Nissan Silvia. Manual — part 13
SAT514G
5.
Start engine, apply foot brake, and place selector lever in “D”
position.
6.
Accelerate to wide open throttle gradually while applying foot
brake.
7.
Quickly note the engine stall revolution and immediately
release throttle.
I
During test, never hold throttle wide open for more than 5
seconds.
Stall revolution:
2,725 - 2,975 rpm
SAT786J
8.
Move selector lever to “N” position.
9.
Cool off ATF.
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Run engine at idle for at least one minute.
10. Repeat steps 5 through 9 with selector lever in “2”, “1” and “R”
positions.
JUDGEMENT OF STALL TEST
NMAT0022S02
The test result and possible damaged components relating to each
result are shown in the illustration. In order to pinpoint the possible
damaged components, follow the WORK FLOW shown in AT-46.
NOTE:
Stall revolution is too high in “D” or “2” position:
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Slippage occurs in 1st gear but not in 2nd and 3rd gears. . .
Low one-way clutch slippage
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Slippage occurs at the following gears:
1st through 3rd gears in “D” position and engine brake func-
tions.
1st and 2nd gears in “2” position and engine brake functions
with accelerator pedal released (fully closed throttle). . . For-
ward clutch or forward one-way clutch slippage
Stall revolution is too high in “R” position:
I
Engine brake does not function in “1” position. . . Low &
reverse brake slippage
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Engine brake functions in “1” position. . . Reverse clutch slip-
page
Stall revolution within specifications:
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Vehicle does not achieve speed of more than 80 km/h (50
MPH). . . One-way clutch seizure in torque converter housing
CAUTION:
Be careful since automatic fluid temperature increases abnor-
mally.
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Slippage occurs in 3rd and 4th gears in “D” position. . . High
clutch slippage
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Slippage occurs in 2nd and 4th gear in “D” position. . . Brake
band slippage
Stall revolution less than specifications:
I
Poor acceleration during starts. . . One-way clutch seizure in
torque converter
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Stall Test (Cont’d)
AT-49
SAT392H
TROUBLE DIAGNOSIS — BASIC INSPECTION
Stall Test (Cont’d)
AT-50
SAT209GA
Line Pressure Test
NMAT0023
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Location of line pressure test ports.
I
Always replace line pressure plugs as they are self-seal-
ing bolts.
SAT647B
LINE PRESSURE TEST PROCEDURE
NMAT0023S01
1.
Check A/T fluid and engine oil levels. If necessary, add fluid
and oil.
2.
Drive vehicle for approx. 10 minutes or until fluid and oil reach
operating temperature.
ATF operating temperature:
50 - 80°C (122 - 176°F)
SAT518GA
SAT519GA
3.
Install pressure gauge to corresponding line pressure port.
SAT513G
4.
Set parking brake and block wheels.
I
Continue to depress brake pedal fully while line pressure
test is being performed at stall speed.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Line Pressure Test
AT-51
SAT493G
5.
Start engine and measure line pressure at idle and stall speed.
I
When measuring line pressure at stall speed, follow the
stall test procedure.
Line pressure:
Refer to SDS, AT-288.
JUDGEMENT OF LINE PRESSURE TEST
NMAT0023S02
Judgement
Suspected parts
At idle
Line pressure is low in all posi-
tions.
I
Oil pump wear
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Control piston damage
I
Pressure regulator valve or plug sticking
I
Spring for pressure regulator valve damaged
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Fluid pressure leakage between oil strainer and pressure regulator valve
I
Clogged strainer
Line pressure is low in particu-
lar position.
I
Fluid pressure leakage between manual valve and particular clutch
I
For example, line pressure is:
— Low in “R” and “1” positions, but
— Normal in “D” and “2” positions.
Then, fluid leakage exists at or around low and reverse brake circuit.
Refer to “CLUTCH AND BAND CHART”, AT-16.
Line pressure is high.
I
Mal-adjustment of throttle position sensor
I
Fluid temperature sensor damaged
I
Line pressure solenoid valve sticking
I
Short circuit of line pressure solenoid valve circuit
I
Pressure modifier valve sticking
I
Pressure regulator valve or plug sticking
I
Open in dropping resistor circuit
At stall speed
Line pressure is low.
I
Mal-adjustment of throttle position sensor
I
Line pressure solenoid valve sticking
I
Short circuit of line pressure solenoid valve circuit
I
Pressure regulator valve or plug sticking
I
Pressure modifier valve sticking
I
Pilot valve sticking
SAT786A
Road Test
NMAT0024
DESCRIPTION
NMAT0024S01
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The purpose of the test is to determine overall performance of
A/T and analyze causes of problems.
I
The road test consists of the following three parts:
1.
Check before engine is started
2.
Check at idle
3.
Cruise test
TROUBLE DIAGNOSIS — BASIC INSPECTION
Line Pressure Test (Cont’d)
AT-52
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