Mitsubishi Eclipse. Manual — part 638

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1095

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Examples of Abnormal Wave Patterns
Example 1 (Wave pattern during engine cranking)

• Cause of problem

Open-circuit in ignition primary circuit

• Wave pattern characteristics

Top-right part of the build-up section cannot be seen, and
voltage value is approximately 2 volts too low.

Example 2 (Wave pattern during engine cranking)

• Cause of problem

Malfunction in ignition power transistor

• Wave pattern characteristics

Power voltage results when the ignition power transistor is
ON.

CONDITION OF WAVE PATTERN
BUILD-UP SECTION AND
MAXIMUM VOLTAGE

PROBABLE CAUSE

Rises from approximate 2 volts to
approximate 4.5 volts at the top-right

Normal

2-volt rectangular wave

Open-circuit in ignition
primary circuit

Rectangular wave at power voltage

Ignition power
transistor malfunction

AKX01612

NORMAL WAVE
PATTERN

2V

AB

AKX01613

BATTERY
POSITION
VOLTAGE

NORMAL WAVE
PATTERN

AB

SPECIAL TOOLS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1096

SPECIAL TOOLS

M1131000600535

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991958
A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: MB991826
MUT-III sub assembly
A: Vehicle
Communication Interface
(V.C.I.)
B: MUT-III USB Cable
C: MUT-III Main Harness
A (Vehicles with CAN
communication system)
D: MUT-III Main Harness
B (Vehicles without CAN
communication system)
E: MUT-III Main Harness
C (for Chrysler models
only)
F: MUT-III Adapter
Harness
G: MUT-III Trigger
Harness

• Reading diagnostic

trouble code

• MFl system inspection

• Measurement of fuel

pressure

CAUTION

For vehicles with CAN
communication, use
MUT-III main harness A
to send simulated
vehicle speed. If you
connect MUT-III main
harness B instead, the
CAN communication
does not function
correctly.

MB991348
Test harness set

General Service Tool
(Jumpers) 8468

• Adjustment of throttle

position sensor

• Inspection using an

oscilloscope

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE

MB991348

SPECIAL TOOLS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1097

MB991709
Test harness set

General Service Tool
(Jumpers) 8469

• Inspection using an

oscilloscope

• Inspection of idle air

control motor

MB991658
Test harness set

General Service Tool
(Jumpers) 8467

Inspection of heated
oxygen sensor

MD998464
Test harness (4 pin,
square)

General Service Tool
(Jumpers)

• Inspection of heated

oxygen sensor

• Inspection using an

oscilloscope

MB991316
Test harness (4 pin,
square)

General Service Tool
(Jumpers)

• Inspection of heated

oxygen sensor

MD998478
Test harness (3 pin,
triangle)

General Service Tool
(Jumpers)

Inspection using an
oscilloscope

MD998709
Adaptor hose

-

Measurement of fuel
pressure

MD998742
Hose adaptor

MD998742

MB991637
Fuel pressure gauge set

-

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991658

MB991637

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1098

ON-VEHICLE SERVICE

COMPONENT LOCATION

M1131002100752

NAME

SYMBOL

NAME

SYMBOL

A/C compressor relay

M

Injector

H

Crankshaft position sensor

N

Knock sensor

E

Data link connector

W

Left bank heated oxygen sensor
(front)

P

Distributor (built-in camshaft position
sensor and ignition coil)

L

Left bank heated oxygen sensor
(rear)

O

EGR vacuum regulator solenoid
valve <without variable induction
system>

B

Manifold absolute pressure sensor

G

EGR vacuum regulator solenoid
valve <with intake manifold tuning
system>

C

Multiport fuel injection (MFI) relay

M

Engine control module (ECM) <M/T> X

Transmission range switch <A/T>

T

Engine coolant temperature sensor

S

Powertrain control module <A/T>

X

Engine speed detection connector

M

Power steering pressure switch

A

Evaporative emission purge
solenoid <without variable induction
system>

B

Right bank heated oxygen sensor
(front)

D

Evaporative emission purge
solenoid <with intake manifold
tuning system>

K

Right bank heated oxygen sensor
(rear)

F

Evaporative emission ventilation
solenoid

Z

Fan controller

Q

Fuel tank differential pressure
sensor

Y

Intake manifold tuning solenoid
<with variable induction system>

C

Fuel pump module (Fuel tank
temperature sensor)

Y

Vehicle speed sensor

R

Fuel pump relay 1, 2

V

Volume airflow sensor (with built-in
intake air temperature sensor and
barometric pressure sensor)

U

Idle air control motor

J

Throttle position sensor

I