Nissan 240SX — Automatic Transmission (Section AT) (2000 year). Manual — part 5
3
CHECK SHIFT UP (D
2
TO D
3
)
Does A/T shift from D
2
to D
3
at the specified speed?
Read gear position, throttle position and vehicle speed.
Specified speed when shifting from D
2
to D
3
:
Refer to Shift schedule, AT-288.
SAT960I
Yes or No
Yes
©
GO TO 4.
No
©
Go to “13. A/T Does Not Shift: D
2
,
D
3
”, AT-171.
4
CHECK SHIFT UP (D
3
TO D
4
) AND ENGINE BRAKE
Release accelerator pedal after shifting from D
2
to D
3
.
Does A/T shift from D
3
to D
4
and does vehicle decelerate by engine brake?
Read gear position, throttle position and vehicle speed.
SAT405H
Yes or No
Yes
©
1. Stop vehicle.
2. Go to “Cruise test — Part 3”, AT-66.
No
©
Go to “14. A/T Does Not Shift: D
3
,
D
4
”, AT-174.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-65
Cruise Test — Part 3
=NMAT0024S0406
1
VEHICLE SPEED D
4
POSITION
1. Confirm overdrive control switch is in “ON” position.
2. Confirm selector lever is in “D” position.
3. Accelerate vehicle using half-throttle to D
4
.
SAT812A
©
GO TO 2.
2
CHECK SHIFT DOWN (D
4
TO D
3
)
1. Release accelerator pedal.
2. Set overdrive control switch to “OFF” position while driving in D
4
.
3. Does A/T shift from D
4
to D
3
(O/D OFF)?
Read gear position and vehicle speed.
SAT410K
Yes or No
Yes
©
GO TO 3.
No
©
Go to “20. A/T Does Not Shift: D
4
,
D
3
, When Overdrive Control Switch “ON”
,
“OFF”,
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-66
3
CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT410K
Yes or No
Yes
©
GO TO 4.
No
©
Go to “18. Engine Speed Does Not Return To Idle (Light Braking D
4
,
D
3
)”, AT-182.
4
CHECK SHIFT DOWN (D
3
TO D
2
)
1. Move selector lever from “D” to “2” position while driving in D
3
(O/D OFF).
2. Does A/T shift from D
3
(O/D OFF) to 2
2
?
Read gear position.
SAT411K
Yes or No
Yes
©
GO TO 5.
No
©
Go to “21. A/T Does Not Shift: D
3
,
D
2
, When Selector Lever “D”
,
“2” Position”,
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-67
5
CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT411K
Yes or No
Yes
©
GO TO 6.
No
©
Go to “18. Engine Speed Does Not Return To Idle (Light Braking D
4
,
D
3
)”, AT-182.
6
CHECK SHIFT DOWN (2
2
TO 1
1
)
1. Move selector lever from “2” to “1” position while driving in 2
2
.
2. Does A/T shift from 2
2
to 1
1
position?
SAT412K
Yes or No
Yes
©
GO TO 7.
No
©
Go to “22. A/T Does Not Shift: 2
2
,
1
1
, When Selector lever “2”
,
“1” Position”, AT-187.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-68
7
CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT412K
Yes or No
Yes
©
1. Stop vehicle.
2. Perform self-diagnosis. Refer to SELF-DIAGNOSTIC PROCEDURE (Without
CONSULT-II), AT-37.
No
©
Go to “23. Vehicle Does Not Decelerate By Engine Brake”, AT-188.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-69
Symptom Chart
NMAT0256
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. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Park/neutral position (PNP) switch
adjustment
4. Engine speed signal
5. A/T fluid temperature sensor
6. Line pressure test
7. Torque converter clutch solenoid valve
8. Control valve assembly
OFF vehicle
9. Torque converter
Torque converter
clutch piston slip.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
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-177
ON vehicle
1. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
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
EC-50, “Basic Inspec-
tion”.
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
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
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart
AT-70
Items
Symptom
Condition
Diagnostic Item
Reference Page
Shift Shock
Too sharp a
shock in change
from D
1
to D
2
.
ON vehicle
1. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
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. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
2. Line pressure test
3. Control valve assembly
OFF vehicle
4. High clutch
5. Brake band
Too sharp a
shock in change
from D
3
to D
4
.
ON vehicle
1. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
2. Line pressure test
3. Control valve assembly
OFF vehicle
4. Brake band
5. Overrun clutch
Gear change
shock felt during
deceleration by
releasing accel-
erator pedal.
ON vehicle
1. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
2. Line pressure test
3. Overrun clutch solenoid valve
4. Control valve assembly
Large shock
changing from 1
2
to 1
1
in 1 position.
ON vehicle
1. Control valve assembly
ON vehicle
2. Low & reverse brake
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-71
Items
Symptom
Condition
Diagnostic Item
Reference Page
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. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
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
Too high a
change point from
D
4
to D
3
, from D
3
to D
2
, from D
2
to
D
1
.
ON vehicle
1. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
Kickdown does
not operate when
depressing pedal
in D
4
within kick-
down vehicle
speed.
