Mitsubishi Grandis. Manual — part 401
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-10
IF INSPECTING WITH THE CONNECTOR
CONNECTED <WATERPROOF
CONNECTORS>
CAUTION
Never insert a test probe from the harness side,
as this will reduce the waterproof performance
and result in corrosion.
Use the special tools such as test harness, harness
connector or check harness.
IF INSPECTING WITH THE CONNECTOR
CONNECTED <ORDINARY
(NON-WATERPROOF) CONNECTORS>
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 the probe
(MB991222) of the special tool Harness Set
(MB991223). 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 the special tool Check Harness
(MB991219). If the test bar is inserted forcibly,
it will cause a poor contact.
• If the connector is disconnected, a diagnosis
code may be stored for the system to be
checked or other systems.
Use the Check Harness (MB991219) of the special
tool Harness Set (MB991223).
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.
• 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.
AC105597AB
Special tool
AC105598
MB991222
AB
AC105599
MB991219
AB
AC105600
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-11
CONNECTOR INSPECTION SERVICE
POINTS
VISUAL INSPECTION
•
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
If the connector pin stopper is damaged, the terminal
connections (male and female pins) will not be
perfect even if the connector body is connected, and
the pins may pull out of the reverse side of the
connector. Therefore, gently pull the harnesses one
by one to make sure that no pins pull out of the
connector.
CONNECTOR ENGAGEMENT
INSPECTION
Use special tool inspection harness (MB991219)
(connector pin connection pressure inspection
harness of the inspection harness set) to inspect the
engagement of the male pins and females pins. (Pin
drawing force: 1 N or more)
AC300896AB
Connector disconnected or
improperly connected
Stretched or broken wires
Low contact
pressure
Harness wire breakage
at terminal section
Good
Bad
AC300898
AC300899AB
MB991219
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL
00-12
INSPECTION SERVICE POINTS FOR A
BLOWN FUSE
CAUTION
A diagnosis code may be stored due to a blown
fuse.
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
momentary 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.)
HOW TO COPE WITH INTERMITTENT
MALFUNCTIONS
Intermittent malfunctions often occur under certain
conditions, and if these conditions can be
ascertained, determining the cause becomes simple.
In order to ascertain the conditions under which an
intermittent malfunction occurs, first ask the
customer for details about the driving conditions,
weather conditions, frequency of occurrence and
trouble symptoms, and then try to recreate the
trouble symptoms. Next, ascertain whether the
reason why the trouble symptom occurred under
these conditions is due to vibration, temperature or
some other factor. If vibration is thought to be the
cause, carry out the following checks with the
connectors and components to confirm whether the
trouble symptom occurs. The objects to be checked
are connectors and components which are indicated
by inspection procedures or given as probable
causes (which generates diagnosis codes or trouble
symptoms).
AC300900AB
Battery
Fuse
Load
switch
Load
Short-circuit
occurrence
section
AC300901
VEHICLE IDENTIFICATION
GENERAL
00-13
• Gently shake the connector up, down and to the
left and right.
• Gently shake the wiring harness up, down and to
the left and right.
• Gently rock each sensor and relay, etc. by hand.
• Gently shake the wiring harness at suspensions
and other moving parts.
NOTE: If determining the cause is difficult, the drive
recorder function of the MUT-III can also be used.
(For details on how to use the MUT-III, refer to the
"MUT-III operation manual).
HOW TO TREAT PAST TROUBLE
1. Establish from the customer whether a fuse or
connector has been replaced or disconnected.
2. If yes, erase the diagnosis code, and then check
that no diagnostic code is reset. If no diagnosis
code is reset, the diagnosis is complete.
3. If no, follow the applicable Diagnostic Trouble
Code Chart. Then check the wiring harness and
connector, and refer to "How to Cope with
Intermittent Malfunction ."
VEHICLE IDENTIFICATION
M1001000400768
VEHICLE IDENTIFICATION CODE PLATE
The vehicle information code plate is riveted to the
back of the hood.
• The plate shows model code, engine model,
transmission model and body colour code.
• For monotone colour vehicles, the body colour
code shall be indicated.
MODELS
MODEL CODE
AC310096
Hood
AC
1
2
3
4
5
6
7
No. Item
Content
1
MODEL
NA4W
Vehicle model
LNHYL6
Model series
2
ENGINE
4G69
Engine model
3
EXT
W32A
Exterior code
4
TRANS
AXLE
F5M42
Transmission model
5
COLOR
W32
Body colour code
6
INT
22T
Interior code
7
OPT
Z36
Equipment code
Model code
Engine model
Transmission model
Fuel supply
system
NA4W
LNUYL6/R6
4G69-SOHC-MIVEC
(2,378 mL)
F5M42 <2WD, 5M/T>
MPI
LRUYL6/R6
F4A4B <2WD, 4A/T with sport mode>
LNHYL6/R6
F5M42 <2WD, 5M/T>
LRHYL6/R6
F4A4B <2WD, 4A/T with sport mode>
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