Mitsubishi Outlander GS45X. Manual - part 955

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-753

STEP 3. Measure the power supply voltage at data link
connector C-125.
(1) Measure voltage between terminal No. 16 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 4.
NO : Repair an open circuit between ETACS-ECU

connector C-317 (terminal No. 8) and data link
connector C-125 (terminal No. 16). Then confirm that
the malfunction symptom is eliminated.

STEP 4. Check the continuity at data link connector C-125.
(1) Check for the continuity between terminal No. 4, No. 5 and

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Check and replace the scan tool. Then confirm that

the malfunction symptom is eliminated.

NO : Repair an open circuit or harness damage between

data link connector C-125 (terminal No. 4, No. 5) and
ground. Then confirm that the malfunction symptom is
eliminated.

INSPECTION PROCEDURE 2: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check
Engine Lamp) Does Not Illuminate Right after the Ignition Switch Is Turned to the "ON" Position.

CIRCUIT OPERATION

• The combination meter causes the malfunction

indicator lamp (SERVICE ENGINE SOON or
Check Engine Lamp) to illuminate immediately
after the ignition switch is turned to the "ON" posi-
tion occurred.

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

• Malfunction of the malfunction indicator lamp

(SERVICE ENGINE SOON or Check Engine
Lamp).

• Open or shorted malfunction indicator lamp

(SERVICE ENGINE SOON or Check Engine
Lamp) circuit.

AK700202

1 2 3 4 5 6 7 8

C-125 harness
connector:
component side

AK700203

1 2 3 4 5 6 7 8

C-125 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-754

DIAGNOSIS

STEP 1. Check the trouble symptoms.
(1) Turn the ignition switch to the "ON" position.

• The malfunction indicator lamp (SERVICE ENGINE

SOON or Check Engine Lamp) should illuminate imme-
diately after the ignition switch is turned to the "ON"
position.

(2) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the malfunction indicator lamp (SERVICE ENGINE

SOON or Check Engine Lamp) illuminate?
YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunctions

P.00-15

NO : Replace the combination meter.

INSPECTION PROCEDURE 3: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check
Engine Lamp) Remains Illuminated and Never Goes Out.

COMMENT

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

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

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

• Short in the malfunction indicator lamp (SER-

VICE ENGINE SOON or Check Engine Lamp)
circuit.

DIAGNOSIS

Required Special Tools:

• Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-755

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 any DTC set?

YES : Refer to Diagnostic Trouble Code Chart

P.13B-50

NO : Go to Step 2.

STEP 2. Check the trouble symptoms.
(1) Turn the ignition switch to the "ON" position.

• The malfunction indicator lamp (SERVICE ENGINE

SOON or Check Engine Lamp) should go out when 5
seconds have passed after the ignition switch was
turned to the "ON" position.

(2) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the malfunction indicator lamp (SERVICE ENGINE

SOON or Check Engine Lamp) go out?
YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunctions

P.00-15

NO : Replace the combination meter.

INSPECTION PROCEDURE 4: Cranks, Won't Start

Cranks, Won't Start Circuit

• Refer to INSPECTION PROCEDURE 24 − Igni-

tion Circuit System

P.13B-823

CIRCUIT OPERATION

• Refer to INSPECTION PROCEDURE 24 − Igni-

tion Circuit System

P.13B-823

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.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-756

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

• Malfunction of the immobilizer system.

• Malfunction of the fuel pump system.

• Malfunction of the ignition system.

• Malfunction of the injector system.

• Poor compression

• Contaminated fuel.

• Malfunction of the ECM.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).

CAUTION

the engine for at least 2 sec.

(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.13B-50

NO : Go to Step 2.

STEP 2. Check harness connector A-24X at injector relay
for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

Content .. 953 954 955 956 ..