Mitsubishi Galant. Manual - part 199

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-21

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.

P0551

Power steering pressure sensor circuit range/performance

P.13B-355

P0705

Transmission range sen-
sor circuit malfunction
(PRNDL input)

•

A/T DTC No.27 (Park/Neutral position
switch system: Open circuit)

•

A/T DTC No.28 (Park/Neutral position
switch system: Short circuit)

P.13B-361

P0710

Transmission fluid tem-
perature sensor circuit
malfunction

•

A/T DTC No.15 (Oil temperature sensor
system: Open circuit)

•

A/T DTC No.16 (Oil temperature sensor
system: Short circuit)

P.13B-362

P0715

Input/turbine speed sen-
sor circuit malfunction

•

A/T DTC No.22 (Input shaft speed sensor
system)

P.13B-363

P0720

Output speed sensor cir-
cuit malfunction

•

A/T DTC No.23 (Output shaft speed sensor
system)

P.13B-364

P0725

Engine speed input cir-
cuit malfunction

•

A/T DTC No.21 (Crankshaft position sensor
system)

P.13B-365

P0740

Torque converter clutch
system malfunction

•

A/T DTC No.36 (Torque converter clutch so-
lenoid system: Short circuit/Open circuit)

•

A/T DTC No.52 (Torque converter clutch so-
lenoid system: Faulty system)

•

A/T DTC No.53 (Torque converter clutch so-
lenoid system: Lock-up stuck on)

P.13B-366

P0750

Shift solenoid A malfunc-
tion

•

A/T DTC No.31 (Low and reverse solenoid
valve system)

P.13B-367

P0755

Shift solenoid B malfunc-
tion

•

A/T DTC No.32 (Underdrive solenoid valve
system)

P.13B-368

P0760

Shift solenoid C malfunc-
tion

•

A/T DTC No.33 (Second solenoid valve sys-
tem)

P.13B-369

P0765

Shift solenoid D malfunc-
tion

•

A/T DTC No.34 (Overdrive solenoid valve
system)

P.13B-370

P1400

Manifold differential pressure sensor circuit malfunction

P.13B-372

P1500

Generator FR terminal circuit malfunction

P.13B-378

P1603

Battery backup circuit malfunction

P.13B-384

P1610

Immobilizer malfunction

P.13B-387

P1751

A/T control relay mal-
function

•

A/T DTC No.54 (A/T control relay system)

P.13B-388

DTC CODE

DIAGNOSTIC ITEMS

REFERENCE
PAGE

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-22

SYMPTOM CHART

M1131008800102

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.13B-390

Communication with PCM only is not possible

P.13B-392

Service engine
soon/
malfunction
indicator lamp
and related
parts

The service engine soon/malfunction indicator lamp
does not illuminate right after the ignition switch is
turned to the "ON" position

P.13B-395

The service engine soon/malfunction indicator lamp
remains illuminated and never goes out

P.13B-400

Starting

Cranks, won't start

P.13B-402

Starts up and dies

P.13B-408

Hard starting

P.13B-413

Idling stability
(improper
idling)

Unstable idle (rough idle, hunting)

P.13B-419

Idle speed is high (improper idle speed)

P.13B-423

Idle speed is low (improper idle speed)

P.13B-424

Idling stability
(engine stalls)

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

P.13B-426

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

P.13B-429

The engine stalls when accelerating (pass out)

P.13B-433

The engine stalls when decelerating

P.13B-434

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.13B-448

IM240 test
failure

Transient, mass emission tailpipe test failure

P.13B-450

Purge flow test of the evaporative emission canister
failure

P.13B-455

Pressure test of the evaporative system failure

P.13B-456

Generator output voltage is low (approximately 12.3 V)

P.13B-457

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

P.13B-461

Fans (Radiator fan, A/C condenser fan) are inoperative

P.13B-463

Power supply system and ignition switch-IG system

P.13B-466

Fuel pump system

P.13B-472

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-23

PROBLEM SYMPTOMS TABLE(FOR YOUR INFORMATION)

Ignition switch-ST system and park/neutral position switch system

P.13B-477

Ignition circuit system

P.13B-481

A/C system

P.13B-485

TROUBLE SYMPTOMS

INSPECTION
PROCEDURE

REFERENCE
PAGE

ITEMS

SYMPTOM

Starting

Won't start

The starter is used to crank the engine, but there is no combustion with-
in the cylinders, and the engine won't start.

Fires up and dies The engine starts, but then the 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 tachom-
eter pointer, and the vibration transmitted to the steering wheel, shift le-
ver, 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, re-
gardless 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) <3.0L>

13B-24

Driving

Hesitation Sag

" Hesitation " is the delay in re-
sponse of the vehicle speed (en-
gine 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 accelera-
tion

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

Stumble

Engine speed increase is delayed
when the accelerator pedal is ini-
tially depressed for acceleration.

Shock

The feeling of a comparatively large impact or vibration when the en-
gine 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 ham-
mer striking the cylinder walls. It adversely affects driving.

Stopping

(Run on) "Diesel-
ing"

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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