Infiniti Q45 (FY33). Manual — part 44
SAT582I
13. A/T Does Not Hold Lock-up Condition
SYMPTOM:
A/T does not hold lock-up condition for more than 30 seconds.
SAT171B
Does self-diagnosis show damage to
engine speed signal circuit after cruise
test?
No
E
Yes
Check engine speed signal
circuit. Refer to “DTC
P0725”, AT-92.
1. Remove oil pan.
2. Check A/T fluid condition.
OK
E
NG
1. Remove control valve
assembly. Refer to
AT-195.
2. Check the following
items:
I
Torque converter clutch
control valve
I
Pilot valve
I
Pilot filter
3. Disassemble A/T.
4. Check torque converter
and oil pump assembly.
1. Remove control valve assembly. Refer
to AT-195.
2. Check the following items:
I
Torque converter clutch control valve
I
Pilot valve
I
Pilot filter
OK
OK
F
Check again.
OK
E
NG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
SAT367J
14. Lock-up Is Not Released
SYMPTOM:
Lock-up is not released when accelerator pedal is released.
Does “TCM INPUT SIGNALS” in
“DATA MONITOR” show damage to
closed throttle position switch cir-
cuit?
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
Does self-diagnosis show damage
to closed throttle position switch
circuit?
No
E
Yes
Check closed throttle posi-
tion switch circuit. Refer to
“DTC P1705”, AT-137.
Check again.
OK
E
NG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
H
H
H
H
H
H
H
AT-173
SAT583I
15. Engine Speed Does Not Return To Idle
(Light Braking D
4
→
D
3
)
SYMPTOM:
I
Engine speed does not smoothly return to idle when A/T
shifts from D
4
to D
3
.
I
Vehicle does not decelerate by engine brake when turning
overdrive control switch OFF.
I
Vehicle does not decelerate by engine brake when shifting
A/T from “D” to “2” position.
SAT559I
SAT171B
Does self-diagnosis show damage to
overrun clutch solenoid valve circuit after
cruise test?
No
E
Yes
Check overrun clutch sole-
noid valve circuit. Refer to
“DTC P1760”, AT-143.
Check throttle position sensor. Refer to
EC section [“Throttle Position Sensor
(DTC: 0403)”, “TROUBLE DIAGNOSIS
FOR DTC P0120”].
OK
E
NG
Repair or replace throttle
position sensor.
1. Remove oil pan.
2. Check A/T fluid condition.
OK
E
NG
1. Remove control valve
assembly. Refer to
AT-195.
2. Check the following
items:
I
Overrun clutch control
valve
I
Overrun clutch reducing
valve
I
Overrun clutch solenoid
valve
3. Disassemble A/T.
4. Check the following
items:
I
Overrun clutch assembly
I
Oil pump assembly
1. Remove control valve assembly. Refer
to AT-195.
2. Check the following items:
I
Overrun clutch control valve
I
Overrun clutch reducing valve
I
Overrun clutch solenoid valve
OK
OK
F
Check again.
OK
E
NG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
TROUBLE DIAGNOSES FOR SYMPTOMS
H
H
H
H
H
H
AT-174
SAT686I
16. Vehicle Does Not Start From D
1
SYMPTOM:
Vehicle does not start from D
1
on Cruise test — Part 2.
Does self-diagnosis show damage to
vehicle speed sensor
⋅
A/T (revolution
sensor), shift solenoid valve A, B or
vehicle speed sensor
⋅
MTR after cruise
test?
No
E
Yes
Check damaged circuit.
Refer to “DTC P0720,
P0750, P0755 or VHCL
SPEED SEN
⋅
MTR”, AT-89,
Check again.
OK
E
NG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
Go to 8. Vehicle Cannot Be Started From
D
1
, AT-168.
SAT146BA
17. A/T Does Not Shift: D
4
→
D
3
, When
Overdrive Control Switch “ON”
→
“OFF”
SYMPTOM:
A/T does not shift from D
4
to D
3
when changing overdrive
control switch to “OFF” position.
Does “TCM INPUT SIGNALS” in
“DATA MONITOR” show damage
to overdrive control switch circuit?
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
Does self-diagnosis show damage
to overdrive control switch circuit?
No
E
Yes
Check overdrive control
switch circuit. Refer to
AT-177.
Go to 10. A/T Does Not Shift: D
2
,
D
3
,
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
H
H
H
H
AT-175
SAT367J
18. A/T Does Not Shift: D
3
→
2
2
, When Selector
Lever “D”
→
“2” Position
SYMPTOM:
A/T does not shift from D
3
to 2
2
when changing selector lever
from “D” to “2” position.
Does “TCM INPUT SIGNALS” in
“DATA MONITOR” show damage
to PNP switch circuit?
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
Does self-diagnosis show damage
to PNP switch circuit?
No
E
Yes
Check PNP switch circuit.
Refer to “FOR DTC
P0705”, AT-81.
Go to 9. A/T Does Not Shift: D
1
,
D
2
Or
Does Not Kickdown: D
4
,
D
2
, AT-169.
SAT367J
19. A/T Does Not Shift: 2
2
→
1
1
, When Selector
Lever “2”
→
“1” Position
SYMPTOM:
A/T does not shift from 2
2
to 1
1
when changing selector lever
from “2” to “1” position.
SAT778B
Does “TCM INPUT SIGNALS” in
“DATA MONITOR” show damage
to PNP switch circuit?
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
Does self-diagnosis show damage
to PNP switch circuit?
No
E
Yes
Check PNP switch circuit.
Refer to “DTC P0705”,
AT-81.
Check again.
OK
E
NG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
TROUBLE DIAGNOSES FOR SYMPTOMS
H
H
H
AT-176
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