Infiniti Q45. Manual — part 41
TROUBLE DIAGNOSIS
AT-77
D
E
F
G
H
I
J
K
L
M
A
B
AT
44
Slips/Will
Not
Engage
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
45
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
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
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.
Items
Symptom
Condition
Diagnostic Item
Reference
page
AT-78
TROUBLE DIAGNOSIS
48
Does Not
Change
Does not change M4
→
M3.
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 and ATF pressure switch 3
6. CAN communication line
7. Control valve with TCM
OFF vehicle
8. Front brake (brake band)
9. Input clutch
49
Does not change M3
→
M2.
ON vehicle
1. PNP switch
2. A/T fluid level and state
3. A/T position
4. Manual mode switch
5. ATF pressure switch 6
6. CAN communication line
7. Control valve with TCM
OFF vehicle
8. Front brake (brake band)
9. Input clutch
10. High and low reverse clutch
50
Does not change M2
→
M1.
ON vehicle
1. PNP switch
2. A/T fluid level and state
3. A/T position
4. Manual mode switch
5. ATF pressure switch 5
6. CAN communication line
7. Control valve with TCM
OFF vehicle
8. Input clutch
9. High and low reverse clutch
10. Direct clutch
51
Cannot be changed to
manual mode.
Refer to
"Cannot Be Changed
to Manual Mode"
ON vehicle
1. Manual mode switch
2. Turbine revolution sensor
3. CAN communication line
52
Others
Shift point is high in
“D” position.
ON vehicle
1. Vehicle speed sensor·A/T and vehicle speed sensor·MTR
2. Accelerator pedal position sensor
3. CAN communication line
4. A/T fluid temperature sensor
5. Control valve with TCM
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
TROUBLE DIAGNOSIS
AT-79
D
E
F
G
H
I
J
K
L
M
A
B
AT
53
Others
Shift point is low in “D”
position.
ON vehicle
1. Vehicle speed sensor·A/T and vehicle speed sensor·MTR
2. Accelerator pedal position sensor
3. CAN communication line
4. Control valve with TCM
54
Judder occurs during
lock-up.
ON vehicle
1. A/T fluid level and state
2. Engine speed signal
3. Turbine revolution sensor
4. Vehicle speed sensor·A/T and vehicle speed sensor·MTR
5. Accelerator pedal position sensor
6. CAN communication line
7. Torque converter clutch solenoid valve
8. Control valve with TCM
OFF vehicle
9. Torque converter
55
Strange noise in “R”
position.
ON vehicle
1. A/T fluid level and state
2. Engine speed signal
3. CAN communication line
4. Control valve with TCM
OFF vehicle
5. Torque converter
6. Oil pump assembly
7. Gear system
8. High and low reverse clutch
9. Reverse brake
56
Strange noise in “N”
position.
ON vehicle
1. A/T fluid level and state
2. Engine speed signal
3. CAN communication line
4. Control valve with TCM
OFF vehicle
5. Torque converter
6. Oil pump assembly
7. Gear system
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
AT-80
TROUBLE DIAGNOSIS
57
Others
Strange noise in “D”
position.
ON vehicle
1. A/T fluid level and state
2. Engine speed signal
3. CAN communication line
4. Control valve with TCM
OFF vehicle
5. Torque converter
6. Oil pump assembly
7. Gear system
8. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
58
Vehicle dose not
decelerate by engine
brake.
Refer to
"Vehicle Does Not
Decelerate By Engine
Brake"
ON vehicle
1. PNP switch
2. A/T fluid level and state
3. A/T position
4. Manual mode switch
5. ATF pressure switch 5
6. CAN communication line
7. Control valve with TCM
OFF vehicle
8. Input clutch
9. High and low reverse clutch
10. Direct clutch
59
Engine brake does
not work 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)
60
Engine brake does
not work M4
→
M3.
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 and ATF pressure switch 3
6. CAN communication line
7. Control valve with TCM
OFF vehicle
8. Front brake (brake band)
9. Input clutch
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
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