Mitsubishi Lancer Evolution X. Manual — part 447
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-853
Alternate method
1. Disconnect all ECM connectors. Connect the check harness
special tool (MB992110) between the separated connectors.
2. Connect the oscilloscope to check harness terminal No. 7.
(Check the exhaust camshaft position sensor signal wave
pattern.)
3. Connect the oscilloscope to check harness terminal No. 8.
(Check the crankshaft position sensor signal wave pattern.)
Standard Wave Pattern
16 15 14 13 12 11 10 9 8 7 6 5 4 3
2
1
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
AK604467AB
Power plant ECU
check harness connector
MB992110
AK704384
16 15 14 13 12 11 10 9 8 7 6 5 4 3
2
1
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
Oscilloscope
Power plant ECU
check harness
connector
AB
Observation condition
Function
Special pattern
Pattern height
Low
Pattern selector
Display
Engine r/min
Idle speed
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-854
Wave Pattern Observation Points
• Verify that, toward the engine speed of 2,500 r/min, time dif-
ference T from when the crankshaft position sensor output
wave falls to when the exhaust camshaft position sensor
output wave falls becomes less.
.
Examples of Abnormal Wave Patterns
Example 1
Cause of problem
• Sensor interface malfunction.
Wave pattern characteristics
• Rectangular wave pattern is output even when the
engine is not started.
Example 2
Cause of problem
• Loose timing belt.
• Abnormality in sensor disc.
Wave pattern characteristics
• Wave pattern is displaced to the left or right.
AK703482
(at advance angle) (at retard angle)
T
AE
(Volt)
5
0
5
0
(ms)
Phase angle
2 engine revolutions (1 camshaft revolution)
Standard wave pattern
Crankshaft position
sensor output wave
pattern
Exhaust camshaft
position sensor
output wave pattern
AK604469 AB
AK604470
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-855
INJECTOR
Required Special Tools:
• MB991658: Test Harness
• MB992110: Power Plant ECU Check Harness
.
Measurement Method
1. Disconnect the injector connector, and connect the test har-
ness special tool (MB991658) between the separated con-
nector. (All terminals should be connected.)
2. Connect the oscilloscope probe to injector connector termi-
nal No. 2.
Alternate method
1. Disconnect all ECM connectors. Connect the check har-
ness special tool (MB992110) between the separated con-
nectors.
2. Connect the oscilloscope probe to each check harness con-
nector terminal to analyze each cylinder:
• Terminal No. 2 for the number 1 cylinder.
• Terminal No. 3 for the number 2 cylinder.
• Terminal No. 18 for the number 3 cylinder.
• Terminal No. 19 for the number 4 cylinder.
AK604471
1 2
AB
Injector
connector
MB991658
Oscilloscope
16 15 14 13 12 11 10 9 8 7 6 5 4 3
2
1
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
AK604467AB
Power plant ECU
check harness connector
MB992110
AK704386
16 15 14 13 12 11 10 9 8 7 6 5 4 3
2
1
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
AB
Oscilloscope
Power plant ECU
check harness
connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-856
Standard Wave Pattern
Wave Pattern Observation Points
Point A: Height of injector coil induced voltage.
Point B: Injector drive time
1. The injector drive time should be synchronized with the
scan tool tester display.
2. When the engine is suddenly revved, the drive time will be
greatly extended at first, but the drive time will soon return
to original length.
Observation conditions
Function
Special pattern
Pattern height
Variable
Variable knob
Adjust while viewing the
wave pattern
Pattern selector
Display
Engine r/min
Idle speed
CONTRAST WITH
STANDARD WAVE
PATTERN
PROBABLE CAUSE
Injector coil induced voltage is
low or doesn't appear at all
Short in the injector solenoid
AK703483
(Volt)
50
0
Standard wave pattern
Time
AD
Point A
Power voltage
Drive signal: ON
Drive signal: OFF
Solenoid back
electromotive force
Point B
Injector drive time
AK604472AB
When idling
When racing
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