engine oil NISSAN 350Z 2007 Z33 Automatic Transmission Workshop Manual

AT-3
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Revision: 2006 November2007 350Z Description ........................................................... 145
CONSULT-III Reference Value ............................. 145
On Board Diagnosis Logic ................................... 145
Possible Cause .................................................... 145
DTC Confirmation Procedure ............................... 145
Diagnostic Procedure ........................................... 146
DTC P1757 FRONT BRAKE SOLENOID VALVE .. 147
Description ........................................................... 147
CONSULT-III Reference Value ............................. 147
On Board Diagnosis Logic ................................... 147
Possible Cause .................................................... 147
DTC Confirmation Procedure ............................... 147
Diagnostic Procedure ........................................... 148
DTC P1762 DIRECT CLUTCH SOLENOID VALVE . 149
Description ........................................................... 149
CONSULT-III Reference Value ............................. 149
On Board Diagnosis Logic ................................... 149
Possible Cause .................................................... 149
DTC Confirmation Procedure ............................... 149
Diagnostic Procedure ........................................... 150
DTC P1767 HIGH AND LOW REVERSE CLUTCH
SOLENOID VALVE ................................................. 151
Description ........................................................... 151
CONSULT-III Reference Value ............................. 151
On Board Diagnosis Logic ................................... 151
Possible Cause .................................................... 151
DTC Confirmation Procedure ............................... 151
Diagnostic Procedure ........................................... 152
DTC P1772 LOW COAST BRAKE SOLENOID
VALVE ..................................................................... 153
Description ........................................................... 153
CONSULT-III Reference Value ............................. 153
On Board Diagnosis Logic ................................... 153
Possible Cause .................................................... 153
DTC Confirmation Procedure ............................... 153
Diagnostic Procedure ........................................... 154
DTC P1774 LOW COAST BRAKE SOLENOID
VALVE FUNCTION ................................................. 155
Description ........................................................... 155
CONSULT-III Reference Value ............................. 155
On Board Diagnosis Logic ................................... 155
Possible Cause .................................................... 155
DTC Confirmation Procedure ............................... 155
Diagnostic Procedure ........................................... 156
DTC P1815 MANUAL MODE SWITCH .................. 157
Description ........................................................... 157
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... 157
On Board Diagnosis Logic ................................... 157
Possible Cause .................................................... 157
DTC Confirmation Procedure ............................... 157
Wiring Diagram — AT — MMSW ......................... 158
Diagnostic Procedure ........................................... 160
Component Inspection ......................................... 161
MAIN POWER SUPPLY AND GROUND CIRCUIT . 162
Wiring Diagram — AT — MAIN ............................ 162
Diagnostic Procedure ........................................... 163
CLOSED THROTTLE POSITION AND WIDE OPEN
THROTTLE POSITION CIRCUIT ........................... 166CONSULT-III Reference Value .............................166
Diagnostic Procedure ...........................................166
BRAKE SIGNAL CIRCUIT ......................................167
CONSULT-III Reference Value .............................167
Diagnostic Procedure ...........................................167
A/T INDICATOR CIRCUIT .......................................168
Description ............................................................168
CONSULT-III Reference Value .............................168
Diagnostic Procedure ...........................................168
TROUBLE DIAGNOSIS FOR SYMPTOMS ............169
Wiring Diagram — AT — NONDTC ......................169
A/T Check Indicator Lamp Does Not Come On ....172
Engine Cannot Be Started in “P” or “N” Position ..173
In “P” Position, Vehicle Moves When Pushed ......173
In “N” Position, Vehicle Moves ..............................174
Large Shock (“N” to “D” Position) .........................175
Vehicle Does Not Creep Backward in “R” Position .177
Vehicle Does Not Creep Forward in “D” Position . 179
Vehicle Cannot Be Started from D
1 ......................181
A/T Does Not Shift: D
1 → D2 ................................183
A/T Does Not Shift: D
2 → D3 ................................185
A/T Does Not Shift: D
3 → D4 ................................187
A/T Does Not Shift: D
4 → D5 ................................189
A/T Does Not Lock-up ..........................................191
A/T Does Not Hold Lock-up Condition ..................193
Lock-up Is Not Released ......................................194
Engine Speed Does Not Return to Idle ................195
Cannot Be Changed to Manual Mode ..................196
A/T Does Not Shift: 5th Gear → 4th Gear ............196
A/T Does Not Shift: 4th Gear → 3rd Gear ............198
A/T Does Not Shift: 3rd Gear → 2nd Gear ...........199
A/T Does Not Shift: 2nd Gear → 1st Gear ...........201
Vehicle Does Not Decelerate by Engine Brake ....202
SHIFT CONTROL SYSTEM ....................................204
Control Device Removal and Installation ..............204
Control Rod Removal and Installation ..................205
Adjustment of A/T Position ...................................206
Checking of A/T Position ......................................206
A/T SHIFT LOCK SYSTEM ....................................207
Description ............................................................207
Shift Lock System Electrical Parts Location .........207
Wiring Diagram — AT — SHIFT ...........................208
Diagnostic Procedure ...........................................209
KEY INTERLOCK CABLE ......................................212
Components .........................................................212
Removal and Installation ......................................213
ON-VEHICLE SERVICE ..........................................215
Control Valve with TCM and A/T Fluid Temperature
Sensor 2 ...............................................................215
Parking Components ............................................227
Rear Oil Seal ........................................................234
Revolution Sensor ................................................235
AIR BREATHER HOSE ..........................................241
Removal and Installation ......................................241
TRANSMISSION ASSEMBLY ................................242
Removal and Installation ......................................242
OVERHAUL ............................................................246
Components .........................................................246

