Mitsubishi Galant (2004+). Manual - part 694

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-327

STEP 12. Check the shift switch assembly.

Refer to 

P.23A-388

, Transaxle Control.

Q: Is the switch operating properly?

YES : Go to Step 13.
NO :  Replace the shift switch assembly. Refer to 

P.23A-386

, Transaxle Control.

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-328

STEP 13. Measure the switch output voltage at PCM 
connector B-20 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.
(4) Move the selector lever to the sport mode.

AC306248AH

CONNECTOR: B-20

PCM

AIR
CLEANER

JAE

41

37

32

40

39

23

21 22

35

31

30

26

36

27

43

42

25

24

38

34

29

33

28

B-20

AC209793AK

SPECIAL TOOL 23-PIN CONNECTOR
WITHOUT RED TAPE
(PCM CONNECTOR B-20)

B-20 
(GR)

25

21

24 23 22

29 28 27 26

34 33 32 31 30

38 37 36 35

43 42 41 40 39

PCM

MB991923

BODY SIDE
HARNESS

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-329

(5) Measure the voltage between terminal 39 and ground.

• The voltage should measure battery positive voltage.

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

YES : Go to Step 16.
NO :  Go to Step 14.

STEP 14. Check PCM connector B-20 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 15.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC210376

24

33

37

42

43

25

34

38

29

40

41

39

21

30

22

23

27

36

32

28

31

35

26

JAE

AC

B-20 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AC306248AH

CONNECTOR: B-20

PCM

AIR
CLEANER

JAE

41

37

32

40

39

23

21 22

35

31

30

26

36

27

43

42

25

24

38

34

29

33

28

B-20

AC306349AB

CONNECTOR: C-20

4

3

1

5 6

2

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-330

STEP 15. Check the harness for open circuit or short 
circuit to ground between PCM connector B-20 terminal 39 
and shift switch assembly connector C-20 terminal 3.

Q: Is the harness wire in good condition?

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

AC306248AH

CONNECTOR: B-20

PCM

AIR
CLEANER

JAE

41

37

32

40

39

23

21 22

35

31

30

26

36

27

43

42

25

24

38

34

29

33

28

B-20

AC306349AB

CONNECTOR: C-20

4

3

1

5 6

2