Mitsubishi Lancer Evolution X. Manual — part 313
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-317
STEP 18. Check for open circuit and short circuit to
ground and harness damage between No. 2 cylinder
injector connector B-102 (terminal No. 2) and ECM
connector B-09 (terminal No. 3).
Q: Is the harness wire in good condition?
YES : Go to Step 19.
NO : Repair it. Then go to Step 20.
STEP 19. Using the oscilloscope, check the No. 2 cylinder
injector.
(1) Disconnect the No. 2 cylinder injector connector B-102 and
connect the test harness special tool MB991658 between
the separated connectors. (All terminals should be
connected.)
(2) Connect the oscilloscope probe to the injector side
connector terminal No. 2.
NOTE: When measuring with the ECM side connector, dis-
connect all ECM connectors. Connect the check harness
special tool (MB992110) between the separated connec-
tors. Then connect the oscilloscope probe to the check har-
ness connector terminal No. 3.
(3) Start the engine and run at idle.
(4) Measure the waveform.
• The waveform should show a normal pattern similar to
the illustration.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?
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, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
STEP 20. 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 23
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0202 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK604471
1 2
AB
Injector
connector
MB991658
Oscilloscope
AK604546 AB
A
Normal waveform
A:Injector drivetime
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-318
DTC P0203: Injector Circuit-Cylinder 3
AK704262
1
3
2
4
1
2
3
4
1
2
3 4 5 6 7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
2
1
1 2 3
4 5 6
1
12 13 14 15 16 1718 19 20 2122 2324
2 3 4 5
6 7 8 9 10 11
1 2 3 4
5 6 7
15
14
13
12
11
9
8
10
1
6
4
5
9
8
10 11
13
15
14
12
16
7
2 3
INJECTOR
NO. 3
B-103
(MU802062)
A-39
MU802607
1
2
18
INJECTOR CIRCUIT-CYLINDER 3
RED-BLA
CK
RED-
BLA
CK
GREEN-RED
B-09
AC
20A
WHITE
WHITE
A-34X
MFI
RELAY
4
3
1
2
22
36
FUSIBLE LINK
OFF
ON
WHITE
WHITE
RED-
GREEN
RED-
GREEN
4
1
14
10
15
6
7
C-304
C-317
J-C (7)
C-50
A-21X
3
2
IGNITION
SWITCH (IG1)
ETACS-
ECU
INJECTOR
RELAY
OFF
ON
RELAY BOX
(ENGINE COMPARTMENT)
ENGINE CONTROL MODULE
TO ECM
BLA
CK
BLA
CK
BLA
CK
BLA
CK
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-319
.
CIRCUIT OPERATION
• The injector power is supplied from the injector
relay (terminal No. 3).
• The ECM controls the injector by turning the
power transistor in the ECM "ON" and "OFF".
.
TECHNICAL DESCRIPTION
• The amount of fuel injected by the injector is con-
trolled by the amount of continuity time the coil is
grounded by the ECM.
.
DESCRIPTIONS OF MONITOR METHODS
The ECM detects open circuit and short malfunction.
.
MONITOR EXECUTION
Continuous
.
AK704256
Connectors: A-25X, A-34X
MFI relay
Injector relay
A-34X
A-25X
AB
AK704255AB
Connector: A-39
A-39 (B)
AK704227
Connector: B-09
ECM
B-09 (GR)
AB
AK704265 AB
Connector: B-103
B-103 (GR)
Injector No. 3
AK704258 AB
Connector: C-50
C-50 (B)
AK704259AB
Connectors: C-304, C-317
ETACS-ECU
C-304
C-317
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-320
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 <Circuit continuity − open circuit and shorted low>
Logic Flow Chart
Check Condition
• Engine is running.
Judgement Criterion
• The supply voltage is 3 volts or less without the
injector driving for 2 seconds.
.
Good
Malfunction
Injector voltage < = 3V
Start
Continuous
failure for 2secs
End
No
No
Yes
Yes
Yes
No
AK700479
Monitoring
condition
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