Mitsubishi Galant 9G. Manual - part 568

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-350

36

Shift switch (down) 
<Vehicles with sport 
mode>

• Ignition switch: ON

• Selector lever operation: Downshift 

and hold the selector lever

Battery positive voltage

• Ignition switch: ON

• Selector lever operation: Other than 

above

1 V or less

39

Select switch 
<Vehicles with sport 
mode>

• Ignition switch: ON

• Transmission range: Sport mode

Battery positive voltage

• Ignition switch: ON

• Transmission range: Other than above

1 V or less

54

Torque converter 
clutch solenoid valve

• Engine: idling

• Gear range: 1st gear

Battery positive voltage

55

Overdrive solenoid 
valve

• Engine: idling

• Gear range: 3rd gear

Battery positive voltage

• Engine: idling

• Transmission range: P

6 

− 9 V

56

Low-reverse solenoid 
valve

• Engine: idling

• Transmission range: P

Battery positive voltage

• Engine: idling

• Gear range: 2nd gear

6 

− 9 V

57

Solenoid valve power 
supply

Ignition switch: LOCK (OFF)

1V or less

Ignition switch: ON

Battery positive voltage

61

Transmission range 
switch: R

• Ignition switch: ON

• Transmission range: R

Battery positive voltage

• Ignition switch: ON

• Transmission range: Other than above

1 V or less

62

Transmission range 
switch: 3 <Vehicles 
without sport mode>

• Ignition switch: ON

• Transmission range: 3

Battery positive voltage

• Ignition switch: ON

• Transmission range: Other than above

1 V or less

65

Underdrive solenoid 
valve

• Engine: idling

• Gear range: 1st gear

Battery positive voltage

• Engine: idling

• Transmission range: P

6 

− 9 V

66

Second solenoid valve

• Engine: idling

• Gear range: 2nd gear

Battery positive voltage

• Engine: idling

• Transmission range: P

6 

− 9 V

67

Transmission range 
switch: P

• Ignition switch: ON

• Transmission range: P

Battery positive voltage

• Ignition switch: ON

• Transmission range: Other than above

1 V or less

70

Solenoid valve power 
supply

Ignition switch: LOCK (OFF)

1 V or less

Ignition switch: ON

Battery positive voltage

TERMINAL 
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-351

72

Transmission range 
switch: L <Vehicles 
without sport mode>

• Ignition switch: ON

• Transmission range: L

Battery positive voltage

• Ignition switch: ON

• Transmission range: Other than above

1 V or less

73

Transmission range 
switch: D

• Ignition switch: ON

• Transmission range: D

Battery positive voltage

• Ignition switch: ON

• Transmission range: Other than above

1 V or less

74

Transmission fluid 
temperature sensor

• Ignition switch: ON

• Transmission fluid temperature: 20°C 

(68

°F)

3.8 

− 4.0 V

• Ignition switch: ON

• Transmission fluid temperature: 40°C 

(104

°F)

3.2 

− 3.4 V

• Ignition switch: ON

• Transmission fluid temperature: 80°C 

(176

°F)

1.7 

− 1.9 V

75

Transmission range 
switch: 2 <Vehicles 
without sport mode>

• Ignition switch: ON

• Transmission range: 2

Battery positive voltage

• Ignition switch: ON

• Transmission range: Other than above

1 V or less

77

Transmission range 
switch: N

• Ignition switch: ON

• Transmission range: N

Battery positive voltage

• Ignition switch: ON

• Transmission range: Other than above

1 V or less

82

A/T control relay

Always

1 V or less

111

Input shaft speed 
sensor

• Measure between terminal 111 and 4 

with an oscilloscope.

• Engine: 2,000 r/min

• Gear range: 3rd gear

Refer to 

P.23A-352

, 

Inspection Procedure 
Using an Oscilloscope.

112

Output shaft speed 
sensor

• Measure between terminal 112 and 4 

with an oscilloscope.

• Engine: 2,000 r/min

• Gear range: 3rd gear

Refer to 

P.23A-352

, 

Inspection Procedure 
Using an Oscilloscope.

TERMINAL 
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-352

PCM  TERMINAL RESISTANCE  AND CONTINUITY INSPECTION CHART

M1231013400204

NOTE: The PCM connectors should be discon-
nected for this inspection.

