Infiniti I35 (A33). Manual — part 22
4
CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT678K
Yes or No
Yes
©
GO TO 5.
No
©
Mark the box of “Engine Speed Does Not Return To Idle (Light Braking D
4
,
D
3
)” on the
DIAGNOSTIC WORKSHEET. Continue ROAD TEST.
5
CHECK SHIFT DOWN (2
2
TO 1
1
)
1. Move selector lever from 2nd to 1st position while driving in 2
2
.
2. Does A/T shift from 2
2
to 1
1
position?
Read gear position.
SAT514K
Yes or No
Yes
©
GO TO 6.
No
©
Mark the box of “A/T Does Not Shift: 2
2
,
1
1
, When Selector Lever 2nd
,
1st Position”
on the DIAGNOSTIC WORKSHEET. Continue ROAD TEST.
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-85
6
CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT514K
Yes or No
Yes
©
1. Stop vehicle.
2. Perform self-diagnosis. Refer to TCM Self-diagnostic Procedure (No Tools), AT-52.
No
©
Mark the box of “Vehicle Does Not Decelerate By Engine Brake” on the DIAGNOSTIC
WORKSHEET. Stop ROAD TEST.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-86
Symptom Chart
NHAT0030
Numbers are arranged in order of inspection.
Perform inspections starting with number one and work up.
Items
Symptom
Condition
Diagnostic Item
Reference Page
No Lock-up
Engagement/TCC
Inoperative
Torque converter
is not locked up.
ON vehicle
1. Accelerator pedal position sensor
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Engine speed signal
4. A/T fluid temperature sensor
5. Line pressure test
6. Torque converter clutch solenoid valve
7. Control valve assembly
OFF vehicle
8. Torque converter
Torque converter
clutch piston slip.
ON vehicle
1. Fluid level
2. Accelerator pedal position sensor
3. Line pressure test
4. Torque converter clutch solenoid valve
5. Line pressure solenoid valve
6. Control valve assembly
OFF vehicle
7. Torque converter
Lock-up point is
extremely high or
low.
AT-249
ON vehicle
1. Accelerator pedal position sensor
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Torque converter clutch solenoid valve
4. Control valve assembly
Shift Shock
Sharp shock in
shifting from N to
D position.
ON vehicle
1. Engine idling rpm
2. Accelerator pedal position sensor
3. Line pressure test
4. A/T fluid temperature sensor
5. Engine speed signal
6. Line pressure solenoid valve
7. Control valve assembly
8. Accumulator N-D
OFF vehicle
9. Forward clutch
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart
AT-87
Items
Symptom
Condition
Diagnostic Item
Reference Page
Shift Shock
Too sharp a
shock in change
from D
1
to D
2
.
ON vehicle
1. Accelerator pedal position sensor
2. Line pressure test
3. Accumulator servo release
4. Control valve assembly
5. A/T fluid temperature sensor
OFF vehicle
6. Brake band
Too sharp a
shock in change
from D
2
to D
3
.
ON vehicle
1. Accelerator pedal position sensor
2. Line pressure test
3. Control valve assembly
4. A/T fluid temperature sensor
OFF vehicle
5. High clutch
6. Brake band
Too sharp a
shock in change
from D
3
to D
4
.
ON vehicle
1. Accelerator pedal position sensor
2. Line pressure test
3. Control valve assembly
4. A/F fluid temperature sensor
OFF vehicle
5. Brake band
6. Overrun clutch
7. Forward one-way clutch
Gear change
shock felt during
deceleration by
releasing accel-
erator pedal.
ON vehicle
1. Accelerator pedal position sensor
2. Line pressure test
3. Overrun clutch solenoid valve
4. Control valve assembly
Large shock
changing from 1
2
to 1
1
in 1st posi-
tion.
ON vehicle
1. Control valve assembly
OFF vehicle
2. Low & reverse brake
Improper Shift
Timing
Too high a gear
change point from
D
1
to D
2
, from D
2
to D
3
, from D
3
to
D
4
.
ON vehicle
1. Accelerator pedal position sensor
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Shift solenoid valve A
4. Shift solenoid valve B
Gear change
directly from D
1
to
D
3
occurs.
ON vehicle
1. Fluid level
2. Accumulator servo release
OFF vehicle
3. Brake band
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-88
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