2003 NISSAN TEANA timing

AT-26
A/T CONTROL SYSTEM

TCM FunctionBCS000ZP
The function of the TCM is to:

Receive input signals sent from various switches and sensors.

Determine required line pressure, shifting point, lock-up operation, and engine brake operation.

Send required output signals to the respective solenoids.
CONTROL SYSTEM OUTLINE
The automatic transmission senses vehicle operating conditions through various sensors or signals. It always
controls the optimum shift position and reduces shifting and lock-up shocks.
CONTROL SYSTEM DIAGRAM
SWITCHES & SENSORS

TCM

ACTUATORS
PNP switch
Accelerator pedal position signal
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Turbine revolution sensor (power
train revolution sensor)
Vehicle speed signal
3rd position switch signal
Stop lamp switch signalShift control
Line pressure control
Lock-up control
Overrun clutch control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-II communication line
control
CAN systemShift solenoid valve A
Shift solenoid valve B
Overrun clutch solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
A/T CHECK indicator lamp
SCIA7869E

A/T CONTROL SYSTEM
AT-33
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Control ValveBCS000ZW
FUNCTION OF CONTROL VALVES
Valve name Function
Pressure regulator valve, plug and sleeve
plugRegulates oil discharged from the oil pump to provide optimum line pressure for all driv-
ing conditions.
Pressure modifier valve and sleeve Used as a signal supplementary valve to the pressure regulator valve. Regulates pres-
sure-modifier pressure (signal pressure) which controls optimum line pressure for all
driving conditions.
Pilot valve Regulates line pressure to maintain a constant pilot pressure level which controls lock-up
mechanism, overrun clutch, shift timing.
Accumulator control valve Regulates accumulator back-pressure to pressure suited to driving conditions.
Manual valve Directs line pressure to oil circuits corresponding to select positions.
Hydraulic pressure drains when the shift lever is in Neutral.
Shift valve A Simultaneously switches three oil circuits using output pressure of shift solenoid valve A
to meet driving conditions (vehicle speed, throttle opening, etc.).
Provides automatic downshifting and upshifting (1st → 2nd → 3rd → 4th gears/4th →
3rd → 2nd → 1st gears) in combination with shift valve B.
Shift valve B Simultaneously switches two oil circuits using output pressure of shift solenoid valve B in
relation to driving conditions (vehicle speed, throttle opening, etc.).
Provides automatic downshifting and upshifting (1st → 2nd → 3rd → 4th gears/4th →
3rd → 2nd → 1st gears) in combination with shift valve A.
Overrun clutch control valve Switches hydraulic circuits to prevent engagement of the overrun clutch simultaneously
with application of the brake band in D
4 . (Interlocking occurs if the overrun clutch
engages during D
4 .)
1st reducing valve Reduces low & reverse brake pressure to dampen engine-brake shock when downshift-
ing from the 1st position 1
2 to 11 .
Overrun clutch reducing valve Reduces oil pressure directed to the overrun clutch and prevents engine-brake shock.
In the 1st and 2nd positions, line pressure acts on the overrun clutch reducing valve to
increase the pressure-regulating point, with resultant engine brake capability.
Torque converter relief valve Prevents an excessive rise in torque converter pressure.
Torque converter clutch control valve, plug
and sleeveActivates or inactivates the lock-up function.
Also provides smooth lock-up through transient application and release of the lock-up
system.
1-2 accumulator valve and piston Lessens the shock find when the 2nd gear band servo contracts, and provides smooth
shifting.
3-2 timing valve Switches the pace that oil pressure is released depending on vehicle speed; maximizes
the high clutch release timing, and allows for soft downshifting.
Shuttle valve Determines if the overrun clutch solenoid valve should control the 3-2 timing valve or the
overrun clutch control valve and switches between the two.
Cooler check valve At low speeds and with a small load when a little heat is generated, saves the volume of
cooler flow, and stores the oil pressure for lock-up.

