Mitsubishi Galant 9G. Manual — part 1136

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-844

STEP 3. Check for short circuit to ground between PCM
connector B-20 (terminal No. 24) and fuel level sensor
(sub) connector D-17 (terminal No. 1).

NOTE: Check harness after checking intermediate connector
C-25. If intermediate connector is damaged, repair or replace it.
Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Then go to Step 7.
Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO : Repair it. Then go to Step 7.

AK303878

1

2

AB

CONNECTOR: D-17

D-17

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303092

25

21

24 23 22

29 28 27 26

34 33 32 31 30

38 37 36 35

43 42 41 40 39

CONNECTOR: B-20

B-20

PCM

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-845

STEP 4. Check harness connector D-18 at fuel level sensor
(main) for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 5.
NO : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

Then go to

Step 7.

STEP 5. Check for open circuit and short circuit to ground
between fuel level sensor (main) connector D-18 (terminal
No. 2) and fuel level sensor (sub) connector D-17 (terminal
No. 1).
Q: Is the harness wire in good condition?

YES : Go to Step 6.
NO : Repair it. Then go to Step 7.

AK303840

1

2

3

4

5

SERVICE
HOLE

AB

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303878

1

2

AB

CONNECTOR: D-17

D-17

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303840

1

2

3

4

5

SERVICE
HOLE

AB

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-846

STEP 6. Check the trouble symptoms.
(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 P0463 set?

YES : Replace the PCM. Then go to Step 7.
NO : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunctions

P.00-14

.

STEP 7. 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 P0463 set?

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

NEXT>>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-847

13B

DTC P0506: Idle Control Sytem RPM Lower Than Expected

CAUTION

If DTC P0506 has been set, TCL related DTC
U1120 is also set. After P0506 has been diag-
nosed, don't forget to erase DTC U1120.

.

TECHNICAL DESCRIPTION

• The amount of air taken in during idling is regu-

lated by the opening and closing of the throttle
valve.

• The PCM checks the difference between the

actual engine speed and the target engine speed.

.

DESCRIPTIONS OF MONITOR METHODS

Difference between actual and target idle speed is

over the specified value.

.

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)

• Misfire monitor

• Exhaust gas recirculation (EGR) system monitor

• Fuel system 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

.

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