Mitsubishi Galant 9G. Manual — part 916
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1106
INSPECTION PROCEDURE USING AN
OSCILLOSCOPE
M1131154501074
CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR
Required Special Tools:
• MB991709: Test Harness
• MB991658: Test Harness
• MB991923: Power Plant ECU Check Harness
.
Measurement Method
1. Disconnect the camshaft position sensor connector, and
connect the test harness special tool (MB991709) between
the separated connector (All terminals should be
connected).
2. Connect the oscilloscope probe to camshaft position sensor
connector terminal No. 2.
3. Disconnect the crankshaft position sensor intermediate
connector, and connect the test harness special tool
(MB991658) between the separated connector.
4. Connect the oscilloscope probe to crankshaft position
sensor intermediate connector terminal No. 2.
.
51
− 126
Cylinder 1, 4 heated oxygen sensor heater
(front)
4.5
− 8.0 Ω [at 20°C (68°F)]
51
− 128
Engine oil control valve
6.9
− 7.9 Ω [at 20°C (68°F)]
51
− 137
Cylinder 2, 3 heated oxygen sensor heater
(rear)
11
− 18 Ω [at 20°C (68°F)]
51
− 138
Cylinder 1, 4 heated oxygen sensor heater
(rear)
11
− 18 Ω [at 20°C (68°F)]
141
− 147
Throttle actuator control motor
0.3
− 80 Ω [at 20°C (68°F)]
51
− 142
Stepper motor coil (A1)
20
− 24 Ω [at 20°C (68°F)]
51
− 136
Stepper motor coil (A2)
51
− 130
Stepper motor coil (B1)
51
− 124
Stepper motor coil (B2)
51
− 149
Evaporative emission purge solenoid
30
− 34 Ω [at 20°C (68°F)]
51
− 153
No. 1 injector
10.5
− 13.5 Ω [at 20°C (68°F)]
51
− 146
No. 2 injector
51
− 140
No. 3 injector
51
− 139
No. 4 injector
TERMINAL
NO.
INSPECTION ITEM
NORMAL CONDITION (INSPECTION
CONDITION)
AK102976AB
1 2 3
CAMSHAFT POSITION
SENSOR CONNECTOR
OSCILLOSCOPE
MB991709
AK302199
1 2 3
AB
MB991658
OSCILLOSCOPE
CRANKSHAFT POSITION
SENSOR INTERMEDIATE
CONNECTOR
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1107
Alternate method (Measure at the PCM)
1. Disconnect the all PCM connectors, and connect check
harness special tool (MB991923) between the separated
connectors.
2. Connect the oscilloscope to check harness terminal No.
104. (Check the camshaft position sensor signal wave
pattern.)
3. Connect the oscilloscope to check harness terminal No.
103. (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
AK202956
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
AB
POWER PLANT ECU
CHECK HARNESS CONNECTOR
MB991923
PCM
AK203302
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
AB
OSCILLOSCOPE
POWER PLANT ECU
CHECK HARNESS
CONNECTOR
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1108
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.
AK304079
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. 3TDC
No. 4TDC
No. 2TDC
(TIME)
TDC: TOP DEAD CENTER
AKX01597
AKX01602
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1109
INJECTOR
Required Special Tools:
• MB991658: Test Harness
• MB991923: 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 (Measure at the PCM)
1. Disconnect the all PCM connectors, and connect check har-
ness special tool (MB991923) between the separated con-
nectors.
2. Connect the oscilloscope probe to each check harness con-
nector terminal to analyze each cylinder:
• Terminal No. 153 for the number 1 cylinder.
• Terminal No. 146 for the number 2 cylinder.
• Terminal No. 140 for the number 3 cylinder.
• Terminal No. 139 for the number 4 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
AK302166
1 2
INJECTOR
CONNECTOR
MB991658
OSCILLOSCOPE
AB
AK202954
127 126 125 124 123 122 121
133 132 131 130 129 128
140 139 138 137 136 135 134
146 145 144 143 142 141
153 152 151 150 149 148 147
AB
POWER PLANT ECU
CHECK HARNESS CONNECTOR
MB991923
PCM
127 126 125 124 123 122 121
133 132 131 130 129 128
140 139 138 137 136 135 134
146 145 144 143 142 141
153 152 151 150 149 148 147
AK303940AB
OSCILLOSCOPE
POWER PLANT ECU
CHECK HARNESS
CONNECTOR
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