Mitsubishi Lancer Evolution X. Manual - part 355

 

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Mitsubishi Lancer Evolution X. Manual - part 355

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-485

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 50 per-

cent.

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

AK704743

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-486

• 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.

.

FAIL-SAFE AND BACKUP FUNCTION

• None

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-ll Drive Cycle − 

Pattern 4 

P.13A-9

.

.

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.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-487

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

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 "Special Function"
(7) Select "Evap Leak Monitor"
(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 Mon. Completed. Test Failed and DTCs 

Set" 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.13A-48

. If no 

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

NO <"Evap Leak Mon. Completed. 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 Mon. Discontinued. Retest again from 
the first" 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.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-488

STEP 2. Test check valve.
(1) Check valve is a one-way check valve.

(2) Check valve should allow air to flow in only one direction.
Q: Does check valve allow air to pass in one direction 

only?
YES : Go to Step 3 .
NO :  Replace check valve. Then go to Step 14 .

STEP 3. Check for leaks in evaporative emission hoses A 
and B.
Use a hand vacuum pump to test each hose A and B.
Q: Do the hoses hold vacuum?

YES : Go to Step 4 .
NO :  Replace any damaged hose. Then go to Step 14 .

STEP 4. Check the evaporative emission purge solenoid 
for leaks.
Refer to GROUP 17, Emission Control − Evaporative Emission 

Control System − Evaporative Emission Purge Solenoid Check 

P.17-76

.

Q: Is the evaporative emission purge solenoid operating 

properly?
YES : Go to Step 5 .
NO :  Replace the evaporative emission purge solenoid. 

Then go to Step 14 .

AK704695

Check valve

AB

AK604287AB

Check valve

AK704688

Hose B

Hose A

AB

 

 

 

 

 

 

 

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