Mitsubishi Galant 9G. Manual — part 568

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-350

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

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

Torque converter
clutch solenoid valve

• Engine: idling

• Gear range: 1st gear

Battery positive voltage

Overdrive solenoid
valve

• Engine: idling

• Gear range: 3rd gear

Battery positive voltage

• Engine: idling

• Transmission range: P

− 9 V

Low-reverse solenoid
valve

• Engine: idling

• Transmission range: P

Battery positive voltage

• Engine: idling

• Gear range: 2nd gear

− 9 V

Solenoid valve power
supply

Ignition switch: LOCK (OFF)

1V or less

Ignition switch: ON

Battery positive voltage

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

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

Underdrive solenoid
valve

• Engine: idling

• Gear range: 1st gear

Battery positive voltage

• Engine: idling

• Transmission range: P

− 9 V

Second solenoid valve

• Engine: idling

• Gear range: 2nd gear

Battery positive voltage

• Engine: idling

• Transmission range: P

− 9 V

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

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

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

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

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

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

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

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

24 23 22

29 28 27 26

34 33 32 31 30

38 37 36 35

43 42 41 40 39

54 53 52 51

62 61 60 59 58

69 68 67 66 65 64

75 74 73 72 71

82 81 80 79 78 77

104

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

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)

− 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

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

Underdrive solenoid
valve

Second solenoid valve

Overdrive solenoid
valve

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)

(ms)

AC001873AD

WAVEFORM B

(V)

(ms)

AC001875AF

WAVEFORM C

(V)

(ms)

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.

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.

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.

P.23A-356

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

P.23A-356

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

P.23A-357

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

P.23A-358

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

P.23A-359

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