Mitsubishi Galant (2004+). Manual — part 939

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-573

STEP 16. Check harness connector B-22 at PCM for
damage.

Q: Is the harness connector in good condition?

YES : Go to Step 17.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 20.

STEP 17. Check for harness damage between MFI relay
connector B-17X (terminal No. 4) and camshaft position
sensor connector B-106 (terminal No. 3).

Q: Is the harness wire in good condition?

YES : Go to Step 18.
NO : Repair it. Then go to Step 20.

AK303016

104

96

94

95

93 92 91

99 98 97

103 102 101 100

108 107 106 105

113 112 111 110 109

CONNECTOR: B-22

B-22 (B)

PCM

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

AK303806

2

1

3

4

AB

CONNECTOR: B-17X

B-17X

RELAY BOX
TRIANGLE
MARK

HARNESS CONNECTOR:
COMPONENT SIDE

AK303863

1

2

3

AB

CONNECTOR: B-106

B-106 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-574

STEP 18. Check for harness damage between camshaft
position sensor connector B-106 (terminal No. 2) and PCM
connector B-22 (terminal No. 104).

Q: Is the harness wire in good condition?

YES : Go to Step 19.
NO : Repair it. Then go to Step 20.

STEP 19. Check the camshaft position sensing cylinder.
Q: Is the camshaft position sensing cylinder in good

condition?
YES : Replace the camshaft position sensor. Then go to

Step 20.

NO : Repair it. Then go to Step 20.

STEP 20. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Procedure 6 −

Other Monitor

P.13A-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0340 set?

YES : Retry the troubleshooting.
NO : The inspection is complete.

AK303863

1

2

3

AB

CONNECTOR: B-106

B-106 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK303016

104

96

94

95

93 92 91

99 98 97

103 102 101 100

108 107 106 105

113 112 111 110 109

CONNECTOR: B-22

B-22 (B)

PCM

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

CONTINUE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-575

13A

DTC P0401: Exhaust Gas Recirculation Flow Insufficient Detected

.

TECHNICAL DESCRIPTION

• When the EGR valve (stepper motor) is actuated

from the fully closed position toward the open
position while the engine is running, EGR gas
flows.

• The PCM checks how the EGR gas flow signal

changes.

.

DESCRIPTIONS OF MONITOR METHODS
Small manifold pressure change during exhaust gas

recirculation (EGR) operation from closed to
open.

.

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)

• EGR stepper motor monitor

Sensor (The sensor below is determined to be

normal)

• Mass airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Throttle position sensor

• Accelerator pedal position sensor

• Manifold absolute pressure sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-576

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• At least 20 seconds have passed since the last

monitor was complete.

• Engine coolant temperature is higher than 76°C

(169

°F).

• Engine speed is at between 1,100 and 1,750

r/min.

• Intake air temperature is higher than −10°C

(14

°F).

• Barometric pressure is higher than 76 kPa (22.4

in.Hg).

• Vehicle speed is 20 km/h (32 mph) or more.

• At least 90 seconds have passed since manifold

absolute pressure sensor output voltage fluctu-
ated 1.5 volts or more.

• Battery positive voltage is higher than 10.3 volts.

• Accelerator pedal is closed.

• Volumetric efficiency is lower than 23.8 percent.

• The PCM monitors for this condition for 3 cycles

of 2.0 seconds each during the drive cycle.

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

MONITORING

CONDITIONS

MEASURE MANIFOLD

PRESSURE (P1)

MEASURE MANIFOLD

PRESSURE (P2)

EGR VALVE OPEN

P2 - P1 < P0 *

SPECIFIED

TIMES

AK302036

P0 : THRESHOLD VALUE