ON vehicle
1. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Shift solenoid valve A
4. Shift solenoid valve B
Kickdown oper-
ates or engine
overruns when
depressing pedal
in D
4
beyond kick-
down vehicle
speed limit.
ON vehicle
1. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Shift solenoid valve A
4. Shift solenoid valve B
Gear change from
2
2
to 2
3
in 2 posi-
tion.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
Gear change from
1
1
to 1
2
in 1 posi-
tion.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Manual control linkage adjustment
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-72
Items
Symptom
Condition
Diagnostic Item
Reference Page
No Down Shift
Failure to change
gear from D
4
to
D
3
.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Overrun clutch solenoid valve
4. Shift solenoid valve A
5. Line pressure solenoid valve
6. Control valve assembly
OFF vehicle
7. Low & reverse brake
8. Overrun clutch
Failure to change
gear from D
3
to
D
2
or from D
4
to
D
2
.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Shift solenoid valve A
4. Shift solenoid valve B
5. Control valve assembly
OFF vehicle
6. High clutch
7. Brake band
Failure to change
gear from D
2
to
D
1
or from D
3
to
D
1
.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Shift solenoid valve A
4. Shift solenoid valve B
5. Control valve assembly
OFF vehicle
6. Low one-way clutch
7. High clutch
8. Brake band
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-73
Items
Symptom
Condition
Diagnostic Item
Reference Page
No Down Shift
Failure to change
from D
3
to 2
2
when changing
lever into 2 posi-
tion.
AT-182
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Overrun clutch solenoid valve
4. Shift solenoid valve B
5. Shift solenoid valve A
6. Control valve assembly
7. Manual control linkage adjustment
OFF vehicle
8. Brake band
9. Overrun clutch
Does not change
from 1
2
to 1
1
in 1
position.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Shift solenoid valve A
4. Control valve assembly
5. Overrun clutch solenoid valve
OFF vehicle
6. Overrun clutch
7. Low & reverse brake
No Up Shift
Failure to change
gear from D
1
to
D
2
.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Manual control linkage adjustment
3. Shift solenoid valve A
4. Control valve assembly
5. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
OFF vehicle
6. Brake band
Failure to change
gear from D
2
to
D
3
.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Manual control linkage adjustment
3. Shift solenoid valve B
4. Control valve assembly
5. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
OFF vehicle
6. High clutch
7. Brake band
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-74
Items
Symptom
Condition
Diagnostic Item
Reference Page
No Up Shift
Failure to change
gear from D
3
to
D
4
.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Manual control linkage adjustment
3. Shift solenoid valve A
4. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
5. A/T fluid temperature sensor
OFF vehicle
6. Brake band
A/T does not shift
to D
4
when driv-
ing with overdrive
control switch ON.
ON vehicle
1. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
2. Park/neutral position (PNP) switch
adjustment
3. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
4. Shift solenoid valve A
5. Overrun clutch solenoid valve
6. Control valve assembly
7. A/T fluid temperature sensor
8. Line pressure solenoid valve
OFF vehicle
9. Brake band
10. Overrun clutch
Slips/Will Not
Engage
Vehicle will not
run in R position
(but runs in D, 2
and 1 positions).
Clutch slips.
Very poor accel-
eration.
AT-159
ON vehicle
1. Manual control linkage adjustment
2. Line pressure test
3. Line pressure solenoid valve
4. Control valve assembly
OFF vehicle
5. Reverse clutch
6. High clutch
7. Forward clutch
8. Overrun clutch
9. Low & reverse brake
Vehicle will not
run in D and 2
positions (but
runs in 1 and R
positions).
ON vehicle
1. Manual control linkage adjustment
OFF vehicle
2. Low one-way clutch
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-75
Items
Symptom
Condition
Diagnostic Item
Reference Page
Slips/Will Not
Engage
Vehicle will not
run in D, 1, 2
positions (but
runs in R posi-
tion). Clutch slips.
Very poor accel-
eration.
AT-162
ON vehicle
1. Fluid level
2. Line pressure test
3. Line pressure solenoid valve
4. Control valve assembly
5. Accumulator N-D
OFF vehicle
6. Reverse clutch
7. High clutch
8. Forward clutch
9. Forward one-way clutch
10. Low one-way clutch
Clutches or
brakes slip some-
what in starting.
