Mitsubishi Montero Sport (2004+). Manual - part 287

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-561

STEP 15. Using scan tool MB991958, check data list item 
73: Fuel Tank Differential Pressure 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) Disconnect hose E from the evaporative emission canister 

side, and plug the hose.

(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991958 to the data reading mode.

• Item 73, Fuel Tank Differential Pressure Sensor.

• The fuel tank pressures reading on the scan tool 

should be 

−3.3 to 3.3 kPa (−0.97 to 0.97 inHg).

(6) Connect an evaporative emission system pressure pump to 

the fuel filler neck and pressurize the fuel tank.

• The fuel tank pressure reading should increase.

(7) Turn the ignition switch to the "LOCK" (OFF) position. Then 

disconnect scan tool MB991958.

(8) Disconnect the evaporative emission system pressure 

pump, and reinstall the fuel cap.

(9) Connect hose E to the canister.
Q: Is the fuel tank pressure between 

−3.3 and 3.3 kPa 

(

−0.97 and 0.97 inHg)?

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 Malfunction 

P.00-7

). Then go 

to Step 16 .

NO :  Replace the PCM. Then go to Step 16 .

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AC005140

HOSE E

AC

ACX01358

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-562

STEP 16. Perform the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. (Refer to 

P.13A-4

).

(2) Read the DTC.
Q: Is DTC P0451 set?

YES : Return to Step 2 .
NO :  The procedure is complete.

DTC P0452: Evaporative Emission Control System Pressure Sensor Low Input

AC005137

AB

A

Q

O

N

P

B

C

M*

M*

E

A

D

M

E

L

K

F

G

I

H

FUEL TANK

EVAPORATIVE
EMISSION
CANISTER

EVAPORATIVE
EMISSION
PURGE SOLENOID

EVAPORATIVE
EMISSION
VENTILATION
SOLENOID

CHECK VALVE A

CHECK VALVE B

INTAKE MANIFOLD

SYSTEM DIAGRAM

J

VENT VALVE MODULE

NOTE
*: Manifold port

FUEL TANK DIFFERENTIAL
PRESSURE SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-563

AC005150

AC203236

CONNECTOR: C-16

C-16

AB

AC203241

CONNECTOR: C-71

C-71

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-564

.

CIRCUIT OPERATION

• The PCM (terminal 46) supplies a 5-volt refer-

ence signal to the fuel tank differential pressure 
sensor (terminal 3). The fuel tank differential 
pressure sensor (terminal 2) is grounded through 
the PCM (terminal 57).

• The fuel tank differential pressure sensor (termi-

nal 1) returns a voltage signal to the PCM (termi-
nal 92) that is proportional to the pressure in the 
fuel tank.

.

TECHNICAL DESCRIPTION

• The PCM monitors the fuel tank differential pres-

sure sensor output voltage.

• The PCM determines whether the fuel tank differ-

ential pressure sensor signal voltage is within 
normal operating parameters.

.

DESCRIPTIONS OF MONITOR METHODS

• Compare purge solenoid status with fuel tank dif-

ferential pressure sensor output voltage.

.

MONITOR EXECUTION

• Continuous.

.

MONITOR EXECUTION CONDITIONS (Other 
Monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Evaporative emission purge solenoid monitor

• Evaporative emission ventilation solenoid monitor

 Sensor (The sensors below are determined to be 

normal)

• Volume airflow sensor

• Barometric pressure sensor

• Intake air temperature sensor

• Engine coolant temperature sensor

.

PCM

C-90 (GR) C-91 (GR)

AC203152 AB

CONNECTORS: C-90, C-91

AC002614

CONNECTOR: E-28

FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR

AG

E-28 (B)

AC203242

CONNECTOR: E-44

AB

E-44