Mitsubishi Outlander GS45X. Manual - part 868

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-405

STEP 4. Using scan tool MB991958, check data list item 15: 
Throttle Position Sensor (sub).

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) Detach the intake air hose at the throttle body.
(4) Disconnect the connector of the throttle position sensor.
(5) Use test harness special tool (MB991658) to connect only 

terminals No. 3, No. 4, No. 5, and No. 6.

(6) Set scan tool MB991958 to the data reading mode for item 

15, Throttle Position Sensor (sub).

• Output voltage should be 4.0 volts or more when the 

throttle valve is fully closed with your finger.

• Output voltage should be 1.0 volt or less when the throt-

tle valve is fully open with your finger.

(7) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : 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.00-15

.

NO :  Go to Step 5.

STEP 5. 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 P0223 set?

YES :  Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Codes Registration Judgment Table <Vehicles 

with KOS> 

P.42B-15

 or GROUP 42C, Diagnosis 

− ID 

Codes Registration Judgment Table <Vehicles with 
WCM> 

P.42C-10

. Then go to Step 6.

NO :  The inspection is complete.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-406

STEP 6. 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 DTC P0223 set?

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

DTC P0300: Random/Multiple Cylinder Misfire Detected

.

TECHNICAL DESCRIPTION

• If a misfire occurs while the engine is running, the 

engine speed changes for an instant.

• The ECM checks for such changes in engine 

speed.

.

DESCRIPTIONS OF MONITOR METHODS

Monitor angular acceleration of crankshaft and 
detect malfunction when negative variation of the 
angular acceleration is large.

.

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)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Camshaft position sensor

• 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) <3.0L ENGINE>

13B-407

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine speed is between 438 and 6,500 r/min.

• Engine coolant temperature is higher than −10°C 

(14

°F).

Calculate crankshaft

angular acceleration (An)

Misfire

Calculate percent misfire (R

MF

)

End

No

No

No

No

No

No

Yes

Good

Within 1000rev

Malfunction

(exceed std × 1.5)

Good

Malfunction (catalytic

converter is damaged.)

Good

Calculate percent misfire (R

MF

)

Within 200rev

Ne
Ec     : Charge efficiency
TH

MF

 : Threshold value for misfire

TH

CD

 : Threshold value for catalyst damage

AK800585

Start

Yes

Yes

Yes

Yes

Yes

Monitoring
conditions

An < TH

MF

 (Ne, Ec)

R

MF

 

>= specified value

R

MF

 >= TH

CD

 (Ne, Ec)

: Engine speed

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-408

• Barometric pressure is higher than 76 kPa (22.4 

in.Hg).

• The engine load is with in the positive torque 

load.

• Adaptive learning is complete for the vane which 

generates a crankshaft position signal.

• While the engine is running, excluding sudden 

acceleration/deceleration and fuel shut-off opera-
tion.

Judgement Criterion (change in the angular 

acceleration of the crankshaft is used for mis-
fire detection).

• Misfire has occurred more frequently than 

allowed during the last 200 revolutions [when the 
catalyst temperature is higher than 1,000

°C 

(1,832

°F)].

or

• The occurrence rate of engine misfiring within the 

1,000 engine revolutions is more than 1.7 % 
<Except for California> or 1.8 % <California>.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Pattern 15 

P.13B-11

.

.

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

• Included air due to lack of fuel

• Ignition system related part(s) failed.

• Poor crankshaft position sensor.

• Incorrect air/fuel ratio.

• Spark plug failed.

• Low compression pressure.

• Skipping of timing belt teeth.

• EGR valve (stopper motor) failed.

• ECM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB992110: Power Plant ECU Check Harness

STEP 1. Check whether air is included due to the lack of 
fuel or not

• Check whether users have experienced the lack of fuel or 

not.

Q: Has the user ever experienced the lack of fuel?

YES : Erase the diagnosis codes to finish the check.
NO :  Go to Step 2.

STEP 2. Check the EGR system
Refer to GROUP 17, Emission Control 

− Exhaust Gas Recircu-

lation (EGR) System 

− General Information (Exhaust Gas 

Recirculation System) 

P.17-80

.

Q: Are there any abnormalities?

YES : Replace the EGR valve (stopper motor). Then go to 

Step 10.

NO :  Go to Step 3.