Infiniti Q45. Manual — part 40
TROUBLE DIAGNOSIS
AT-73
D
E
F
G
H
I
J
K
L
M
A
B
AT
35
Slips/Will
Not
Engage
With selector lever in
“D” position, accelera-
tion is extremely poor.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. Accelerator pedal position sensor
4. CAN communication line
5. PNP switch
6. A/T position
7. Control valve with TCM
OFF vehicle
8. Torque converter
9. Oil pump assembly
10. 1st one-way clutch
11. Gear system
12. Reverse brake
13. Forward one-way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
36
With selector lever in
“R” position, accelera-
tion is extremely poor.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. Accelerator pedal position sensor
4. ATF pressure switch 6, high and low reverse clutch sole-
noid valve
5. CAN communication line
6. PNP switch
7. A/T position
8. Control valve with TCM
OFF vehicle
9. Gear system
10. Output shaft
11. Reverse brake
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
AT-74
TROUBLE DIAGNOSIS
37
Slips/Will
Not
Engage
While starting off by
accelerating in 1st,
engine races or slip-
page occurs.
ON vehicle
1. A/T fluid level and state
2. Line pressure test
3. Accelerator pedal position sensor
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
38
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
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
TROUBLE DIAGNOSIS
AT-75
D
E
F
G
H
I
J
K
L
M
A
B
AT
39
Slips/Will
Not
Engage
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
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
40
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
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
AT-76
TROUBLE DIAGNOSIS
41
Slips/Will
Not
Engage
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
43
"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
16. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
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