Mitsubishi Montero Sport (2004+). Manual — part 282

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-541

DTC P0451: Evaporative Emission Control System Pressure Sensor Range/Performance

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-542

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-543

.

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

• Detect malfunction if change of fuel tank differen-

tial pressure sensor output voltage during idling
stays large during specified go/stop operations.

.

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-544

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Test Conditions: Electrical noise

• Throttle valve is closed.

• Vehicle speed is less than 1.5 km/h (0.93 mph).

START

YES

NO

NO

OFF-IDLING CONDITION

IDLING CONDITION?

F1 = 0

END

NO

NO

YES

YES

MALFUNCTION

F1 > 20

SPECIFIED TIMES

MONITORED

FTPS OUTPUT

VOLTAGE > 0.2V

FLUCTUATION

NO

YES

YES

F1 = F1 + 1

GOOD

YES

NO

OFF-IDLING CONDITION

AC306647

RATIONALITY - NOISE