Mitsubishi Outlander GS45X. Manual — part 984
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-869
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. 14.
(Check the 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
Observation condition
Function
Special pattern
Pattern height
Low
Pattern selector
Display
Engine r/min
Idle speed
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
AK700327AB
Power plant ECU
check harness connector
MB992110
AK700421
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) <3.0L ENGINE>
13B-870
Wave Pattern Observation Points
1. Check that cycle time becomes shorter when the engine
speed increased.
.
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.
AK700331
AB
Standard wave pattern
Crankshaft position
sensor output
wave pattern
Camshaft position
sensor output
wave pattern
2 Engine revolutions (1 camshaft revolution)
(Volt)
5
0
5
0
No. 1TDC
No. 2TDC
No. 3TDC
No. 4TDC
No. 5TDC
No. 6TDC
(Time)
TDC: Top dead center
AK700116
AK700117
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-871
INJECTOR
Required Special Tools:
• MB991658: Test Harness
• MB992110: Power Plant ECU Check Harness
.
Measurement Method
Measure at the right bank (number 1, 3, 5 cylinders)
1. Disconnect the intermediate connector B-21, and connect
the test harness special tool (MB991658) between the sep-
arated connector.
2. Connect the oscilloscope probe to each intermediate con-
nector B-21 terminal to analyze each cylinder:
• Terminal No. 7 for the number 1 cylinder
• Terminal No. 8 for the number 3 cylinder
• Terminal No. 9 for the number 5 cylinder
Measure at the left bank (number 2, 4, 6 cylinders)
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.
• Terminal No. 50 for the number 5 cylinder.
• Terminal No. 51 for the number 6 cylinder.
Standard Wave Pattern
Observation conditions
Function
Special pattern
Pattern height
Variable
Variable knob
Adjust while viewing the
wave pattern
Pattern selector
Display
Engine r/min
Idle speed
1
2 3
6
7 8
4 5
9 10
AK700328AB
Oscilloscope
MB991658
B-21 Intermediate
connector
AK700329
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
AK700327AB
Power plant ECU
check harness connector
MB992110
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-872
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.
EGR VALVE (STEPPER MOTOR)
Required Special Tools:
• MB991658: Test Harness
• MB992110: Power Plant ECU Check Harness
.
CONTRAST WITH
STANDARD WAVE
PATTERN
PROBABLE CAUSE
Injector coil induced voltage is
low or doesn't appear at all
Short in the injector solenoid
AK700332AB
(V)
50
0
Drive signal: "ON"
Point A
Point B:
Injector drive time
Drive signal: "OFF"
Power voltage
Injection coil induced
voltage (aproximately 50-60V)
Standard wave pattern
AK700118
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