Mitsubishi Outlander GS45X. Manual — part 736

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-767

STEP 9. Check the positive crankcase ventilation system.
Refer to GROUP 17, Emission Control

− Positive Crankcase

Ventilation System

− Positive Crankcase Ventilation System

Check

P.17-74

.

Q: Is the positive crankcase ventilation system?

YES : Go to Step 10.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 10. Check the evaporative emission control system.
Refer to GROUP 17, Emission Control

− Evaporative Emission

Control System

− Purge Control System Check (Purge Flow

Check)

P.17-77

.

Q: Is the purge control system normal?

YES : Check the following items, and repair or replace the

defective items.

a. Check if the injectors are clogged.

Then confirm that the malfunction symptom is

eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

Inspection procedure 18: Transient, mass emission tailpipe test failure

.

COMMENT

• The test is failed when the air/fuel ratio is not con-

trolled to the ideal air/fuel ratio. This occurs due
to the feedback control by heated oxygen sensor
signals, insufficient EGR flow rate, or deteriorated
catalyst.

NOTE: If the three-way catalyst temperature is low
when checking the exhaust gas, the three-way cata-
lyst cannot sufficiently clean the emissions. Warm up
the engine sufficiently before checking the exhaust,
and check immediately.

.

TROUBLESHOOTING HINTS (The most
likely causes for this case:)

• Malfunction of air/fuel ratio control system.

• Malfunction of the fuel pump system.

• Malfunction of the ignition system.

• Poor compression.

• Malfunction of the EGR system.

• Improper operation of the PCV valve

• Malfunction of the evaporative emission control

system

• Deteriorated catalyst.

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 the exhaust gas with the engine at normal
operating temperature.
Q: Was the exhaust gas checked with engine warmed

sufficiently?
YES : Go to Step 2.
NO : Check it again after enough warm up.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-768

STEP 2. Check the following items.
(1) Check the following items.

a. Check all vacuum hoses and connectors.
b. Check electrical wires and connectors for obvious prob-

lems.

Q: Are they normal?

YES : Go to Step 3.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

STEP 3. Check the driveability.
Q: Is the driveability normal?

YES : Go to Step 4.
NO : Refer to Trouble Symptom Chart

P.13A-54

.

STEP 4. 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) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is any DTC set?

YES : Refer to Diagnostic Trouble Code Chart

P.13A-49

.

NO : Go to Step 5.

STEP 5. Check the ignition timing.
Refer to GROUP 11A, On-vehicle Service

− Ignition Timing

Check

P.11A-13

.

Q: Is the ignition timing normal?

YES : Go to Step 6.
NO : Check that the crankshaft position sensor and timing

chain case are in the correct position. Then confirm
that the malfunction symptom is eliminated.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-769

STEP 6. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to Data List

Reference Table

P.13A-818

.

a. Item 5: Intake Air Temperature Sensor.
b. Item 6: Engine Coolant Temperature Sensor.

c. Item BB: Barometric Pressure Sensor

d. Item E1: Linear Air-fuel Ratio Sensor.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?

YES : Go to Step 7.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

STEP 7. Using scan tool MB991958, check data list item
AD: Heated oxygen sensor (rear).
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item

AD, Heated Oxygen Sensor (rear).

a. Transaxle: 2nd
b. Drive with wide open throttle

c. Engine: 3,500 r/min

• The output voltages should be between 0.6 and 1.0

volt.

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

YES : Go to Step 8
NO : Refer to, P0137

− Heated Oxygen Sensor (rear)

Circuit Low Voltage

P.13A-241

, DTC P0138

− Heated

Oxygen Sensor (rear) Circuit High Voltage

P.13A-249

, DTC P0139

− Heated Oxygen Sensor

(rear) Circuit Slow Response

P.13A-253

, DTC P0140

− Heated Oxygen Sensor (rear) Circuit No Activity

Detected

P.13A-258

.

STEP 8. Check the EGR system.
Refer to GROUP 17, Emission Control

− Exhaust Gas Recircu-

lation (EGR) System

− General Description (EGR System)

P.17-80

.

Q: Is the EGR system normal?

YES : Go to Step 9.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

STEP 9. Check the fuel pressure.
Refer to Fuel Pressure Test

P.13A-868

.

Q: Is the fuel pressure normal?

YES : Go to Step 10.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-770

STEP 10. Check the spark plugs.
Refer to GROUP 16, Ignition System

− On-vehicle Service −

Spark Plug Check And Cleaning

P.16-45

.

Q: Are there any abnormalities?

YES : Replace the spark plug. Then confirm that the

malfunction symptom is eliminated.

NO : Go to Step 11.

STEP 11. Check the ignition coil.
Refer to GROUP 16, Ignition System

− On-vehicle Service −

Ignition Coil Check

P.16-44

.

Q: Are there any abnormalities?

YES : Replace the ignition coil. Then confirm that the

malfunction symptom is eliminated.

NO : Go to Step 12.

STEP 12. Check the compression pressure.
Refer to GROUP 11A, On-vehicle Service

− Compression

Pressure Check

P.11A-18

.

Q: Is the compression pressure normal?

YES : Go to Step 13.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 13. Check the positive crankcase ventilation system.
Refer to GROUP 17, Emission Control

− Positive Crankcase

Ventilation System

− Positive Crankcase Ventilation System

Check

P.17-74

.

Q: Is the positive crankcase ventilation system,?

YES : Go to Step 14.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 14. Check the evaporative emission control system.
Refer to GROUP 17, Emission Control

− Evaporative Emission

Control System

−Purge Control System Check (Purge Flow

Check)

P.17-77

.

Q: Is the purge control system normal?

YES : Go to Step 15.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.