A/T CONTROL SYSTEM
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Line Pressure ControlNCS0001P

When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM, the
TCM controls the line pressure solenoid.

This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the
pressure of the operating oil discharged from the oil pump to the line pressure most appropriate to the
driving state.
LINE PRESSURE CONTROL IS BASED ON THE TCM LINE PRESSURE CHARACTERISTIC
PATTERN

The TCM has stored in memory a number of patterns for the optimum line pressure characteristic for the
driving state.

In order to obtain the most appropriate line pressure characteristic to meet the current driving state, the
TCM controls the line pressure solenoid current valve and thus controls the line pressure.
Normal Control
Each clutch is adjusted to the necessary pressure to match the
engine drive force.
Back-up Control (Engine Brake)
When the select operation is performed during driving and the A/T is
shifted down, the line pressure is set according to the vehicle speed.
PCIA0007E
PCIA0008E
PCIA0009E

A/T CONTROL SYSTEM
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NORMAL SHIFT CONTROL
The clutch is controlled with the optimum timing and oil pressure by the engine speed, engine torque informa-
tion, etc.
Shift Change System Diagram
*1: Full phase real-time feedback control monitors movement of gear ratio at gear change, and controls oil
pressure at real-time to achieve the best gear ratio.
BLIPPING CONTROL
This system makes transmission clutch engage readily by controlling (synchronizing) engine revolution
according to the (calculation of) engine revolution after shifting down.

“BLIPPING CONTROL” functions.
–When downshifting by accelerator pedal depression at “D” position.
–When downshifting under the manual mode.

TCM selects “BLIPPING CONTROL” or “NORMAL SHIFT CONTROL” according to the gear position, the
select lever position, the engine torque and the speed when accelerating by pedal depression.

Revolution control demand signal is transmitted from TCM to ECM under “BLIPPING CONTROL”.

TCM synchronizes engine revolution according to the revolution control demand signal.
PCIA0013E

A/T CONTROL SYSTEM
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SMOOTH LOCK-UP CONTROL
When shifting from the lock-up released state to the lock-up applied state, the current output to the torque con-
verter clutch solenoid is controlled with the TCM. In this way, when shifting to the lock-up applied state, the
torque converter clutch is temporarily set to the half-clutched state to reduce the shock.
Half-clutched State
The current output from the TCM to the torque converter clutch solenoid is varied to gradually increase the
torque converter clutch solenoid pressure.
In this way, the lock-up apply pressure gradually rises and while the torque converter clutch piston is put into
half-clutched status, the torque converter clutch piston operating pressure is increased and the coupling is
completed smoothly.
Slip Lock-up Control
In the slip region, the torque converter clutch solenoid current is controlled with the TCM to put it into the half-
clutched state. This absorbs the engine torque fluctuation and lock-up operates from low speed.
This raises the fuel efficiency for 4th and 5th gears at both low speed and when the accelerator has a low
degree of opening.
Engine Brake ControlNCS0001S

The forward one-way clutch transmits the drive force from the engine to the rear wheels. But the reverse
drive from the rear wheels is not transmitted to the engine because the one-way clutch is idling.
Therefore, the low coast brake solenoid is operated to prevent the forward one-way clutch from idling and
the engine brake is operated in the same manner as conventionally.

