Infiniti F50. Manual — part 45
TROUBLE DIAGNOSIS
AT-65
D
E
F
G
H
I
J
K
L
M
A
B
AT
When D or M posi-
tion, remains in 2nd
gear.
ON vehicle
1. 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 assembly
OFF vehicle
7. 3rd one-way clutch (ATF condition “NG” only. Refer to
.)
8. Gear system (ATF condition “NG” only. Refer to
.)
9. Direct clutch (ATF condition “NG” only. Refer to
.)
10. Forward brake* (ATF condition “NG” only. Refer to
When D or M posi-
tion, remains in 3rd
gear.
ON vehicle
1. 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 assembly
OFF vehicle
6. 3rd one-way clutch (ATF condition “NG” only. Refer to
.)
7. Gear system (ATF condition “NG” only. Refer to
.)
8. High and low reverse clutch (ATF condition “NG” only. Refer to
.)
9. Forward one-way clutch* (ATF condition “NG” only. Refer to
.)
10. Forward brake* (ATF condition “NG” only. Refer to
When D or M posi-
tion, remains in 4th
gear.
ON vehicle
1. 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 and high and low reverse clutch solenoid valve
6. Low coast brake solenoid valve
7. Front brake solenoid valve
8. Line pressure test
9. CAN communication line
10. Control valve assembly
OFF vehicle
11. Input clutch (ATF condition “NG” only. Refer to
.)
12. Gear system (ATF condition “NG” only. Refer to
.)
13. High and low reverse clutch (ATF condition “NG” only. Refer to
.)
14. Direct clutch (ATF condition “NG” only. Refer to
.)
Symptom
Condition
Diagnostic Item
Reference page
AT-66
TROUBLE DIAGNOSIS
When D or M posi-
tion, remains in 5th
gear.
ON vehicle
1. 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 assembly
OFF vehicle
7. Front brake [brake band (ATF condition “NG” only. Refer to
.)]
8. Input clutch (ATF condition “NG” only. Refer to
9. Gear system (ATF condition “NG” only. Refer to
10. High and low reverse clutch (ATF condition “NG” only. Refer to
Vehicle cannot be
started from D
1
.
"Vehicle Cannot Be
Started From D
ON vehicle
1. Fluid level and state
2. Accelerator pedal position sensor
3. Line pressure test
4. CAN communication line
5. Control valve assembly
OFF vehicle
6. Torque converter (ATF condition “NG” only. Refer to
.)
7. Oil pump assembly (ATF condition “NG” only. Refer to
.)
8. 3rd one-way clutch (ATF condition “NG” only. Refer to
.)
9. 1st one-way clutch (ATF condition “NG” only. Refer to
.)
10. Gear system (ATF condition “NG” only. Refer to
11. Reverse brake (ATF condition “NG” only. Refer to
12. Forward one-way clutch* (ATF condition “NG” only. Refer to
13. Forward brake* (ATF condition “NG” only. Refer to
.)
Gear does not
change from D
1
→
D
2
or from M
1
→
M
2
.
Refer to
ON vehicle
1. 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 assembly
OFF vehicle
7. Direct clutch (ATF condition “NG” only. Refer to
Symptom
Condition
Diagnostic Item
Reference page
TROUBLE DIAGNOSIS
AT-67
D
E
F
G
H
I
J
K
L
M
A
B
AT
Gear does not
change from D
2
→
D
3
or from M
2
→
M
3
.
Refer to
ON vehicle
1. Fluid level and state
2. Vehicle speed sensor A/T and vehicle speed sensor MTR
,
3. ATF pressure switch 6 and high and low reverse clutch solenoid valve
4. Line pressure test
5. CAN communication line
6. Control valve assembly
OFF vehicle
7. High and low reverse clutch (ATF condition “NG” only. Refer to
.)
Gear does not
change from D
3
→
D
4
or from M
3
→
M
4
.
Refer to
ON vehicle
1. 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 assembly
OFF vehicle
8. Input clutch (ATF condition “NG” only. Refer to
.)
Gear does not
change from D
4
→
D
5
or from M
4
→
M
5
.
Refer to
ON vehicle
1. 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 assembly
OFF vehicle
9. Front brake [brake band (ATF condition “NG” only. Refer to
.)]
10. Input clutch (ATF condition “NG” only. Refer to
.)
In D or M range,
does not downshift
to 4th gear.
Refer to
ON vehicle
1. 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 assembly
OFF vehicle
8. Front brake [brake band (ATF condition “NG” only. Refer to
.)]
9. Input clutch (ATF condition “NG” only. Refer to
.)
Symptom
Condition
Diagnostic Item
Reference page
AT-68
TROUBLE DIAGNOSIS
In D or M range,
does not downshift
to 3rd gear.
Refer to
ON vehicle
1. 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 assembly
OFF vehicle
8. Input clutch (ATF condition “NG” only. Refer to
In D or M range,
does not downshift
to 2nd gear.
Refer to
ON vehicle
1. Fluid level and state
2. Vehicle speed sensor A/T and vehicle speed sensor MTR
,
3. ATF pressure switch 6 and high and low reverse clutch solenoid valve
,
4. CAN communication line
5. Line pressure test
6. Control valve assembly
OFF vehicle
7. High and low reverse clutch (ATF condition “NG” only. Refer to
In D or M range,
does not downshift
to 1st gear.
Refer to
ON vehicle
1. 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 assembly
OFF vehicle
7. Direct clutch (ATF condition “NG” only. Refer to
Does not lock-up.
Refer to
.
ON vehicle
1. 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 assembly
OFF vehicle
8. Torque converter (ATF condition “NG” only. Refer to
.)
9. Oil pump assembly (ATF condition “NG” only. Refer to
.)
Does not hold lock-
up condition.
Refer to
T Does Not Hold
Lock-up Condition"
.
ON vehicle
1. 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 assembly
OFF vehicle
8. Torque converter (ATF condition “NG” only. Refer to
.)
9. Oil pump assembly (ATF condition “NG” only. Refer to
.)
Symptom
Condition
Diagnostic Item
Reference page
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