Mitsubishi Montero (2002-2004). Manual - part 746

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SYMPTOM PROCEDURES

13Ad-33

STEP 10. Check harness connector B-01 or B-02 or B-03 at
right bank injector for damage.
(1) Check the injector connector, which deviated from the

standard value listed in Step 7.

Q: Is the harness connector in good condition?

YES : Repair harness wire between injector intermediate

connector and right bank injector connector because
of harness damage. Then confirm that the
malfunction symptom is eliminated.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

STEP 11. Check harness connector B-44 at the injector
intermediate connector for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

STEP 12. Check harness connector B-11, B-33, B-35 at the
left bank injector for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 13.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK200950

B-03(GR)

B-02(GR)

B-01(GR)

CONNECTORS: B-01, B-02, B-03

HARNESS
CONNECTOR:
COMPONENT SIDE

AK200949

B-44(B)

CONNECTOR: B-44

HARNESS
CONNECTOR:
COMPONENT SIDE

AK201292

B-11(GR)

B-35(GR)

B-33(GR)

CONNECTORS: B-11, B-33, B-35

HARNESS
CONNECTORS:
COMPONENT SIDE

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SYMPTOM PROCEDURES

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STEP 13. Check the harness connector D-132 at the PCM
for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK200938

CONNECTOR: D-132

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-132(GR)

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SYMPTOM PROCEDURES

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STEP 14. Check for harness damage between injector
connector and PCM connector.

a. Check the harness wire between injector connector B-

01 (terminal No. 2) and PCM connector D-132 (terminal
No. 1) when checking No. 1 cylinder injector.

b. Check the harness wire between injector connector B-

33 (terminal No. 2) and PCM connector D-132 (terminal
No. 5) when checking No. 2 cylinder injector.

c. Check the harness wire between injector connector B-

02 (terminal No. 2) and PCM connector D-132 (terminal
No. 14) when checking No. 3 cylinder injector.

d. Check the harness wire between injector connector B-

35 (terminal No. 2) and PCM connector D-132 (terminal
No. 21) when checking No. 4 cylinder injector.

e. Check the harness wire between injector connector B-

03 (terminal No. 2) and PCM connector D-132 (terminal
No. 2) when checking No. 5 cylinder injector.

f. Check the harness wire between injector connector B-

11 (terminal No. 2) and PCM connector D-132 (terminal
No. 6) when checking No. 6 cylinder injector.

Q: Is the harness wire in good condition?

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

defective items.

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

cables.

b. Check if the injectors are clogged.

c. Check the compression pressure.

d. Check if the foreign materials (water,

kerosene, etc.) got into fuel.

e. Check the EGR valve.

Then confirm that the malfunction symptom is

eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

INSPECTION PROCEDURE 8: Unstable Idle (Rough Idle, Hunting).

COMMENT

• In cases such as the above, the cause is proba-

bly the air/fuel mixture or electronic control throt-
tle valve system. Other systems affecting idle
quality include the ignition system and compres-
sion.

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 evaporative emission purge

solenoid system.

• Malfunction of the EGR valve.

• Poor compression pressure.

• Vacuum leak.

AK200960

B-03(GR)

B-11(GR)

B-35(GR)

B-33(GR)

B-02(GR)

B-01(GR)

CONNECTORS: B-01, B-02, B-03, B-11,

B-33, B-35

HARNESS CONNECTOR:
COMPONENT SIDE

AK200938

CONNECTOR: D-132

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-132(GR)

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SYMPTOM PROCEDURES

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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 is 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-2

NO : Go to Step 3.

STEP 3. Check the engine idling state.
Q: Is it hunting remarkably?

YES : Go to Step 4.
NO : Go to Step 5.

STEP 4. Check the following items.
(1) Carry out the following cleaning.

a. Refer to GROUP 13A, On-vehicle Service

− Clean the

throttle valve area

P.13Aa-11

(2) After cleaning, confirm that the malfunction symptom is

eliminated.

Q: Is the malfunction symptom resolved?

YES : The check is completed.
NO : Check the following items, and repair or replace the

defective items.

a. Broken intake manifold gasket.
b. Broken air intake hose.

c. Broken vacuum hose.

d. Positive crankcase ventilation valve does not

operate.

Then confirm that the malfunction symptom is

eliminated.

ACX01539

16-PIN

MB991502

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