Mitsubishi Galant 9G. Manual — part 537

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-226

STEP 4. Measure the Overdrive solenoid valve resistance
at A/T control solenoid valve assembly connector B-108.
(1) Disconnect connector B-108 and measure at the solenoid

valve side.

(2) Measure the resistance between solenoid valve assembly

connector B-108 terminals 5 and 9.

Resistance value: 2.7

−3.4 Ω [at 20°C (68°F)]

Q: Is the measured resistance 2.7

−3.4 Ω [at 20°C (68°F)]?

YES : Go to Step 6.
NO : Go to Step 5.

STEP 5. Measure the solenoid valve resistance at the
overdrive solenoid valve assembly inside the transaxle.
(1) Disconnect connector B-108-3 and measure at the solenoid

valve side.

(2) Measure the resistance between Overdrive solenoid valve

terminals 1 and 2.

Resistance value: 2.7

−3.4 Ω [at 20°C (68°F)]

Q: Is the measured resistance 2.7

−3.4 Ω [at 20°C (68°F)?

YES : Replace the harness wire between A/T control

solenoid valve assembly connector B-108 and the
solenoid valves.

NO : Replace the Overdrive solenoid valve. Refer to

GROUP 23B, Valve Body

P.23B-80

.

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5

AC210692

2

7

1

8

3

9

4

6

10

5

AB

B-108 HARNESS CONNECTOR:
A/T CONTROL SOLENOID VALVE
ASSEMBLY SIDE

AC002219

CONNECTOR: B-108-3

BZ

B-108-3

VALVE BODY
ASSEMBLY

2

1

AC201141

B-180-3 HARNESS CONNECTOR:
OVERDRIVE
SOLENOID VALVE SIDE

BC

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-227

STEP 6. Check PCM connector B-21 and A/T control
solenoid valve assembly connector B-108 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 7.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

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

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-228

STEP 7. Check the harness for an open or short circuit to
ground between PCM connector B-20 terminal 55 and A/T
control solenoid valve assembly connector B-108 terminal
5.
Q: Is the harness wire in good condition?

YES : Replace the PCM.
NO : Repair or replace the harness wire.

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

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-229

STEP 8. Measure the supply voltage at A/T control
solenoid valve assembly connector B-108.
(1) Disconnect solenoid valve assembly harness connector

B-108.

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

(3) Measure the voltage between harness connector B-108

terminal 9 and ground.

• The voltage should equal battery positive voltage.

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

YES : Go to Step 11.
NO : Go to Step 9.

STEP 9. Check A/T control relay connector B-16X in the
engine component relay box and A/T control solenoid
valve assembly connector B-108 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 10.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5

AC210680

2

5

6

10

4

9

3

8

1

7

AB

B-108 HARNESS
CONNECTOR:
COMPONENT SIDE

AC306354

RELAY BOX

AB

CONNECTOR: B-16X

2

1

3

4

FRONT OF
VEHICLE

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5