Mitsubishi Montero Sport (2004+). Manual — part 248

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-405

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• The engine coolant temperature − intake air tem-

perature is 5

°C (9°F) or less when the engine is

started.

• The engine coolant temperature is between

−10°C (14°F) and 36°C (97°F) when the engine is

started.

• Engine coolant temperature is higher than 60°C

(140

°F).

• Maximum vehicle speed is higher than 30km/h

(17mph) after the starting sequence has been
completed.

Judgement Criteria

• The fuel tank temperature − engine coolant tem-

perature is 15

°C (27°F) or less when the engine

is started.

.

START

NO

YES

YES

YES

YES

NO

NO

NO

END

NO

YES

YES

NO

MALFUNCTION

GOOD

MONITORING

CONDITIONS

“FUEL TEMP. AT

ENGINE START” -

“ENGINE COOLANT TEMP. AT

ENGINE START”

> 15˚C (27˚F)

ENGINE COOLANT TEMP.

> =60˚C (140˚F)

ENGINE COOLANT TEMP.

> =60˚C (140˚F)

MAX.VEHICLE SPEED

> 30km/h (17mph)

MAX.VEHICLE SPEED

> 30km/h (17mph)

AK301444

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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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:)

• Fuel tank temperature sensor failed.

• Open or shorted fuel tank temperature sensor cir-

cuit, or harness damage or connector damage.

• PCM failed.

NOTE: A diagnostic trouble code (DTC) could be
output if the engine coolant is changed as indicated
below. Because this is not a failure, the DTC must be
erased.
Make sure to test drive the vehicle in accordance
with the drive cycle pattern in order to verify that a
DTC will not be output.

.

•

The engine and the radiator have been flushed
repeatedly when the engine coolant temperature
was high (or the fuel tank temperature was high).

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
4A: Fuel Tank 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

4A, Fuel Tank Temperature Sensor.

• With the engine cool, the fuel tank temperature should

be approximately the same as ambient air temperature.

(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-407

STEP 2. Measure the sensor output voltage at fuel tank
temperature sensor connector E-30 by backprobing.
(1) Do not disconnect the connector E-30.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground by

backprobing.

• When fuel tank temperature is 0°C (32°F), voltage

should measure 2.7 and 3.1 volts.

• When fuel tank temperature is 20°C (68°F), voltage

should measure 2.1 and 2.5 volts.

• When fuel tank temperature is 40°C (104°F), voltage

should measure 1.6 and 2.0 volts.

• When fuel tank temperature is 80°C (176°F), voltage

should measure 0.8 and 1.2 volts.

(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 E-30 at the fuel tank 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 12.

AK200019

3 2 1

CONNECTOR: E-30

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

E-30

1 2 3

AK000577

E-30 HARNESS
CONNECTOR:
HARNESS SIDE

AC

AK200019

3 2 1

CONNECTOR: E-30

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

E-30

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-408

STEP 4. Using scan tool MB991958, check data list item
4A: Fuel Tank 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

4A, Fuel Tank Temperature Sensor.

• With the engine cool, the fuel tank temperature should

be approximately the same as ambient air temperature.

(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 12.

STEP 5. Check connector E-30 at fuel tank 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 12.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

AK200019

3 2 1

CONNECTOR: E-30

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

E-30