Infiniti M35/M45 Y50. Manual — part 36
TROUBLE DIAGNOSIS
AT-67
D
E
F
G
H
I
J
K
L
M
A
B
AT
8
Shift
Shock
Shock is too large for
lock-up.
ON vehicle
1. Accelerator pedal position sensor
2. A/T position
3. Engine speed signal
4. CAN communication line
5. Turbine revolution sensor
6. Vehicle speed sensor·A/T and vehicle speed sensor·MTR
7. Torque converter clutch solenoid valve
8. A/T fluid level and state
9. Control valve with TCM
OFF vehicle
10. Torque converter
9
Shock is too large
during engine brake.
ON vehicle
1. Accelerator pedal position sensor
2. A/T position
3. CAN communication line
4. A/T fluid level and state
5. Control valve with TCM
OFF vehicle
6. Front brake (brake band)
7. Input clutch
8. High and low reverse clutch
9. Direct clutch
10
No Up
Shift
Gear does not change
from D
1
→
D
2
or from
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. Line pressure test
5. CAN communication line
6. Control valve with TCM
OFF vehicle
7. Direct clutch
11
Gear does not change
from D
2
→
D
3
or from
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. Line pressure test
5. CAN communication line
6. Control valve with TCM
OFF vehicle
7. High and low reverse clutch
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
AT-68
TROUBLE DIAGNOSIS
12
No Up
Shift
Gear does not change
from D
3
→
D
4
or from
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. Line pressure test
6. CAN communication line
7. Control valve with TCM
OFF vehicle
8. Input clutch
13
Gear does not change
from D
4
→
D
5
or from
M
4
→
M
5
.
.
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. ATF pressure switch 5 and direct clutch solenoid valve
5. Turbine revolution sensor
6. Line pressure test
7. CAN communication line
8. Control valve with TCM
OFF vehicle
9. Front brake (brake band)
10. Input clutch
14
No Down
Shift
In “D” or “M” position,
does not downshift to
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 1 and front brake solenoid valve
4. ATF pressure switch 5 and direct clutch solenoid valve
5. CAN communication line
6. Line pressure test
7. Control valve with TCM
OFF vehicle
8. Front brake (brake band)
9. Input clutch
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
TROUBLE DIAGNOSIS
AT-69
D
E
F
G
H
I
J
K
L
M
A
B
AT
15
No Down
Shift
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
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. Input clutch
16
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
4. CAN communication line
5. Line pressure test
6. Control valve with TCM
OFF vehicle
7. High and low reverse clutch
17
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
4. CAN communication line
5. Line pressure test
6. Control valve with TCM
OFF vehicle
7. Direct clutch
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
AT-70
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
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
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)"
19
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
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
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)"
or
"Cross-Sectional View (AWD Models)"
No.
Item
Symptom
Condition
Diagnostic Item
Reference
page
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