Mitsubishi Lancer Evolution X. Manual — part 358
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-497
• 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: 10 − 14 minutes
Judgement Criterion
• In case the amount of change in the pressure that
is monitored for a given length of time inside the
tank is beyond the specified value after sealing
off the fuel tank and the vapor line.
NOTE: The specified value varies depending on
the fuel temperature and fuel level.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 5
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CODE TO BE
SET ARE:)
• Loose fuel cap.
• Fuel cap relief pressure is incorrect.
• Malfunction of the evaporative emission canister
seal.
• Malfunction of the fuel tank, purge line or vapor
line seal.
• Malfunction of the evaporative emission ventila-
tion solenoid.
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
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MULTIPORT FUEL INJECTION (MFI)
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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
. 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
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MULTIPORT FUEL INJECTION (MFI)
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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
.
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
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STEP 5. Check for leaks in evaporative emission hoses C
and D.
Use a hand vacuum pump to test each hose C and D.
Q: Do the hoses hold vacuum?
YES : Go to Step 6 .
NO : Replace any damaged hose. Then go to Step 14 .
STEP 6. Using scan tool MB991958, check actuator test
item 15: Evaporative emission ventilation solenoid.
(1) Remove the canister cover.
(2) Remove the evaporative emission ventilation solenoid. Do
not disconnect the connector.
(3) Connect the hose of the hand vacuum pump to the canister
side nipple of the evaporative emission ventilation solenoid.
(4) Turn the ignition switch to the "ON" position.
(5) Set scan tool MB991958 to actuator test mode.
• Item 15: Evaporative Emission Ventilation Solenoid.
• While the evaporative emission ventilation solenoid
is energized, operate the hand vacuum pump and
confirm that the solenoid holds vacuum.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
(7) Disconnect the hand vacuum pump, and reinstall the
evaporative emission ventilation solenoid.
(8) Reinstall the canister cover.
Q: Did the evaporative emission ventilation solenoid hold
vacuum?
YES : Go to Step 7 .
NO : Replace the evaporative emission ventilation
solenoid. Then go to Step 14 .
AK704689
Hose C
AB
AK704690 AB
Hose D
AK704699 AB
Evaporative emission
ventilation solenoid
Canister
side nipple
Evaporative emission
ventilation solenoid
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