Mitsubishi Outlander GS45X. Manual - part 631

 

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Mitsubishi Outlander GS45X. Manual - part 631

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-347

DTC SET CONDITIONS

Logic Flow Chart

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) <2.4L ENGINE>

13A-348

Check Conditions

• Engine speed is between 438 and 6,594 r/min.

• Engine coolant temperature is higher than −10°C 

(14

°F).

• 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

• Misfire has occurred in 2.0 percent or more of the 

last 1,000 revolutions (corresponding to 1.5 times 
the limit of emission standard).

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Pattern 15 

P.13A-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.

• Crankshaft position sensor failed.

• Incorrect air/fuel ratio.

• Low compression pressure.

• Skipping of timing belt teeth.

• EGR system and EGR valve 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

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.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-349

STEP 2. 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.

• The tachometer and engine speed indicated on the scan 

tool should match.

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

YES : Go to Step 3.
NO :  Refer to, DTC P0335 

− Crankshaft Position Sensor 

Circuit 

P.13A-372

.

STEP 3. Using scan tool MB991958, check data list item 26: 
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, 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.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the specification normal?

YES : Go to Step 4.
NO :  Refer to DTC P0171 

− System too Lean 

P.13A-262

DTC P0172 

− System too Rich 

P.13A-268

.

STEP 4. Using scan tool MB991958, check data list item 28: 
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, 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.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the specification normal?

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

− System too Lean 

P.13A-262

DTC P0172 

− System too Rich 

P.13A-268

.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-350

STEP 5. Visual check of ignition spark.
(1) Remove the spark plug and install it to the ignition coil.
(2) Connect the ignition coil connector.
(3) Remove all injector connector.
(4) At the engine start, check each spark plug produces a 

spark.

Q: Did it spark?

YES : Go to Step 7.
NO :  Go to Step 6.

STEP 6. 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 Symptom Procedures 24 

− Ignition Circuit 

System 

P.13A-807

.

NO :  Replace the faulty spark plug. Then go to Step 9.

STEP 7. 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 or replace it. Then go to Step 9.
NO :  Go to Step 8.

STEP 8. 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.13A-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 Code 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 9.

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

.

AKX00432

Spark plug

AC

 

 

 

 

 

 

 

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