Mitsubishi Galant 9G. Manual - part 836

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-786

STEP 4. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II − Procedure 6 − Other 

Monitor 

P.13A-6

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0506 set?

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

DTC P0507: Idle Control Sytem RPM Higher Than Expected

CAUTION

If DTC P0507 has been set, TCL related DTC 
U1120 is also set. After P0507 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) <2.4L ENGINE>

13A-787

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• Vehicle speed has reached 1.5 km/h (1.0 mph) or 

more at least once.

• Under the closed loop idle speed control.

• Engine coolant temperature is higher than 77°C 

(171

°F).

• Battery positive voltage is higher than 10 volts.

• Barometric pressure is higher than 76 kPa (22.4 

in.Hg).

• Intake air temperature is higher than −10°C 

(14

°F).

• 25 seconds have elapsed from the start of the 

previous monitoring.

• Target throttle actuator control motor position is 0 

steps.

Judgment Criteria

• Actual idle speed has continued to be higher than 

the target idle speed by 200 r/min (300 r/min*) or 
more for 12 seconds.
*: Specs in parentheses are applicable if the max-

imum air temperature during the previous 
operation was more than 45

°C (113°F).

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13A-6

.

.

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

• Intake system vacuum leak.

• PCM failed.

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

START

CALCULATE      Ne

MONITORING

CONDITIONS

   Ne = (ACTUAL-Ne) – (TARGET-Ne)
Ne: ENGINE SPEED

    Ne < –100 r/min OR

> 200 r/min

HAVE 12secs PASSED?

AK302165

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-788

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) Set scan tool MB991958, read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code other than P0507 set?

YES : Refer to Diagnostic Trouble Code Chart 

P.13A-33

.

NO :  Go to Step 2.

STEP 2. Check the intake system vacuum leak.
Q: Are there any abnormalities?

YES : Repair or replace it. 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 P0507 set?

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

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-789

STEP 4. 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-6

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0507 set?

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

DTC P0513: Immobilizer Malfunction

.

TECHNICAL DESCRIPTION

• PCM monitors the communication condition with 

the immobilizer-ECU. When an abnormality in 
communication is found, PCM prevents engine 
start.

.

DTC SET CONDITIONS

Check Conditions

• Ignition switch: ON

Judgment Criteria

• When the communication error between PCM 

and the immobilizer-ECU continues for 2 seconds 
or more.

.

TROUBLESHOOTING HINTS (The most likely 

causes for this code to be set are:)

• Malfunction of harness or connector.

• Malfunction of immobilizer-ECU.

• Malfunction of PCM.