INSPECTION PROCEDURE USING AN OSCILLOSCOPE

M1231008500313

AC209259

4 3 2 1

7 6 5

8 9

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

AD

33-PIN
CONNECTOR
(PCM CONNECTOR
B-23)

23-PIN
CONNECTOR
WITH RED TAPE
(PCM CONNECTOR
B-22)

33-PIN
CONNECTOR
(PCM CONNECTOR
B-21)

23-PIN
CONNECTOR
WITHOUT RED TAPE
(PCM CONNECTOR
B-20)

18-PIN
CONNECTOR
(PCM CONNECTOR
B-19)

TERMINAL NO.

INSPECTION ITEM

NORMAL CONDITION (CHECK CONDITION)

69 

− 74

Transmission fluid temperature 
sensor

16.7 

− 20.5 kΩ [at 0°C (32°F)]

7.3 

− 8.9 kΩ [at 20°C (68°F)]

3.4 

− 4.2 kΩ [at 40°C (104°F)]

1.9 

− 2.2 kΩ [at 60°C (140°F)]

1.0 

− 1.2 kΩ [at 80°C (176°F)]

0.57 

− 0.69 kΩ [at 100°C (212°F)]

TERMINAL 
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL 
CONDITION 
(WAVEFORM 
SAMPLE)

103

Crankshaft position 
sensor

Transmission range: N

Idling (Vehicle stopped)

Waveform A

111

Input shaft speed 
sensor

Gear range: 3rd gear

Driving at constant 
speed of 50 km/h (31 
mph) in 3rd gear ( 1,400 
− 1,700 r/min)

Waveform B

112

Output shaft speed 
sensor

56

Low-reverse solenoid 
valve

• Ignition switch: ON

• Transmission range: P

• Engine: Stopped

• Throttle (Accelerator) 

opening voltage: 1 V or 
less

Force drive each 
solenoid valve (Actuator 
test)

Waveform C

65

Underdrive solenoid 
valve

66

Second solenoid valve

55

Overdrive solenoid 
valve

54

Torque converter 
clutch control solenoid

A/T FAULTY OPERATION PREVENTION MECHANISM DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-353

Waveform sample

A/T FAULTY OPERATION PREVENTION MECHANISM 

DIAGNOSIS

INTRODUCTION TO A/T KEY INTERLOCK AND SHIFT LOCK MECHANISMS

M1232001600226

If the key interlock and shift lock mechanisms indi-
cates a malfunction, the key interlock cable, the shift 
lock cable, or the selector lever assembly may be 
defective. In this case, follow troubleshooting below.

A/T KEY INTERLOCK AND SHIFT LOCK MECHANISMS DIAGNOSTIC 
TROUBLESHOOTING STRATEGY

M1232001700223

Use these steps to plan your diagnostic strategy. If 
your follow then carefully, you will be sure that you 
have exhausted most of the possible ways to find 
automatic transaxle key interlock and shift lock 
mechanisms fault.
1. Gather information from the customer.

2. Verify that the condition described by the 

customer exists.

3. Find the malfunction by following the Symptom 

Chart.

4. Verify malfunction is eliminated.

SYMPTOM CHART

M1232001800413

AC001872AE

WAVEFORM A

(V)

0

5

(ms)

AC001873AD

WAVEFORM B

(V)

0

5

(ms)

AC001875AF

WAVEFORM C

(V)

0

20

(ms)

40

60

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

Selector lever can be moved from "P" to "R" position without depressing 
brake pedal when ignition key is at any position other than "LOCK" (OFF) 
position.

1

 

P.23A-354

Selector lever cannot be moved from "P" to "R" position with brake pedal 
depressed when ignition key is at any position other than "LOCK" (OFF) 
position.

2

 

P.23A-354

Selector lever can be moved from "P" to "R" position with brake pedal 
depressed when ignition key is at "LOCK" (OFF) position.

3

 

P.23A-356

Selector lever cannot be moved from "P" to "R" position smoothly.

4

 

P.23A-356

Selector lever cannot be moved from "P" to "R" position.

5

 

P.23A-357

Ignition key cannot be turned to "LOCK" (OFF) position when selector 
lever is at "P" position.

6

 

P.23A-358

Ignition key can be turned to "LOCK" (OFF) position when selector lever 
is at any position other than "P" position.

7

 

P.23A-359