Index Mitsubishi Mitsubishi Galant 9G - service repair manual

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Mitsubishi Galant 9G. Manual - part 934

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-36

P0403

Exhaust gas recirculation control circuit

P0421

Warm up catalyst efficiency below threshold (bank 1)

P0431

Warm up catalyst efficiency below threshold (bank 2)

P0441

Evaporative emission control system incorrect purge flow

P0442

Evaporative emission control system leak detected (Small leak)

P0443

Evaporative emission control system purge control valve circuit

P0446

Evaporative emission control system vent control circuit

P0450

Evaporative emission control system pressure sensor malfunction

P0451

Evaporative emission control system pressure sensor range/performance

P0452

Evaporative emission control system pressure sensor low input

P0453

Evaporative emission control system pressure sensor high input

P0455

Evaporative emission control system leak detected (Gross leak)

P0456

Evaporative emission control system leak detected (Very small leak)

P0461

Fuel level sensor (main) circuit range/performance

P0462

Fuel level sensor circuit low input

P0463

Fuel level sensor circuit high input

P0506

Idle control system RPM lower than expected

P0507

Idle control system RPM higher than expected

P0513

Immobilizer malfunction

P0551

Power steering pressure switch circuit range/performance

P0554

Power steering pressure switch circuit intermittent

P0603

EEPROM malfunction

P0606*

Powertrain control module main processor malfunction

P0622

Generator FR terminal circuit malfunction

P0630

VIN malfunction

P0638*

Throttle actuator control motor circuit range/ performance problem

P0642*

Throttle position sensor power supply

P0657

Throttle actuator control motor relay circuit malfunction

P0705

Transmission range
switch circuit malfunction
(PRNDL input)

• A/T DTC No. 27 (Transmission range switch

system: Open circuit)

• A/T DTC No. 28 (Transmission range switch

system: Short circuit)

P0712*

Transmission fluid
temperature sensor low
input

• A/T DTC No. 16 (Transmission fluid

temperature sensor system: Short circuit)

P0713*

Transmission fluid
temperature sensor high
input

• A/T DTC No. 15 (Transmission fluid

temperature sensor system: Open circuit)

DTC

DIAGNOSTIC ITEM

REFERENCE
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-37

P0715*

Input/turbine speed
sensor circuit

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

system: Short circuit/Open circuit)

P0720*

Output speed sensor
circuit

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

system: Short circuit/Open circuit)

P0731*

Gear 1 incorrect

• A/T DTC No. 41 (1st gear incorrect ratio)

P0732*

Gear 2 incorrect

• A/T DTC No. 42 (2nd gear incorrect ratio)

P0733*

Gear 3 incorrect

• A/T DTC No. 43 (3rd gear incorrect ratio)

P0734*

Gear 4 incorrect

• A/T DTC No. 44 (4th gear incorrect ratio)

P0736*

Gear R incorrect

• A/T DTC No. 46 (Reverse gear incorrect

ratio)

P0741

Torque converter clutch
circuit performance or
stuck off

• A/T DTC No. 52 (Torque converter clutch

solenoid system: Defective system)

P0742

Torque converter clutch
circuit stuck on

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

solenoid system: Lock-up stuck on)

P0743*

Torque converter clutch
circuit electrical

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

solenoid system: Short circuit/Open circuit)

P0753*

Shift solenoid "A"
electrical

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

valve system: Short circuit/Open circuit)

P0758*

Shift solenoid "B"
electrical

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

system: Short circuit/Open circuit)

P0763*

Shift solenoid "C"
electrical

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

system: Short circuit/Open circuit)

P0768*

Shift solenoid "D"
electrical

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

system: Short circuit/Open circuit)

P1530

A/C1 switch circuit intermittent

P1602*

Communication malfunction (between PCM main processor and system
LSI)

P1603*

Battery backup line malfunction

P1751*

A/T control relay
malfunction

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

Short circuit to ground /open circuit)

P2066

Fuel level sensor (sub) circuit range/performance

P2100*

Throttle actuator control motor circuit (open)

P2101*

Throttle actuator control motor magneto malfunction

P2122*

Accelerator pedal position sensor (main) circuit low input

P2123*

Accelerator pedal position sensor (main) circuit high input

P2127*

Accelerator pedal position sensor (sub) circuit low input

P2128*

Accelerator pedal position sensor (sub) circuit high input

P2135*

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

P2138*

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

DTC

DIAGNOSTIC ITEM

REFERENCE
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-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.
NOTE: Bank 1 indicates the right bank side cylinder, and Bank 2 indicates the left bank side cylinder.

SYMPTOM CHART

M1131151500726

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 DTC(s). If
DTC(s) 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.

P2228*

Barometric pressure circuit low input

P2229*

Barometric pressure circuit high input

U1073

Bus off

U1102

ABS

−ECU time−out

U1108*

Combination meter time

−out

U1110

A/C

−ECU time−out

DTC

DIAGNOSTIC ITEM

REFERENCE
PAGE

TROUBLE SYMPTOMS

INSPECTION
PROCEDURE

REFERENCE
PAGE

Communication
with scan tool is
impossible

Communication with all systems is not possible

1

Communication with PCM only is not possible

2

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

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

4

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-39

.

PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)

Starting

Cranks, won't start

5

Starts up and dies

6

Hard starting

7

Idling stability
(improper
idling)

Unstable idle (rough idle, hunting)

8

Idle speed is high (improper idle speed)

9

Idle speed is low (improper idle speed)

10

Idling stability
(engine stalls)

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

11

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

12

The engine stalls when accelerating (pass out)

13

The engine stalls when decelerating

14

Driving

Hesitation, sag or stumble

15

Acceleration shock

16

Deceleration shock

17

Poor acceleration

18

Surge

19

Knocking

20

Dieseling (Run-on)

21

Too high CO and HC concentration when idling

22

IM240 test
failure

Transient, mass emission tailpipe test failure

23

Purge flow test of the evaporative emission canister
failure

24

Pressure test of the evaporative system failure

25

Generator output voltage is low (approximately 12.3 volts)

26

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

27

Power supply system and ignition switch-IG system

28

Fuel pump system

29

Ignition switch-ST system and transmission range switch system

30

Ignition circuit system

31

A/C system

32

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.

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