Mitsubishi Grandis. Manual - part 837

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-15

SHIFT PATTERN

M1231028400211

UPSHIFT PATTERN

9

Selector lever 
position: N 
(Must be done 
on a level and 
straight road) 

Selector lever 
position and vehicle 
speed

(1) Select R and 

drive at 10 km/h

The ration of data list 
No.0001 and 
No.0002 should be 
the same as the 
transmission ratio 
when reversing

No shifting 22

Input shaft 
speed 
sensor 
system

23

Output 
shaft speed 
sensor 
system

46

Reverse 
without 
completion 
of shifting

Proced
ure

Pre-test/opera
tion 
conditions

Test/operation

Judgment value

Check 
item

Diagnosis 
code No.

Inspection 
procedure 
if there is 
an 
abnormalit
y

AC311757

100

50

0

4.5

4.0

3.0

0.5

1.0

2.0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

100

50

0

150

200

Throttle

opening

voltage (V)

Throttle

Opening (%)

1

2

2

3

3

4

2     3

movement

range

3     4

movement

range

Output shaft speed r/min

Vehicle speed km/h

8,000

AC

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-16

DOWNSHIFT PATTERN

DAMPER CLUTCH CONTROL

M1231021300086

In 4th range

AC311758AB

100

50

0

1,000

2,000

4,000

5,000

3,000

6,000

7,000

100

50

0

150

200

4.5

4.0

3.0

2.0

1.0

0.5

Throttle

opening

voltage (V)

Throttle

opening (%)

Output shaft speed r/min

Vehicle speed km/h

1

2

2

3

3

4

2

3

(Sport mode)

3

4

(Sport mode)

1

2

(Sport mode)

8,000

AC313395AB

4.5

4.0

3.0

2.0

1.0

0.5

100

50

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

0

50

100

150

Damper clutch disengaged

Damper clutch engaged

Throttle

opening

voltage (V)

Throttle

opening (%)

Output shaft speed r/min

Vehicle speed km/h

8,000

200

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-17

In 3rd range

INSPECTION CHART FOR DIAGNOSIS 
CODE

M1231007900404

AC313394 AB

4.5

4.0

3.0

2.0

1.0

0.5

100

50

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

0

50

100

150

Damper clutch
disengaged

Damper clutch engaged

Throttle

opening

voltage (V)

Throttle

opening (%)

Output shaft speed r/min

Vehicle speed km/h

8,000

200

A/T 
diagnosis 
code No.

MPI 
diagnosis 
code No.

Diagnosis item

Reference page

15

P0710

A/T fluid temperature sensor system

P.23A-18

16

P.23A-23

21

−

Crank angle sensor system

Refer to GROUP 
13A, 
Troubleshooting

P.13

A-157

.

22

P0715

Input shaft speed sensor system

P.23A-27

23

P0720

Output shaft speed sensor system

P.23A-37

26

−

Stop lamp switch system

P.23A-47

27

P0705

Inhibitor switch system

P.23A-52

28

P.23A-59

31

P0750

LR solenoid valve system

P.23A-62

32

P0755

UD solenoid valve system

P.23A-65

33

P0760

2ND solenoid valve system

P.23A-68

34

P0765

OD solenoid valve system

P.23A-71

36

P0740

DCC solenoid valve system

P.23A-74

41

−

1st gear ratio does not meet the specification

P.23A-78

42

−

2nd gear ratio does not meet the specification

P.23A-78

43

−

3rd gear ratio does not meet the specification

P.23A-78

44

−

4th gear ratio does not meet the specification

P.23A-78

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-18

NOTE: The MPI diagnostic trouble codes are the codes which are set when item "MPI" is selected on 
MUT-III. However, the codes above indicate failure in the automatic transmission.

DIAGNOSTIC TROUBLE CODE 
PROCEDURES

Code No.15: A/T fluid temperature sensor system

OPERATION

• The A/T fluid temperature sensor converts the 

automatic fluid temperature to voltage, and send 
the information to the engine-A/T-ECU.

• The A/T fluid temperature rises, the resistance 

decreases. Thus, the sensor output voltage 
depends on the automatic fluid temperature. As 
the A/T fluid temperature rises, the output voltage 
will decrease.

DIAGNOSIS CODE SET CONDITIONS

If the A/T fluid temperature sensor output voltage is 
4.5 volts or more after driving for 10 minutes or more, 
there is an open circuit in the A/T fluid temperature 
sensor and diagnosis code 15 is set.

POSSIBLE CAUSES

• Malfunction of the A/T fluid temperature sensor

• Damaged harness wires and connectors

• Malfunction of the engine-A/T-ECU

46

−

Reverse gear ratio does not meet the specification

P.23A-78

52

P0740

DCC solenoid valve system

P.23A-80

54

P1751

A/T control relay system

P.23A-82

A/T 
diagnosis 
code No.

MPI 
diagnosis 
code No.

Diagnosis item

Reference page

A/T fluid temperature sensor system circuit

ENGINE-
A/T-ECU

A/T CONTROL
SOLENOID
VALVE ASSEMBLY

A/T
FLUID
TEMPERATURE
SENSOR

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