Mitsubishi Galant (2004+). Manual - part 673

 

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Mitsubishi Galant (2004+). Manual - part 673

 

 

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.

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

.

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

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

.

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-246

LOGIC FLOW CHARTS (Monitor Sequence) <DTC 41 (P0731)>

.

DTC SET CONDITIONS <DTC 41 (P0731)>

Check Conditions

• Engine speed: 450 r/min or more.

• Output speed: 350 r/min or more.

• Shift stage: 1st gear.

• Input speed: more than 0 r/min.

• Transmission fluid temperature sensor voltage: 

4.5 volts or less.

• Voltage of battery: 10 volts or more.

Yes

No

No

N

E

 : 

Engine speed

START

Yes

No

Transmission fluid temperature 
sensor voltage < 4.5 V

There is only one transmission 
range switch signal

Yes

N

E

 > 450 r/min

N

OPG-B

 > 350 r/min

N

IPG-A

 > 0 r/min

Continuous failure for 4 secs.

Good

END

N

OPG-B 

: Output speed

            (output shaft speed sensor)

No

Yes

No

No

Yes

N

IPG-A

 < I

1

 × N

OPG-B

 - 200

No

Yes

Yes

Malfunction

Shift change is finished

N

IPG-A 

: Input speed

           (input shaft speed sensor)

I

1

 : 1st g

ear ratio

AC205243

Timer start

Timer > 2 secs.

Voltage of battery > 10 V

Shift stage commanded 
by A/T ECM is 1st

No

Yes

Yes

No

AB

Shift stage commanded 
        by PCM is 1st

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