Infiniti M35/M45 Y50. Manual — part 37
TROUBLE DIAGNOSIS
AT-71
D
E
F
G
H
I
J
K
L
M
A
B
AT
20
Slips/Will
Not
Engage
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
9. 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)"
10. 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)"
21
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
4. ATF pressure switch 5 and direct clutch solenoid valve
5. ATF pressure switch 6, high and low reverse clutch sole-
noid valve
6. Low coast brake solenoid valve
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
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
AT-72
TROUBLE DIAGNOSIS
22
Slips/Will
Not
Engage
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
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
23
Vehicle cannot be
started from D
1
.
"Vehicle Cannot Be
Started from D
ON vehicle
1. A/T fluid level and state
2. Accelerator pedal position sensor
3. Line pressure test
4. CAN communication line
5. Control valve with TCM
OFF vehicle
6. Torque converter
7. Oil pump assembly
8. 3rd one-way clutch
9. 1st one-way clutch
10. Gear system
11. Reverse brake
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)"
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)"
or
"Cross-Sectional View (AWD Models)"
24
.
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
TROUBLE DIAGNOSIS
AT-73
D
E
F
G
H
I
J
K
L
M
A
B
AT
25
Slips/Will
Not
Engage
Does not hold lock-up
condition.
Refer to
Does Not Hold Lock-
up Condition"
.
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
26
Lock-up is not
released.
Refer to
.
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
27
No shock at all or the
clutch slips when
vehicle changes
speed D
1
→
D
2
or
M
1
→
M
2
.
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
4. CAN communication line
5. Line pressure test
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)"
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
AT-74
TROUBLE DIAGNOSIS
28
Slips/Will
Not
Engage
No shock at all or the
clutch slips when
vehicle changes
speed D
2
→
D
3
or
M
2
→
M
3
.
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
4. CAN communication line
5. Line pressure test
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)"
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)"
or
"Cross-Sectional View (AWD Models)"
29
No shock at all or the
clutch slips when
vehicle changes
speed D
3
→
D
4
or
M
3
→
M
4
.
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
4. ATF pressure switch 1 and front brake solenoid valve
5. CAN communication line
6. Line pressure test
7. Control valve with TCM
OFF vehicle
8. Torque converter
9. Oil pump assembly
10. Input clutch
11. Gear system
12. High and low reverse clutch
13. Direct clutch
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
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