Mitsubishi Eclipse. Manual — part 537

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-691

STEP 22. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern (Refer to

Diagnostic Function

− OBD-ll Drive Cycle − Procedure 1 −

Evaporative Emission System Leak Monitor

P.13B-7

).

(2) Read the diagnostic trouble code.
Q: Is diagnostic trouble code P0451 set?

YES : Go to Step 2.
NO : This diagnosis is complete.

DTC P0452: Evaporative Emission Control System Pressure Sensor Low Input

AC001944

CHECK VALVE A

CHECK
VALVE B

EVAPORATIVE
EMISSION CANISTER

FUEL TANK

EVAPORATIVE
EMISSION
VENTILATION
SOLENOID

EVAPORATIVE EMISSION
PURGE SOLENOID

INTAKE MANIFOLD

SYSTEM DIAGRAM <VEHICLES WITHOUT INTAKE MANIFOLD TUNING SYSTEM>

A

B

C

D

E

F

G

Q

R

I

H

K

J

L

N

O

M

P

AG

FUEL TANK DIFFERENTIAL
PRESSURE SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-692

AC106496

CHECK VALVE A

CHECK
VALVE B

EVAPORATIVE
EMISSION CANISTER

FUEL TANK

EVAPORATIVE
EMISSION
VENTILATION
SOLENOID

EVAPORATIVE EMISSION
PURGE SOLENOID

INTAKE MANIFOLD

SYSTEM DIAGRAM <VEHICLES WITH INTAKE MANIFOLD TUNING SYSTEM>

B

C

E

F

G

Q

R

I

H

K

J

L

N

O

M

P

AE

FUEL TANK DIFFERENTIAL
PRESSURE SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-693

Fuel Tank Differential Pressure Sensor Circuit

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-694

.

CIRCUIT OPERATION

• A 5-volt voltage is supplied to the power terminal

of the fuel tank differential pressure sensor (ter-
minal 3) from the ECM (terminal 42) <M/T> or
PCM (terminal 46) <A/T>. The ground terminal
(terminal 2) is grounded with the ECM (terminal
49) <M/T> or PCM (terminal 57) <A/T>.

• A voltage proportional to the pressure in the fuel

tank is sent from the output terminal of the fuel
tank differential pressure sensor (terminal 1) to
the ECM (terminal 93) <M/T> or PCM (terminal
92) <A/T>.

.

TECHNICAL DESCRIPTION

• To judge if the fuel tank differential pressure sen-

sor is defective, the ECM <M/T> or PCM <A/T>
monitors the fuel tank differential pressure sensor
output voltage.

• Based on the test conditions and judgment crite-

ria, the ECM <M/T> or PCM <A/T> judges if the
fuel tank differential pressure sensor output volt-
age is normal.

.

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

AC001741 AJ

CONNECTOR: C-28

AC001689AN

CONNECTORS: C-58, C-62<M/T>,
C-55, C-59 <A/T>

ECM <M/T>
OR
PCM <A/T>

C-62
<M/T>

C-58 <M/T>,
C-59 <A/T>

C-55
<A/T>

AC001991

CONNECTOR: C-90

CONNECTOR
BLOCK (LH)

AI

AC001787AD

CONNECTOR: D-16

AC103356

FUEL TANK

AD

CONNECTOR: D-18
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR