Infiniti M35/M45 Y50. Manual — part 40

TROUBLE DIAGNOSIS

AT-83

D

E

F

G

H

I

J

K

L

M

A

B

AT

48

Does Not
Change

Does not change M4

→

M3.

Refer to

AT-215, "A/T

Does Not Shift: 4th
Gear

→

3rd Gear"

.

ON vehicle

1. PNP switch

AT-113

2. A/T fluid level and state

AT-53

3. A/T position

AT-227

4. Manual mode switch

AT-167

5. ATF pressure switch 1 and ATF pressure switch 3

AT-172

,

AT-174

6. CAN communication line

AT-105

7. Control valve with TCM

AT-236

OFF vehicle

8. Front brake (brake band)

AT-301

9. Input clutch

AT-327

49

Does not change M3

→

M2.

Refer to

AT-217, "A/T

Does Not Shift: 3rd
Gear

→

2nd Gear"

.

ON vehicle

1. PNP switch

AT-113

2. A/T fluid level and state

AT-53

3. A/T position

AT-227

4. Manual mode switch

AT-167

5. ATF pressure switch 6

AT-178

6. CAN communication line

AT-105

7. Control valve with TCM

AT-236

OFF vehicle

8. Front brake (brake band)

AT-301

9. Input clutch

AT-327

10. High and low reverse clutch

AT-339

50

Does not change M2

→

M1.

Refer to

AT-218, "A/T

Does Not Shift: 2nd
Gear

→

1st Gear"

.

ON vehicle

1. PNP switch

AT-113

2. A/T fluid level and state

AT-53

3. A/T position

AT-227

4. Manual mode switch

AT-167

5. ATF pressure switch 5

AT-176

6. CAN communication line

AT-105

7. Control valve with TCM

AT-236

OFF vehicle

8. Input clutch

AT-327

9. High and low reverse clutch

AT-339

10. Direct clutch

AT-341

51

Cannot be changed to
manual mode.
Refer to

AT-213,

"Cannot Be Changed
to Manual Mode"

.

ON vehicle

1. Manual mode switch

AT-167

2. Turbine revolution sensor

AT-117

3. CAN communication line

AT-105

52

Others

Shift point is high in
“D” position.

ON vehicle

1. Vehicle speed sensor·A/T and vehicle speed sensor·MTR

AT-119

,

AT-140

2. Accelerator pedal position sensor

AT-132

3. CAN communication line

AT-105

4. A/T fluid temperature sensor

AT-135

5. Control valve with TCM

AT-236

No.

Item

Symptom

Condition

Diagnostic Item

Reference

page

AT-84

TROUBLE DIAGNOSIS

53

Others

Shift point is low in “D”
position.

ON vehicle

1. Vehicle speed sensor·A/T and vehicle speed sensor·MTR

AT-119

,

AT-140

2. Accelerator pedal position sensor

AT-132

3. CAN communication line

AT-105

4. Control valve with TCM

AT-236

54

Judder occurs during
lock-up.

ON vehicle

1. A/T fluid level and state

AT-53

2. Engine speed signal

AT-124

3. Turbine revolution sensor

AT-117

4. Vehicle speed sensor·A/T and vehicle speed sensor·MTR

AT-119

,

AT-140

5. Accelerator pedal position sensor

AT-132

6. CAN communication line

AT-105

7. Torque converter clutch solenoid valve

AT-126

8. Control valve with TCM

AT-236

OFF vehicle

9. Torque converter

AT-301

55

Strange noise in “R”
position.

ON vehicle

1. A/T fluid level and state

AT-53

2. Engine speed signal

AT-124

3. CAN communication line

AT-105

4. Control valve with TCM

AT-236

OFF vehicle

5. Torque converter

AT-301

6. Oil pump assembly

AT-322

7. Gear system

AT-281

8. High and low reverse clutch

AT-339

9. Reverse brake

AT-301

56

Strange noise in “N”
position.

ON vehicle

1. A/T fluid level and state

AT-53

2. Engine speed signal

AT-124

3. CAN communication line

AT-105

4. Control valve with TCM

AT-236

OFF vehicle

5. Torque converter

AT-301

6. Oil pump assembly

AT-322

7. Gear system

AT-281

No.

Item

Symptom

Condition

Diagnostic Item

Reference

page

TROUBLE DIAGNOSIS

AT-85

D

E

F

G

H

I

J

K

L

M

A

B

AT

57

Others

Strange noise in “D”
position.

