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
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
15
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.
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
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
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
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
20
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
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
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
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
22
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
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
AT-68
TROUBLE DIAGNOSIS
23
Slips/Will
Not
Engage
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
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
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
25
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
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
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