Mitsubishi Outlander GS45X. Manual — part 985
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-873
Measurement Method
1. Disconnect the EGR valve connector, and connect the test
harness special tool (MB991658) between the separated
connector (All terminals should be connected).
2. Connect the oscilloscope probe to the EGR valve connector
terminal No. 1, terminal No. 3, terminal No. 4, terminal No. 6
respectively.
.
Alternate method
1. Disconnect all ECM connectors. Connect the check harness
special tool (MB992110 between the separated connectors.
2. Connect the oscilloscope probe to check harness terminal
No. 31, No. 32, No. 47 and No. 48.
Standard Wave Pattern
AK700422
1
2 3
4
5 6
AB
EGR valve
connector
Oscilloscope
MB991658
Observation condition
Function
Special pattern
Pattern height
High
Pattern selector
Display
Engine condition
Revving
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
AK700423
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-874
Wave Pattern Observation Points
1. Check that the standard wave pattern appears when the
EGR valve is operating.
Point A: Presence or absence of induced electromotive force
from the motor turning. (Refer to abnormal wave pattern.)
Point B: Height of coil back electromotive force
.
CONTRAST WITH
STANDARD WAVE
PATTERN
PROBABLE CAUSE
Induced electromotive force
does not appear or is
extremely small
Malfunction of motor
CONTRAST WITH
STANDARD WAVE
PATTERN
PROBABLE CAUSE
Coil reverse electromotive
force does not appear or is
extremely small
Short in the coil
AK700333AB
(V)
30
20
10
0
EGR valve
(stepper moter)
control signal
wave pattern
Point B coil reverse
electromotive force
(approximately 3 ×10V) Point an induced
electromotive force
from the moter turning
Time
Standard wave pattern
The wave pattern
appears for an
instant, but soon
disappears.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-875
Examples of Abnormal Wave Patterns
Example 1
Cause of problem
• Malfunction of motor. (Motor is not operating.)
Wave pattern characteristics
• Induced electromotive force from the motor turning does
not appear.
Example 2
Cause of problem
• Open circuit in the line between the EGR valve and the
ECM.
Wave pattern characteristics
• Current is not supplied to the motor coil on the open cir-
cuit side. (Voltage does not drop to 0 volt.) Furthermore,
the induced electromotive force wave pattern at the nor-
mal side is slightly different from the normal wave pat-
tern.
IGNITION COIL AND IGNITION POWER
TRANSISTOR
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. 2 for the number 1 cylinder.
• Terminal No. 3 for the number 3 cylinder.
• Terminal No. 4 for the number 5 cylinder.
Measure at the left bank (number 2, 4, 6 cylinders)
1. Disconnect the ignition coil connector, and connect test har-
ness special tool (MB991658) between the separated con-
nector. (All terminals should be connected.)
2. Connect the oscilloscope probe to ignition coil connector
terminal No. 2.
.
AK700119 AB
AK700120
Open
circuit
side
Normal
side
AB
1
2 3
6
7 8
4 5
9 10
AK700328AB
Oscilloscope
MB991658
B-21 Intermediate
connector
AK700330
2 3
1
AB
Ignition coil
connector
Oscilloscope
MB991658
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-876
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. 4 for the number 1 cylinder.
• Terminal No. 5 for the number 2 cylinder.
• Terminal No. 20 for the number 3 cylinder.
• Terminal No. 21 for the number 4 cylinder.
• Terminal No. 52 for the number 5 cylinder.
• Terminal No. 53 for the number 6 cylinder.
Standard Wave Pattern
Wave Pattern Observation Points
Point: The power transistor control signal (ignition timing) is
advanced when the engine speed is increased.
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
AK700334
AB
TDC
5˚BTDC
ON
Time
OFF
Ignition power
transistor
control signal
wave pattern
Standard wave pattern
Ignition
timing
Dwell
section
5
10
0
0
2 Engine revolution (1 camshaft revolution)
(Volt)
Crankshaft position
sensor output
wave pattern
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