Mitsubishi Lancer Evolution X. Manual — part 338
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-417
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine speed is 3,500 r/min or lower.
• Accelerator pedal is depressed.
• Mass airflow is between 13 and 45 g/sec.
• More than 3.5 seconds have elapsed after the
above-mentioned three conditions have been
met.
• Intake air temperature is higher than −10° C
(14° F).
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
• Under the closed loop air/fuel ratio control.
• Vehicle speed is 1.5 km/h (1.0 mph) or more.
• The ECM monitors the maximum 5 times per
drive cycle under these conditions.
• Short-term fuel trim is higher than −
20 percent
and lower than +17 percent.
• The cumulative mass airflow is higher than 1,638
g.
Judgement Criterion
• When the monitoring for 10 seconds is carried
out 5 times, the frequency ratio of rear and front
signals is the specified value or more.
NOTE: The specified value varies depending on the
average air flow rate.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 3
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Catalytic converter deteriorated.
• Heated oxygen sensor failed.
• Exhaust leak.
• ECM failed.
Start
Monitoring
conditions
Malfunction
Good
End
No
No
Yes
Yes
Rf > R0
Calculate average frequency
ratio (Rf = Fr/Ff) of specified times
R0: Average threshold value
AK604337
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-418
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Replace the catalytic converter.
(1) Replace the catalytic converter.
(2) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function − OBD-II Drive Cycle − Pattern 3
(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0420 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
NO : The inspection is complete.
DTC P0441: Evaporative Emission Control System Incorrect Purge Flow
.
TECHNICAL DESCRIPTION
• ECM detects a stuck open condition of evapora-
tive emission purge solenoid and a stuck closed
condition of evaporative emission ventilation
solenoid by pressure change in fuel tank.
• Stuck open evaporative emission purge solenoid
is judged through monitoring leak of evaporative
emission system.
• Stuck closed evaporative emission ventilation
solenoid is judged after 20 seconds from end of
monitoring leak of evaporative emission system,
or of usual operation of evaporative emission
purge solenoid from ON to OFF.
.
DESCRIPTIONS OF MONITOR METHODS
Fuel tank pressure decreases largely during
purge-cut.
.
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)
• Fuel tank differential pressure sensor monitor
AK704277
AB
Evaporative emission
purge solenoid
Connector: B-12
B-12 (B)
AK704278
Evaporative emission
ventilation solenoid
Canister
assembly
AB
Connector: F-23
F-23 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-419
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
• Engine is running.
• ON duty cycle of the evaporative emission purge
solenoid is 0 percent.
• 20 seconds have elapsed since the duty cycle of
the evaporative emission purge solenoid has
turned to 0 percent.
Judgement Criterion
• The pressure in the fuel tank is −1.96 kPa (−
0.58
in.Hg) or less for 0.1 second.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 4
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Evaporative emission purge solenoid failed.
• Evaporative emission ventilation solenoid failed.
• Fuel tank differential pressure sensor circuit
related part(s) failed.
AK604338
Good
Malfunction
End
No
No
No
No
No
Fuel-tank pressure
< -1.96kPa (-0.58 in. Hg)
Reverting pressure
detected during
evap. monitor?
Start
Yes
Yes
Yes
Yes
Yes
Continuous
failure for 100msec
Monitoring conditions for
malfunction detection?
Monitoring conditions for
pass judgement?
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-420
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0451 set?
YES : Refer to DTC P0451 − Fuel Tank Differential Pressure
Circuit Range/Performance Problem
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, check data list item 52:
Fuel Tank Differential Pressure Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Remove the fuel cap.
(3) Set scan tool MB991958 to the data reading mode for item
52, Fuel Tank Differential Pressure Sensor.
• The fuel tank differential pressures should be 1,500 and
3,500 millivolts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the fuel tank pressure between 1,500 and 3,500
millivolts?
YES : Go to Step 3.
NO : Refer to DTC P0451 − Fuel Tank Differential Pressure
Circuit Range/Performance Problem
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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