Mitsubishi Galant (2004+). Manual - part 1067

CHECK AT THE POWERTRAIN CONTROL MODULE (PCM)

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1085

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)

INSPECTION PROCEDURE USING AN OSCILLOSCOPE

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1086

INSPECTION PROCEDURE USING AN OSCILLOSCOPE

M1131154500695

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.

.

Alternate method (Measure at the PCM)
1. Disconnect the all PCM connectors, and connect check 

harness special tool (MB991923) between the separated 
connectors.

AK102976AB

1 2 3

CAMSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

MB991709

AK302199

1 2 3

AB

MB991658

OSCILLOSCOPE

CRANKSHAFT POSITION
SENSOR INTERMEDIATE
CONNECTOR

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

INSPECTION PROCEDURE USING AN OSCILLOSCOPE

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1087

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

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.

Observation condition

Function

Special pattern

Pattern height

Low

Pattern selector

Display

Engine r/min

Idle speed

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

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

INSPECTION PROCEDURE USING AN OSCILLOSCOPE

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1088

Example 2
Cause of problem

• Loose timing belt.

• Abnormality in sensor disc.

Wave pattern characteristics

• Wave pattern is displaced to the left or right.

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.

AKX01602

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