ON vehicle
1. Fluid level
2. Manual control linkage adjustment
3. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
4. Line pressure test
5. Line pressure solenoid valve
6. Control valve assembly
7. Accumulator N-D
OFF vehicle
8. Forward clutch
9. Reverse clutch
10. Low & reverse brake
11. Oil pump
12. Torque converter
ON vehicle
1. Fluid level
2. Line pressure test
3. Control valve assembly
OFF vehicle
4. Forward clutch
5. Oil pump
6. Torque converter
Almost no shock
or clutches slip-
ping in change
from D
1
to D
2
.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Line pressure test
4. Accumulator servo release
5. Control valve assembly
OFF vehicle
6. Brake band
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-76
Items
Symptom
Condition
Diagnostic Item
Reference Page
Slips/Will Not
Engage
Almost no shock
or slipping in
change from D
2
to
D
3
.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Line pressure test
4. Control valve assembly
OFF vehicle
5. High clutch
6. Forward clutch
Almost no shock
or slipping in
change from D
3
to
D
4
.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Line pressure test
4. Control valve assembly
OFF vehicle
5. High clutch
6. Brake band
Races extremely
fast or slips in
changing from D
4
to D
3
when
depressing pedal.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
OFF vehicle
6. High clutch
7. Forward clutch
Races extremely
fast or slips in
changing from D
4
to D
2
when
depressing pedal.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Line pressure test
4. Line pressure solenoid valve
5. Shift solenoid valve A
6. Control valve assembly
OFF vehicle
7. Brake band
8. Forward clutch
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-77
Items
Symptom
Condition
Diagnostic Item
Reference Page
Slips/Will Not
Engage
Races extremely
fast or slips in
changing from D
3
to D
2
when
depressing pedal.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
6. A/T fluid temperature sensor
OFF vehicle
7. Brake band
8. Forward clutch
9. High clutch
Races extremely
fast or slips in
changing from D
4
or D
3
to D
1
when
depressing pedal.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
OFF vehicle
6. Forward clutch
7. Forward one-way clutch
8. Low one-way clutch
Vehicle will not
run in any posi-
tion.
ON vehicle
1. Fluid level
2. Manual control linkage adjustment
3. Line pressure test
4. Line pressure solenoid valve
OFF vehicle
5. Oil pump
6. High clutch
7. Brake band
8. Low & reverse brake
9. Torque converter
10. Parking pawl components
NOT USED
Engine cannot be
started in P and N
positions.
AT-153
ON vehicle
1. Ignition switch and starter
EL-7, “Schematic”,
and SC-12, “System
Description”.
2. Manual control linkage adjustment
3. Park/neutral position (PNP) switch
adjustment
Engine starts in
positions other
than P and N.
AT-153
ON vehicle
1. Manual control linkage adjustment
2. Park/neutral position (PNP) switch
adjustment
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-78
Items
Symptom
Condition
Diagnostic Item
Reference Page
NOT USED
Transmission
noise in P and N
positions.
ON vehicle
1. Fluid level
2. Line pressure test
3. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
4. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
5. Engine speed signal
OFF vehicle
6. Oil pump
7. Torque converter
Vehicle moves
when changing
into P position or
parking gear does
not disengage
when shifted out
of P position.
AT-154
ON vehicle
1. Manual control linkage adjustment
OFF vehicle
2. Parking pawl components
Vehicle runs in N
position.
AT-155
ON vehicle
1. Manual control linkage adjustment
OFF vehicle
2. Forward clutch
3. Reverse clutch
4. Overrun clutch
Vehicle braked
when shifting into
R position.
ON vehicle
1. Fluid level
2. Manual control linkage adjustment
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
OFF vehicle
6. High clutch
7. Brake band
8. Forward clutch
9. Overrun clutch
Excessive creep.
ON vehicle
1. Engine idling rpm
EC-50, “Basic Inspec-
tion”.
Engine stops
when shifting
lever into R, D, 2
and 1.
ON vehicle
1. Engine idling rpm
EC-50, “Basic Inspec-
tion”.
2. Torque converter clutch solenoid valve
3. Control valve assembly
OFF vehicle
4. Torque converter
Vehicle braked by
gear change from
D
1
to D
2
.
ON vehicle
1. Fluid level
OFF vehicle
2. Reverse clutch
3. Low & reverse brake
4. High clutch
5. Low one-way clutch
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-79
Items
Symptom
Condition
Diagnostic Item
Reference Page
NOT USED
Vehicle braked by
gear change from
D
2
to D
3
.
ON vehicle
1. Fluid level
OFF vehicle
2. Brake band
Vehicle braked by
gear change from
D
3
to D
4
.
ON vehicle
1. Fluid level
OFF vehicle
2. Overrun clutch
3. Forward one-way clutch
4. Reverse clutch
Maximum speed
not attained.
Acceleration poor.
ON vehicle
1. Fluid level
2. Park/neutral position (PNP) switch
adjustment
3. Shift solenoid valve A
4. Shift solenoid valve B
5. Control valve assembly
OFF vehicle
6. Reverse clutch
7. High clutch
8. Brake band
9. Low & reverse brake
10. Oil pump
11. Torque converter
Transmission
noise in D, 2, 1
and R positions.
ON vehicle
1. Fluid level
ON vehicle
2. Torque converter
Engine brake
does not operate
in “1” position.
AT-184
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Manual control linkage adjustment
3. Throttle position sensor (Adjustment)
EC-50, “Basic Inspec-
tion”.
4. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
5. Shift solenoid valve A
6. Control valve assembly
7. Overrun clutch solenoid valve
OFF vehicle
8. Overrun clutch
9. Low & reverse brake
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-80
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