Mitsubishi Lancer Evolution IX. Manual — part 104
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-9
HOW TO USE THE INSPECTION PROCE-
DURES
The causes of many of the problems occurring in
electric circuitry are generally the connectors, com-
ponents, the ECU, the wiring harnesses between
connectors, in that order. These inspection proce-
dures follow this order. They first try to discover a
problem with a connector or a defective component.
AC301964 AB
Relevant circuit(s) of the component which
the Code No. indicates are described.
AC305342AD
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.
M.U.T.-ll/lll data list
PROCEDURE
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-10
HARNESS CHECK
Check for an open or short circuit in the harness
between the terminals which were 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
REPLACING THE ECU
If the trouble symptoms have not disappeared even
after replacing the ECU, repeat the inspection proce-
dure from the beginning.
CONNECTOR MEASUREMENT SERVICE
POINTS
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.
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-11
IF INSPECTING WITH THE CONNECTOR
CONNECTED
<Waterproof Connectors>
AC300881AD
MD998459
Be sure to use special tool harness connector
(MD998459). Never insert a test probe from the har-
ness side, as this will reduce the waterproof perform-
ance and result in corrosion.
<Ordinary (non-waterproof) Connectors>
AC105598AH
MB992006
Inspect by inserting a test probe from the harness
side. If the connector is too small to insert a test
probe (e.g. control unit connector), do not insert it
forcibly. Use special tool extra fine probe
(MB992006).
IF INSPECTING WITH THE CONNECTOR
DISCONNECTED
<When Inspecting a Female Pin>
ACX00865AB
MB991219
Use the special tool inspection harness (MB991219)
(inspection harness for connector pin contact pres-
sure in the harness set for inspection). The inspec-
tion harness for connector pin contact pressure
should be used. The test bar should never be forcibly
inserted, as it may cause a defective contact.
<When Inspecting a Male Pin>
AC300890
CAUTION
At this time, be careful not to short the connector
pins with the test bars. To do so may damage the
circuits inside the ECU.
Touch the pin directly with the test bar.
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-12
CONNECTOR INSPECTION SERVICE
POINTS
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
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
INSPECTION
AC300899AB
MB991219
Use the 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)
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