Mitsubishi Lancer Evolution X. Manual — part 379
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-581
Judgment Criterion
• For 0.76 second, the difference between the volu-
metric efficiency estimated by the throttle position
sensor (main) and the volumetric efficiency esti-
mated by the throttle position sensor (sub) is 8.8
percent or less.
.
FAIL-SAFE AND BACKUP FUNCTION
• Fuel control is carried out using throttle opening
degree and engine speed in accordance with pre-
set map.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Mass airflow sensor system 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 P1235 set?
YES : Refer to, Diagnostic Trouble Code Chart
NO : Go to Step 2.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-582
STEP 2. Using scan tool MB991958, check data list item 10:
Mass Airflow Sensor.
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item
10, Mass Airflow Sensor.
(3) Warm up the engine to normal operating temperature: 80° C
to 95° C (176° F to 203° F).
• The standard value during idling should be between
1,350 and 1,670 millivolts.
• When the engine is revved, the mass airflow rate should
increase according to the increase in engine speed.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 3.
NO : Refer to, DTC P0101 − Mass Airflow Circuit
Range/Performance Problem
, DTC P0102
− Mass Airflow Circuit Low Input
, DTC
P0103 − Mass Airflow Circuit High Input
.
STEP 3. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function − OBD-II Drive Cycle − Pattern 16
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P1235 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>
. Then go to Step 4.
NO : 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
.
STEP 4. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function − OBD-II Drive Cycle − Pattern 16
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P1235 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-583
DTC P1236: A/D Converter
.
TECHNICAL DESCRIPTION
Monitors whether input voltage from the accelerator
pedal position sensor (sub) is normally converted
into a digital signal in the ECM.
.
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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
DTC SET CONDITIONS
Check Condition
• Ignition switch is "ON" position.
Judgment Criterion
• When the input voltage from the accelerator
pedal position sensor (sub) is periodically 0 V for
0.45 second, the digital value of the input voltage
indicates 0.2 V or more.
.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
.
OBD-II DRIVE CYCLE PATTERN
• None.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• 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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-584
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 P1236 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 : 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
.
DTC P1237: Accelerator Pedal Position Sensor Plausibility
.
TECHNICAL DESCRIPTION
Compare the output value of the accelerator pedal
position sensor (main) with that of the accelerator
pedal position sensor (sub).
.
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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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