Mitsubishi Galant 9G. Manual — part 561

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-322

STEP 4. Using scan tool MB991958, check data list item 67:
Select Switch, item 68: Shift Switch (Up), item 69: Shift
Switch (Down).

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for

following items.

a. Item 67: Select Switch
b. Item 68: Shift Switch (Up)

c. Item 69: Shift Switch (Down)

NOTE: The switches above are displayed, depending on
the selector lever condition as shown in the table.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-14

.

NO : Replace the PCM.

STEP 5. Check the shift switch assembly.
Refer to

P.23A-384

, Transaxle Control.

Q: Is the switch operating properly?

YES : Go to Step 6.
NO : Replace the shift switch assembly. Refer to

P.23A-382

, Transaxle Control.

SELECTOR LEVER
OPERATION

DATA LIST ITEM

67

68

69

D range

OFF

OFF

OFF

Sport mode

ON

OFF

OFF

Upshift and hold the selector
lever

ON

ON

OFF

Downshift and hold the
selector lever

ON

OFF

ON

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-323

STEP 6. Measure the power supply voltage at shift switch
assembly connector C-20.
(1) Disconnect connector C-20 and measure at the harness

side.

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

(3) Measure the voltage between terminal 1 and ground.

• The voltage should measure 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 4.
NO : Go to Step 7.

STEP 7. Check joint connector (1) C-01 and shift switch
assembly connector C-20 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 8.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

AC306349AB

CONNECTOR: C-20

4

3

1

5 6

2

AC210372

2

6 5 4 3

1

AC

C-20 HARNESS
CONNECTOR:
COMPONENT SIDE

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

AC306349AB

CONNECTOR: C-20

4

3

1

5 6

2

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-324

STEP 8. Check the harness for open circuit or short circuit
to ground between joint connector (1) C-01 terminal 24 and
shift switch assembly connector C-20 terminal 1.
Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO : Repair or replace the harness wire.

STEP 9. Measure the power supply voltage at shift switch
assembly connector C-20.
(1) Disconnect connector C-20 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Move the selector lever to the "D" position.

(4) Measure the voltage between terminal 6 and ground.

• The voltage should measure battery positive voltage.

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

YES : Go to Step 12.
NO : Go to Step 10.

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

AC306349AB

CONNECTOR: C-20

4

3

1

5 6

2

AC306349AB

CONNECTOR: C-20

4

3

1

5 6

2

AC210375

2

6 5 4 3

1

AC

C-20 HARNESS
CONNECTOR:
COMPONENT SIDE

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-325

STEP 10. Check intermediate connector A-13 and shift
switch assembly connector C-20 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 11.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

STEP 11. Check harness for open circuit or short circuit to
ground between transmission range switch connector
B-110 terminal 1 and shift switch assembly connector C-20
terminal 6.
Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO : Repair or replace the harness wire.

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

AC306349AB

CONNECTOR: C-20

4

3

1

5 6

2

AC210068

CONNECTOR: B-110

B-110 (B)

AE

TRANSMISSION
RANGE SWITCH

1

7

2

8

3

5

9

4

10

6

AC306349AB

CONNECTOR: C-20

4

3

1

5 6

2