Mitsubishi Galant 9G. Manual - part 649

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-38

SYMPTOM CHART

M1131151500760

CAUTION

During diagnosis, a DTC associated with other 
system may be set when the ignition switch is 
turned on with connector(s) disconnected. On 
completion, confirm all systems for DTCs. If 
DTCs are set, erase them all.

CAUTION

Disconnecting the battery cables or removing the 
combination meter will erase the learned value of 
the fuel gauge. To recover the learned value, 
input a vehicle speed (by actually driving the 
vehicle or inputting a simulated vehicle speed), 
and stop the vehicle. This will complete the learn-
ing process.

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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

1

P.13A-967

Communication with PCM only is not possible

2

P.13A-970

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

3

P.13A-973

The Malfunction Indicator Lamp (SERVICE ENGINE 
SOON or Check Engine Lamp) remains illuminated 
and never goes out

4

P.13A-974

Starting

Cranks, won't start

5

P.13A-976

Starts up and dies

6

P.13A-981

Hard starting

7

P.13A-986

Idling stability 
(improper 
idling)

Unstable idle (rough idle, hunting)

8

P.13A-991

Idle speed is high (improper idle speed)

9

P.13A-995

Idle speed is low (improper idle speed)

10

P.13A-997

Idling stability 
(engine stalls)

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

11

P.13A-999

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

12

P.13A-1002

The engine stalls when accelerating (pass out)

13

P.13A-1005

The engine stalls when decelerating

14

P.13A-1007

Driving

Hesitation, sag or stumble

15

P.13A-1009

Acceleration shock

16

P.13A-1013

Deceleration shock

17

P.13A-1014

Poor acceleration

18

P.13A-1015

Surge

19

P.13A-1018

Knocking

20

P.13A-1022

Dieseling (Run-on)

21

P.13A-1024

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-39

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PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)

Too high CO and HC concentration when idling

22

P.13A-1024

IM240 test 
failure

Transient, mass emission tailpipe test failure

23

P.13A-1027

Purge flow test of the evaporative emission canister 
failure

24

P.13A-1034

Pressure test of the evaporative system failure

25

P.13A-1035

Generator output voltage is low (approximately 12.3 volts)

26

P.13A-1036

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

27

P.13A-1040

Power supply system and ignition switch-IG system

28

P.13A-1043

Fuel pump system

29

P.13A-1054

Ignition switch-ST system and transmission range switch system

30

P.13A-1068

Ignition circuit system

31

P.13A-1073

A/C system

32

P.13A-1081

TROUBLE SYMPTOMS

INSPECTION 
PROCEDURE

REFERENCE PAGE

ITEMS

SYMPTOM

At 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 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.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-40

At 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. 
Also 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, which sounds like a hammer striking the 
cylinder walls. It makes poor driveability.

At stopped

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-41

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC P0069: Abnormal Correlation Between Manifold Absolute Pressure Sensor And Barometric 
Pressure Sensor

.

TECHNICAL DESCRIPTION

• The PCM detects abnormality in the sensor by 

comparing the manifold absolute pressure sensor 
output with the barometric pressure sensor out-
put.

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DESCRIPTIONS OF MONITOR METHODS

The PCM compares the manifold absolute pressure 

sensor output with the barometric pressure sen-
sor output while the engine control relay is in 
"ON" position after the ignition switch is in 
"LOCK" (OFF) position. When the difference 
exceeds the specified value between them, the 
PCM determines whether the manifold absolute 
pressure sensor / the barometric pressure sensor 
has malfunction or not.

.

MONITOR EXECUTION

Continuous

.

MONITOR EXECUTION CONDITIONS 
(Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

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