Mitsubishi Eclipse. Manual - part 371

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-27

NOTE: Do not replace the engine control module (ECM) <M/T> or powertrain control module (PCM) <A/T>
until a through terminal check reveals there are no short/open circuits.
NOTE: Check that the ECM <M/T> or PCM <A/T> ground circuit is normal before checking for the cause of
the problem.
NOTE: After the ECM <M/T> or PCM <A/T> 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.

SYMPTOM CHART

M1131151500641

NOTE: Check that the engine control module (ECM) <M/T> or powertrain control module (PCM) <A/T>
ground circuit is normal before checking for the cause of the problem.

P2229*

Barometric pressure circuit high input

P.13B-897

DTC CODE

DIAGNOSTIC ITEMS

REFERENCE
PAGE

SYMPTOMS

INSPECTION
PROCEDURE

REFERENCE
PAGE

Communication
with scan tool is
impossible

Communication with all systems is not possible

P.13B-908

Communication with ECM <M/T> or PCM <A/T> only
is not possible

P.13B-911

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.13B-916

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

P.13B-922

Starting

Cranks, won't start

P.13B-925

Starts up and dies

P.13B-932

Hard starting

P.13B-939

Idling stability
(improper idling)

Unstable idle (rough idle, hunting)

P.13B-946

Idle speed is high (improper idle speed)

P.13B-951

Idle speed is low (improper idle speed)

P.13B-953

Idling stability
(engine stalls)

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

P.13B-955

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

P.13B-959

The engine stalls when accelerating (pass out)

P.13B-964

The engine stalls when decelerating

P.13B-965

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-28

PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)

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-986

IM240 test failure

Transient, mass emission tailpipe test failure

P.13B-989

Purge flow test of the evaporative emission canister
failure

P.13B-996

Pressure test of the evaporative system failure

P.13B-997

Generator output voltage is low (approximately 12.3 volts)

P.13B-998

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

P.13B-1003

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

P.13B-1008

Power supply system and ignition switch-IG system

P.13B-1014

Fuel pump system

P.13B-1030

Ignition switch

− ST system <M/T>

P.13B-1043

Ignition switch-ST system and transmission range switch system <A/T>

P.13B-1049

Ignition circuit system

P.13B-1053

A/C system

P.13B-1060

SYMPTOMS

INSPECTION
PROCEDURE

REFERENCE
PAGE

ITEMS

SYMPTOM

Starting

Won't start

The starter is used to crank 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 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
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) <3.0L>

13B-29

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 or
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 like a hammer striking the cylinder walls.

Stopping

Dieseling (run
on)

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-30

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC P0101: Volume Airflow Circuit Range/Performance Problem

AK301583

43
50

42
49

41
48
60 61

46 47
58 59
67 68

56
66

1 2 3 4 5 6 7

RED

RED-

WHITE

RED-

WHITE

RED-

WHITE

GREEN-BLUE

WHITE-GREEN

B-14

BATTERY

VOLUME AIRFLOW
SENSOR

5 V

19<M/T>*1
19<A/T>*3

ENGINE CONTROL MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL MODULE (PCM) <A/T>

MFI
RELAY

34<M/T>*1
16<A/T>*3

61<M/T>*2
65<A/T>*4

C-51 <M/T>, C-52 <A/T>
(MU803784)

C-58 <M/T>
(MU803782)

C-55 <A/T>
(MU803781)

NOTE
*1: ECM connector C-51 <M/T>
*2: ECM connector C-58 <M/T>
*3: PCM connector C-52 <A/T>
*4: PCM connector C-55 <A/T>

3 4

5 6

7 8

11 12 13 14 15 16 17 18 19 20

21 22 23

24 25

26 27 28 29

3132 33

34 35

42 43
48 49 50 51 52 53 54 55 56 57

58 59

60 61 62 63

64 65 66

Volume Airflow Sensor Circuit

3 4

1 2

A-18X

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