Mitsubishi Grandis. Manual - part 846

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-51

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the defective connector.

STEP 11. Check the harness between stop lamp 
switch connector C-127 terminal No.1 and 
engine-A/T-ECU connector C-111 terminal No.39.

Check the output line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

STEP 12. Connector check: C-125 intermediate 
connector

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 13.

NO : 

Repair the defective connector.

STEP 13. Check the harness between stop lamp 
switch connector C-127 terminal No.2 and 
battery.

Check the power supply line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

AC309520AD

Connector: C-127

Harness side

Brake pedal

4

3

2

1

AC311284AH

Connector: C-111 <LHD>

Connector: C-111 <RHD>

Harness side

Engine-A/T-ECU

C-111 (GR)

C-111 (GR)

45

52

35

42 41

43
51

58

50

57

33

34

36

403938 37

47

55

48

56

44

49

46

54

3231

53

Engine-A/T-ECU

AC310613

AZ

Connector: C-125 <LHD>

C-125

38

1213

11

26

14

1

20

6

232425

37

31

36

30

10

9

2122

35

8

7

34

17

29

1819

5

4

1516

33

28

32

27

3

2

AC310628

Connector: C-125 <RHD>

C-125

AU

38

1213

11

26

14

1

20

6

232425

37

31

36

30

10

9

2122

35

8

7

34

17

29

1819

5

4

1516

33

28

32

27

3

2

AC309520AD

Connector: C-127

Harness side

Brake pedal

4

3

2

1

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-52

Code No.27: Inhibitor switch system

ENGINE-
A/T-ECU

INHIBITOR
SWITCH

SELECT
SWITCH

SHIFT
SWITCH

SHIFT 
SWITCH 
ASSEMBLY

IGNITION
SWITCH(IG1)

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet   

Inhibitor switch system circuit <LHD>

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-53

OPERATION

The inhibitor switch detects the selector lever 
position (P, R, N or D) which the driver has selected, 
and sends the information to the engine-A/T-ECU.

DIAGNOSIS CODE SET CONDITIONS

If the inhibitor switch has not been sending any 
signal for at least 30 seconds, an open circuit may be 
present and dianosis code No.27 will be set.

AC312596AB

ENGINE-
A/T-ECU

INHIBITOR
SWITCH

SELECT
SWITCH

SHIFT
SWITCH

SHIFT 
SWITCH 
ASSEMBLY

IGNITION
SWITCH(IG1)

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet   

Inhibitor switch system circuit <RHD>

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-54

POSSIBLE CAUSES

• Malfunction of the inhibitor switch

• Damaged harness wires and connectors

• Malfunction of the engine-A/T-ECU

DIAGNOSIS

STEP 1. MUT-III data list

Item 61: Inhibitor switch  (Refer to data list reference 
table 

P.23A-117

).

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction 

P.00-5

).

NO <none of the selector lever positions are 
displayed on MUT-III> : 

Go to Step 2.

NO <only one of the selector lever positions is not 
displayed on MUT-III> : 

Go to Step 6.

STEP 2. Check the inhibitor switch.

Refer to 

P.23A-128

.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the inhibitor switch.