The operation of the low coast brake solenoid switches the low coast brake switching valve and controls
the coupling and releasing of the low coast brake.
The low coast brake reducing valve controls the low coast brake coupling force.
Control ValveNCS0001T
FUNCTION OF CONTROL VALVE
SCIA1520E
Name Function
Torque converter regulator valveIn order to prevent the pressure supplied to the torque converter from being excessive,
the line pressure is adjusted to the optimum pressure (torque converter operating pres-
sure).
Pressure regulator valve
Pressure regulator plug
Pressure regulator sleeveAdjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for
the driving state.
Front brake control valveWhen the front brake is coupled, adjusts the line pressure to the optimum pressure
(front brake pressure) and supplies it to the front brake. (In 1st, 2nd, 3rd, and 5th gears,
adjusts the clutch pressure.)

AT-36
A/T CONTROL SYSTEM
Revision: 2006 November2007 350Z
FUNCTION OF ATF PRESSURE SWITCH
Accumulator control valveAdjusts the pressure (accumulator control pressure) acting on the accumulator piston
and low coast reducing valve to the pressure appropriate to the driving state.
Pilot valve AAdjusts the line pressure and produces the constant pressure (pilot pressure) required
for line pressure control, shift change control, and lock-up control.
Pilot valve BAdjusts the line pressure and produces the constant pressure (pilot pressure) required
for shift change control.
Low coast brake switching valve During engine braking, supplies the line pressure to the low coast brake reducing valve.
Low coast brake reducing valveWhen the low coast brake is coupled, adjusts the line pressure to the optimum pressure
(low coast brake pressure) and supplies it to the low coast brake.
N-R accumulator Produces the stabilizing pressure for when N-R is selected.
Direct clutch piston switching valve Operates in 4th gear and switches the direct clutch coupling capacity.
High and low reverse clutch control valveWhen the high and low reverse clutch is coupled, adjusts the line pressure to the opti-
mum pressure (high and low reverse clutch pressure) and supplies it to the high and low
reverse clutch. (In 1st, 3rd, 4th and 5th gears, adjusts the clutch pressure.)
Input clutch control valveWhen the input clutch is coupled, adjusts the line pressure to the optimum pressure
(input clutch pressure) and supplies it to the input clutch. (In 4th and 5th gears, adjusts
the clutch pressure.)
Direct clutch control valveWhen the direct clutch is coupled, adjusts the line pressure to the optimum pressure
(direct clutch pressure) and supplies it to the direct clutch. (In 2nd, 3rd, and 4th gears,
adjusts the clutch pressure.)
TCC control valve
TCC control plug
TCC control sleeveSwitches the lock-up to operating or released. Also, by performing the lock-up operation
transiently, lock-up smoothly.
Torque converter lubrication valveOperates during lock-up to switch the torque converter, cooling, and lubrication system
oil passage.
Cool bypass valve Allows excess oil to bypass cooler circuit without being fed into it.
Line pressure relief valve Discharges excess oil from line pressure circuit.
N-D accumulator Produces the stabilizing pressure for when N-D is selected.
Manual valveSends line pressure to each circuit according to the select position. The circuits to which
the line pressure is not sent drain. Name Function
Name Function
ATF pressure switch 2 (LC/B)Detects any malfunction in the low coast brake hydraulic pressure. When it detects any
malfunction, it puts the system into fail-safe mode.

