Nissan Silvia. Instruction — part 18
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. Instruction control linkage adjustment
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-72
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