Infiniti M35/M45 Y50. Manual - part 40

2. A/T fluid level and state

3. A/T position

4. Manual mode switch

5. ATF pressure switch 1 and ATF pressure switch 3

AT-172

AT-174

6. CAN communication line

7. Control valve with TCM

OFF vehicle

8. Front brake (brake band)

9. Input clutch

Does not change M3

→

M2.

Refer to

AT-217, "A/T

Does Not Shift: 3rd
Gear

→

2nd Gear"

ON vehicle

1. PNP switch

2. A/T fluid level and state

3. A/T position

4. Manual mode switch

5. ATF pressure switch 6

AT-178

6. CAN communication line

7. Control valve with TCM

OFF vehicle

8. Front brake (brake band)

9. Input clutch

10. High and low reverse clutch

Does not change M2

→

M1.

Refer to

AT-218, "A/T

Does Not Shift: 2nd
Gear

→

1st Gear"

ON vehicle

1. PNP switch

2. A/T fluid level and state

3. A/T position

4. Manual mode switch

5. ATF pressure switch 5

AT-176

6. CAN communication line

7. Control valve with TCM

OFF vehicle

8. Input clutch

9. High and low reverse clutch

10. Direct clutch

"Cannot Be Changed
to Manual Mode"

Cannot be changed to
manual mode.
Refer to

AT-213,

ON vehicle

1. Manual mode switch

2. Turbine revolution sensor

AT-117

3. CAN communication line

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

3. CAN communication line

4. A/T fluid temperature sensor

AT-135

5. Control valve with TCM

No.

Item

Symptom

Condition

Diagnostic Item

Reference

page

AT-84

TROUBLE DIAGNOSIS

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

3. CAN communication line

4. Control valve with TCM

Judder occurs during
lock-up.

ON vehicle

1. A/T fluid level and state

2. Engine speed signal

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

6. CAN communication line

7. Torque converter clutch solenoid valve

AT-126

8. Control valve with TCM

OFF vehicle

9. Torque converter

Strange noise in “R”
position.

ON vehicle

1. A/T fluid level and state

2. Engine speed signal

3. CAN communication line

4. Control valve with TCM

OFF vehicle

5. Torque converter

6. Oil pump assembly

AT-322

7. Gear system

AT-281

8. High and low reverse clutch

9. Reverse brake

Strange noise in “N”
position.

ON vehicle

1. A/T fluid level and state

2. Engine speed signal

3. CAN communication line

4. Control valve with TCM

OFF vehicle

5. Torque converter

6. Oil pump assembly

AT-322

7. Gear system

AT-281

No.

Item

Symptom

Condition

Diagnostic Item

Reference

page

TROUBLE DIAGNOSIS

AT-85

Others

Strange noise in “D”
position.

ON vehicle

1. A/T fluid level and state

2. Engine speed signal

3. CAN communication line

4. Control valve with TCM

OFF vehicle

5. Torque converter

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

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,

AT-18,

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

AT-19,

"Cross-Sectional View (AWD Models)"

"Vehicle Does Not
Decelerate by Engine
Brake"

Vehicle dose not
decelerate by engine
brake.
Refer to

AT-220,

ON vehicle

1. PNP switch

2. A/T fluid level and state

3. A/T position

4. Manual mode switch

5. ATF pressure switch 5

AT-176

6. CAN communication line

7. Control valve with TCM

OFF vehicle

8. Input clutch

9. High and low reverse clutch

10. Direct clutch

Engine brake does
not work M5

→

M4.

ON vehicle

1. PNP switch

2. A/T fluid level and state

3. A/T position

4. Manual mode switch

5. ATF pressure switch 1

AT-172

6. CAN communication line

7. Control valve with TCM

OFF vehicle

8. Front brake (brake band)

Engine brake does
not work M4

→

M3.

ON vehicle

1. PNP switch

2. A/T fluid level and state

3. A/T position

4. Manual mode switch

5. ATF pressure switch 1 and ATF pressure switch 3

AT-172

AT-174

6. CAN communication line

7. Control valve with TCM

OFF vehicle

8. Front brake (brake band)

9. Input clutch

No.

Item

Symptom

Condition

Diagnostic Item

Reference

page

AT-86

TROUBLE DIAGNOSIS

Others

Engine brake does
not work M3

→

M2.

ON vehicle

1. PNP switch

2. A/T fluid level and state

3. A/T position

4. Manual mode switch

5. ATF pressure switch 6

AT-178

6. CAN communication line

7. Control valve with TCM

OFF vehicle

8. Front brake (brake band)

9. Input clutch

10. High and low reverse clutch

Engine brake does
not work M2

→

M1.

ON vehicle

1. PNP switch

2. A/T fluid level and state

3. A/T position

4. Manual mode switch

5. ATF pressure switch 5

AT-176

6. CAN communication line

7. Control valve with TCM

OFF vehicle

8. Input clutch

9. High and low reverse clutch

10. Direct clutch

Maximum speed low.

ON vehicle

1. A/T fluid level and state

2. Line pressure test

AT-55

3. Accelerator pedal position sensor

4. CAN communication line

5. Direct clutch solenoid valve

AT-155

6. Control valve with TCM

OFF vehicle

7. Torque converter

8. Oil pump assembly

9. Input clutch

10. Gear system

11. High and low reverse clutch

12. Direct clutch

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

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

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

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

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

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

AT-17,

AT-18,

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

AT-19,

"Cross-Sectional View (AWD Models)"