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Mitsubishi Galant (2004+). Manual - part 1274

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-789

STEP 6. Check harness connector D-17 at fuel level sensor
(sub) for damage.

Q: Is the connector in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 10.

STEP 7. Check for open circuit between fuel level sensor
(sub) connector D-17 (terminal No. 1) and fuel level sensor
(main) connector D-18 (terminal No. 2).

Q: Is the harness wire in good condition?

YES : Go to Step 8.
NO : Repair it. Then go to Step 10.

STEP 8. Check the fuel pump module.

Check to see if the fuel pump module is normal. Refer to
GROUP 54A, Chasiss Electrical

− Combination Meters Assem-

bly and Vehicle Speed Sensor

− On-Vehicle Service − Fuel

Level Sensor Check

P.54A-108

Q: Is the fuel pump module normal?

YES : Go to Step 9.
NO : Replace the fuel pump module. Then go to Step 10.

AK303160

CONNECTOR: D-17

SERVICE
HOLE

FUEL LEVEL
SENSOR (SUB)

D-17

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303160

CONNECTOR: D-17

SERVICE
HOLE

FUEL LEVEL
SENSOR (SUB)

D-17

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303159

SERVICE
HOLE

FUEL PUMP MODULE
(INCORPORATING FUEL
LEVEL SENSOR (MAIN)
AND FUEL TANK
TEMPERATURE SENSOR)

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-790

STEP 9. 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-5

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0461 set?

YES : Replace the PCM. Then go to Step 10.
NO : It can be assumed that this malfunction is intermittent.

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

P.00-6

STEP 10. 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-5

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0461 set?

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

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-791

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• Under the closed loop idle speed control.

• The engine coolant temperature is more than

°C (171°F).

• Battery positive voltage is higher than 10 volts.

• Power steering pressure switch: OFF.

• Volumetric efficiency is lower than 40 percent.

• Barometric pressure is higher than 76 kPa (22.4

in.Hg).

• Intake air temperature is higher than −10°C

(14

°F).

• 60 seconds have elapsed from the start of the

previous monitoring.

• Target throttle actuator control motor position is

more than 255 steps.

Judgment Criteria

• The actual idle speed is more than 100 r/min

lower than the target idle speed for 12 seconds.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 6

− Other Monitor

P.13B-5

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

• Throttle valve area is dirty.

• PCM failed.

• Throttle body assembly failed.

END

YES

MALFUNCTION

GOOD

START

CALCULATE

MONITORING

CONDITIONS

Ne = (ACTUAL-Ne) - (TARGET-Ne)

Ne: ENGINE SPEED

Ne < -100 r/min OR

> 200 r/min

HAVE 12secs PASSED?

AK302408

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-792

DIAGNOSIS

Required Special Tools

• MB991958: Scan tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code other than P0506 set?

YES : Refer to Diagnostic Trouble Code Chart

P.13B-33

NO : Go to Step 2.

STEP 2. Check the throttle body. (throttle valve area)
Q: Is the throttle valve area dirty?

YES : Perform cleaning. Refer to Throttle body (throttle

valve area) cleaning

P.13B-1133

. Then go to Step 4.

NO : Go to Step 3.

STEP 3. Replace the throttle body assembly.
(1) Replace the throttle body assembly.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0506 set?

YES : Replace the PCM. Then go to Step 4.
NO : The procedure is complete.

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

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