Mitsubishi Montero (2004+). Manual — part 338

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-839

• Defective malfunction indicator lamp (service

engine soon or check engine lamp) circuit.

• Connector damage.

• 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

STEP 1. Using scan tool MB991958, check data list item 16:
Power Supply Voltage.

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) Set scan tool MB991958 to the data reading mode for item

16, Power Supply Voltage.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 2.
NO : Refer to INSPECTION PROCEDURE 28

− Power

Supply System and Ignition Switch-IG System

P.13A-908

.

STEP 2. Check the burned-out bulb.
Q: Is the bulb normal?

YES : Go to step 3.
NO : Replace the bulb. Then confirm that the malfunction

symptom is eliminated.

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-840

STEP 3. Check harness connector D-03, D-04 at the
combination meter for damage.
Q: Is the harness connector in good condition?

YES : Go to step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK304354

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D-03(GR)

CONNECTOR: D-03

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

AK304355

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D-04(GR)

CONNECTOR: D-04

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-841

STEP 4. Measure the power supply voltage at combination
meter harness side connector D-03.
(1) Disconnect the connector D-03 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 62 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 5.
NO : Check harness connectors D-210 and D-208 at

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

P.00E-2

. If intermediate

connectors D-210 and D-208 are in good condition,
repair it because of open circuit between ignition
switch connector D-204 (terminal No. 2) and
combination meter connector D-03 (terminal No. 62).
Then confirm that the malfunction symptom is
eliminated.

STEP 5. Check harness connector D-132 at the PCM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK304354

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D-03(GR)

CONNECTOR: D-03

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

AKX01503

D-03 HARNESS
CONNECTOR:
COMPONENT SIDE

AC

5857 565554

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AK200938

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AB

CONNECTOR: D-132

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-132(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-842

STEP 6. Measure the power supply voltage at PCM
connector D-132.
(1) Disconnect the connector D-132 and measure at the

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 7 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Check harness connectors E-111 at intermediate

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

P.00E-2

. If intermediate connectors E-111

is in good condition, repair an open circuit between
combination meter connector D-04 (terminal No. 38)
and PCM connector D-132 (terminal No. 7). Then
confirm that the malfunction symptom is eliminated.

AK200938

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AB

CONNECTOR: D-132

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-132(GR)

AK201457

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D-132 HARNESS CONNECTOR:
COMPONENT SIDE

AK201457AB

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