Mitsubishi Galant 9G. Manual — part 541

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-242

STEP 11. 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 12.
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-243

STEP 12. Check the harness for an open or short circuit to
ground between PCM connector B-21 (terminals 54 and 56)
and A/T control solenoid valve assembly connector B-108
(terminals 6 and 7).
Q: Are the harness wires in good condition?

YES : Go to Step 13.
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-244

STEP 13. Check the harness for an open or short circuit to
ground between A/T control solenoid valve assembly
connector B-108 (terminals 6, 7, and 10) and solenoid
valve connectors B-108-4 and B-108-5.
Q: Is the harness wire in good condition?

YES : Replace the PCM.
NO : Replace the harness wire.

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5

AC002219

CONNECTORS: B-108-4, B-108-5

CC

B-108-4

B-108-5

VALVE BODY
ASSEMBLY

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-245

DTC 41 (P0731): 1st Gear Incorrect Ratio
DTC 42 (P0732): 2nd Gear Incorrect Ratio
DTC 43 (P0733): 3rd Gear Incorrect Ratio
DTC 44 (P0734): 4th Gear Incorrect Ratio
DTC 46 (P0736): Reverse Gear Incorrect Ratio

.

CIRCUIT OPERATION

• The input shaft speed sensor generates a pulsed

signal of 0

⇔ 5 volts. The pulsed signal fre-

quency increases with an increase in the input
shaft speed.

• The PCM continuously monitors the input shaft

speed signal.

• The output shaft speed sensor generates a

pulsed signal of 0

⇔ 5 volts. The pulsed signal

frequency increases with an increase in the out-
put shaft speed.

• The PCM continuously monitors the output shaft

speed signal.

.

DESCRIPTIONS OF MONITOR METHODS
<DTC 41 (P0731)>

• In 1st gear, if a difference between turbine revolu-

tion and that value calculated from output revolu-
tion equals or exceeds specified value, PCM
judges that step-out in 1st gear has occurred.

.

MONITOR EXECUTION <DTC 41 (P0731)>

• Continuous

.

MONITOR EXECUTION CONDITIONS
(OTHER MONITOR AND SENSOR) <DTC
41 (P0731)>

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• DTC 27, 28 (P0705): Transmission range switch

malfunction

• DTC 22 (P0715): Input shaft speed sensor mal-

function

• DTC 23 (P0720): Output shaft speed sensor mal-

function

• DTC 36 (P0743): Torque converter clutch sole-

noid malfunction

• DTC 31 (P0753): Low-reverse solenoid malfunc-

tion

• DTC 32 (P0758): Underdrive solenoid malfunc-

tion

• DTC 33 (P0763): Second solenoid malfunction

• DTC 34 (P0768): Overdrive solenoid malfunction

• DTC 54 (P1751): A/T control relay malfunction

Sensor (The sensor below is determined to be

normal)

• Input shaft speed sensor

• Output shaft speed sensor

• Transmission range switch

• Torque converter clutch solenoid

• Low-reverse solenoid

• Underdrive solenoid

• Second solenoid

• Overdrive solenoid

• A/T control relay

.