Mitsubishi Montero Sport (2004+). Manual — part 175

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-113

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine coolant temperature was 7°C (45°F) or

more immediately before the engine was stopped
at the last drive.

• Engine coolant temperature was 7°C (45°F) or

more when the engine started.

Judgement Criteria

• Engine coolant temperature fluctuates within 1°C

(34

°F) after 5 minutes have passed since the

engine was started.

• However, time is not counted if any of the follow-

ing conditions are met.

1. Intake air temperature is 60

°C (140°F) or

more.

2. Volume airflow sensor output frequency is 70

Hz or less.

3. During fuel shut-off operation.

• The PCM monitors for this condition once during

the drive cycle.

.

START

END

YES

NO

NO

YES

MALFUNCTION

GOOD

300secs HAVE PASSED?

|dT| < 1˚C(34˚F)

MONITORING CONDITIONS?

START MEASURING THE MINIMUM AND MAXIMUM

TEMPERATURE FROM ENGINE START

CALCULATE THE DIFFERENCE OF THE MINIMUM AND

THE MAXIMUM TEMPERATURE FROM ENGINE START;dT

YES

NO

AK303237

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-114

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function

−OBD-II Drive

Cycle

−Procedure 6−Other Monitor

P.13A-4

.

.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

• Engine coolant temperature sensor failed.

• Harness damage in engine coolant temperature

sensor circuit, or connector damage.

• PCM failed.

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 21:
Engine Coolant Temperature Sensor.

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

21, Engine Coolant Temperature Sensor.

• The engine coolant temperature and temperature

shown with the scan tool should approximately match.

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

YES : It can be assumed that this malfunction is intermittent.

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

P.00-7

.

NO : Go to Step 2.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-115

STEP 2. Measure the sensor output voltage at engine
coolant temperature sensor connector A-67 by
backprobing.
(1) Do not disconnect the connector A-67.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 1 and ground by

backprobing.

• When engine coolant temperature is −20°C (−4°F), volt-

age should measure 3.9 and 4.5 volts.

• When engine coolant temperature is 0°C (32°F), voltage

should measure 3.2 and 3.8 volts.

• When engine coolant temperature is 20°C (68°F), volt-

age should measure 2.3 and 2.9 volts.

• When engine coolant temperature is 40°C (104°F), volt-

age should measure 1.3 and 1.9 volts.

• When engine coolant temperature is 60°C (140°F), volt-

age should measure 0.7 and 1.3 volts.

• When engine coolant temperature is 80°C (176°F), volt-

age should measure 0.3 and 0.9 volt.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?

YES : Go to Step 3.
NO : Go to Step 5.

STEP 3. Check connector A-67 at the engine coolant
temperature sensor for damage.
Q: Is the 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 go to Step 14.

AK104023

1

2

A-67(B)

AB

CONNECTOR: A-67

HARNESS
CONNECTOR:
COMPONENT SIDE

AK000233

A-67 HARNESS
CONNECTOR:
HARNESS SIDE

1 2

AK

AK104023

1

2

A-67(B)

AB

CONNECTOR: A-67

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-116

STEP 4. Using scan tool MB991958, check data list item 21:
Engine Coolant Temperature Sensor.

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

21, Engine Coolant Temperature Sensor.

• The engine coolant temperature and temperature

shown with the scan tool should approximately match.

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

YES : It can be assumed that this malfunction is intermittent.

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

P.00-7

.

NO : Replace the PCM. Then go to Step 14.

STEP 5. Check connector A-67 at engine coolant
temperature sensor for damage.
Q: Is the 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 go to Step 14.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

AK104023

1

2

A-67(B)

AB

CONNECTOR: A-67

HARNESS
CONNECTOR:
COMPONENT SIDE