Nissan 240SX — Automatic Transmission (Section AT) (2000 year). Instruction — part 4
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.
I
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:
I
Slippage occurs in 1st gear but not in 2nd and 3rd gears. . .
Low one-way clutch slippage
I
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
I
Engine brake functions in “1” position. . . Reverse clutch slip-
page
Stall revolution within specifications:
I
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.
I
Slippage occurs in 3rd and 4th gears in “D” position. . . High
clutch slippage
I
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
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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
I
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.
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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
I
Control piston damage
I
Pressure regulator valve or plug sticking
I
Spring for pressure regulator valve damaged
I
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
I
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
SAT496G
I
Before road test, familiarize yourself with all test procedures
and items to check.
I
Conduct tests on all items until specified symptom is found.
Troubleshoot items which check out No Good after road test.
Refer to “ON BOARD DIAGNOSTIC SYSTEM DESCRIP-
TION” and “TROUBLE DIAGNOSES FOR SYMPTOMS”,
AT-32 - AT-41 and AT-146 - AT-189.
1. CHECK BEFORE ENGINE IS STARTED
NMAT0024S02
1
CHECK POWER INDICATOR LAMP STEP 1
1. Park vehicle on flat surface.
2. Move selector lever to “P” position.
3. Turn ignition switch to “OFF” position.
Wait at least 5 seconds.
4. Set A/T mode switch in “AUTO” position.
5. Set overdrive control switch in “ON” position.
6. Turn ignition switch to “ON” position. (Do not start engine.)
7. Does POWER indicator lamp come on for about 2 seconds?
SAT408K
Yes or No
Yes
©
GO TO 2.
No
©
Go to “1. POWER Indicator Lamp Does Not Come On”, AT-149.
2
CHECK POWER INDICATOR LAMP STEP 2
Does POWER indicator lamp flicker for about 8 seconds?
SAT408K
Yes or No
Yes
©
Perform self-diagnosis. Refer to SELF-DIAGNOSIS PROCEDURE (Without CONSULT-
II), AT-37.
No
©
GO TO 3.
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TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-53
3
CHECK NG ITEM
1. Turn ignition switch to “OFF” position.
2. Perform self-diagnosis and note NG items.
Refer to SELF-DIAGNOSIS PROCEDURE (Without CONSULT-II), AT-37.
©
Go to “2. Check at idle”, AT-55.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-54
2. CHECK AT IDLE
=NMAT0024S03
1
CHECK ENGINE START
1. Park vehicle on flat surface.
2. Turn ignition switch to “OFF” position.
3. Move selector lever to “P” or “N” position.
4. Turn ignition switch to start position.
5. Is engine started?
Yes or No
Yes
©
GO TO 2.
No
©
Go to “5. Engine Cannot Be Started In “P” and “N” Position”, AT-153.
2
CHECK ENGINE START
1. Turn ignition switch to “OFF” position.
2. Move selector lever to “D”, “1”, “2” or “R” position.
3. Turn ignition switch to start position.
4. Is engine started?
Yes or No
Yes
©
Go to “5. Engine Cannot Be Started In “P” and “N” Position”, AT-153.
No
©
GO TO 3.
3
CHECK VEHICLE MOVE
1. Turn ignition switch to “OFF” position.
2. Move selector lever to “P” position.
3. Release parking brake.
4. Push vehicle forward or backward.
5. Does vehicle move when it is pushed forward or backward?
SAT796A
Yes or No
Yes
©
Go to “6. In “P” Position, Vehicle Moves Forward Or Backward When Pushed”, AT-154.
No
©
GO TO 4.
4
CHECK VEHICLE MOVE
1. Apply parking brake.
2. Move selector lever to “N” position.
3. Turn ignition switch to “START” position and start engine.
4. Release parking brake.
5. Does vehicle move forward or backward?
Yes or No
Yes
©
Go to “7. In “N” Position, Vehicle Moves”, AT-155.
No
©
GO TO 5.
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TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-55
5
CHECK SHIFT SHOCK
1. Apply foot brake.
2. Move selector lever to “R” position.
3. Is there large shock when changing from “N” to “R” position?
SAT082J
Yes or No
Yes
©
Go to “8. Large Shock. “N”
,
“R” Position”, AT-157.
No
©
GO TO 6.
6
CHECK VEHICLE MOVE
1. Release foot brake for several seconds.
2. Does vehicle creep backward when foot brake is released?
Yes or No
Yes
©
GO TO 7.
No
©
Go to “9. Vehicle Does Not Creep Backward In “R” Position”, AT-159.
7
CHECK VEHICLE MOVE
1. Move selector lever to “D”, “2” and “1” position and check if vehicle creeps forward.
2. Does vehicle creep forward in all three positions?
Yes or No
Yes
©
Go to “3. Cruise test”, AT-56.
No
©
Go to “10. Vehicle Does Not Creep Forward In “D”, “2” Or “1” Position”, AT-162.
SAT601J
3. CRUISE TEST
NMAT0024S04
I
Check all items listed in Parts 1 through 3.
With CONSULT-II
NMAT0024S0401
I
Using CONSULT-II, conduct a cruise test and record the result.
I
Print the result and ensure that shifts and lock-ups take place
as per “Shift Schedule”.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-56
JAT409K
CONSULT-II Setting Procedure
NMAT0024S0402
1.
Turn ignition switch “OFF”.
2.
Connect “CONSULT-II” to Data link connector which is located
in instrument lower panel on driver side.
SAT586J
3.
Turn ignition switch “ON”.
4.
Touch “START”.
