Mitsubishi Outlander GS45X. Manual — part 869

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-409

STEP 3. Using scan tool MB991958, check data list item 2:
Crankshaft Position Sensor.

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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item

2, Crankshaft Position Sensor.

(4) Check the waveform of the crankshaft position sensor while

keeping the engine speed constant.

• The pulse width should be constant.

Q: Is the sensor operating properly?

YES : Go to Step 4.
NO : Refer to DTC P0335

− Crankshaft Position Sensor

Circuit

P.13B-445

.

STEP 4. Using scan tool MB991958, check data list item 26
<bank 1> and 27 <bank2>: Long-Term Fuel Trim.
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item

26<bank 1> and 27 <bank2>, Long-Term Fuel Trim.

• The fuel trim should be between −12.5 and +12.5 per-

cent when the engine is 2,500 r/min (during closed loop)
after the engine is warmed.

Q: Is the specification normal?

YES : Go to Step 5.
NO : Refer to DTC P0171

− System too Lean (bank 1)

P.13B-303

, DTC P0172

− System too Rich (bank 1)

P.13B-310

, DTC P0174

− System too Lean (bank 2)

P.13B-316

, DTC P0175

− System too Rich (bank 2)

P.13B-323

.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-410

STEP 5. Using scan tool MB991958, check data list item 28
<bank 1> and 29 <bank2>: Short-Term Fuel Trim.
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item

28<bank 1> and 29 <bank2>, Short-Term Fuel Trim.

• The fuel trim should be between −7.4 and 7.4 percent

when the engine is 2,500 r/min (during closed loop) after
the engine is warmed.

Q: Is the specification normal?

YES : Go to Step 6.
NO : Refer to DTC P0171

− System too Lean (bank 1)

P.13B-303

, DTC P0172

− System too Rich (bank 1)

P.13B-310

, DTC P0174

− System too Lean (bank 2)

P.13B-316

, DTC P0175

− System too Rich (bank 2)

P.13B-323

.

STEP 6. Check the each ignition coil spark.
(1) Remove the intake manifold.
(2) Remove the ignition coil.
(3) Remove the 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 8.
NO : Go to Step 7.

STEP 7. Check the 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 faulty spark plug. Then go to Step 10.

STEP 8. Check the following items.
(1) Check the following items, and repair or replace the

defective component.

a. Check for skipped timing belt teeth.
b. Check compression.

c. EGR valve failed.

Q: Are there any abnormalities?

YES : Repair it. Then go to Step 10.
NO : Go to Step 9.

AK700310AB

Spark plug

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-411

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 − Pattern 15

P.13B-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0300 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 10.

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 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 − Pattern 15

P.13B-11

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0300 set?

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

DTC P0301: Cylinder 1 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-412

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