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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)].

• 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,

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

)

End

Yes

Good

Within 1000rev

Malfunction

(exceed std × 1.5)

Good

Malfunction (catalytic

converter is damaged.)

Good

Calculate percent misfire (R

)

Within 200rev

Ne
Ec : Charge efficiency
TH

: Threshold value for misfire

: Threshold value for catalyst damage

AK800585

Start

Yes

Monitoring
conditions

An < TH

(Ne, Ec)

>= specified value

>= TH

(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)].

• 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