Mitsubishi Grandis. Manual - part 859

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-103

STEP 3. Connectors check: C-121 shift switch 
assembly connector, C-112 engine-A/T-ECU 
connector, C-17 intermediate connector

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-104

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

STEP 4. MUT-III data list

• Item 67: Select switch

• Item 68: Upshift switch

• Item 69: Downshift switch

Check the above data list (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 : 

Replace the engine-A/T-ECU.

STEP 5. Check the shift switch assembly.

Refer to 

P.23A-145

.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Replace the shift switch assembly.

AC310613

BA

C-121

Connector: C-121
<LHD>

Harness side

AC310631AW

C-121

Harness side

Connector: C-121
<RHD>

AC311284

Connector: C-112 <LHD>

Connector: C-112 <RHD>

Harness side

Engine-A/T-ECU

C-112 (GR)

C-112 (GR)

Engine-A/T-ECU

AG

AC310615

AR

Connector: C-17
<LHD>

C-17

AC310628

Connector: C-17
<RHD>

AV

C-17

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-105

STEP 6. Connector check: C-121 shift switch 
assembly connector

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the defective connector.

STEP 7. Measure the voltage at shift switch 
assembly connector C-121
(1) Disconnect the connector, and measure the 

voltage between terminal 3 and earth at the 
wiring harness side.

(2) Ignition switch: ON

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 8.

AC310613

BA

C-121

Connector: C-121
<LHD>

Harness side

AC310631AW

C-121

Harness side

Connector: C-121
<RHD>

AC310613

BA

C-121

Connector: C-121
<LHD>

Harness side

AC310631AW

C-121

Harness side

Connector: C-121
<RHD>

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-106

STEP 8. Connectors check: C-203 J/B connector, 
C-33 J/C (7) <RHD>

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the defective connector.

STEP 9. Check the harness between shift switch 
assembly connector C-121 terminal No.3 and J/B 
connector C-203 terminal No.12.

Check the power supply line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

AC310623

Connectors: C-203 <LHD>

AL

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)

AC310618

Connectors: C-203 <RHD>

AK

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)

AC310631AV

C-33

Connector: C-33
<RHD>

2

1

3

13

12

14

21

10

5

4

6

16

15

17

7 8 9

19

18

20

11

22

AC310613

BA

C-121

Connector: C-121
<LHD>

Harness side

AC310631AW

C-121

Harness side

Connector: C-121
<RHD>

AC310623

Connectors: C-203 <LHD>

AL

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)

AC310618

Connectors: C-203 <RHD>

AK

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)