Content .. 327 328 329 330 ..

Mitsubishi Montero Sport (2004+). Manual - part 329

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-729

CIRCUIT OPERATION

• The malfunction indicator lamp (SERVICE

ENGINE SOON or Check Engine Lamp) power is
supplied from the ignition switch.

• The PCM controls the ground of the malfunction

indicator lamp (SERVICE ENGINE SOON or
Check Engine Lamp) by turning the power tran-
sistor in the PCM ON and OFF.

COMMENT

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

bly that the PCM is detecting a problem in a sen-
sor or actuator, or that one of the malfunctions
listed at right has probably occurred.

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

• Short-circuit between the malfunction indicator

lamp (SERVICE ENGINE SOON or Check
Engine Lamp) and PCM.

• Malfunction of the PCM.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

AK103738AD

CONNECTOR: C-89

PCM

C-89(GR)

AK200035AB

CONNECTOR: D-08

D-08

JUNCTION BLOCK
(REAR SIDE)

AK200036AC

CONNECTORS: D-06

JUNCTION BLOCK
(FRONT SIDE)

D-06

AK200040AB

CONNECTOR: D-15

D-15(B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-730

STEP 1. 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 DTC set?

YES : Refer to Diagnostic Trouble Code Chart

P.13A-26

NO : Go to Step. 2.

STEP 2. Check for continuity at combination meter
harness side connector C-04.
(1) Disconnect the connector C-04 and measure at the harness

side.

(2) Check for the continuity between terminal No. 23 and

ground.

• Should be open loop.

Q: Does continuity exist?

YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Check harness connector C-16 at the intermediate

connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

. If intermediate connector C-16 is

in good condition, repair a short circuit to ground
between combination meter connector C-04 (terminal
No. 23) and PCM connector C-89 (terminal No. 22).
Then confirm that the malfunction symptom is
eliminated.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

AK200041

22 21

CONNECTOR: C-04

C-04

HARNESS CONNECTOR:
COMPONENT SIDE

AK200500

C-04 HARNESS CONNECTOR:
COMPONENT SIDE

AK200500AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-731

INSPECTION PROCEDURE 5: Cranks, Won't Start

Cranks, Won't Start Circuit

• Refer to, Ignition circuit

P.13A-828

CIRCUIT OPERATION

• Refer to, Ignition circuit

P.13A-828

COMMENT

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

bly no spark, fuel delivery, or fuel quality prob-
lems. In addition, foreign materials (water,
kerosene, etc.) may be mixed with the fuel.

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

• Malfunction of the ignition system.

• Malfunction of the fuel pump system.

• Malfunction of the injector system.

• Malfunction of the PCM.

• Contaminated fuel.

• Malfunction of the immobilizer system.

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 : Check the battery. Refer to GROUP 54, Battery

−

Battery Check

P.54-5

. Then confirm that the

malfunction symptom is eliminated.

STEP 2. Check the timing belt for breaks.
Q: Is the timing belt good condition?

YES : Go to Step 3.
NO : Replace timing belt. Then confirm that the malfunction

symptom is eliminated.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-732

STEP 3 Using scan tool MB991958, check data list.

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) Check the following items in the data List. Refer to Data List

Reference Table

P.13A-839

a. Item 16: Power Supply Voltage.
b. Item 22: Crankshaft Position Sensor.

c. Item 21: Engine Coolant Temperature Sensor.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they 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 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 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

Content .. 327 328 329 330 ..