Infiniti Q45. Manual — part 38



TROUBLE DIAGNOSIS

AT-65

D

E

F

G

H

I

J

K

L

M

A

B

AT

14

No Down
Shift

In “D” or “M” position,
does not downshift to
4th gear.

ON vehicle

1. A/T fluid level and state

AT-51

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

AT-113

,

AT-134

3. ATF pressure switch 1 and front brake solenoid valve

AT-165

,

AT-145

4. ATF pressure switch 5 and direct clutch solenoid valve

AT-169

,

AT-149

5. CAN communication line

AT-99

6. Line pressure test

AT-53

7. Control valve with TCM

AT-225

OFF vehicle

8. Front brake (brake band)

AT-261

9. Input clutch

AT-282

15

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

ON vehicle

1. A/T fluid level and state

AT-51

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

AT-113

,

AT-134

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

,

AT-145

5. CAN communication line

AT-99

6. Line pressure test

AT-53

7. Control valve with TCM

AT-225

OFF vehicle

8. Input clutch

AT-282

16

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

ON vehicle

1. A/T fluid level and state

AT-51

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

AT-113

,

AT-134

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

AT-171

,

AT-153

4. CAN communication line

AT-99

5. Line pressure test

AT-53

6. Control valve with TCM

AT-225

OFF vehicle

7. High and low reverse clutch

AT-292

17

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

ON vehicle

1. A/T fluid level and state

AT-51

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

AT-113

,

AT-134

3. ATF pressure switch 5 and direct clutch solenoid valve

AT-169

,

AT-149

4. CAN communication line

AT-99

5. Line pressure test

AT-53

6. Control valve with TCM

AT-225

OFF vehicle

7. Direct clutch

AT-294

No.

Items

Symptom

Condition

Diagnostic Item

Reference

page

AT-66

TROUBLE DIAGNOSIS

18

Slips/Will
Not
Engage

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

ON vehicle

1. A/T fluid level and state

AT-51

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

AT-113

,

AT-134

3. Direct clutch solenoid valve

AT-149

4. Line pressure test

AT-53

5. CAN communication line

AT-99

6. Control valve with TCM

AT-225

OFF vehicle

7. 3rd one-way clutch

AT-280

8. 1st one-way clutch

AT-287

9. Gear system

AT-253

10. Reverse brake

AT-261

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

AT-17, "Cross-Sectional View"

.

AT-249

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

AT-17,

"Cross-Sectional View"

.

AT-249

19

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

ON vehicle

1. A/T fluid level and state

AT-51

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

AT-113

,

AT-134

3. Low coast brake solenoid valve

AT-157

4. Line pressure test

AT-53

5. CAN communication line

AT-99

6. Control valve with TCM

AT-225

OFF vehicle

7. 3rd one-way clutch

AT-280

8. Gear system

AT-253

9. Direct clutch

AT-294

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

AT-17,

"Cross-Sectional View"

.

AT-249

20

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

ON vehicle

1. A/T fluid level and state

AT-51

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

AT-113

,

AT-134

3. Line pressure test

AT-53

4. CAN communication line

AT-99

5. Control valve with TCM

AT-225

OFF vehicle

6. 3rd one-way clutch

AT-280

7. Gear system

AT-253

8. High and low reverse clutch

AT-292

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

AT-17, "Cross-Sectional View"

.

AT-249

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

AT-17,

"Cross-Sectional View"

.

AT-249

No.

Items

Symptom

Condition

Diagnostic Item

Reference

page

TROUBLE DIAGNOSIS

AT-67

D

E

F

G

H

I

J

K

L

M

A

B

AT

21

Slips/Will
Not
Engage

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

ON vehicle

1. A/T fluid level and state

AT-51

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

AT-113

,

AT-134

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

,

AT-149

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

AT-145

8. Line pressure test

AT-53

9. CAN communication line

AT-99

10. Control valve with TCM

AT-225

OFF vehicle

11. Input clutch

AT-282

12. Gear system

AT-253

13. High and low reverse clutch

AT-292

14. Direct clutch

AT-294

22

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

ON vehicle

1. A/T fluid level and state

AT-51

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

AT-113

,

AT-134

3. ATF pressure switch 1 and front brake solenoid valve

AT-165

,

AT-145

4. Line pressure test

AT-53

5. CAN communication line

AT-99

6. Control valve with TCM

AT-225

OFF vehicle

7. Front brake (brake band)

AT-261

8. Input clutch

AT-282

9. Gear system

AT-253

10. High and low reverse clutch

AT-292

No.

Items

Symptom

Condition

Diagnostic Item

Reference

page

AT-68

TROUBLE DIAGNOSIS

23

Slips/Will
Not
Engage

Vehicle cannot be
started from D

1

.

Refer to

AT-192,

"Vehicle Cannot Be
Started from D

1

"

.

ON vehicle

1. A/T fluid level and state

AT-51

2. Accelerator pedal position sensor

AT-126

3. Line pressure test

AT-53

4. CAN communication line

AT-99

5. Control valve with TCM

AT-225

OFF vehicle

6. Torque converter

AT-261

7. Oil pump assembly

AT-277

8. 3rd one-way clutch

AT-280

9. 1st one-way clutch

AT-287

10. Gear system

AT-253

11. Reverse brake

AT-261

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

AT-17, "Cross-Sectional View"

.

AT-249

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

AT-17,

"Cross-Sectional View"

.

AT-249

24

Does not lock-up.
Refer to

AT-202, "A/T

Does Not Lock-up"

.

ON vehicle

1. A/T fluid level and state

AT-51

2. Line pressure test

AT-53

3. Engine speed signal

AT-118

4. Turbine revolution sensor

AT-111

5. Torque converter clutch solenoid valve

AT-120

6. CAN communication line

AT-99

7. Control valve with TCM

AT-225

OFF vehicle

8. Torque converter

AT-261

9. Oil pump assembly

AT-277

25

Does not hold lock-up
condition.
Refer to

AT-203, "A/T

Does Not Hold Lock-
up Condition"

.

ON vehicle

1. A/T fluid level and state

AT-51

2. Line pressure test

AT-53

3. Engine speed signal

AT-118

4. Turbine revolution sensor

AT-111

5. Torque converter clutch solenoid valve

AT-120

6. CAN communication line

AT-99

7. Control valve with TCM

AT-225

OFF vehicle

8. Torque converter

AT-261

9. Oil pump assembly

AT-277

No.

Items

Symptom

Condition

Diagnostic Item

Reference

page

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Политика конфиденциальности