Mitsubishi Galant 9G. Manual — part 1085

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-640

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.

1

2

3

4

AK303017

CONNECTOR: B-17X

FRONT OF VEHICLE

B-17X

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

RELAY BOX

1

2

3

AK303130

HARNESS
CONNECTOR:
COMPONENT SIDE

AB

CAMSHAFT POSITION
SENSOR

B-106 (B)

CONNECTOR: B-106

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-641

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.13B-6

.

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

YES : Retry the troubleshooting.

NO : The inspection is complete.

1

2

3

AK303130

HARNESS
CONNECTOR:
COMPONENT SIDE

AB

CAMSHAFT POSITION
SENSOR

B-106 (B)

CONNECTOR: B-106

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-642

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

• Manifold absolute pressure sensor

• Accelerator pedal position sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-643

DTC SET CONDITIONS
Logic Flow Chart

.

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

AK204016

P0 : THRESHOLD VALUE