Mitsubishi Montero (2002-2004). Manual — part 748

TSB Revision

SYMPTOM PROCEDURES

13Ad-41

STEP 2. Using scan tool MB991502, check data list.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check the following items in the data list. Refer to GROUP

13A, Data List Reference Table

P.13Ab-29

.

a. Item 21: Engine Coolant Temperature Sensor.

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

YES : Refer to GROUP 13A, On-vehicle Service

− Clean the

throttle valve area

P.13Aa-11

.

NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

INSPECTION PROCEDURE 11: When the engine is cold, it stalls at idle (die out).

.

COMMENT

• In such cases as the above, the air/fuel mixture

may be inappropriate when the engine is cold.

.

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

• Malfunction of the electronic control throttle valve

system.

• Malfunction of the throttle body.

• Malfunction of the injector system.

• Malfunction of the ignition system.

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Check if the battery terminal is disconnected.
Q: Has the battery terminal been disconnected lately?

YES : Start the engine and let it run at idle for approximate

10 minutes after engine warm up. Then, if a
malfunction occurs, go to step 2.

NO : Go to Step 2.

ACX01539

16-PIN

MB991502

AC

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SYMPTOM PROCEDURES

13Ad-42

STEP 2. Using scan tool MB991502, read the diagnostic
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 DTC set?

YES : Refer to GROUP 13A, Diagnostic Trouble Code Chart

P.13Ab-22

.

NO : Go to Step 3.

STEP 3. Checking by operating the accelerator pedal.
Q: Does the engine stall right after the accelerator pedal is

released?
YES : Refer to GROUP13A, On-vehicle Service

− Clean the

throttle valve area

P.13Aa-11

.

NO : Go to Step 4.

STEP 4. Check the engine idling.
Q: Is the idling good enough after warm up?

YES : Go to Step 5.
NO : Refer to INSPECTION PROCEDURE 8

− Unstable

Idle (Rough Idle, Hunting)

P.13Ad-35

.

STEP 5. Using scan tool MB991502, check actuator test
items 01, 02, 03, 04, 05, 06: Injector.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check following items in the actuator test. Refer to GROUP

13A, Actuator Test Reference Table

P.13Ab-42

.

a. Item 01, 02, 03, 04, 05, 06: Injector.

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

YES : Go to Step 6.
NO : Refer to GROUP 13A, DTC P0201, P0202, P0203,

P0204, P0205, P0206 - Injector Circuit

P.13Ac-318

.

ACX01539

16-PIN

MB991502

AC

ACX01539

16-PIN

MB991502

AC

TSB Revision

SYMPTOM PROCEDURES

13Ad-43

STEP 6. Using scan tool MB991502, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to GROUP

13A, Data List Reference Table

P.13Ab-29

.

a. Item 21: Engine Coolant Temperature Sensor.

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

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

symptom is eliminated.

STEP 7. Check the fuel pressure.
Refer to GROUP 13A, On-vehicle Service

− Fuel Pressure Test

P.13Aa-13

.

Q: Is the fuel pressure normal?

YES : Go to Step 8.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

STEP 8. Check the ignition timing.
Refer to GROUP 11A, On-vehicle Service

− Ignition Timing

Check

P.11A-6

.

Q: Is the ignition timing normal?

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

defective items.

a. Check the ignition coil, spark plugs, spark plug

cables.

b. Check compression pressure.

c. Check the engine oil viscosity.

d. Check the EGR valve.

Then confirm that the malfunction symptom is

eliminated.

NO : Check that the crankshaft position sensor and timing

belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.

INSPECTION PROCEDURE 12: When the Engine Is Hot, It Stalls at Idle (Die Out).

.

COMMENT

• In cases such as the above, the ignition system,

air/fuel mixture, electronic control throttle valve
system or compression pressure may be faulty. In
addition, if the engine suddenly stalls, the cause
may also be a loose connector.

.

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

• Malfunction of the ignition system.

• Malfunction of air/fuel ratio control system.

• Malfunction of the electronic control throttle valve

system.

• Malfunction of the EGR valve.

• Vacuum leak.

• Improper connector contact.

ACX01539

16-PIN

MB991502

AC

TSB Revision

SYMPTOM PROCEDURES

13Ad-44

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Check if the battery terminal is disconnected.
Q: Has the battery terminal been disconnected lately?

YES : Start the engine and let it run at idle for approximate

10 minutes after engine warm up. Then, if a
malfunction occurs, go to step 2.

NO : Go to Step 2.

STEP 2. Using scan tool MB991502, read the diagnostic
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 DTC set?

YES : Refer to GROUP 13A, Diagnostic Trouble Code Chart

P.13Ab-22

.

NO : Go to Step 3.

STEP 3. Using scan tool MB991502, check actuator test
items 01, 02, 03, 04, 05, 06: Injector.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check following items in the actuator test. Refer to GROUP

13A, Actuator Test Reference Table

P.13Ab-42

.

a. Item 01, 02, 03, 04, 05, 06: Injector.

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

YES : Go to Step 4.
NO : Refer to GROUP 13A, DTC P0201, P0202, P0203,

P0204, P0205, P0206

− Injector Circuit

P.13Ac-318

.

STEP 4. Checking by operating the accelerator pedal.
Q: Does the engine stall right after the accelerator pedal is

released?
YES : Refer to GROUP 13A, On-vehicle Service

− Clean the

throttle valve area

P.13Ac-318

.

NO : Go to Step 5.

ACX01539

16-PIN

MB991502

AC

ACX01539

16-PIN

MB991502

AC