Mitsubishi Colt Ralliart. Manual — part 274
AC313955AB
Explains about the basic
operation of the components.
Explains about
technical details.
Describes the
conditions for that
diagnosis code being
set.
Start of diagnosis
procedure
Describes possible
causes(s) for that
diagnosis code.
Describes
inspection
procedure.
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-9
CURRENT TROUBLE
Indicates that the status is "Active" and the trouble is
currently present. Carry out troubleshooting as
described in the applicable inspection procedure.
PAST TROUBLE
Indicates that the status is "Stored" and the trouble is
historic. Since the trouble may still be present, set
the vehicle to the diagnosis code detection condition
and check that the status changes to "Active". If the
status does not change from "Stored", observe the
applicable inspection procedure with particular
emphasis on connector(s) and wiring harness.
HARNESS CHECK
Check for an open or short circuit in the harness
between the terminals which are faulty according to
the connector measurements. Carry out this inspec-
tion while referring to the Electrical Wiring Manual.
Here, "Check the wiring harness between the power
supply and terminal xx" also includes checking for
blown fuse. For inspection service points when there
is a blown fuse, refer to "Inspection Service Points
for a Blown Fuse
MEASURES TO TAKE AFTER REPLAC-
ING THE ECU
If the trouble symptoms have not disappeared even
after replacing the ECU, repeat the inspection proce-
dure from the beginning.
Main
Index
Group
TOC
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-10
CONNECTOR MEASUREMENT SERVICE
POINTS
M1001013600397
CAUTION
During diagnosis, a diagnosis code associated
with other system may be set when the ignition
switch is turned on with connector(s) discon-
nected. On completion, confirm all systems for
diagnosis code(s). If diagnosis code(s) are set,
erase them all.
Turn the ignition switch to the "LOCK" (OFF) position
when connecting and disconnecting the connectors.
Turn the ignition switch to "ON" when measuring,
unless there are instructions to the contrary.
IF INSPECTING WITH THE CONNECTOR
CONNECTED <WATERPROOF CONNEC-
TORS>
CAUTION
Never insert a test probe from the harness side,
as this will reduce the waterproof performance
and result in corrosion.
AC105597AB
Special tool
Use the special tools such as test harness, harness
connector or check harness.
IF INSPECTING WITH THE CONNECTOR
CONNECTED <ORDINARY (NON-WATER-
PROOF) CONNECTORS>
AC105598AH
MB992006
Insert a test bar from the wiring harness side. If a test
bar cannot be inserted due to a too small pin cell
(e.g. control unit connector pins), use special tool
extra fine probe (MB992006). Never attempt to insert
the test bar into a too small pin cell forcibly.
IF INSPECTING WITH THE CONNECTOR
DISCONNECTED <WHEN INSPECTING A
FEMALE PIN>
CAUTION
• Use special tool check harness (MB991219). If
the test bar is inserted forcibly, it will cause a
poor contact.
•
AC105599
MB991219
AB
If the connector is disconnected, a diagnosis
code may be stored for the system to be
checked or other systems.
Use check harness (MB991219) of special tool har-
ness set (MB991223).
Main
Index
Group
TOC
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-11
IF INSPECTING WITH THE CONNECTOR
DISCONNECTED <WHEN INSPECTING A
MALE PIN>
CAUTION
• Be careful not to short the connector pins
with the test bars. To do so may damage the
circuits inside the ECU.
•
AC105600
If the connector is disconnected, a diagnosis
code may be stored for the system to be
checked or other systems.
Touch the pin directly with the test bar.
CONNECTOR INSPECTION SERVICE
POINTS
M1001013700026
VISUAL INSPECTION
•
AC300896AB
Connector disconnected or
improperly connected
Stretched or broken wires
Low contact
pressure
Harness wire breakage
at terminal section
Good
Bad
Connector is disconnected or improperly connected
• Connector pins are pulled out
• Due to harness tension at terminal section
• Low contact pressure between male and female
terminals
• Low connection pressure due to rusted terminals
or foreign matter lodged in terminals
Main
Index
Group
TOC
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-12
CONNECTOR PIN INSPECTION
AC300898
If the connector pin stopper is damaged, the terminal
connections (male and female pins) will not be per-
fect even if the connector body is connected, and the
pins may pull out of the reverse side of the connec-
tor. Therefore, gently pull the harnesses one by one
to make sure that no pins pull out of the connector.
CONNECTOR ENGAGEMENT INSPEC-
TION
AC300899AB
MB991219
Use special tool inspection harness (MB991219)
(connector pin connection pressure inspection har-
ness of the inspection harness set) to inspect the
engagement of the male pins and female pins. (Pin
drawing force: 1 N or more)
INSPECTION SERVICE POINTS FOR A
BLOWN FUSE
M1001013800023
CAUTION
A diagnosis code may be stored due to a blown
fuse.
AC300900AB
Battery
Fuse
Load
switch
Load
Short-circuit
occurrence
section
Remove the blown fuse and measure the resistance
between the load side of the blown fuse and the
earth. Close the switches of all circuits which are
connected to this fuse. If the resistance is almost 0
Ω
at this time, there is a short somewhere between
these switches and the load. If the resistance is not 0
Ω, there is no short at the present time, but a momen-
tary short has probably caused the fuse to blow.
The main causes of a short circuit are the following.
• Harness being clamped by the vehicle body
• Damage to the outer casing of the harness due to
wear or heat
• Water getting into the connector or circuitry
• Human error (mistakenly shorting a circuit, etc.)
Main
Index
Group
TOC
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