ECU MITSUBISHI 380 2005 Workshop Manual

HOW TO USE THIS MANUAL
GENERAL00-3
HOW TO USE THIS MANUALM1001000100897
MAINTENANCE, REPAIR AND
SERVICING EXPLANATIONS
This manual provides explanations, etc. concerning
procedures for the inspection, maintenance, repair
and servicing of the subject model. Unless otherwise
specified, each service procedure covers all models.
Procedures covering specific models are identified
by the model codes, or similar designation (engine
type, transaxle type, etc). A description of these des-
ignations is covered in this manual under "VEHICLE
IDENTIFICATION."
.
ON-VEHICLE SERVICE
The "ON-VEHICLE SERVICE" section has proce-
dures for performing inspections and adjustments of
particularly important components. These proce-
dures are done with regard to maintenance and ser-
vicing, but other inspections (looseness, play,
cracking, damage, etc.) must also be performed.
.
SERVICE PROCEDURES
The service steps are arranged in numerical order.
Attention to be paid in performing vehicle service are
described in detail in SERVICE POINTS.
DEFINITION OF TERMS
.
STANDARD VALUE
Indicates the value used as the standard for judging
whether or not a part or adjustment is correct.
.
LIMIT
Shows the maximum or minimum value for judging
whether or not a part or adjustment is acceptable.
.
REFERENCE VALUE
Indicates the adjustment value prior to starting the
work (presented in order to facilitate assembly and
adjustment procedures, and so they can be com-
pleted in a shorter time).
.
DANGER, WARNING, AND CAUTION
DANGER, WARNING, and CAUTION call special
attention to a necessary action or to an action that
must be avoided. The differences among DANGER,
WARNING, and CAUTION are as follows:
If a DANGER is not followed, the result is severe
bodily harm or even death.
If a WARNING is not followed, the result could be
bodily injury.
If a CAUTION is not followed, the result could be
damage to the vehicle, vehicle components or
service equipment.
TIGHTENING TORQUE INDICATION
The tightening torque indicates a median and its tol-
erance by a unit of N
m (in-lb.) or Nm (ft.-lb.). For
fasteners with no assigned torque value, refer to
P.00-32.
SPECIAL TOOL NOTE
Only MMC special tool part numbers are called out in
the repair sections of this manual. Please refer to the
special tool cross-reference chart located at the
beginning of each group, for the special tool number
that is available in your market.
ABBREVIATIONS
The following abbreviations are used in this manual
for classification of model types:
A/T:Automatic transaxle, or models equipped with
automatic transaxle.
MPI: Multipoint fuel injection, or engines equipped
with multiport fuel injection.
A/C: Air conditioning.
3.8L engine: 3.8 litre <6G75> engine, or a model
equipped with such an engine.
ABS: Anti-lock Braking System
TCL: Traction Control System
ECU: Electronic Control Unit
V.C.I.: Vehicle Communication Interface
SWS: Simplified Wiring System
CAN: Controller Area Network
M/T: Manual Transmission
SRS: Supplemental Restraint System

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL00-7
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE
POINTS
TROUBLESHOOTING CONTENTSM1001013300062
During diagnosis, a DTC 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 DTC code(s). If DTC code(s) are set, erase
them all.
When the DIAGNOSTIC TOOL (MUT-III)
detects a diagnostic trouble code, its display
informs users whether a mechanical problem
currently exists (“current trouble”) or whether
it existed before but normal operation has
been restored (“past trouble”). However, if an
MPI, TPMS or SRS airbag-related DTC is set,
“Active DTC/Stored DTC” is not displayed. In
this case, follow the diagnosis procedure for
current trouble.
If a trouble, detected in a CAN communica-
tion-capable system, can be reproduced,
diagnose the CAN bus lines (Refer to GROUP
54C, Can Bus Line Diagnostics Chart
P.54C-15 or P.54C-15).
Troubleshooting of electronic control systems for
which the MUT -III can be used follows the basic out-
line described below. Even in systems for which the
MUT-III cannot be used, part of these systems still
follow this outline.
1. STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING
Troubleshooting strategy is shown in each group.
2. SYSTEM OPERATION AND SYMPTOM
VERIFICATION TESTS
If verification of the symptom(s) is difficult, proce-
dures for checking operation and verifying symptoms
are shown.
3. DIAGNOSTIC FUNCTION
The following trouble code diagnoses are shown.
How to read diagnostic trouble codes
How to erase diagnostic trouble codes
Input inspection service points
4. DIAGNOSTIC TROUBLE CODE CHART
If the MUT-III displays a diagnostic trouble code, find
the applicable inspection procedure according to this
chart.
5. SYMPTOM CHART
If there are symptoms, even though the MUT-III
shows that no DTCs are set, inspection procedures
for each symptom will be found by using this chart.
6. DIAGNOSTIC TROUBLE CODE
PROCEDURES
Indicates the inspection procedures corresponding to
each diagnostic trouble code. (Refer to P.00-9).
7. SYMPTOM PROCEDURES
Indicates the inspection procedures corresponding to
each symptom listed in the Symptom Chart (Refer to
P.00-9).
8. SERVICE DATA REFERENCE TABLE
Inspection items and normal judgment values have
been provided in this chart as reference information.
9. CHECK AT ECU TERMINALS
Terminal numbers for the ECU connectors, inspec-
tion items, and standard values have been provided
in this chart as reference information.
.
TERMINAL VOLTAGE CHECKS
1. Use correct tool to check each pin location on the
ENGINE-ECU Check harnes MB992044 and
measure with voltmeter.
Short-circuiting the positive (+) test probe
between a connector terminal and ground could
damage the vehicle wiring, the sensor, the ECU,
or all three. Use care to prevent this!
2. Insert the correct terminal tool into each of the
ENGINE-ECU check harness connector
terminals, and measure the voltage while referring
to the check chart.
NOTE: Measure voltage with the ECU connectors
connected.
You may find it convenient to pull out the ECU to
make it easier to connect the ENGINE-ECU check
harness.

