Infiniti QX4 (R50). Manual — part 63
14. Lock-up Is Not Released
=NBAT0086
SYMPTOM:
Lock-up is not released when accelerator pedal is released.
1
CHECK THROTTLE POSITION SWITCH CIRCUIT
With CONSULT-II
Does “TCM INPUT SIGNALS” in Data Monitor show damage to closed throttle position switch circuit?
Without CONSULT-II
Does self-diagnosis show damage to closed throttle position switch circuit?
SAT367J
Yes or No
Yes
©
Check closed throttle position switch circuit. Refer to “DTC P1705”, AT-176.
No
©
GO TO 2.
2
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
14. Lock-up Is Not Released
AT-249
15. Engine Speed Does Not Return To Idle
(Light Braking D
4
→
D
3
)
=NBAT0087
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.
1
CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to overrun clutch solenoid valve circuit after cruise test?
SAT583I
Yes or No
Yes
©
Check overrun clutch solenoid valve circuit. Refer to “DTC P1760”, AT-185.
No
©
GO TO 2.
2
CHECK THROTTLE POSITION SENSOR
Check throttle position sensor. Refer to EC-174, “Description”.
SAT142K
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace throttle position sensor.
TROUBLE DIAGNOSES FOR SYMPTOMS
15. Engine Speed Does Not Return To Idle (Light Braking D
4
→
D
3
)
AT-250
3
CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
SAT171B
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 6.
4
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-273.
2. Check the following items:
I
Overrun clutch control valve
I
Overrun clutch reducing valve
I
Overrun clutch solenoid valve
OK or NG
OK
©
GO TO 5.
NG
©
Repair or replace damaged parts.
5
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
6
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-273.
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
OK or NG
OK
©
GO TO 5.
NG
©
Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
15. Engine Speed Does Not Return To Idle (Light Braking D
4
→
D
3
) (Cont’d)
AT-251
16. Vehicle Does Not Start From D
1
NBAT0088
SYMPTOM:
Vehicle does not start from D
1
on Cruise test — Part 2.
1
CHECK SELF-DIAGNOSTIC RESULTS
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?
SAT686I
Yes or No
Yes
©
Check damaged circuit. Refer to “DTC P0720, P0750, P0755 or VHCL SPEED
SEN·MTR”, AT-111, 176, or 197.
No
©
GO TO 2.
2
CHECK SYMPTOM
Check again.
OK or NG
OK
©
Go to “8. Vehicle Cannot Be Started From D
1
”, AT-233.
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
TROUBLE DIAGNOSES FOR SYMPTOMS
16. Vehicle Does Not Start From D
1
AT-252
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