Mitsubishi Lancer Evolution X. Manual — part 438
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-817
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. Check harness connector B-15 at engine oil
pressure switch for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 5 .
STEP 2. Measure the power supply voltage at engine oil
pressure switch connector B-15.
(1) Disconnect the connector B-15 measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• The voltage should equal battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 3.
STEP 3. Check harness connector B-09 ECM connector for
damage.
Q: Is the connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 4. Check for open circuit and short circuit to ground
between ECM connector B-09 (terminal No. 36) and engine
oil pressure switch connector B-15 (terminal No. 1)
Q: Is the harness wire in good condition?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Code Registration Judgment Table <Vehicles with
or GROUP 42C, Diagnosis − ID
Codes Registration Judgment Table <Vehicles with
WCM>
. Then confirm that the malfunction
symptom is eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
1
AK700522AC
B-15 harness
connector:
component side
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-818
STEP 5. Check harness connector B-09 ECM connector for
damage.
Q: Is the connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 6. Check for harness damage between ECM
connector B-09 (terminal No. 36) and engine oil pressure
switch connector B-15 (terminal No. 1)
Q: Is the harness wire in good condition?
YES : Replace the engine oil pressure switch. Then confirm
that the malfunction symptom is eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
DATA LIST REFERENCE TABLE
M1131152004384
CAUTION
• When shifting the shift lever to D range, the brakes should be applied so that the vehicle does not
move forward.
• Driving tests always need two persons: one driver and one observer.
NOTE: *
1
: In a new vehicle [driven approximately 500 km (311 mile) or less], the mass airflow sensor output
value is sometimes 10 % higher than the standard value.
NOTE: *
2
: The injector drive time represents the time when the cranking speed is at 250 r/min or below when
the power supply voltage is 11 volts.
NOTE: *
3
: In a new vehicle [driven approximately 500 km (311 mile) or less], the injector drive time is some-
times 10 % longer than the standard time.
NOTE: *
4
: Vehicles for Canada, the headlight, taillight, etc. remain lit even when the lighting switch is in "OFF"
position but this is no problem for checks.
NOTE: *
5
: Data items are displayed on M.U.T.-III display, but the in-line 4 engine is not applicable and its data
is displayed as "N/A".
M.U.T.-III
SCAN
TOOL
DISPLAY
ITEM
NO.
INSPECTION
ITEM
INSPECTION REQUIREMENT
NORMAL
CONDITION
INSPECTION
PROCEDURE
NO.
REFERENCE
PAGE
A/C
compress
or relay
93
A/C
compressor
clutch relay
• Engine: warming up, idling
• A/C switch: "OFF"
OFF
Procedure
No. 27
• Engine:
warming
up, idling
• A/C switch:
"ON"
A/C
compressor
clutch is not
operating
OFF
A/C
compressor
clutch is
operating
ON
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-819
A/C SW
76
A/C switch
• Engine: warming up, idling
• A/C switch: "OFF"
OFF
Procedure
No. 27
• Engine:
warming
up, idling
• A/C switch:
"ON"
A/C
compressor
clutch is not
operating
OFF
A/C
compressor
clutch is
operating
ON
Absolute
load
value
72
Absolute load
value
Engine:
warming up
Engine is
idling
16 − 28 %
−
−
2,500 r/min
12 − 23 %
Revving
engine
Load value
increases
according to
amount of
revving.
Airflow
sensor
10
Mass airflow
sensor*
1
• Engine
coolant
temperatur
e: 80 −
95° C (176 −
203° F)
• Lights,
electric
cooling fan
and all
accessories
: "OFF"*
4
• Transaxle:
Neutral
(TC-SST:
"P" range)
Engine is
idling
1,300 − 1,650
mV
−
−
2,500 r/min
1,620 − 2,100
mV
Engine is
revved
Increases in
response to
revving
M.U.T.-III
SCAN
TOOL
DISPLAY
ITEM
NO.
INSPECTION
ITEM
INSPECTION REQUIREMENT
NORMAL
CONDITION
INSPECTION
PROCEDURE
NO.
REFERENCE
PAGE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-820
Airflow
sensor
AA
Mass airflow
sensor*
1
• Engine
coolant
temperatur
e: 80 −
95° C (176 −
203° F)
• Lights,
electric
cooling fan
and all
accessories
: "OFF"*
4
• Transaxle:
Neutral
(TC-SST:
"P" range)
Engine is
idling
1.8 − 4.4 g/s
−
−
2,500 r/min
8.0 − 12.0 g/s
Engine is
revved
Increases in
response to
revving
APP
sensor
(main)
11
Accelerator
pedal position
sensor (main)
Ignition switch:
"ON"
Release the
accelerator
pedal
900 − 1,100
mV
Code No.
P2122,
P2123
Depress the
accelerator
pedal
gradually
Increases in
response to
the pedal
depression
stroke
Depress the
accelerator
pedal fully
4,000 mV or
more
APP
sensor
(main)
BE
Accelerator
pedal position
sensor (main)
Ignition switch:
"ON"
Release the
accelerator
pedal
18 − 22 %
Code No.
P2122,
P2123
Depress the
accelerator
pedal
gradually
Increases in
response to
the pedal
depression
stroke
Depress the
accelerator
pedal fully
80 % or more
M.U.T.-III
SCAN
TOOL
DISPLAY
ITEM
NO.
INSPECTION
ITEM
INSPECTION REQUIREMENT
NORMAL
CONDITION
INSPECTION
PROCEDURE
NO.
REFERENCE
PAGE
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