Mitsubishi Outlander GS45X. Manual — part 873

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-425

• 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:)

• Spark plug failed.

• Ignition system related part(s) failed.

• Low compression pressure.

• ECM failed.

DIAGNOSIS

STEP 1. Check the No. 5 cylinder ignition coil spark.
(1) Remove the intake manifold.
(2) Remove the No. 5 cylinder ignition coil.
(3) Remove the No. 5 cylinder spark plug and connect to the

ignition coil.

(4) Ground the spark plug side electrode securely.

• When the engine is cranked, the spark plug should

spark.

Q: Did it spark?

YES : Go to Step 3.
NO : Go to Step 2.

STEP 2. Check the No. 5 cylinder spark plugs.
Refer to GROUP 16, Ignition System

− On-vehicle Service −

Spark Plug Check And Cleaning

P.16-45

.

Q: Is the spark plug normal?

YES : Refer to INSPECTION PROCEDURE 24

− Ignition

Circuit System

P.13B-823

.

NO : Replace the No. 5 cylinder spark plug. Then go to

Step 5.

STEP 3. Check the compression.
Refer to GROUP 11C, On-vehicle Service

− Compression

Pressure Check

P.11C-18

.

Q: Are there any abnormalities?

YES : Replace it. Then go to Step 5.
NO : Go to Step 4.

AK700310AB

Spark plug

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-426

STEP 4. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 15

P.13B-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0305 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 5.

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.00-15

.

STEP 5. 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 − Pattern 15

P.13B-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0305 set?

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

DTC P0306: Cylinder 6 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-427

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-428

• 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:)

• Spark plug failed.

• Ignition system related part(s) failed.

• Low compression pressure.

• ECM failed.

DIAGNOSIS

STEP 1. Check the No. 6 cylinder ignition coil spark.
(1) Remove the No. 6 cylinder ignition coil.
(2) Remove the No. 6 cylinder spark plug and connect to the

No. 6 cylinder ignition coil.

(3) Ground the spark plug side electrode securely.

• When the engine is cranked, the spark plug should

spark.

Q: Did it spark?

YES : Go to Step 3.
NO : Go to Step 2.

STEP 2. Check the No. 6 cylinder spark plugs.
Refer to GROUP 16, Ignition System

− On-vehicle Service −

Spark Plug Check And Cleaning

P.16-45

.

Q: Is the spark plug normal?

YES : Refer to INSPECTION PROCEDURE 24

− Ignition

Circuit System

P.13B-823

.

NO : Replace the No. 6 cylinder spark plug. Then go to

Step 5.

STEP 3. Check the compression.
Refer to GROUP 11C, On-vehicle Service

− Compression

Pressure Check

P.11C-18

.

Q: Are there any abnormalities?

YES : Replace it. Then go to Step 5.
NO : Go to Step 4.

AK700310AB

Spark plug

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