Mitsubishi Outlander GS45X. Manual — part 900

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-533

.

TECHNICAL DESCRIPTION

• The fuel tank may be under a slight pressure or

vacuum depending on the state of the Evapora-
tive Emission (EVAP) System. The ECM monitors
and responds to these pressure/vacuum
changes. If the pressure/vacuum varies from the
specified range, the ECM will set DTC P0455.

• The ECM energizes the evaporative emission

ventilation solenoid to shut off the evaporative
emission canister outlet port.

• The evaporative emission purge solenoid is acti-

vated to apply engine manifold vacuum to the
EVAP system.

• When the fuel system develops a vacuum of 2

kPa (0.29 psi), the evaporative emission purge
solenoid is turned "off" and the fuel system vac-
uum is maintained at 2 kPa (0.29 psi).

• The ECM determines whether there is a leak or

clog in the fuel system by measuring the change
in vacuum inside the fuel tank.

• The test is stopped when fuel vapor pressure is

determined to be too high.

.

DESCRIPTIONS OF MONITOR METHODS

• Depressurizing EVAP system by intake manifold

negative pressure is impossible within specified
period.

.

MONITOR EXECUTION

• Once per driving cycle.

.

MONITOR EXECUTION CONDITIONS
(OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• Not applicable

Sensor (The sensors below are determined to be

normal)

• Not applicable

.

AK900147

B-07 (B)

Connector: B-07

AD

Evaporative emission
purge solenoid

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-534

DTC SET CONDITIONS

Logic Flow Chart (Monitor Sequence)

.

Check Conditions

• Engine coolant temperature is less than 36°C

(97

°F) when the engine is started.

• Engine coolant temperature is more than 60°C

(140

°F). <Amount of remaining fuel is 15 − 40

percent of capacity when the engine is started>

• Engine coolant temperature is more than 20°C

(68

°F). <Amount of remaining fuel is 40 − 85 per-

cent of capacity when the engine is started>

• Intake air temperature is less than 36°C (97°F)

when the engine is started.

• Volumetric efficiency is between 20 and 60 per-

cent.

• Engine speed is more than 1,594 r/min.

AK604523

Start

Yes

No

Monitoring
conditions?

Depressurize fuel tank pressure

Yes

Yes

No

No

Gross leak

monitoring conditions

Shut purge line

Specified times

have passed

Malfunction

(Gross leak)

Measure reverting
pressure: PFT

Yes

Yes

No

No

PFT > PT

Specified times

monitored

Malfunction

End

Good

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-535

• When the evaporative emission purge solenoid

and evaporative emission ventilation solenoid are
closed, the change of the pressure in the fuel
tank is less than 451 Pa (0.13 in.Hg). <Amount of
remaining fuel is 15

− 40 percent of capacity

when the engine is started>

• When the evaporative emission purge solenoid

and evaporative emission ventilation solenoid are
closed, the change of the pressure in the fuel
tank is less than 324 Pa (0.09 in.Hg). <Amount of
remaining fuel is 40

− 85 percent of capacity

when the engine is started>

• Barometric pressure is more than 76 kPa (22.4

in.Hg).

• Intake air temperature is more than 5°C (41°F).

• Fuel temperature is less than 36°C (97°F).

• Fuel tank differential pressure sensor output volt-

age is between 1.0 and 4.0 volts.

• At least 10 seconds have passed since the last

monitor was complete.

• Monitoring time: 150 seconds

Judgment Criterion

• The fuel tank internal pressure is more than

−1961 Pa (−0.58 in.Hg) after the evaporative

emission purge solenoid has been driven when
the fuel tank and vapor line were closed.

.

OBD-ll DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-ll Drive Cycle −

Pattern 5

P.13B-11

.

.

TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CODE TO BE
SET ARE:)

• Loose fuel cap.

• Fuel cap relief pressure is incorrect.

• Fuel overflow limiter valve failed.

• Purge line or vapor line is clogged.

• Fuel tank, purge line or vapor line seal failed.

• Evaporative emission purge solenoid valve failed.

• Evaporative emission ventilation solenoid valve

failed.

• Fuel tank differential pressure sensor failed.

• Evaporative emission canister seal is faulty.

• Evaporative emission canister is clogged.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-536

STEP 1. Using scan tool MB991958, check the evaporative
emission system monitor test.

CAUTION

• To prevent damage to scan tool MB991958, always turn

the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.

• During this test, the ECM will automatically increase

the engine speed to 1,600 r/min or greater. Check that
the transaxle is set to "P" position.

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTCs using scan tool MB991958.
(4) Check that the fuel cap is securely closed (Tighten until

three clicks are heard).

(5) Start the engine.
(6) Select "System Test."
(7) Select "Evap Leak Mon."
(8) During this test, keep the accelerator pedal at the idle

position.

(9) Keep the engine speed and engine load within the specified

range. When the monitor test starts, the "In Progress" item
on scan tool MB991958 will change from "NO" to "YES".

(10) Turn the ignition switch to the "LOCK" (OFF) position, and

disconnect scan tool MB991958.

Q: Is "Evap Leak was detected." displayed on scan tool

MB991958?
YES : A malfunction has been detected during the monitor

test. Refer to the Diagnostic Trouble Code Chart and
diagnose any other DTCs that are set

P.13B-50

. If no

other DTC's have been set, go to Step 2 .

NO <"Evap Leak Monitor test passed" is displayed on
scan tool MB991958.> : The evaporative emission system

is working properly at this time. Explain to the
customer that an improperly tightened fuel cap can
cause the MIL to illuminate. Return the vehicle to the
customer.

NO <"Evap Leak Monitor discontinued. Once turn the IG
off then retest again from the beginning." is displayed
on scan tool MB991958.> : The EVAP monitor has been

interrupted during the test. Turn the ignition switch to
the "LOCK" (OFF) position once, and repeat the
monitoring from Step 1 .

AK700568AB

MB991824

MB991827

MB991910

Data link
connector