Infiniti I35 (A33). Manual — part 64
Lock-up Is Not Released
=NHAT0101
SYMPTOM:
Lock-up is not released when accelerator pedal is released.
1
CHECK ACCELERATOR PEDAL POSITION SENSOR (THROTTLE POSITION SENSOR) CIRCUIT
With CONSULT-II
Does “TCM INPUT SIGNALS” in “DATA MONITOR” show damage to accelerator pedal position sensor (throttle position
sensor) circuit?
Without CONSULT-II
Does self-diagnosis show damage to accelerator pedal position sensor (throttle position sensor) circuit?
SAT555K
Yes or No
Yes
©
Check accelerator pedal position sensor (throttle position sensor) circuit. Refer to “DTC
P1705”, AT-188.
No
©
GO TO 2.
2
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 3.
3
CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
©
INSPECTION END
NG
©
Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
Lock-up Is Not Released
AT-253
Engine Speed Does Not Return To Idle (Light
Braking D
4
→
D
3
)
=NHAT0102
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
A/T selector lever D to 3rd position.
I
Vehicle does not decelerate by engine brake when shifting
A/T from D to 2nd position.
1
CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to overrun clutch solenoid valve circuit after cruise test?
SAT548K
Yes or No
Yes
©
Check overrun clutch solenoid valve circuit. Refer to “DTC P1760”, AT-195.
No
©
GO TO 2.
2
CHECK ACCELERATOR PEDAL POSITION SENSOR
Check accelerator pedal position sensor. Refer to AT-188, “DTC P1705”.
SAT516KB
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace accelerator pedal position sensor.
TROUBLE DIAGNOSES FOR SYMPTOMS
Engine Speed Does Not Return To Idle (Light Braking D
4
→
D
3
)
AT-254
3
CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
SAT171B
OK or NG
OK
©
GO TO 5.
NG
©
GO TO 4.
4
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-282.
2. Check the following items:
I
Overrun clutch control valve
I
Overrun clutch reducing valve
I
Overrun clutch solenoid valve
3. Disassemble A/T. Refer to AT-293.
4. Check the following item:
I
Overrun clutch assembly
OK or NG
OK
©
GO TO 6.
NG
©
Repair or replace damaged parts.
5
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-282.
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 6.
NG
©
Repair or replace damaged parts.
6
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 7.
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
Engine Speed Does Not Return To Idle (Light Braking D
4
→
D
3
) (Cont’d)
AT-255
7
CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
©
INSPECTION END
NG
©
Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
Engine Speed Does Not Return To Idle (Light Braking D
4
→
D
3
) (Cont’d)
AT-256
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