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL00-8
Checks don't have to be carried out in the order
given in the chart.
3. If voltage readings differ from normal condition
values, check related sensors, actuators, and
wiring. Replace or repair as needed.
4. After repair or replacement, recheck with the
voltmeter to confirm that the repair has corrected
the problem.
.
TERMINAL RESISTANCE AND
CONTINUITY CHECKS
1. Turn the ignition switch to the “LOCK” (OFF)
position.
2. Disconnect the ECU connector.
If resistance and continuity checks are per-
formed on the wrong terminals, damage to the
vehicle wiring, sensors, ECU, and/or ohmmeter
may occur. Use care to prevent this!
3. Measure the resistance and check for continuity
between the terminals of the ENGIN-ECU check
harness MB992044 connector while referring to
the check chart.
NOTE: Checks don't have to be carried out in the
order given in the chart.
4. If the ohmmeter shows any deviation from the
Normal Condition value, check the corresponding
sensor, actuator and related electrical wiring, then
repair or replace.
5. After repair or replacement, recheck with the
ohmmeter to confirm that the repair has corrected
the problem.
10. INSPECTION PROCEDURES USING
AN OSCILLOSCOPE
When there are inspection procedures using an
oscilloscope, these are listed.

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL00-9
HOW TO USE THE INSPECTION PROCEDURESM1001013500066
The causes of many of the problems occurring in electric circuitry are generally the connectors, components,
the ECU, and the harnesses between connectors, in that order. These inspection procedures follow this
order. They first try to discover a problem with a connector or a defective component.
DTC P0202: Injector Circuit Malfunction - Cylinder 2.

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL00-11
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 POINTSM1001013600063
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
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 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 test probe tool for this purpose.

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
GENERAL00-12
IF INSPECTING WITH THE CONNECTOR
DISCONNECTED 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.
Insert the test probe tool into the connector from the
harness side, and connect the tester to the test probe
tool. If any tool other than the test probe tool is used,
it may cause damage to the harness and other com-
ponents. Furthermore, measurement should not be
carried out by touching the test probe tool directly
against the terminals from the front of the connector.
The terminals are plated to increase their conductiv-
ity, so that if they are touched directly by the test
probe tool, the plating may break, which will decrease
reliability.
IF INSPECTING WITH THE CONNECTOR
DISCONNECTED PIN>
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.

AFFILIATED DTC REFERENCE TABLE
GENERAL00-17
AFFILIATED DTC REFERENCE TABLEM1001013000027
For vehicles with CAN, when DTC which influences
the transmission data is set to the ECU which sends
the data, DTC also could be set to the ECU which
receives and controls the transmission data. The
table below shows the relativity of DTC between
ECUs.
AFFILIATED
DTC’s RESULTS
P0513 P2138 TBA U1120 U1100 U1110
U1120 X - X - - -
U1100 - - - - - -
U1120 X X X X - X
U1110 - - - - - -
TBA - - - - - -

