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Mitsubishi Montero Sport (2004+). Manual - part 332

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-741

STEP 9. Check the injector.
(1) Disconnect the injector connector, which deviates from the

standard value at Step 8.

(2) Measure the resistance between injector side connector

terminal No. 1 and No. 2.

Standard value: 13

− 16 ohms [at 20°C (68°F)]

Q: Is the resistance between 13 and 16 ohms [at 20

°C

(68

°F)]?

YES : Go to Step 10.
NO : Replace the injector.Then confirm that the malfunction

symptom is eliminated.

STEP 10. Check harness connector A-70 or A-71 or A-72 or
A-73 or A-74 or A-75 at injector for damage.
Check the injector connector, which deviates from the standard
value at Step 8.
Q: Is the harness connector in good condition?

YES : Repair harness wire between injector intermediate

connector and 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 A-04 at 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.

AK200022

CONNECTORS: A-70, A-71, A-72, A-73, A-74,
A-75

A-70(GR)

A-71(GR)

A-72(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

A-73(GR)

A-74(GR)

A-75(GR)

AK000456

1 2

INJECTOR SIDE
CONNECTOR

AK200022

CONNECTORS: A-70, A-71, A-72, A-73, A-74,
A-75

A-70(GR)

A-71(GR)

A-72(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

A-73(GR)

A-74(GR)

A-75(GR)

AK200014

2 1
6 5

4 3
8

CONNECTOR: A-04

FEMALE SIDE
CONNECTOR

A-04(B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-742

STEP 12. Check harness connector C-89 at PCM 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.

STEP 13. Check for harness damage between injector
connector and PCM connector.

a. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 3) and PCM connector C-89 (ter-
minal No. 1) when checking No. 1 cylinder injector.

b. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 2) and PCM connector C-89 (ter-
minal No. 9) when checking No. 2 cylinder injector.

c. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 1) and PCM connector C-89 (ter-
minal No. 24) when checking No. 3 cylinder injector.

d. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 7) and PCM connector C-89 (ter-
minal No. 2) when checking No. 4 cylinder injector.

e. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 6) and PCM connector C-89 (ter-
minal No. 10) when checking No. 5 cylinder injector.

f. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 5) and PCM connector C-89 (ter-
minal No. 25) 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 compression pressure.

d. Check fuel lines for clogging.
e. Check if the foreign materials (water,

kerosene, etc.) got into fuel.

Then confirm that the malfunction symptom is

eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

AK103914

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK200014

2 1
6 5

4 3
8

CONNECTOR: A-04

FEMALE SIDE
CONNECTOR

A-04(B)

AK103914

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-743

INSPECTION PROCEDURE 7: Hard Starting

COMMENT

• In cases such as the above, the cause is usually

either weak spark, improper air-fuel mixture or
low compression.

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

• Malfunction of the ignition system.

• Malfunction of the injector system.

• Poor fuel quality. (Contamination)

• Poor compression.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Measure the battery positive voltage.
(1) Measure the battery positive voltage during cranking.

• The voltage should remain greater than 8 volts while the

engine is cranked.

Q: Dose the voltage remain greater than 8 volts while the

engine is cranked?
YES : Go to Step 2.
NO : Refer to GROUP 54, Battery

− Battery Check

P.54-5

STEP 2. 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 the "LOCK" (OFF) position.
Q: Is DTC set?

YES : Refer to Diagnostic Trouble Code Chart

P.13A-26

NO : Go to Step 3.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-744

STEP 3. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to

Actuator Test Reference Table

P.13A-854

a. Item 07: Fuel Pump.

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

YES : Go to Step 4.
NO : Repair or Replace. Then confirm that the malfunction

symptom is eliminated.

STEP 4. Using scan tool MB991958, check data list.
(1) Turn the ignition switch the "ON" position.
(2) Check the following items in the data list. Refer to Data List

Reference Table

P.13A-839

a. Item 21: Engine Coolant Temperature Sensor.

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

YES : Go to Step 5.
NO : Repair or Replace. Then confirm that the malfunction

symptom is eliminated.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

AK303629AB

MB991911

MB991827

MB991824

16-PIN

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