Mitsubishi Galant (2004+). Manual - part 803

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-29

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Test 
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 56 

− 64 km/h (35 − 40 mph).

3. Travel for 20 seconds or more while keeping the vehicle speed at 56 

− 64 km/h (35 − 40 

mph).

4. Fully close the throttle from an engine speed of 2,000 

− 3,000 r/min, and while keeping 

the clutch engaged, decelerate to approximately 900 r/min without applying the brakes. 
Do not steer the handle or turn the light ON/OFF during this time. (During monitor)

5. Accelerate until the vehicle speed reaches 56 

− 64 km/h (35 − 40 mph), and travel for 20 

seconds or more. Then, repeat steps 4 and 5 and complete 8 monitor sessions.

6. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
7. Confirm that the diagnostic trouble code (DTC) is not output.
8. If DTC P0401 is output, refer to DTC P0401 

− Exhaust Gas Recirculation Flow Insufficient 

detected 

P.13A-575

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EXHAUST GAS RECIRCULATION (EGR) SYSTEM MONITOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-30

PROCEDURE 6

OTHER MONITOR (Main components, sensors and switches, wire breakage and short circuit)
DTC

• Main components: P0106, P0107, P0108, P0134, P0154, P0300, P0301, P0302, P0303, 

P0304, P0506, P0507

• Sensors and switches: P0101, P0102, P0103, P0111, P0112, P0113, P0116, P0117, 

P0118, P0125, P0181, P0182, P0183, P0335, P0340, P0461, P2066, P2227, P2228, 
P2229

• Wire breakage and short circuit: P0130, P0131, P0132, P0135, P0136, P0137, P0138, 

P0141, P0150, P0151, P0152, P0155, P0156, P0157, P0158, P0161, P0201, P0202, 
P0203, P0204, P0403, P0443, P0446

Drive cycle 
pattern

This monitor [from start to ignition switch "LOCK" (OFF) position] will be completed while 
driving the vehicle with the following drive cycle pattern. It will take 10 minutes. You must 
complete this drive twice.
NOTE: Drive according to the graph below.

Inspection 
conditions

• Engine coolant temperature: 80°C (176°F) or more

• Atmospheric temperature: 5°C (41°F) or more

• Condition of A/T: Selector lever D range

AKX01350

AKX01350

(3)

(2)

(1)

(4)

300 SECONDS OR MORE
56 - 64 km/h (35 - 40 mph)

ENGINE: IDLING
TRANSMISSION: NEUTRAL
300 SECONDS

ENGINE START

IGNITION 
SWITCH:"LOCK" 
(OFF)

64
(40)

32
(20)

0

100

50

0

VEHICLE 
SPEED
km/h (mph)

AKX01350 AB

CALCULATED
LOAD (%)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-31

SYSTEM READINESS TEST STATUS

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PURPOSE
The Readiness function (also referred to as I/M 
Readiness or I/M Flags) indicates if a full diagnostic 
check has been "Completed" (is "Ready") for each 
non-continuous monitor. Enhanced I/M State Emis-
sion Programs will use the Readiness status (Codes) 
to see if the vehicle is ready for OBD-II testing. 
"Incomplete" (Not Ready) codes will be one of the 
triggers for I/M failure.

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OVERVIEW
The PCM monitors the following main diagnosis 
items and records whether the evaluation was com-
pleted or is incomplete. The Readiness codes were 
established for the I/M programs, thereby confirming 
that the vehicle was not tampered with by erasing the 
diagnostic trouble code(s) (DTCs) before I/M testing. 
The Readiness and DTC codes can be reset by dis-
connecting the battery or by erasing the codes with a 
scan tool. For this reason all Readiness codes must 
read "Complete" before I/M testing.
When the monitors run and complete, the scan tool 
MB991958 (MUT-III sub assembly) will record the 
Readiness Code as " Complete " (General Scan 
Tools record as " Ready "). When the vehicle is oper-
ating normally and the OBD-II Drive Cycle is carried 

out, Readiness Code will set as " Complete " on the 
first drive cycle. If during the first drive cycle a fault is 
detected then, a second drive is required before the 
Readiness Code will " Complete. " If the fault is still 
there, then a DTC will set.

