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 

P.00-12

."

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.

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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).

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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

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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.)

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