AT-56
TROUBLE DIAGNOSIS

Shift ShockToo sharp a
shock in change
from D
2 to D3 .ON vehicle1. Accelerator pedal position sensor
EC-272
*1, EC-652*2
2. Line pressure testAT- 4 6
3. Control valve assemblyAT-225
OFF vehicle4. High clutchAT-3015. Brake bandAT-329
Too sharp a
shock in change
from D
3 to D4 .ON vehicle1. Accelerator pedal position sensor
EC-272
*1, EC-652*2
2. Line pressure testAT- 4 6
3. Control valve assemblyAT-225
OFF vehicle4. Brake bandAT-3295. Overrun clutchAT-307
6. Forward one-way clutchAT-319
Gear change
shock felt during
deceleration by
releasing acceler-
ator pedal.ON vehicle1. Accelerator pedal position sensor
EC-272*1, EC-652*2
2. Line pressure testAT- 4 6
3. Overrun clutch solenoid valveAT-100
4. Control valve assemblyAT-225
Large shock
changing from 1
2
to 1
1 in “1” posi-
tion.ON vehicle 1. Control valve assemblyAT-225OFF vehicle 2. Low & reverse brakeAT-315
Improper Shift
TimingToo high a gear
change point from
D
1 to D2 , from
D
2 to D3 , from
D
3 to D4 .ON vehicle1. Accelerator pedal position sensor
EC-272
*1, EC-652*2
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT- 8 0, AT- 8 6
3. Shift solenoid valve AAT- 9 0
4. Shift solenoid valve BAT- 9 5
Gear change
directly from D
1
to D
3 occurs.ON vehicle1. A/T fluid levelAT- 1 4
2. Accumulator servo releaseAT-225
OFF vehicle 3. Brake bandAT-329
Too high a
change point from
D
4 to D3 , from
D
3 to D 2 , from
D
2 to D1 .ON vehicle1. Accelerator pedal position sensor
EC-272
*1, EC-652*2
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT- 8 0, AT- 8 6
Kickdown does
not operate when
depressing pedal
in D
4 within kick-
down vehicle
speed.ON vehicle1. Accelerator pedal position sensor
EC-272
*1, EC-652*2
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT- 8 0, AT- 8 6
3. Shift solenoid valve AAT- 9 0
4. Shift solenoid valve BAT- 9 5
Kickdown oper-
ates or engine
overruns when
depressing pedal
in D
4 beyond
kickdown vehicle
speed limit.ON vehicle1. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT- 8 0
, AT- 8 6
2. Accelerator pedal position sensor
EC-272*1, EC-652*2
3. Shift solenoid valve AAT- 9 0
4. Shift solenoid valve BAT- 9 5
Gear change
from 2
2 to 23 in
“2” position.ON vehicle1. PNP switchAT-161
2. A/T positionAT-215
Items Symptom Condition Diagnostic item Reference page

TROUBLE DIAGNOSIS
AT-57
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Improper Shift
TimingGear change
from 11 to 12 in
“1” position.ON vehicle1. PNP switchAT- 1 6 12. A/T positionAT- 2 1 5
No Down ShiftFailure to change
gear from D
4 to
D
3 .ON vehicle1. A/T fluid levelAT- 1 4
2. Accelerator pedal position sensor
EC-272*1, EC-652*2
3. Overrun clutch solenoid valveAT- 1 0 0
4. Shift solenoid valve A AT- 9 0
5. Line pressure solenoid valveAT- 1 2 6
6. Control valve assemblyAT- 2 2 5
OFF vehicle7. Brake bandAT- 3 2 98. Overrun clutchAT- 3 0 7
Failure to change
gear from D
3 to
D
2 or from D4 to
D
2 .ON vehicle1. A/T fluid levelAT- 1 4
2. Accelerator pedal position sensor
EC-272*1, EC-652*2
3. Shift solenoid valve AAT- 9 0
4. Shift solenoid valve BAT- 9 5
5. Control valve assemblyAT- 2 2 5
OFF vehicle6. High clutchAT- 3 0 17. Brake bandAT- 3 2 9
Failure to change
gear from D
2 to
D
1 or from D3 to
D
1 .ON vehicle1. A/T fluid levelAT- 1 4
2. Accelerator pedal position sensor
EC-272*1, EC-652*2
3. Shift solenoid valve AAT- 9 0
4. Shift solenoid valve BAT- 9 5
5. Control valve assemblyAT- 2 2 5
OFF vehicle6. Low one-way clutchAT- 2 5 57. High clutchAT- 3 0 1
8. Brake bandAT- 3 2 9
Failure to change
from 3
3 to 22
when changing
lever into “2” posi-
tion.
AT-198ON vehicle1. Accelerator pedal position sensor
EC-272
*1, EC-652*2
2. Shift solenoid valve BAT- 9 5
3. Control valve assembly AT- 2 2 5
4. A/T positionAT- 2 1 5
OFF vehicle 5. Brake bandAT- 3 2 9
Does not change
from 1
2 to 11 in
“1” position.ON vehicle1. PNP switchAT- 1 6 1
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT- 8 0, AT- 8 6
3. Shift solenoid valve AAT- 9 0
4. Control valve assemblyAT- 2 2 5
5. Overrun clutch solenoid valveAT- 1 0 0
OFF vehicle6. Overrun clutchAT- 3 0 77. Low & reverse brakeAT- 3 1 5
Items Symptom Condition Diagnostic item Reference page