SAT014K
5.
Touch “A/T”.
SAT407K
6.
Touch “DATA MONITOR”.
SAT175K
7.
Touch “MAIN SIGNALS” or “TCM INPUT SIGNALS”.
8.
See “Numerical Display”, “Barchart Display” or “Line Graph
Display”.
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TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-57
SAT973J
9.
Touch “SETTING” to set recording condition (“AUTO TRIG” or
“MANU TRIG”) and touch “BACK”.
10. Touch “START”.
SAT134K
11. When performing cruise test, touch “RECORD”.
SAT135K
12. After finishing cruise test part 1, touch “STOP”.
SAT987J
SAT974J
13. Touch “STORE” and touch “BACK”.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-58
SAT975J
14. Touch “DISPLAY”.
15. Touch “PRINT” again.
16. Check the monitor data printed out.
17. Continue cruise test part 2 and 3.
SAT513JC
Without CONSULT-II
NMAT0024S0403
I
Throttle position sensor can be checked by voltage across
connector M26 terminal Nos. 41 (R/Y) and 42 (GY) of TCM.
Refer to “Wiring Diagram — AT — TPS”, AT-100.
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TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-59
Cruise Test — Part 1
=NMAT0024S0404
1
CHECK STARTING GEAR (D
1
) POSITION
1. Drive vehicle for approx. 10 minutes to warm engine oil and ATF up to operating temperature.
ATF operating temperature:
50 - 80°C (122 - 176°F)
2. Park vehicle on flat surface.
3. Set overdrive control switch to “ON” position.
4. Move selector lever to “P” position.
5. Start engine.
6. Move selector lever to “D” position.
7. Accelerate vehicle by constantly depressing accelerator pedal halfway.
SAT953I
8. Does vehicle start from D
1
?
Read gear position.
Yes or No
Yes
©
GO TO 2.
No
©
Go to “11. Vehicle Cannot Be Started From D
1
”, AT-165.
2
CHECK SHIFT UP (D
1
TO D
2
)
Does A/T shift from D
1
to D
2
at the specified speed?
Read gear position, throttle opening and vehicle speed.
Specified speed when shifting from D
1
to D
2
:
Refer to Shift schedule, AT-288.
SAT954I
Yes or No
Yes
©
GO TO 3.
No
©
Go to “12. A/T Does Not Shift: D
1
,
D
2
or Does Not Kickdown: D
4
,
D
2
”, AT-168.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-60
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 opening and vehicle speed.
Specified speed when shifting from D
2
to D
3
:
Refer to Shift schedule, AT-288.
SAT955I
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
)
Does A/T shift from D
3
to D
4
at the specified speed?
Read gear position, throttle opening and vehicle speed.
Specified speed when shifting from D
3
to D
4
:
Refer to Shift schedule, AT-288.
SAT956I
Yes or No
Yes
©
GO TO 5.
No
©
Go to “14. A/T Does Not Shift: D
3
,
D
4
”, AT-174.
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TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-61
5
CHECK LOCK-UP (D
4
TO D
4
L/U)
Does A/T perform lock-up at the specified speed?
Read vehicle speed, throttle position when lock-up duty becomes 94%.
Specified speed when lock-up occurs:
Refer to Shift schedule, AT-288.
SAT957I
Yes or No
Yes
©
GO TO 6.
No
©
Go to “15. A/T Does Not Perform Lock-up”, AT-177.
6
CHECK HOLD LOCK-UP
Does A/T hold lock-up condition for more than 30 seconds?
Yes or No
Yes
©
GO TO 7.
No
©
Go to “16. A/T Does Not Hold Lock-up Condition”, AT-179.
7
CHECK LOCK-UP OFF (D
4
L/U TO D
4
)
1. Release accelerator pedal.
2. Is lock-up released when accelerator pedal is released?
SAT958I
Yes or No
Yes
©
GO TO 8.
No
©
Go to “17. Lock-up Is Not Released”, AT-181.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-62
8
CHECK SHIFT DOWN (D
4
TO D
3
)
1. Decelerate vehicle by applying foot brake lightly.
2. Does engine speed return to idle smoothly when A/T is shifted from D
4
to D
3
?
Read gear position and engine speed.
SAT959I
Yes or No
Yes
©
1. Stop vehicle.
2. Go to “Cruise test — Part 2”, AT-64.
No
©
Go to “18. Engine Speed Does Not Return To Idle (Light Braking D
4
,
D
3
)”, AT-182.
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TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-63
Cruise Test — Part 2
=NMAT0024S0405
1
CHECK STARTING GEAR (D
1
) POSITION
1. Confirm overdrive control switch is in “ON” position.
2. Confirm selector lever is in “D” position.
3. Accelerate vehicle by half throttle again.
4. Does vehicle start from D
1
?
Read gear position.
SAT495G
Yes or No
Yes
©
GO TO 2.
No
©
Go to “19. Vehicle Does Not Start From D
1
”, AT-184.
2
CHECK SHIFT UP AND SHIFT DOWN (D
3
TO D
4
TO D
2
)
1. Accelerate vehicle to 80 km/h (50 MPH) as shown in illustration.
2. Release accelerator pedal and then quickly depress it fully.
3. Does A/T shift from D
4
to D
2
as soon as accelerator pedal is depressed fully?
Read gear position and throttle position.
SAT404H
Yes or No
Yes
©
GO TO 3.
No
©
Go to “12. A/T Does Not Shift: D
3
,
D
4
Or Does Not Kickdown: D
4
,
D
2
”, AT-168.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-64
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