Infiniti Q45. Manual - part 38

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

3. ATF pressure switch 1 and front brake solenoid valve

AT-165

4. ATF pressure switch 5 and direct clutch solenoid valve

AT-169

5. CAN communication line

6. Line pressure test

7. Control valve with TCM

OFF vehicle

8. Front brake (brake band)

9. Input clutch

In “D” or “M” position,
does not downshift to
3rd gear.

ON vehicle

1. A/T fluid level and state

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

3. ATF pressure switch 3 and input clutch solenoid valve

AT-167

AT-141

4. ATF pressure switch 1 and front brake solenoid valve

AT-165

5. CAN communication line

6. Line pressure test

7. Control valve with TCM

OFF vehicle

8. Input clutch

In “D” or “M” position,
does not downshift to
2nd gear.

ON vehicle

1. A/T fluid level and state

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

3. ATF pressure switch 6, high and low reverse clutch sole-
noid valve

AT-171

AT-153

4. CAN communication line

5. Line pressure test

6. Control valve with TCM

OFF vehicle

7. High and low reverse clutch

In “D” or “M” position,
does not downshift to
1st gear.

ON vehicle

1. A/T fluid level and state

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

3. ATF pressure switch 5 and direct clutch solenoid valve

AT-169

4. CAN communication line

5. Line pressure test

6. Control valve with TCM

OFF vehicle

7. Direct clutch

AT-294

No.

Items

Symptom

Condition

Diagnostic Item

Reference

page

AT-66

TROUBLE DIAGNOSIS

Slips/Will
Not
Engage

When “D” or “M” posi-
tion, remains in 1st
gear.

ON vehicle

1. A/T fluid level and state

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

3. Direct clutch solenoid valve

4. Line pressure test

5. CAN communication line

6. Control valve with TCM

OFF vehicle

7. 3rd one-way clutch

8. 1st one-way clutch

AT-287

9. Gear system

10. Reverse brake

AT-17, "Cross-Sectional View"

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

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

When “D” or “M” posi-
tion, remains in 2nd
gear.

ON vehicle

1. A/T fluid level and state

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

3. Low coast brake solenoid valve

AT-157

4. Line pressure test

5. CAN communication line

6. Control valve with TCM

OFF vehicle

7. 3rd one-way clutch

8. Gear system

9. Direct clutch

AT-294

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

When “D” or “M” posi-
tion, remains in 3rd
gear.

ON vehicle

1. A/T fluid level and state

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

3. Line pressure test

4. CAN communication line

5. Control valve with TCM

OFF vehicle

6. 3rd one-way clutch

7. Gear system

8. High and low reverse clutch

AT-17, "Cross-Sectional View"

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

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

No.

Items

Symptom

Condition

Diagnostic Item

Reference

page

TROUBLE DIAGNOSIS

AT-67

Slips/Will
Not
Engage

When “D” or “M” posi-
tion, remains in 4th
gear.

ON vehicle

1. A/T fluid level and state

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

3. ATF pressure switch 3 and input clutch solenoid valve

AT-167

AT-141

4. ATF pressure switch 5 and direct clutch solenoid valve

AT-169

5. ATF pressure switch 6, high and low reverse clutch sole-
noid valve

AT-171

AT-153

6. Low coast brake solenoid valve

AT-157

7. Front brake solenoid valve

8. Line pressure test

9. CAN communication line

10. Control valve with TCM

OFF vehicle

11. Input clutch

12. Gear system

13. High and low reverse clutch

14. Direct clutch

AT-294

When “D” or “M” posi-
tion, remains in 5th
gear.

ON vehicle

1. A/T fluid level and state

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

3. ATF pressure switch 1 and front brake solenoid valve

AT-165

4. Line pressure test

5. CAN communication line

6. Control valve with TCM

OFF vehicle

7. Front brake (brake band)

8. Input clutch

9. Gear system

10. High and low reverse clutch

"Vehicle Cannot Be
Started from D

No.

Items

Symptom

Condition

Diagnostic Item

Reference

page

AT-68

TROUBLE DIAGNOSIS

Slips/Will
Not
Engage

Vehicle cannot be
started from D

Refer to

AT-192,

ON vehicle

1. A/T fluid level and state

2. Accelerator pedal position sensor

AT-126

3. Line pressure test

4. CAN communication line

5. Control valve with TCM

OFF vehicle

6. Torque converter

7. Oil pump assembly

AT-277

8. 3rd one-way clutch

9. 1st one-way clutch

AT-287

10. Gear system

11. Reverse brake

AT-17, "Cross-Sectional View"

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

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

Does not lock-up.
Refer to

AT-202, "A/T

Does Not Lock-up"

ON vehicle

1. A/T fluid level and state

2. Line pressure test

3. Engine speed signal

AT-118

4. Turbine revolution sensor

AT-111

5. Torque converter clutch solenoid valve

AT-120

6. CAN communication line

7. Control valve with TCM

OFF vehicle

8. Torque converter

Does Not Hold Lock-
up Condition"

9. Oil pump assembly

AT-277

Does not hold lock-up
condition.
Refer to

AT-203, "A/T

ON vehicle

1. A/T fluid level and state

2. Line pressure test

3. Engine speed signal

AT-118

4. Turbine revolution sensor

AT-111

5. Torque converter clutch solenoid valve

AT-120

6. CAN communication line

7. Control valve with TCM

OFF vehicle

8. Torque converter