PRECAUTIONS BEFORE SERVICE
GENERAL00-22
ENGINE MODEL STAMPING
The engine model is stamped on the cylinder block.
The engine model number is as shown as follow.
The engine serial number is stamped near the engine model
number.
PRECAUTIONS BEFORE SERVICE
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)M1001011600056
1. Items to review when servicing SRS:
(1) Be sure to read GROUP 52B, Supplemental
Restraint System (SRS). For safe operation,
please follow the directions and heed all
warnings.
(2) Wait at least 60 seconds after disconnecting
the battery cable before doing any further
work. The SRS system is designed to retain
enough voltage to deploy the air bag even
after the battery has been disconnected.
Serious injury may result from unintended air
bag deployment if work is done on the SRS
system immediately after the battery cable is
disconnected.
(3) Warning labels must be heeded when
servicing or handling SRS components.
Warning labels can be found in the following
locations.
Front impact sensor
Hood
Sun visor
Instrument panel (passenger ’s side)
SRS-ECU
Steering wheel
Clock spring
Air bag module (Driver's or front
passenger's)
Side-airbag module (Driver's side or front
passenger's side)
Side impact sensor
Seat belt pre-tensioner
(4) Always use the designated special tools and
test equipment.(5) Store components removed from the SRS in a
clean and dry place. The air bag module
should be stored on a flat surface and placed
so that the pad surface is facing upward.
(6) Never attempt to disassemble or repair the
SRS components (SRS-ECU, air bag module
and clock spring). If there is a defect, replace
the defective part.
(7) Whenever you finish servicing the SRS, check
the SRS warning light operation to make sure
that the system functions properly.
(8) Be sure to deploy the air bag before disposing
of the air bag module or disposing of a vehicle
equipped with an air bag (Refer to GROUP
52B, Air Bag Module Disposal Procedures
P.52B-254).
2. Observe the following when carrying out
operations on places where SRS components are
installed, including operations not directly related
to the SRS air bag.
(1) When removing or installing parts, do not allow
any impact or shock to occur to the SRS
components.
(2) If heat damage may occur during paint work,
remove the SRS-ECU, the air bag module,
clock spring, the front impact sensor, the side
impact sensor, and the seat belt pre-tensioner.
a.SRS-ECU, air bag module, clock spring,
front impact sensor, the side impact sensor:
93
C (200F) or more
b.Seat belt pre-tensioner: 90
C (194F) or
more ENGINE MODEL ENGINE DISPLACEMENT
6G75 3828cc

PRECAUTIONS BEFORE SERVICE
GENERAL00-23
HOW TO PERFORM VEHICLE IDENTIFICATION
NUMBER (VIN) WRITING
M1001011400063
The Vehicle Identification Number (VIN) is stored in the ECU by
the vehicle manufacture. If the VIN to be stored in the ECU is
eliminated fraudulently, the Malfunction Indicator Lamp (Check
Engine Lamp) illuminates and Diagnostic Trouble Code (DTC)
No.P0630 (VIN malfunction) is shown. When the ECU is
replaced, and entry of the VIN necessary due to DTC No.
P0630 (VIN malfunction). Enter the VIN in accordance with the
procedure as follows:
.
WRITING PROCEDURE
Required Special Tools:
Diagnostic Tool (MUT-III)
MB991824: V.C.I.
MB991827: MUT-III USB Cable
MB991910: MUT-III Main Harness A (BLUE)
To prevent damage to DIAGNOSTIC TOOL (MUT-III), always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting.
1. Connect Diagnostic Tool to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Confirm DTC No.P0630 (EEPROM malfunction) is not
shown.
NOTE: When DTC No. P0630 (EEPROM malfunction) is
shown, the VIN cannot be stored even if entered. Therefore,
the troubleshooting is performed when this DTC is shown.
4. Select "Coding" form the menu screen.
5. Select "VIN writing" form the menu screen.
6. Enter the VIN.
7. After entry of the VIN, turn the ignition switch to the "LOCK"
(OFF) position. After ten seconds or more passed, turn to
the "ON" position again.
8. Confirm DTC No.P0630 (VIN malfunction) is not shown.
NOTE: When DTC No.P0630 (VIN malfunction) is shown,
enter the VIN again because that would be not appropriate.

TOWING AND HOISTING
GENERAL00-27
TOWING WITH REAR WHEELS OFF THE
GROUND (TYPE B)
Place the gearshift lever in the "Neutral" position (M/T) or the
selector lever in the "N" (NEUTRAL) position (A/T). Turn the
ignition key to the "ACC" position and secure the steering
wheel in a straight-ahead position with a rope or tie-down strap.
Never place the ignition key in the "LOCK" position when tow-
ing.
Never tow an A/T vehicle with the rear wheels up (and
the front wheels on the ground) when the automatic
transmission fluid level is low. this may cause serious
and expensive damage to the transmission.
Do not use the steering column lock to secure the front
wheels for towing.
Make sure the transaxle is in Neutral if vehicle will have
drive wheels on the ground.
If these requirements cannot be met, the front wheels
must be placed on a tow dolly.
.
TOWING WHEN KEYS ARE NOT AVAILABLE
When a locked vehicle must be towed and keys are not avail-
able, the vehicle may be lifted and towed from the front, pro-
vided the parking brake is released. If not released, the rear
wheels should be placed on a tow dolly.
.
SAFETY PRECAUTIONS
The following precautions should be taken when towing the
vehicle:
1. DO NOT LIFT OR TOW THE VEHICLE BY ATTACHING
TO OR WRAPPING AROUND THE BUMPER.
2. Any loose, protruding, or damaged parts such as hoods,
doors, fenders, trim, etc. should be secured or removed
prior to moving the vehicle.