Mitsubishi Eclipse. Manual - part 256

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-517

NOTE: Check harness after checking intermediate connectors 
D-16, C-90 and C-28. If intermediate connectors are damaged, 
repair or replace them. Refer to GROUP 00E, Harness Con-
nector Inspection 

P.00E-2

. Then go to Step 12.

Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 12.
NO :  Repair it. Then go to Step 12.

STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13A-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0446 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

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

AC001943

A

B

C

EVAPORATIVE EMISSION 
PURGE SOLENOID

EVAPORATIVE 
EMISSION CANISTER

EVAPORATIVE 
EMISSION 
VENTILATION 
SOLENOID

FUEL TANK

CHECK VALVE A

CHECK 
VALVE B

INTAKE MANIFOLD

SYSTEM DIAGRAM

D

E

F

G

I

H

L

N

M

K

J

O

P

CHAMBER

AC

FUEL TANK DIFFRENTIAL 
PRESSURE SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-518

Fuel Tank Differential Pressure Sensor Circuit

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-519

.

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 81) <M/T> or 
PCM (terminal 46) <A/T>. The ground terminal 
(terminal 2) is grounded with the ECM (terminal 
92) <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 61) <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

• 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

AC001741 AJ

CONNECTOR: C-28

AC001689

CONNECTORS: C-56, C-60<M/T>,
C-54, C-57 <A/T>

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

AK

C-60 
<M/T>

C-56 <M/T>, 
C-57<A/T>

C-54
<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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-520

 Sensor (The sensors below are determined to be 

normal)

• Volme airflow sensor

• Barometric pressure sensor

• Intake air temperature sensor

• Engine coolant temperature sensor

.

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Test Conditions: Electrical noise

• Throttle valve is closed.

• Vehicle speed is 1.5 km/h (0.9 mph) or less.

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

AC210307

RATIONALITY - NOISE