Infiniti M35/M45 Y50. Manual — part 39
![](/vehicles/zatt/cen/houeebante/ifuitherc.png)
TROUBLE DIAGNOSIS
AT-79
D
E
F
G
H
I
J
K
L
M
A
B
AT
38
Slips/Will
Not
Engage
While accelerating in
2nd, engine races or
slippage occurs.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. Accelerator pedal position sensor
4. CAN communication line
5. ATF pressure switch 5 and direct clutch solenoid valve
6. Control valve with TCM
OFF vehicle
7. Torque converter
8. Oil pump assembly
9. 3rd one-way clutch
10. Gear system
11. Direct clutch
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
"Cross-Sectional View (VQ35DE Models for 2WD)"
"Cross-Sectional View (VK45DE Models for 2WD)"
"Cross-Sectional View (AWD Models)"
39
While accelerating in
3rd, engine races or
slippage occurs.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. Accelerator pedal position sensor
4. CAN communication line
5. ATF pressure switch 6, high and low reverse clutch sole-
noid valve
6. Control valve with TCM
OFF vehicle
7. Torque converter
8. Oil pump assembly
9. 3rd one-way clutch
10. Gear system
11. High and low reverse clutch
12. 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)"
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
"Cross-Sectional View (VQ35DE Models for 2WD)"
"Cross-Sectional View (VK45DE Models for 2WD)"
"Cross-Sectional View (AWD Models)"
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
![](/vehicles/zatt/cen/houeebante/kinyoko.png)
AT-80
TROUBLE DIAGNOSIS
40
Slips/Will
Not
Engage
While accelerating in
4th, engine races or
slippage occurs.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. Accelerator pedal position sensor
4. CAN communication line
5. ATF pressure switch 3 and input clutch solenoid valve
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
41
While accelerating in
5th, engine races or
slippage occurs.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. Accelerator pedal position sensor
4. CAN communication line
5. ATF pressure switch 1 and front brake solenoid valve
6. Control valve with TCM
OFF vehicle
7. Torque converter
8. Oil pump assembly
9. Front brake (brake band)
10. Input clutch
11. Gear system
12. High and low reverse clutch
42
Slips at lock-up.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. Engine speed signal
4. Turbine revolution sensor
5. Torque converter clutch solenoid valve
6. CAN communication line
7. Control valve with TCM
OFF vehicle
8. Torque converter
9. Oil pump assembly
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
![](/vehicles/zatt/cen/houeebante/besut.png)
TROUBLE DIAGNOSIS
AT-81
D
E
F
G
H
I
J
K
L
M
A
B
AT
43
Slips/Will
Not
Engage
"Vehicle Does Not
Creep Backward in
“R” Position"
"Vehicle Does Not
Creep Forward in “D”
Position"
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. Accelerator pedal position sensor
4. ATF pressure switch 5 and direct clutch solenoid valve
5. PNP switch
6. CAN communication line
7. A/T position
8. Control valve with TCM
OFF vehicle
9. Torque converter
10. Oil pump assembly
11. 1st one-way clutch
12. Gear system
13. Reverse brake
14. Direct clutch
15. 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)"
16. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
"Cross-Sectional View (VQ35DE Models for 2WD)"
"Cross-Sectional View (VK45DE Models for 2WD)"
"Cross-Sectional View (AWD Models)"
44
Vehicle cannot run in
all positions.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. PNP switch
4. A/T position
5. Control valve with TCM
OFF vehicle
6. Oil pump assembly
7. Gear system
8. Output shaft
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
![](/vehicles/zatt/cen/houeebante/dghreg.png)
AT-82
TROUBLE DIAGNOSIS
45
Slips/Will
Not
Engage
With selector lever in
“D” position, driving is
not possible.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. PNP switch
4. A/T position
5. Control valve with TCM
OFF vehicle
6. Torque converter
7. Oil pump assembly
8. 1st one-way clutch
9. Gear system
10. Reverse brake
11. 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)"
AT-19, "Cross-Sectional View (AWD Models)"
.)
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
"Cross-Sectional View (VQ35DE Models for 2WD)"
"Cross-Sectional View (VK45DE Models for 2WD)"
or
"Cross-Sectional View (AWD Models)"
46
With selector lever in
“R” position, driving is
not possible.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. PNP switch
4. A/T position
5. Control valve with TCM
OFF vehicle
6. Gear system
7. Output shaft
8. Reverse brake
47
Does Not
Change
Does not change 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
6. CAN communication line
7. Control valve with TCM
OFF vehicle
8. Front brake (brake band)
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
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