Mitsubishi Galant (2004+). Manual - part 681

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-275

STEP 8. Check intermediate connector A-13, joint 
connector (1) C-01 and junction block connector C-214 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.

Q: Are the connectors in good condition?

YES : Go to Step 9.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC306223

A-13 (GR)

AB

CONNECTOR: A-13

1

4

7

8

2 3

5

13

14

17

15

12

16

11

10

9

6

AC305231

CONNECTOR: C-01

AS

33

22

11

28

17

16

15

14

13

12

25

2324

2627

3

1 2

4 5

21

20

19

18

29 30

32

31

7

6

8

10

9

AC207120

CONNECTOR: C-214

AU 

C-214

6

1

7

2

9

8

10

3

5

12

11

4

1314

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-276

STEP 9. Check the harness for open circuit or short circuit 
to ground between A/T control relay connector B-16X 
terminal 2 in the engine component relay box and junction 
block connector C-214 terminal 12.

Q: Is the harness wire in good condition?

YES : Go to Step 15.
NO :  Repair or replace the harness wire.

AC306354

RELAY BOX

AB

CONNECTOR: B-16X

2

1

3

4

FRONT OF
VEHICLE

AC207120

CONNECTOR: C-214

AU 

C-214

6

1

7

2

9

8

10

3

5

12

11

4

1314

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-277

STEP 10. Measure the A/T control relay output voltage at 
PCM connector B-21 by using check harness special tool 
MB991923.

(1) Disconnect all the connectors from the PCM.

(2) Connect special tool MB991923 (check harness) between 

the PCM and the body-side harness connector.

(3) Turn the ignition switch to the "ON" position.

AC306248AC

B-21 
(B)

CONNECTOR: B-21

PCM

AIR
CLEANER

73

80

54

67

60

71 72

77 78 79

64

51

59

58

65

52

66

53

75

74

76

81 82

83

63

JAE

62

68

61

55

69

56

70

57

AC209793AG

SPECIAL TOOL 33-PIN CONNECTOR
(PCM CONNECTOR B-21)

B-21
(GR)

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

PCM

MB991923

BODY SIDE
HARNESS

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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(4) Measure the voltage between terminal 57 and ground.

• The measured voltage should equal battery positive 

voltage.

(5) Measure the voltage between terminal 70 and ground.

• The measured voltage should equal battery positive 

voltage.

(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage equal to battery positive 

voltage between terminal 57 and ground, and between 
terminal 70 and ground?
YES : Go to Step 13.
NO :  Go to Step 11.

STEP 11. Check PCM connector B-21 for loose, corroded 
or damaged terminals, or terminals pushed back in the 
connector.

Q: Are the connector and terminals in good condition?

YES : Go to Step 12.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC210424

51

58

71

64

77

76

83

70

63

57

73 72

75 74

80

82 81

79 78

54

67

JAE

62

69

56

61

68

55

59

66

60

53

65

52

AC

B-21 HARNESS 
CONNECTOR:
COMPONENT SIDE

AC210423

51

58

71

64

77

76

83

70

63

57

73 72

75 74

80

82 81

79 78

54

67

JAE

62

69

56

61

68

55

59

66

60

53

65

52

AC

B-21 HARNESS 
CONNECTOR:
COMPONENT SIDE

AC306248AC

B-21 
(B)

CONNECTOR: B-21

PCM

AIR
CLEANER

73

80

54

67

60

71 72

77 78 79

64

51

59

58

65

52

66

53

75

74

76

81 82

83

63

JAE

62

68

61

55

69

56

70

57