TROUBLE DIAGNOSIS
AT-67
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CONSULT-II Function (A/T) BCS0010D
CONSULT-II can display each diagnostic item using the diagnostic test models shown following.
FUNCTION
NOTICE:
1. The CONSULT-II electrically displays shift timing and lock-up timing (that is, operation timing of each sole-
noid).
Check for time difference between actual shift timing and the CONSULT-II display. If the difference is
noticeable, mechanical parts (except solenoids, sensors, etc.) may be malfunctioning. Check mechanical
parts using applicable diagnostic procedures.
2. Shift schedule (which implies gear position) displayed on CONSULT-II and that indicated in Service Man-
ual may differ slightly. This occurs because of the following reasons:
–Actual shift schedule has more or less tolerance or allowance,
–Shift schedule indicated in Service Manual refers to the point where shifts start, and
–Gear position displayed on CONSULT-II indicates the point where shifts are completed.
3. Shift solenoid valve “A” or “B” is displayed on CONSULT-II at the start of shifting. Gear position is dis-
played upon completion of shifting (which is computed by TCM).
CONSULT-II REFERENCE VALUE
Diagnostic test mode Function Reference page
Work supportThis mode enables a technician to adjust some devices faster and more accurately by
following the indications on CONSULT-II.—
Self-diagnostic results Self-diagnostic results can be read and erased quickly.AT- 6 9
Data monitor Input/Output data in the ECM can be read.AT- 7 0
CAN diagnostic support
monitorThe results of transmit/receive diagnosis of CAN communication can be read.AT- 7 2
Function testPerformed by CONSULT-II instead of a technician to determine whether each system
is “OK” or “NG”.—
DTC work support Select the operating condition to confirm Diagnosis Trouble Codes.AT- 7 2
TCM part number TCM part number can be read. —
Item name Condition Display value (Approx.)
VHCL/S SE-A/T
During drivingApproximately matches the speedometer
reading.
VHCL/S SE-MTR
THROTTLE POSIReleased accelerator pedal. 0.0/8
Fully depressed accelerator pedal. 8.0/8
FLUID TEMP SE When ATF temperature is 20°C (68°F). 1.5 V
When ATF temperature is 80°C (176°F). 0.5 V
BATTERY VOLT When turning ignition switch to ON. Battery voltage
ENGINE SPEED Engine runningApproximately matches the tachometer
reading.
TURBINE REV During driving (lock-up ON) Approximately matches the engine speed.
OVERDRIVE SWWhen setting selector lever to “3” and “2” posi-
tions.ON
When setting selector lever to other positions. OFF
PN POSI SWWhen setting selector lever to “N” or “P” posi-
tion.ON
When setting selector lever to other positions. OFF
R POSITION SWWhen setting selector lever to “R” position. ON
When setting selector lever to other positions. OFF

AT-120
TURBINE REVOLUTION SENSOR

TURBINE REVOLUTION SENSORPFP:31935
DescriptionBCS0012B
The turbine revolution sensor (power train revolution sensor) detects forward clutch drum rpm (revolutions per
minute). It is located on the input side of the automatic transaxle. The vehicle speed sensor A/T (Revolution
sensor) is located on the output side of the automatic transaxle. With the two sensors, input and output rpms
are accurately detected. The result is optimal shift timing during deceleration and improved shifting.
CONSULT-II Reference ValueBCS0012C
On Board Diagnosis LogicBCS0012D
Diagnostic trouble code “TURBINE SENSOR” with CONSULT-II or 10th judgement flicker without CONSULT-II
is detected when TCM does not receive the proper voltage signal from the sensor.
Possible CauseBCS0012E

Harness or connector
(Sensor circuit is open or shorted.)

