Mitsubishi Grandis. Manual - part 844

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-43

STEP 11. Check the harness between output 
shaft speed sensor connector B-108 terminal 
No.3 and junction block 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 6.

NO : 

Repair the wiring harness.

STEP 12. Measure the voltage at output shaft 
speed sensor connector B-108.

(1) Disconnect the connector, and measure the 

voltage between terminal 2 and earth at the 
wiring harness side.

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

OK: 4.9 

− 5.1 V

Q: Is the check result normal?

YES : 

Go to Step 18.

NO : 

Go to Step 13.

STEP 13. Measure the voltage at engine-A/T-ECU 
connector C-112.
(1) Disconnect output shaft speed sensor connector 

B-108.

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

(3) Measure the voltage between engine-A/T-ECU 

connector C-112 terminal No.73 and earth. 

OK: 4.9 

− 5.1 V

Q: Is the check result normal?

AC302452AH

B-108 (GR)

Connector: B-108

Harness side

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)

AC302452AH

B-108 (GR)

Connector: B-108

Harness side

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

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-44

YES : 

Go to Step 16.

NO : 

Go to Step 14.

STEP 14. Connector check: C-112 
engine-A/T-ECU connector

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 15.

NO : 

Repair the defective connector.

STEP 15. Check the harness between output 
shaft speed sensor connector B-108 terminal 
No.2 and engine-A/T-ECU connector C-112 
terminal No.73.

Check the output line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

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

AC302452AH

B-108 (GR)

Connector: B-108

Harness side

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

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-45

STEP 16. Connector check: C-112 
engine-A/T-ECU connector 

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 17.

NO : 

Repair the defective connector.

STEP 17. Check the harness between output 
shaft speed sensor connector B-108 terminal 
No.2 and engine-A/T-ECU connector C-112 
terminal No.73.

Check the output line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

STEP 18. Measure the output wave pattern of the 
output shaft speed sensor at engine-A/T-ECU 
connector C-112 (using an oscilloscope).
(1) Shift the selector lever to the D range.
(2) Accelerate the vehicle to approximately 50 km/h 

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

AC302452AH

B-108 (GR)

Connector: B-108

Harness side

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

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-46

(shift range; 3rd).

(3) Connect an oscilloscope, and measure the 

voltage between engine-A/T-ECU connector 
C-112 terminal No.73 and earth.

OK: A wave pattern such as the one 
shown on 

P.23A-123

 (Check Procedure 

Using an Oscilloscope) should be output, 
and the maximum value should be 4.8 V 
or more and the minimum value should 
be 0.8 V or less. There should be no noise 
in the output wave pattern.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 19.

STEP 19. Connector check: C-112 
engine-A/T-ECU connector

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 20.

NO : 

Repair the defective connector.

STEP 20. Replace the output shaft speed sensor 
and then recheck the diagnosis code.
(1) Replace the output shaft speed sensor.
(2) Test drive the vehicle.
(3) Check if the diagnosis code is set.

Q: Is diagnosis code 23 set?

YES : 

Go to Step 21.

NO : 

The inspection is complete.

STEP 21. Check the transfer drive gear and 
driven gear.

Visually check the transfer drive gear and driven 
gear for damage.

Q: Is the check result normal?

YES : 

Eliminate the cause of the noise.

NO : 

Replace the transfer drive gear and driven 
gear.

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

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