes, this diagnosis
code is issued.
DYNAMIC RANGE ERROR
When the data received is more or less than the pre-
scribed range, this diagnosis code is issued.
CAN BUS DIAGNOSTICS
M2542000500179
As ECUs are connected via CAN bus (including
M.U.T.-III), always diagnose CAN bus to confirm its
normality when inspecting. Simply by performing
M.U.T.-III screen operations, the following inspec
-
tions can be performed automatically, and the result
can be used to verify the CAN bus status.
•Voltage measurement between the CAN_L and
CAN_H and the body earthing terminal
•Resistance measurement between the CAN_L
and CAN_H
•Confirmation of communication of all ECUs

GROUP 42
BODY
CONTENTS
GENERAL INFORMATION . . . . . . . .42-2
MAIN BODY . . . . . . . . . . . . . . . . . . . .42-3
BODY PANELING . . . . . . . . . . . . . . . . . . . . 42-3
BODY SHELL . . . . . . . . . . . . . . . . . . . . . . . 42-4
QUIETNESS . . . . . . . . . . . . . . . . . . . . . . . . 42-9
BODY COLOUR CHARTS . . . . . . . . . . . . . 42-9
HOOD <4G1> . . . . . . . . . . . . . . . . . . .42-10
STRUT TOWER BAR <4G1>. . . . . . .42-10
DOOR . . . . . . . . . . . . . . . . . . . . . . . . .42-11
DOOR LOCK . . . . . . . . . . . . . . . . . . . . . . . . 42-11
KEYLESS ENTRY SYSTEM . . . . . . . . . . . . 42-13
POWER WINDOW . . . . . . . . . . . . . . . . . . . 42-15
WEATHERSTRIP . . . . . . . . . . . . . . . . . . . . 42-17
PROTECTOR FILM. . . . . . . . . . . . . . .42-17
WINDOW GLASS . . . . . . . . . . . . . . . .42-18
SUNROOF. . . . . . . . . . . . . . . . . . . . . .42-20
LOOSE PANELS <4G1> . . . . . . . . . .42-22