Turbine revolution sensor (power train revolution sensor)
DTC Confirmation ProcedureBCS0012F
CAUTION:

Always drive vehicle at a safe speed.

Be careful not to rev engine into the red zone on the tachometer.

If performing this “DTC Confirmation Procedure” again, always turn ignition switch OFF and wait
at least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Drive vehicle under the following conditions for more than 5 sec-
onds.
SLCT LVR POSI: “D” position
VEHICLE SPEED: Higher than 40 km/h (25MPH)
ENGINE SPEED: Higher than 1,500 rpm
THROTTLE POSI: Greater than 1.0/8 of the full throttle posi-
tion
4. If DTC is detected, go to AT- 1 2 2 , "
Diagnostic Procedure" .
WITHOUT CONSULT-II
1. Start engine.
2. Drive vehicle under the following conditions for more than 5 seconds.
Selector lever position: “D” position
Vehicle speed: Higher than 40 km/h (25MPH)
Engine speed: Higher than 1,500 rpm
Throttle position: 1.0/8 of the full throttle position
3. Perform self-diagnosis. Refer to AT- 7 6 , "
Diagnostic Procedure Without CONSULT-II" .
4. If the check result is NG, go to AT- 1 2 2 , "
Diagnostic Procedure" .
Item name Condition Display value
TURBINE REV During driving (lock-up ON) Approximately matches the engine speed.
BCIA0031E

TRANSAXLE ASSEMBLY
AT-245
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Align the positions of tightening bolts for drive plate with those of
torque converter, and temporarily tighten bolts. Then, tighten
bolts with the specified torque.
CAUTION:

When turning crankshaft, turn it clockwise as viewed from
front of engine.

When tightening the tighten bolts for the torque converter
after fixing crankshaft pulley bolts, be sure to confirm the
tightening torque of crankshaft pulley mounting bolts.
Refer to EM-53, "
TIMING CHAIN" (QR engine), EM-173, "TIMING CHAIN" (VQ engine).

After converter is installed to drive plate, rotate crankshaft several turns and make sure that tran-
saxle rotates freely without binding.

Install POS sensor. Refer to EM-145, "Removal and Installation" .

After completing installation, check for A/T fluid leakage, A/T fluid level, and positions of A/T. Refer to AT-
14, "Checking A/T Fluid" , AT- 2 1 5 , "Adjustment of A/T Position" , AT- 2 1 5 , "Checking of A/T Position" . : 52 N·m (5.3 kg-m, 38 ft-lb)
SCIA3138E

AT-290
REPAIR FOR COMPONENT PARTS

DISASSEMBLY
1. Remove valves at retainer plates.
CAUTION:
Do not use a magnetic pick-up tool.
a. Use a screwdriver to remove retainer plates.
b. Remove retainer plates while holding spring, plugs or sleeves.
CAUTION:
Remove plugs slowly to prevent internal parts from jumping
out.
1. Retainer plate 2. Plug 3. Cooler check valve spring
4. Cooler check valve 5. Control valve upper body 6. Pilot valve
7. Pilot valve spring 8. Retainer plate 9. 1-2 accumulator retainer plate
10. 1-2 accumulator piston spring 11. 1-2 accumulator piston 12. Plug
13. Retainer plate 14. Retainer plate 15. Plug
16. 1st reducing valve 17. 1st reducing valve spring 18. Retainer plate
19. 3-2 timing valve spring 20. 3-2 timing valve 21. Retainer plate
22. Plug 23. Overrun clutch reducing valve 24. Overrun clutch reducing valve spring
25. Retainer plate 26. Torque converter relief valve spring 27. Torque converter relief valve
28. Retainer plate 29. Sleeve 30. Plug
31. Torque converter clutch control valve
spring32. Torque converter clutch control
valve33. Retainer plate
34. Plug 35. 1-2 accumulator valve spring 36. 1-2 accumulator valve
SCIA4979E
SAT553G
SAT554G