• Catalyst: P0421, P0431

• Evaporative system: P0442, P0455, P0456

• Heated oxygen sensor: P0130, P0131, P0132, 

P0133, P0134, P0136, P0137, P0138, P0139, 
P0150, P0151, P0152, P0153, P0154, P0156, 
P0157, P0158, P0159

• Heated oxygen sensor heater: P0135, P0141, 

P0155, P0161

• EGR system: P0401

After the Readiness is "Complete," the technician is 
assured that any DTCs associated with that monitor 
will be displayed if the system has a problem. That is 
why some State's I/M programs require the Readi-
ness Code as "Complete" before they check for 
DTCs. 
NOTE: After a repair is for a DTC the technician 
should drive the OBD-II drive cycle checking that the 
scan tool MB991958 (MUT-III sub assembly) records 
all Readiness as "Complete".

Test 
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 56 

− 64 km/h (35 − 40 mph), and travel for 300 

seconds or more. 

3. Return the vehicle to the shop. 
4. After stopping the vehicle, continue idling for 300 seconds, and then turn the ignition 

switch to the "LOCK" (OFF) position. Moreover, the vehicle should be set to the following 
conditions for idling.
NOTE: Vehicles for Canada, the headlight, taillight, etc. remain lit even when the lighting 
switch is in "OFF" positions but this is no problem for checks.

• A/C switch: OFF

• Lights and all accessories: OFF

• Transaxle: P range

• Steering wheel: Straightforward position

5. Confirm that the diagnostic trouble code (DTC) is not output.
6. If a DTC is displayed, refer to Diagnostic Trouble Code Chart 

P.13A-34

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OTHER MONITOR (Main components, sensors and switches, wire breakage and short circuit)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-32

FAIL-SAFE FUNCTION REFERENCE TABLE

M1131153000374

When the main sensor malfunctions are detected by 
the diagnostic test mode, the vehicle is controlled by 
means of the following defaults.

MALFUNCTION ITEM

CONTROL CONTENTS DURING MALFUNCTION

Mass airflow sensor

• Uses the throttle position sensor signal and engine speed signal (crankshaft 

position sensor signal) for basic injector drive time and basic ignition timing 
from the pre-set mapping.

Intake air temperature 
sensor

Controls as if the intake air temperature is 25

°C (77°F).

Engine coolant 
temperature sensor

Controls as if the engine coolant temperature is 80

°C (176°F). (This control will 

be continued until the ignition switch is turned to " LOCK " (OFF) position even 
though the sensor signal returns to normal.)

Camshaft position sensor Injects fuel into the cylinders in the order 1-3-4-2 with irregular timing. (After the 

ignition switch is turned to the "ON" position, the No. 1 cylinder top dead center 
is not detected at all.)

Barometric pressure 
sensor

Controls as if the barometric pressure is 101 kPa (30 in.Hg).

Knock sensor

Switches the ignition timing from ignition timing for high octane to ignition timing 
for standard octane fuel.

Heated oxygen sensor 
<front>

Air/fuel ratio closed loop control is not performed.

Heated oxygen sensor 
<rear>

Performs the closed loop control of the air/fuel ratio by using only the signal of 
the heated oxygen sensor (front) installed on the front side of the catalytic 
converter.

Generator FR terminal

No generator output suppression control is performed for the electrical load (to 
be operated as an ordinary generator).

Misfire detection

The PCM stops supplying fuel to the cylinder with the highest misfiring rate if a 
misfiring that could damage the catalytic converter is detected.

Accelerator pedal position 
sensor (main)

• Detects the amount of the accelerator pedal travel through the use of the 

accelerator pedal position sensor (sub) signal, but rendering it only as being 
approximately one-half the normal opening angle.

• Prohibits the operation of the auto-cruise control. 

• Cuts off fuel when the engine speed exceeds 3,000 r/min.

• Suppresses the engine output by stopping the electronically controlled 

throttle valve system if the accelerator pedal position sensor (sub) is also 
malfunctioning.

Accelerator pedal position 
sensor (sub)

• Detects the amount of the accelerator pedal travel through the use of the 

accelerator pedal position sensor (main) signal, but rendering it only as being 
approximately one-half the normal opening angle.

• Prohibits the operation of the auto-cruise control.

• Cuts off fuel when the engine speed exceeds 3,000 r/min.

• Suppresses the engine output by stopping the electronically controlled 

throttle valve system if the accelerator pedal position sensor (main) is also 
malfunctioning.