Mitsubishi Galant 9G. Manual - part 418

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

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GENERAL

00-10

CURRENT TROUBLE

Indicates that the trouble is currently present. Carry 
out troubleshooting as described in the applicable 
inspection procedure.

PAST TROUBLE

Indicates that the trouble is historic, but normal oper-
ation has been restored. Observe the applicable 
inspection procedure with particular emphasis on 
connector(s) and wiring harness.

HARNESS INSPECTION

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 GROUP 00E, Harness Con-
nector Inspection 

P.00E-2

. Here, "Check harness 

between power supply and terminal xx" also includes 
checking for blown fuse. For inspection service 
points when there is a blown fuse, refer to "Inspec-
tion Service Points for a Blown Fuse 

P.00-16

."

AC210616

(5) Explains about technical details.

(6) Describes the conditions for that DTC
      being set (stored). 

(8) Start of the diagnosis procedure
      for that DTC.

(10) Provides the inspection procedure
      for that DTC step by step.

(7) Describes possible 
      cause(s)for that DTC.

(9) Identifies the special tool(s)
     necessary for diagnosing that DTC.

AB

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

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GENERAL

00-11

MEASURES TO TAKE AFTER 
REPLACING THE PCM OR ECU

If the trouble symptoms have not disappeared even 
after replacing the PCM or ECU, repeat the inspec-
tion procedure from the beginning.

CONNECTOR MEASUREMENT SERVICE POINTS

M1001013600063

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 CONNECTORS>

Be sure to use special tool. Never insert a test probe from the 
harness side, as this will reduce the waterproof performance 
and result in corrosion.

IF INSPECTING WITH THE CONNECTOR 
CONNECTED <ORDINARY (NON-WATERPROOF) 
CONNECTORS>

Check by inserting the multi-meter test probe from the harness 
side. Note that if the connector (control unit, etc.) is too small to 
permit insertion of the test probe, it should not be forced; use 
the backprobing tool for this purpose.

ACX00863AE

SPECIAL TOOL

AC001606AB

CONNECTOR

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

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GENERAL

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IF INSPECTING WITH THE CONNECTOR 
DISCONNECTED <WHEN INSPECTING A 
FEMALE PIN>

Required Special Tool:

• MB991219: Inspection Harness (Included in MB991223, 

Harness Set)

• The special tool MB991219 for connector pin contact pres-

sure should be used. The test probe should never be forc-
ibly inserted, as it may cause a defective contact.

• From back side of the connector (SRS-ECU harness side 

connector)

• Since the SRS-ECU harness connector is plated to improve 

conductivity, observe the warning below when checking this 
connector.

WARNING

Insert the backprobing tool into the connector from 
the harness side, and connect the tester to the back-
probing tool. If any tool other than the backprobing 
tool is used, it may cause damage to the harness and 
other components. Furthermore, measurement 
should not be carried out by touching the backprob-
ing tool directly against the terminals from the front 
of the connector. The terminals are plated to increase 
their conductivity, so that if they are touched directly 
by the backprobing tool, the plating may break, which 
will decrease reliability. 

IF INSPECTING WITH THE CONNECTOR 
DISCONNECTED <WHEN INSPECTING A MALE 
PIN>

CAUTION

At this time, be careful not to short the connector pins with 
the test probes. Doing so may damage the circuits inside 
the ECU.
Touch the pin directly with the test probe.

ACX00865 AB

MB991219

AC001607

SRS-ECU HARNESS
CONNECTOR

AB

ACX00867 AB

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

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GENERAL

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CONNECTOR INSPECTION SERVICE  POINTS

M1001013700060

VISUAL INSPECTION

• Connector is disconnected or improperly connected

• Connector pins are pulled out

• Stretched an broken wires 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

If the connector pin stopper is damaged, the terminal connec-
tions (male and female pins) will not be perfect even when the 
connector body is connected, because the pins may pull out of 
the back side of the connector. Therefore, gently pull the wires 
one by one to make sure that no pins pull out of the connector.

.

ACX00868AC

CONNECTOR DISCONNECTED OR 
IMPROPERLY CONNECTED

STRETCHED OR BROKEN WIRES

HARNESS WIRE BREAKAGE
AT TERMINAL SECTION

LOW CONTACT
PRESSURE

GOOD

BAD

ACX00869AB