Mitsubishi Galant (2004+). Manual - part 805

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-37

P0742

Torque converter clutch 
circuit stuck on

• A/T DTC No. 53 (Torque converter clutch 

solenoid system: Lock-up stuck on)

P.23A-43

P0743*

Torque converter clutch 
circuit electrical

• A/T DTC No. 36 (Torque converter clutch 

solenoid system: Short circuit/Open circuit)

P.23A-43

P0753*

Shift solenoid "A" 
electrical

• A/T DTC No. 31 (Low and reverse solenoid 

valve system: Short circuit/Open circuit)

P.23A-43

P0758*

Shift solenoid "B" 
electrical

• A/T DTC No. 32 (Underdrive solenoid valve 

system: Short circuit/Open circuit)

P.23A-43

P0763*

Shift solenoid "C" 
electrical

• A/T DTC No. 33 (Second solenoid valve 

system: Short circuit/Open circuit)

P.23A-43

P0768*

Shift solenoid "D" 
electrical

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

system: Short circuit/Open circuit)

P.23A-43

P1020

Mitsubishi innovative valve timing and lift electronic control system 
(MIVEC) performance problem

P.13A-803

P1021

Engine oil control valve circuit

P.13A-813

P1601*

Communication malfunction (between PCM and throttle actuator control 
unit)

P.13A-823

P1603*

Battery backup line malfunction

P.13A-825

P1751*

A/T control relay 
malfunction

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

Short circuit to ground /open circuit)

P.23A-43

P2066

Fuel level sensor (sub) circuit range/performance

P.13A-832

P2100*

Throttle actuator control motor circuit (open)

P.13A-837

P2101*

Throttle actuator control motor magneto malfunction

P.13A-845

P2102*

Throttle actuator control motor circuit (shorted low)

P.13A-851

P2103*

Throttle actuator control motor circuit (shorted high)

P.13A-857

P2108*

Throttle actuator control processor malfunction

P.13A-863

P2122*

Accelerator pedal position sensor (main) circuit low input

P.13A-865

P2123*

Accelerator pedal position sensor (main) circuit high input

P.13A-875

P2127*

Accelerator pedal position sensor (sub) circuit low input

P.13A-882

P2128*

Accelerator pedal position sensor (sub) circuit high input

P.13A-892

P2135*

Throttle position sensor (main and sub) range/performance problem

P.13A-899

P2138*

Accelerator pedal position sensor (main and sub) range/performance 
problem

P.13A-905

P2227*

Barometric pressure circuit range/performance problem

P.13A-918

P2228*

Barometric pressure circuit low input

P.13A-920

P2229*

Barometric pressure circuit high input

P.13A-923

U1073

Bus off

P.13A-926

U1102

ABS

−ECU time−out

P.13A-928

U1108*

Combination meter time

−out

P.13A-932

U1110

A/C

−ECU time−out

P.13A-936

DTC

DIAGNOSTIC ITEM

REFERENCE 
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-38

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.

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.

.

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-941

Communication with PCM only is not possible

2

P.13A-944

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-947

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

4

P.13A-948

Starting

Cranks, won't start

5

P.13A-950

Starts up and dies

6

P.13A-956

Hard starting

7

P.13A-962

Idling stability 
(improper 
idling)

Unstable idle (rough idle, hunting)

8

P.13A-967

Idle speed is high (improper idle speed)

9

P.13A-971

Idle speed is low (improper idle speed)

10

P.13A-973

Idling stability 
(engine stalls)

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

11

P.13A-974

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

12

P.13A-978

The engine stalls when accelerating (pass out)

13

P.13A-982

The engine stalls when decelerating

14

P.13A-983

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-39

.

PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)

Driving

Hesitation, sag or stumble

15

P.13A-985

Acceleration shock

16

P.13A-989

Deceleration shock

17

P.13A-990

Poor acceleration

18

P.13A-991

Surge

19

P.13A-996

Knocking

20

P.13A-1000

Dieseling (Run-on)

21

P.13A-1001

Too high CO and HC concentration when idling

22

P.13A-1002

IM240 test 
failure

Transient, mass emission tailpipe test failure

23

P.13A-1005

Purge flow test of the evaporative emission canister 
failure

24

P.13A-1012

Pressure test of the evaporative system failure

25

P.13A-1013

Generator output voltage is low (approximately 12.3 volts)

26

P.13A-1014

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

27

P.13A-1018

Power supply system and ignition switch-IG system

28

P.13A-1022

Fuel pump system

29

P.13A-1033

Ignition switch-ST system and transmission range switch system

30

P.13A-1047

Ignition circuit system

31

P.13A-1052

A/C system

32

P.13A-1060

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