Mitsubishi Eclipse. Manual — part 265

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-553

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.13A-5

).

(2) Read the diagnostic trouble code.
Q: Is diagnostic trouble code P0452 set?

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

DTC P0453: Evaporative Emission Control System Pressure Sensor High Input

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-554

Fuel Tank Differential Pressure Sensor Circuit

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-555

.

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

• 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

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-556

Sensor (The sensors below are determined to be

normal)

• Volume airflow sensor

• Barometric pressure sensor

• Intake air temperature sensor

• Engine coolant temperature sensor

.

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Test Conditions: For Test to Run

• Intake air temperature is at between 5°C (41°F)

and 45

°C (113°F) or more.

• Engine speed is 1,600 r/min or more.

• Volumetric efficiency is between 20 and 80 per-

cent.

Judgment Criteria

• When the evaporative emission purge solenoid

valve is activating at 100 percent ratio, the fuel
differential pressure sensor output voltage
remains 4.0 volts or more for ten seconds.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function

− OBD-ll Drive Cycle −

Procedure 1

− Evaporative Emission System

Leak Monitor

P.13A-5

.

.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:

• Fuel tank differential pressure sensor failed.

• Open fuel tank differential pressure sensor cir-

cuit, or loose connector.

• ECM <M/T> or PCM <A/T> failed.

.

NO

YES

CONTINUOUS

FAILURE FOR 10 SECS

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

MONITORING

CONDITIONS

OUTPUT VOLTAGE

< 1.0V

OUTPUT VOLTAGE

> 4.0V

AC210306

RANGE CHECK - MIN/MAX