ON vehicle

1. A/T fluid level and state

AT-53

2. Engine speed signal

AT-124

3. CAN communication line

AT-105

4. Control valve with TCM

AT-236

OFF vehicle

5. Torque converter

AT-301

6. Oil pump assembly

AT-322

7. Gear system

AT-281

8. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to

AT-17,

"Cross-Sectional View (VQ35DE Models for 2WD)"

,

AT-18,

"Cross-Sectional View (VK45DE Models for 2WD)"

or

AT-19,

"Cross-Sectional View (AWD Models)"

.)

AT-301

58

Vehicle dose not
decelerate by engine
brake.
Refer to

AT-220,

"Vehicle Does Not
Decelerate by Engine
Brake"

.

ON vehicle

1. PNP switch

AT-113

2. A/T fluid level and state

AT-53

3. A/T position

AT-227

4. Manual mode switch

AT-167

5. ATF pressure switch 5

AT-176

6. CAN communication line

AT-105

7. Control valve with TCM

AT-236

OFF vehicle

8. Input clutch

AT-327

9. High and low reverse clutch

AT-339

10. Direct clutch

AT-341

59

Engine brake does
not work M5

→

M4.

ON vehicle

1. PNP switch

AT-113

2. A/T fluid level and state

AT-53

3. A/T position

AT-227

4. Manual mode switch

AT-167

5. ATF pressure switch 1

AT-172

6. CAN communication line

AT-105

7. Control valve with TCM

AT-236

OFF vehicle

8. Front brake (brake band)

AT-301

60

Engine brake does
not work M4

→

M3.

ON vehicle

1. PNP switch

AT-113

2. A/T fluid level and state

AT-53

3. A/T position

AT-227

4. Manual mode switch

AT-167

5. ATF pressure switch 1 and ATF pressure switch 3

AT-172

,

AT-174

6. CAN communication line

AT-105

7. Control valve with TCM

AT-236

OFF vehicle

8. Front brake (brake band)

AT-301

9. Input clutch

AT-327

No.

Item

Symptom

Condition

Diagnostic Item

Reference

page

AT-86

TROUBLE DIAGNOSIS

61

Others

Engine brake does
not work M3

→

M2.

ON vehicle

1. PNP switch

AT-113

2. A/T fluid level and state

AT-53

3. A/T position

AT-227

4. Manual mode switch

AT-167

5. ATF pressure switch 6

AT-178

6. CAN communication line

AT-105

7. Control valve with TCM

AT-236

OFF vehicle

8. Front brake (brake band)

AT-301

9. Input clutch

AT-327

10. High and low reverse clutch

AT-339

62

Engine brake does
not work M2

→

M1.

ON vehicle

1. PNP switch

AT-113

2. A/T fluid level and state

AT-53

3. A/T position

AT-227

4. Manual mode switch

AT-167

5. ATF pressure switch 5

AT-176

6. CAN communication line

AT-105

7. Control valve with TCM

AT-236

OFF vehicle

8. Input clutch

AT-327

9. High and low reverse clutch

AT-339

10. Direct clutch

AT-341

63

Maximum speed low.

ON vehicle

1. A/T fluid level and state

AT-53

2. Line pressure test

AT-55

3. Accelerator pedal position sensor

AT-132

4. CAN communication line

AT-105

5. Direct clutch solenoid valve

AT-155

6. Control valve with TCM

AT-236

OFF vehicle

7. Torque converter

AT-301

8. Oil pump assembly

AT-322

9. Input clutch

AT-327

10. Gear system

AT-281

11. High and low reverse clutch

AT-339

12. Direct clutch

AT-341

13. Forward one-way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to

AT-17, "Cross-Sectional View (VQ35DE Models for 2WD)"

,

AT-18, "Cross-Sectional View (VK45DE Models for 2WD)"

or

AT-19, "Cross-Sectional View (AWD Models)"

.)

AT-301

14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to

AT-17,

"Cross-Sectional View (VQ35DE Models for 2WD)"

,

AT-18,

"Cross-Sectional View (VK45DE Models for 2WD)"

or

AT-19,

"Cross-Sectional View (AWD Models)"

.)

AT-301

No.

Item

Symptom

Condition

Diagnostic Item

Reference

page