TROUBLE DIAGNOSIS
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Inspections Before Trouble DiagnosisNCS00024
A/T FLUID CHECK
A/T Fluid Leakage and A/T Fluid Level Check
Inspect for A/T fluid leakage and check the A/T fluid level. Refer to AT- 1 2 , "Checking A/T Fluid" .
A/T Fluid Condition Check
Inspect the A/T fluid condition.
STALL TEST
Stall Test Procedure
1. Inspect the amount of engine oil. Replenish the engine oil if necessary.
2. Drive for about 10 minutes to warm up the vehicle so that the A/
T fluid temperature is 50 to 80°C (122 to 176°F). Inspect the
amount of ATF. Replenish if necessary.
3. Securely engage the parking brake so that the tires do not turn.
4. Engine start, apply foot brake, and place selector lever in “D”
position.
5. While holding down the foot brake, gradually press down accel-
erator pedal.
6. Quickly read off the stall speed, then quickly remove your foot
from accelerator pedal.
CAUTION:
Do not hold down accelerator pedal for more than 5 sec-
onds during this test.
7. Move selector lever to “N” position.
Fluid condition Conceivable Cause Required Operation
Varnished (viscous
varnish state)Clutch, brake
scorchedReplace the ATF and check the A/
T main unit and the vehicle for
malfunctions (wire harnesses,
cooler pipes, etc.)
Milky white or cloudy Water in the fluidReplace the ATF and check for
places where water is getting in.
Large amount of metal
powder mixed inUnusual wear of
sliding parts within
A/TReplace the ATF and check for
improper operation of the A/T.
SAT638A
SAT647B
SAT513G
Stall speed: 2,700 – 3,000 rpm
SAT514G

AT-50
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
8. Cool down the ATF.
CAUTION:
Run the engine at idle for at least one minute.
9. Repeat steps 5 through 8 with selector lever in “R” position.
Judgment Stall Test
O: Stall speed within standard value position
H: Stall speed higher than standard value
L: Stall speed lower than standard value
Stall Test Standard Value Position
LINE PRESSURE TEST
Line Pressure Test Port
Line Pressure Test Procedure
1. Inspect the amount of engine oil and replenish if necessary.
2. Drive the car for about 10 minutes to warm it up so that the ATF reaches in range of 50 to 80°C (122 to
176°F), then inspect the amount of ATF and replenish if necessary.
NOTE:
The A/T fluid temperature rises in range of 50 to 80°C (122 to 176°F) during 10 minutes of driving.
Selector lever position
Expected problem location
“D” and “M” “R”
Stall speedHO

Forward brake

Forward one-way clutch

1st one-way clutch

3rd one-way clutch
OH

Reverse brake
LL

Engine and torque converter one-way clutch
HH

Line pressure low
Does not shift-up “D” or “M” position 1 → 2 Slipping in 2nd, 3rd or 4th gear Direct clutch slippage
Does not shift-up “D” or “M” position 2 → 3 Slipping in 3rd, 4th or 5th gear High and low reverse clutch slippage
Does not shift-up “D” or “M” position 3 → 4 Slipping in 4th or 5th gear Input clutch slippage
Does not shift-up “D” or “M” position 4 → 5 Slipping in 5th gear Front brake slippage
SCIA2187E

TROUBLE DIAGNOSIS
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3. After warming up remove the oil pressure detection plug and
install the oil pressure gauge [ST2505S001(J-34301-C)].
CAUTION:
When using the oil pressure gauge, be sure to use O- ring
attached to the oil pressure detection plug.
4. Securely engage the parking brake so that the tires do not turn.
5. Start the engine, then measure the line pressure at both idle and
the stall speed.
CAUTION:

Keep brake pedal pressed all the way down during mea-
surement.

When measuring the line pressure at the stall speed,
refer to AT- 4 9 , "
STALL TEST" .
6. After the measurements are complete, install the oil pressure
detection plug and tighten to the specified torque. Refer to AT-
246, "Components" .
CAUTION:

Do not reuse O-ring.

Apply ATF to O-ring.
Line Pressure
SCIA5309E
SAT513G
SAT493G
Engine speedLine pressure kPa (kg/cm2 , psi)
“R” position “D” and “M” positions
At idle speed 425 – 465 (4.3 – 4.7, 62 – 67) 379 – 428 (3.9 – 4.4, 55 – 62)
At stall speed 1,605 – 1,950 (16.4 – 19.9, 233 – 283) 1,310 – 1,500 (13.4 – 15.3, 190 – 218)

AT-52
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
Judgment of Line Pressure Test
ROAD TEST
Description

The road test inspects overall performance of A/T and analyzes possible malfunction causes.

The road test is performed in the following three stages.
1. Check before engine is started. Refer to AT- 5 3 , "
Check Before Engine is Started" .
2. Check at idle. Refer to AT- 5 3 , "
Check at Idle" .
3. Cruise test
–Inspect all the items from Part 1 to Part 3. Refer to AT- 5 5 , "Cruise Test — Part 1" , AT- 5 7 , "Cruise Test —
Part 2" and AT- 5 8 , "Cruise Test — Part 3" .

