Mitsubishi Galant (2004+). Manual — part 1355

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1113

142

EGR valve
(Stepper motor coil
<A1>)

Ignition switch: "LOCK(OFF)"

→ "ON"

5

− 8 V *

1

(changes about
three seconds
repeatedly)

136

EGR valve
(Stepper motor coil
<A2>)

130

EGR valve
(Stepper motor coil
<B1>)

124

EGR valve
(Stepper motor coil
<B2>)

149

Evaporative
emission purge
solenoid

Ignition switch: "ON"

B+

Engine: warm up, 3,000 r/min (within 3 minuting
sequence is completed)

Voltage drop

151

Ignition coil

− No. 1

(ignition power
transistor)

Engine: 3,000 r/min

0.3

− 3.0 V *

1

150

Ignition coil

− No. 2

(ignition power
transistor)

144

Ignition coil

− No. 3

(ignition power
transistor)

148

Ignition coil

− No. 4

(ignition power
transistor)

143

Ignition coil

− No. 5

(ignition power
transistor)

134

Ignition coil

− No. 6

(ignition power
transistor)

153

No. 1 injector

• Engine: warming up, idling

• Suddenly depress the accelerator pedal

From 9

− 13 V *

1

momentarily
drops slightly

146

No. 2 injector

140

No. 3 injector

139

No. 4 injector

133

No. 5 injector

127

No. 6 injector

TERMINAL NO. INSPECTION

ITEM

INSPECTION CONDITION (ENGINE
CONDITION)

NORMAL
CONDITION

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1114

TERMINAL RESISTANCE AND CONTINUITY CHECK

AK203310

4 3 2 1

7 6 5

9 8

11 10

14 13 12

18 17 16 15

25

21

24 23 22

29 28 27 26

34 33 32 31 30

38 37 36 35

43 42 41 40 39

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

104

96

94

95

93 92 91

99 98 97

103 102 101 100

108 107 106 105

113 112 111 110 109

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

PCM Harness Side Connector Terminal Arrangement

TERMINAL
NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION
CONDITION)

25

− Body

ground

PCM ground

Continuity (2

Ω or less)

29

− Body

ground

PCM ground

34

− Body

ground

PCM ground

38

− Body

ground

PCM ground

2

− 51

Evaporative emission ventilation solenoid

17

− 21 Ω [at 20°C (68°F)]

69

− 93

Engine coolant temperature sensor

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)]

69

− 107

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

− 0.45 kΩ [when intake air temperature is

80

°C (176°F)]

51

− 125

Left bank heated oxygen sensor heater
(front)

4.5

− 8.0 Ω [at 20°C (68°F)]

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1115

INSPECTION PROCEDURE USING AN
OSCILLOSCOPE

M1131154500651

CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR

Required Special Tools:

• MB991709: Test Harness

• MD998478: 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 connector, and

connect the test harness special tool (MD998478) between
the separated connector.

4. Connect the oscilloscope probe to crankshaft position

sensor connector terminal No. 2 (black clip of special tool).

51

− 126

Right bank heated oxygen sensor heater
(front)

4.5

− 8.0 Ω [at 20°C (68°F)]

51

− 137

Left bank heated oxygen sensor heater
(rear)

11

− 18 Ω [at 20°C (68°F)]

51

− 138

Right bank 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

51

− 133

No. 5 injector

51

− 127

No. 6 injector

TERMINAL
NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION
CONDITION)

AK102976AB

1 2 3

CAMSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

MB991709

AK102979AB

MD998478

1 2

3

CRANKSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1116

.

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