Infiniti Q45. Manual — part 37
TROUBLE DIAGNOSIS
AT-61
D
E
F
G
H
I
J
K
L
M
A
B
AT
Symptom Chart
NCS000UK
●
The diagnostics item numbers show the sequence for inspection. Inspect in order from Item 1.
●
Overhaul and inspection inside the A/T only if A/T fluid condition is NG. Refer to
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
1
Shift
Shock
Large shock. (“N”
→
"Large Shock (“N” to
“D” Position)"
ON vehicle
1. Engine idle speed
2. Engine speed signal
3. Accelerator pedal position sensor
4. A/T position
5. A/T fluid temperature sensor
6. ATF pressure switch 1 and front brake solenoid valve
7. CAN communication line
8. A/T fluid level and state
9. Line pressure test
10. Control valve with TCM
OFF vehicle
11. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
2
Shock is too large
when changing D
1
→
D
2
or M
1
→
M
2
.
ON vehicle
1. Accelerator pedal position sensor
2. A/T position
3. ATF pressure switch 5 and direct clutch solenoid valve
4. CAN communication line
5. Engine speed signal
6. Turbine revolution sensor
7. Vehicle speed sensor·A/T and vehicle speed sensor·MTR
8. A/T fluid level and state
9. Control valve with TCM
OFF vehicle
10. Direct clutch
3
Shock is too large
when changing D
2
→
D
3
or M
2
→
M
3
.
ON vehicle
1. Accelerator pedal position sensor
2. A/T position
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valve
4. CAN communication line
5. Engine speed signal
6. Turbine revolution sensor
7. Vehicle speed sensor·A/T and vehicle speed sensor·MTR
8. A/T fluid level and state
9. Control valve with TCM
OFF vehicle
10. High and low reverse clutch
AT-62
TROUBLE DIAGNOSIS
4
Shift
Shock
Shock is too large
when changing D
3
→
D
4
or M
3
→
M
4
.
ON vehicle
1. Accelerator pedal position sensor
2. A/T position
3. ATF pressure switch 3 and input clutch solenoid valve
4. CAN communication line
5. Engine speed signal
6. Turbine revolution sensor
7. Vehicle speed sensor·A/T and vehicle speed sensor·MTR
8. A/T fluid level and state
9. Control valve with TCM
OFF vehicle
10. Input clutch
5
Shock is too large
when changing D
4
→
D
5
or M
4
→
M
5
.
ON vehicle
1. Accelerator pedal position sensor
2. A/T position
3. ATF pressure switch 1 and front brake solenoid valve
4. CAN communication line
5. Engine speed signal
6. Turbine revolution sensor
7. Vehicle speed sensor·A/T and vehicle speed sensor·MTR
8. A/T fluid level and state
9. Control valve with TCM
OFF vehicle
10. Front brake (brake band)
11. Input clutch
6
Shock is too large for
downshift when accel-
erator pedal is
pressed.
ON vehicle
1. Accelerator pedal position sensor
2. A/T position
3. CAN communication line
4. Engine speed signal
5. Turbine revolution sensor
6. Vehicle speed sensor·A/T and vehicle speed sensor·MTR
7. A/T fluid level and state
8. Control valve with TCM
OFF vehicle
9. Front brake (brake band)
10. Input clutch
11. High and low reverse clutch
12. Direct clutch
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
TROUBLE DIAGNOSIS
AT-63
D
E
F
G
H
I
J
K
L
M
A
B
AT
7
Shift
Shock
Shock is too large for
upshift when acceler-
ator pedal is released.
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. A/T fluid level and state
8. Control valve with TCM
OFF vehicle
9. Front brake (brake band)
10. Input clutch
11. High and low reverse clutch
12. Direct clutch
8
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
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
AT-64
TROUBLE DIAGNOSIS
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
12
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
No.
Items
Symptom
Condition
Diagnostic Item
Reference
page
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