Before beginning the road test, check the test procedure and inspection items.

Test all inspection items until the symptom is uncovered. Diagnose NG items when all road tests are com-
plete.
Judgment Possible cause
Idle speedLow for all positions
(“P”, “R”, “N”, “D”, “M”)Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example

Oil pump wear

Pressure regulator valve or plug sticking or spring fatigue

Oil strainer
oil pump
pressure regulator valve passage oil leak

Engine idle speed too low
Only low for a specific
positionPossible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
HighPossible causes include a sensor malfunction or malfunction in the line pressure adjustment
function.
For example

Accelerator pedal position signal malfunction

A/T fluid temperature sensor malfunction

Line pressure solenoid malfunction (sticking in OFF state, filter clog, cut line)

Pressure regulator valve or plug sticking
Stall speedLine pressure does
not rise higher than
the line pressure for
idle.Possible causes include a sensor malfunction or malfunction in the pressure adjustment func-
tion.
For example

Accelerator pedal position signal malfunction

TCM breakdown

Line pressure solenoid malfunction (shorting, sticking in ON state)

Pressure regulator valve or plug sticking

Pilot valve sticking or pilot filter clogged
The pressure rises,
but does not enter the
standard position.Possible causes include malfunctions in the pressure supply system and malfunction in the
pressure adjustment function.
For example

Accelerator pedal position signal malfunction

Line pressure solenoid malfunction (sticking, filter clog)

Pressure regulator valve or plug sticking

Pilot valve sticking or pilot filter clogged
Only low for a specific
positionPossible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.

TROUBLE DIAGNOSIS
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Cruise Test — Part 1NCS00027
1. CHECK STARTING OUT FROM D1
1. Drive the vehicle for about 10 minutes to warm up the engine oil and ATF.
Appropriate temperature for the ATF: 50 to 80°C (122 to 176°F)
2. Park the vehicle on a level surface.
3. Move selector lever to “P” position.
4. Start engine.
5. Move selector lever to “D” position.
6. Press the accelerator pedal about half-way down to accelerate the vehicle.
With CONSULT-III
Read the gear position. Refer to AT- 8 8 , "
DATA MONITOR MODE" .
Starts from D
1 ?
YES >> GO TO 2.
NO >> Enter a check mark at AT- 1 8 1 , "
Vehicle Cannot Be Started from D1" on the AT- 4 4 , "DIAGNOSTIC
WORKSHEET" , then continue the road test.
2. CHECK SHIFT-UP D1 → D2
Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D1 → D2 ) at the appro-
priate speed. Refer to AT- 5 8 , "
Vehicle Speed at When Gears Shifting Occurs" .
With CONSULT-III
Read the gear position, throttle position, and vehicle speed. Refer to AT- 8 8 , "
DATA MONITOR MODE" .
Does the A/T shift
-up D1 → D2 at the correct speed?
YES >> GO TO 3.
NO >> Enter a check mark at AT- 1 8 3 , "
A/T Does Not Shift: D1 → D2" on the AT- 4 4 , "DIAGNOSTIC
WORKSHEET" , then continue the road test.
3. CHECK SHIFT-UP D2 → D3
Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D2 → D3 ) at the appro-
priate speed. Refer to AT- 5 8 , "
Vehicle Speed at When Gears Shifting Occurs" .
With CONSULT-III
Read the gear position, throttle position, and vehicle speed. Refer to AT- 8 8 , "
DATA MONITOR MODE" .
Does the A/T shift-up D
2 → D3 at the correct speed?
YES >> GO TO 4.
NO >> Enter a check mark at AT- 1 8 5 , "
A/T Does Not Shift: D2 → D3" on the AT- 4 4 , "DIAGNOSTIC
WORKSHEET" , then continue the road test.
4. CHECK SHIFT-UP D3 → D4
Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D3 → D4 ) at the appro-
priate speed. Refer to AT- 5 8 , "
Vehicle Speed at When Gears Shifting Occurs" .
With CONSULT-III
Read the gear position, throttle position, and vehicle speed. Refer to AT- 8 8 , "
DATA MONITOR MODE" .
Does the A/T shift-up D
3 → D4 at the correct speed?
YES >> GO TO 5.
NO >> Enter a check mark at AT- 1 8 7 , "
A/T Does Not Shift: D3 → D4" on the AT- 4 4 , "DIAGNOSTIC
WORKSHEET" , then continue the road test.