Mitsubishi Montero Sport (2004+). Manual — part 362
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-861
TERMINAL RESISTANCE AND CONTINUITY CHECK
AKX01369
71
78
90
46
57
66
45
56
65
1
9
24
107
120
130
2
10
25
106
119
129
11
105
118
3
12
26
117
128
4
13
27
116
127
14
28
115
126
15
29
114
16
113
125
17
30
104
112
124
18
31
103
111
5
19
32
110
123
6
20
33
102
109
122
21
101
108
121
7
22
34
77
89
98
8
23
35
76
88
97
41
47
58
75
87
42
48
59
86
96
43
49
85
95
50
60
84
51
61
83
94
52
62
82
93
53
63
74
81
92
73
80
54
72
79
91
44
55
64
PCM Harness Side Connector Terminal Arrangement
AB
TERMINAL
NO.
INSPECTION ITEM
NORMAL CONDITION (INSPECTION
CONDITION)
1
− 41
No.1 injector
13
− 16 ohms [at 20° C (68° F)]
9
− 41
No.2 injector
24
− 41
No.3 injector
2
− 41
No.4 injector
10
− 41
No.5 injector
25
− 41
No.6 injector
3
− 41
Left bank heated oxygen sensor heater
(front)
4.5
− 8.0 ohms [at 20° C (68° F)]
4
− 41
Right bank heated oxygen sensor heater
(front)
4.5
− 8.0 ohms [at 20° C (68° F)]
6
− 41
EGR vacuum regulator solenoid valve
30
− 34 ohms [at 20° C (68° F)]
14
− 41
Stepper motor coil (A1)
28
− 33 ohms [at 20° C (68° F)]
28
− 41
Stepper motor coil (A2)
15
− 41
Stepper motor coil (B1)
29
− 41
Stepper motor coil (B2)
26
− 41
Left bank heated oxygen sensor heater
(rear)
11
− 18 ohms [at 20° C (68° F)]
27
− 41
Right bank heated oxygen sensor heater
(rear)
11
− 18 ohms [at 20° C (68° F)]
34
− 41
Evaporative emission purge solenoid
30
− 34 ohms [at 20° C (68° F)]
35
− 41
Evaporative emission ventilation solenoid
17
− 21 ohms [at 20° C (68° F)]
42
− Body
ground
PCM ground
Continuity (2 ohm or less)
48
− Body
ground
PCM ground
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-862
NOTE:
*:
indicates that resistance value should be 400 ohms or less.
44
− 57
Engine coolant temperature
14
− 17 kΩ [when engine coolant temperature
is -20
° C (-4° F)]
5.1
− 6.5 kΩ [when engine coolant temperature
is 0
° C (32° F)]
2.1
− 2.7 kΩ [when engine coolant temperature
is 20
° C (68° F)]
0.9
− 1.3 kΩ [when engine coolant temperature
is 40
° C (104° F)]
0.48
− 0.68 kΩ [when engine coolant
temperature is 60
° C (140° F)]
0.26
− 0.36 kΩ [when engine coolant
temperature is 80
° C (176° F)]
64
− 57
Intake air temperature sensor
13
− 17 kΩ [when intake air temperature is -20°
C (-4
° F)]
5.3
− 6.7 kΩ [when intake air temperature is 0°
C (32
° F)]
2.3
− 3.0 kΩ [when intake air temperature is 20°
C (68
° F)]
1.0
− 1.5 kΩ [when intake air temperature is 40°
C (104
° F)]
0.56
− 0.76 kΩ [when intake air temperature is
60
° C (140° F)]
0.30
− 0.42 kΩ [when intake air temperature is
80
° C (176° F)]
TERMINAL
NO.
INSPECTION ITEM
NORMAL CONDITION (INSPECTION
CONDITION)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-863
CHECK PROCEDURE WITH OSCILLOSCOPE
M1131154500628
VOLUME AIRFLOW SENSOR
Required Special Tool:
• MB991709: Test Harness Set
.
Measurement Method
1. Disconnect the volume airflow sensor connector, and
connect the test harness special tool (MB991709) in
between. (All terminals should be connected.)
2. Connect the oscilloscope probe to volume airflow sensor
connector terminal No. 3.
.
Alternate method (Test harness not available)
1. Connect the oscilloscope probe to PCM terminal No. 65.
Standard Wave Pattern
Observation conditions
Function
Special pattern
Pattern height
Low
Pattern selector
Display
Engine r/min
Idle speed
Observation conditions
Rev engine, observe T1 and T2 remain equal.
AK102975AC
1 2 3 4 5 6 7
VOLUME AIRFLOW
SENSOR CONNECTOR
OSCILLOSCOPE
MB991709
AKX01595
THE TIME (CYCLE TIME) T IS REDUCED WHEN THE
AMOUNT OF INTAKE AIR INCREASES.
TIMES T
1
AND T
2
ARE EQUAL
T
T
1
T
2
10
0
(V)
TIME
AB
Standard wave pattern
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-864
Wave Pattern Observation Points
1. Check that cycle time T becomes shorter and the frequency
increases when the engine speed is 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
• Damaged rectifier or vortex generation column.
Wave pattern characteristics
• Unstable wave pattern with non-uniform frequency.An
ignition leak will distort the wave pattern temporarily,
even if the volume airflow sensor is normal.
AKX01596
10
0
(V)
T
TIME
AB
Standard wave pattern
AKX01597
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