Mitsubishi Montero Sport (2004+). Manual - part 154

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-29

NOTE: Do not replace the powertrain control module (PCM) until a through terminal check reveals there are
no short/open circuits.
NOTE: Check that the PCM ground circuit is normal before checking for the cause of the problem.
NOTE: After the PCM detects a malfunction, a diagnostic trouble code is recorded the next time the engine is
started and the same malfunction is re-detected. However, for items marked with a "*", the diagnostic trouble
code is recorded on the first detection of the malfunction.
NOTE: Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the
sensor mounted at the position second closest to the engine.
NOTE: Bank 1 indicates the right bank side cylinder, and Bank 2 indicates the left bank side cylinder.

P0768

Shift solenoid "D"
electrical

• A/T DTC No. 34 (Overdrive solenoid valve

system: Short circuit/Open circuit)

P.23A-39

P1603*

Battery backup circuit malfunction

P.13A-679

P1751

A/T control relay
malfunction

• A/T DTC No. 54 (A/T control relay system:

Short circuit to ground /open circuit)

P.23A-39

P2227*

Barometric pressure circuit range/performance problem

P.13A-684

P2228*

Barometric pressure circuit low input

P.13A-692

P2229*

Barometric pressure circuit high input

P.13A-707

DTC CODE

DIAGNOSTIC ITEMS

REFERENCE
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-30

SYMPTOM CHART

M1131151500704

NOTE: Check that the PCM ground circuit is normal before checking for the cause of the problem.

TROUBLE SYMPTOMS

INSPECTION
PROCEDURE

REFERENCE PAGE

Communication
with scan tool is
impossible

Communication with all systems is not possible

P.13A-716

Communication with PCM only is not possible

P.13A-719

Malfunction
Indicator Lamp
(SERVICE
ENGINE SOON
or Check
Engine Lamp)
and related
parts

The malfunction indicator lamp (SERVICE ENGINE
SOON or check engine lamp) does not illuminate right
after the ignition switch is turned to the "ON" position

P.13A-723

The malfunction indicator lamp (SERVICE ENGINE
SOON or check engine lamp) remains illuminated and
never goes out

P.13A-728

Starting

Cranks, won't start

P.13A-731

Starts up and dies

P.13A-737

Hard starting

P.13A-743

Idling stability
(improper
idling)

Unstable idle (rough idle, hunting)

P.13A-748

Idle speed is high (improper idle speed)

P.13A-753

Idle speed is low (improper idle speed)

P.13A-755

Idling stability
(engine stalls)

When the engine is cold, it stalls at idle (die out)

P.13A-757

When the engine is hot, it stalls at idle (die out)

P.13A-761

The engine stalls when accelerating (pass out)

P.13A-766

The engine stalls when decelerating

P.13A-767

Driving

Hesitation, sag or stumble

Acceleration shock

Deceleration shock

Poor acceleration

Surge

Knocking

Dieseling (Run-on)

Too high CO and HC concentration when idling

P.13A-787

IM240 test
failure

Transient, mass emission tailpipe test failure

P.13A-790

Purge flow test of the evaporative emission canister
failure

P.13A-798

Pressure test of the evaporative system failure

P.13A-799

Improper idle speed when the A/C is operating (A/C switch 2 signal)

P.13A-800

A/C condenser fan is inoperative

P.13A-802

Power supply system and ignition switch-IG system

P.13A-804

Fuel pump system

P.13A-813

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-31

PROBLEM SYMPTOMS TABLE(FOR YOUR INFORMATION)

Ignition switch

− ST system and transmission range switch system

P.13A-821

Ignition circuit system

P.13A-828

A/C system

P.13A-837

TROUBLE SYMPTOMS

INSPECTION
PROCEDURE

REFERENCE PAGE

ITEMS

SYMPTOM

Starting

Won't start

The starter cranks the engine, but there is no combustion within the
cylinders, and the engine won't start.

Starts up and
dies

The engine starts, but then engine soon stalls.

Hard starting

Engine starts after cranking a while.

Idling stability

Hunting

Engine speed doesn't remain constant; changes at idle.

Rough idle

Usually, a judgement can be based upon the movement of the
tachometer pointer, and the vibration transmitted to the steering wheel,
shift lever, body, etc.

Incorrect idle
speed

The engine doesn't idle at the usual correct speed.

Engine stall (die
out)

The engine stalls when the foot is taken from the accelerator pedal,
regardless of whether the vehicle is moving or not.

Engine stall
(pass out)

The engine stalls when the accelerator pedal is depressed or while it is
being used.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-32

Driving

Hesitation Sag

" Hesitation " is the delay in
response of the vehicle speed
(engine speed). This occurs when
the accelerator is depressed in
order to accelerate from the speed
at which the vehicle is now
traveling, or a temporary drop in
vehicle speed (engine speed)
during such acceleration.
Serious hesitation is called " sag. "

Poor
acceleration

Poor acceleration is inability to obtain an acceleration corresponding to
the degree of throttle opening, even though acceleration is smooth. The
inability to reach maximum speed.

Stumble

Engine speed increase is delayed
when the accelerator pedal is
initially depressed for acceleration.

Shock

The feeling of a comparatively large impact or vibration when the
engine is accelerated or decelerated.

Surge

This is slight acceleration and deceleration feel usually felt during
steady, light throttle cruise. Most notable under light loads.

Knocking

A sharp sound during driving usually work aloud. It sounds like a
hammer striking the cylinder walls. It adversely affects driving.

Stopping

Run on
("Dieseling ")

The condition in which the engine continues to run after the ignition
switch is turned to the " LOCK " (OFF) position. Also called " dieseling. "

ITEMS

SYMPTOM

AKX01361

VEHICLE
SPEED

TIME

NORMAL

HESITATION

SAG

INITIAL
ACCELE-
RATOR
PEDAL
DEPRE-
SSION

AKX01361AB

AKX01362

VEHICLE
SPEED

TIME

NORMAL

STUMBLE

INITIAL
ACCEL-
ERATOR
PEDAL
DEP-
RESSION

IDLING

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