Mitsubishi Lancer Evolution X. Manual — part 389
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-621
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 P0461 set?
YES : Go to Step 2.
NO : Go to Step 4.
STEP 2. Check fuel gauge.
Q: Is the fuel gauge functioning?
YES : Go to Step 3.
NO : Refer to GROUP 54A, Combination Meter − Trouble
Symptom Chart
.
STEP 3. Check the trouble symptoms.
Check that the fuel gauge operates correctly.
Q: Does the fuel gauge operates correctly?
YES : It can be assumed that this malfunction is
intermittent. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points − How to
Cope with Intermittent Malfunctions
.
NO : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Codes Registration Judgment Table <Vehicles
or GROUP 42C, Diagnosis − ID
Codes Registration Judgment Table <Vehicles with
WCM>
. Then go to Step 6.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-622
STEP 4. Check the fuel level sensor (sub).
Check to see if the fuel level sensor is normal. Refer to GROUP
54A, Combination Meter − On-vehicle Service − Fuel Gauge Unit
Check
.
Q: Is the fuel level sensor (sub) normal?
YES : Go to Step 5.
NO : Replace the fuel level sensor (sub). Then go to Step
STEP 5. Check the trouble symptoms.
Check that the fuel gauge operates correctly.
Q: Does the fuel gauge operates correctly?
YES : It can be assumed that this malfunction is
intermittent. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points − How to
Cope with Intermittent Malfunctions
.
NO : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Codes Registration Judgment Table <Vehicles
or GROUP 42C, Diagnosis − ID
Codes Registration Judgment Table <Vehicles with
WCM>
. Then go to Step 6.
STEP 6. Check the trouble symptoms.
Check that the fuel gauge operates correctly.
Q: Does the fuel gauge operates correctly?
YES : The inspection is complete.
NO : Retry the troubleshooting.
DTC P2096: Post Catalyst Fuel Trim System too Lean
.
TECHNICAL DESCRIPTION
• The ECM effects air/fuel ratio feedback control in
accordance with the signals from the heated oxy-
gen sensor (front).
• If the heated oxygen sensor (front) has deterio-
rated, corrections will be made by the heated
oxygen sensor (rear).
.
DESCRIPTIONS OF MONITOR METHODS
• When an abnormality exists in the heated oxygen
sensor (front), the amount of compensated fuel
injection is abnormal. When this situation contin-
ues, it is judged to be faulty.
• If an abnormality exists in the heated oxygen sen-
sor (rear), also it is judged to be faulty even
though the heated oxygen sensor (front) is nor-
mal.
.
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)
• Heated oxygen sensor (front) monitor
• Heated oxygen sensor (rear) monitor
• Heated oxygen sensor (front) heater monitor
• Heated oxygen sensor (rear) heater monitor
• Heated oxygen sensor (front) inactive monitor
• Heated oxygen sensor offset voltage monitor
• Misfire monitor
• Fuel system monitor
• Air/fuel ratio feedback monitor
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-623
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
• Accelerator pedal position sensor
.
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is more than 76° C
(169° F).
• Under the closed loop air/fuel control.
• More than 90 seconds have passed since the
engine starting sequence was completed.
• Mass airflow sensor output is more than 5 g/sec.
End
Malfunction
No
No
No
D
LEAN
>= D
0
D
LEAN
: Fuel trim based on heated oxygen sensor (rear) <to lean>
D
LEAN
: Fuel trim based on heated oxygen sensor (rear) <to rich>
D
0
: Maximum Limit of D
LEAN
D
1
: Maximum Limit of D
RICH
D
RICH
>= D
1
Good
AK900364
No
Start
Yes
Yes
Yes
Yes
Continuous
failure for 5secs
Monitoring
conditions
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-624
Judgement Criterion
• The amount of compensated rich air/fuel ratio is
output by the heated oxygen sensor (rear). The
status that the amount of compensated rich
air/fuel ratio is greater than the specified amount
continues for 5 seconds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 1
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Heated oxygen sensor (front) failed.
• Heated oxygen sensor (rear) failed.
• Injector failed.
• ECM failed.
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 the diagnostic trouble code other than P2096 set?
YES : Refer to, Diagnostic Trouble Code Chart
NO : Go to Step 2.
STEP 2. Replace the heated oxygen sensor (front).
(1) Replace the heated oxygen sensor (front).
(2) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function − OBD-II Drive Cycle − Pattern 1
(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P2096 set?
YES : Go to Step 3.
NO : The inspection is complete.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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