Mitsubishi Outlander XL. Manual — part 395

Q:Is the compression pressure normal?

YES:

Check the following items, and repair or replace the

defective items.

a
.

Check if fuel is contaminated.

b
.

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 7: Unstable Idle (rough idle, hunting).

M11310100284USA0000010000

COMMENT

｠

In cases such as the above, the cause is probably
the air/fuel mixture. Other systems affecting idle
quality include the ignition system and
compression.

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

｠

Malfunction of the fuel pump system.

｠

Malfunction of the ignition system.

｠

Malfunction of the injector system.

｠

Poor compression

｠

Malfunction of the purge control system

｠

Malfunction of the EGR system

｠

Improper operation of the PCV valve.

｠

Malfunction of the charging system.

｠

Vacuum leak.

｠

Contaminated fuel.

｠

Malfunction of the ECM.

DIAGNOSIS

Required Special Tools:

｠

MB991958: Scan Tool (M.U.T.-III Sub Assembly)

｠

MB991824: V.C.I.

｠

MB991827: USB Cable

｠

MB991910: Main Harness A

｠

MB992110: Power Plant ECU Check Harness

STEP 1. Check if the EGR valve sounds during initialization.

Q:Is the initialization sound heard in the EGR valve?

YES:

Go to Step 2.

NO:

Refer to GROUP 17, Emission Control - EGR Valve

(Stepper Motor) Check P.17c-14.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-775

SYMPTOM PROCEDURES

STEP 2. Using scan tool MB991958, read the diagnostic
trouble code (DTC)

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition switch is to the "LOCK" (OFF) position before
connecting 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.13Ab-44.

NO:

Go to Step 3.

STEP 3. Using scan tool MB991958, check actuator test
items 1, 2, 3, 4, 5, 6: Injector.

(1)

Turn the ignition switch to the "ON" position.

(2)

Check following items in the actuator test. Refer to Actuator
Test Reference Table P.13Ab-857.

a
.

Item 01: Injector.

b
.

Item 10: Evaporative emission purge solenoid

(3)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Are they operating properly?

YES:

Go to Step 4.

NO:

Repair or replace it. Then confirm that the

malfunction symptom is eliminated.

STEP 4. 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.13Ab-837.

a
.

Item 05: Intake Air Temperature Sensor.

b
.

Item 06: Engine Coolant Temperature Sensor.

c
.

Item 10: Mass Airflow Sensor

d
.

Item 76: A/C Switch

(3)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Are they operating properly?

13Ab-776

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

SYMPTOM PROCEDURES

YES:

Go to Step 5.

NO:

Repair or replace it. Then confirm that the

malfunction symptom is eliminated.

STEP 5. Check the fuel pressure.
Refer to Fuel Pressure Test P.13Aa-17.

Q:Is the fuel pressure normal?

YES:

Go to Step 6.

NO:

Repair or replace it. Then confirm that the

malfunction symptom is eliminated.

STEP 6. Check the ignition timing.
Refer to GROUP 11A, On-vehicle Service - Ignition Timing
Check P.11A-14.

Q:Is the ignition timing normal?

YES:

Go to Step 7.

NO:

Check for installed conditions of the timing belt.

Then confirm that the malfunction symptom is eliminated.

STEP 7. Measure the voltage at ECM connector B-10 by
using check harness special tool MB992110.

ECM

ZK603234AA00

Body side harness

MB992110

(1)

Disconnect all ECM connectors. Connect the check harness
special tool MB992110 between the separated connectors.

(2)

Start the engine and run at idle.

NOTE:

Vehicles for Canada, the headlight, taillight,

etc. remain lit even when the lighting switch is in "OFF"
position but this is no problem for checks.

ZK603189

16 15 14 13 12 11 10 9 8 7 6 5 4 3

2

1

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

Special tool 64-pin
connector:
component side

AA00

(3)

Measure the voltage between terminal No. 60 and ground.

a
.

Engine: warming up

b
.

Radiator fan: stopped

c
.

Headlight switch: OFF to ON

d
.

Rear defogger switch: OFF to ON

e
.

Stoplight switch: OFF to ON

｠

Voltage rises.

(4)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the harness measured voltage within the specified

range?

YES:

Go to Step 8.

NO:

Replace the generator. Then confirm that the

malfunction symptom is eliminated.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-777

SYMPTOM PROCEDURES

STEP 8. Check the spark plugs.
Refer to GROUP 16, Ignition System - On-vehicle service -
Spark Plug Check P.16c-4.

Q:Are there any abnormalities?

YES:

Replace the spark plug. Then confirm that the

malfunction symptom is eliminated.

NO:

Go to Step 9.

STEP 9. Check the ignition coil.

(1)

Remove the intake manifold.

(2)

Refer to GROUP 16, Ignition System - On-vehicle service -
Ignition Coil Check P.16c-3.

Q:Are there any abnormalities?

YES:

Replace the ignition coil. Then confirm that the

malfunction symptom is eliminated.

NO:

Go to Step 10.

STEP 10. Check the compression pressure.
Refer to GROUP 11A, On-vehicle service - Compression
Pressure Check P.11A-17.

Q:Is the compression pressure normal?

YES:

Go to Step 11.

NO:

Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 11. Check the positive crankcase ventilation valve.
Refer to GROUP 17, Emission Control System - Positive
Crankcase Ventilation Check P.17c-8.

Q:Is the positive crankcase ventilation valve?

YES:

Go to Step 12.

NO:

Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 12. Check the purge control system.
Refer to GROUP 17, Emission Control System - Purge Control
System Check (Purge Flow Check) P.17c-11.

Q:Is the purge control system normal?

YES:

Check the following items, and repair or replace the

defective items.

a
.

Vacuum leak.

b
.

Check if fuel is contaminated.

c
.

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.

13Ab-778

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

SYMPTOM PROCEDURES