sensor NISSAN LATIO 2007 Service User Guide

AT-34
A/T CONTROL SYSTEM
Revision: June 20062007 Versa
CONTROL OF SHIFT VALVES A AND B
Pilot pressure generated by the operation of shift solenoid valves A and B is applied to the end face of shift
valves A and B.
The figure above shows the operation of shift valve B. When the shift solenoid valve is “ON”, pilot pressure
applied to the end face of the shift valve overcomes spring force, moving the valve upward.
Lock-up ControlUCS005MH
The torque converter clutch piston in the torque converter is locked to eliminate torque converter slip and to
increase power transmission efficiency. The solenoid valve is controlled by an ON-OFF duty signal sent from
the TCM. The signal is converted to an oil pressure signal which controls the torque converter clutch piston.
CONDITIONS FOR LOCK-UP OPERATION
When vehicle is driven in 3rd and 4th gear positions, vehicle speed and throttle opening are detected. If the
detected values fall within the lock-up zone memorized in the TCM, lock-up is performed.
TORQUE CONVERTER CLUTCH SOLENOID VALVE CONTROL
Lock-up Control System Diagram
SAT0 0 9J
OD ON OFF
Selector lever “D” position
Gear position D
4D3
Vehicle speed sensor More than set value
Accelerator pedal position signal Less than set opening
Closed throttle position signal OFF
A/T fluid temperature sensor More than 40°C (104°F)
SCIA5623E

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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ON BOARD DIAGNOSTIC (OBD) SYSTEMPFP:00028
IntroductionUCS005N3
A/T system has two self-diagnostic systems.
The first is emission-related on board diagnostic system (OBD-II) performed by the TCM in combination with
the ECM. The malfunction is indicated by the MIL (malfunction indicator lamp) and is stored as a DTC in the
ECM memory but not the TCM memory.
The second is the TCM original self-diagnosis indicated by the OD OFF indicator lamp. The malfunction is
stored in the TCM memory. The detected items are overlapped with OBD-II self-diagnostic items. For detail,
refer to AT- 8 2 , "
SELF-DIAGNOSTIC RESULT MODE" .
OBD-II Function for A/T SystemUCS005N4
The ECM provides emission-related on board diagnostic (OBD-II) functions for the A/T system. One function
is to receive a signal from the TCM used with OBD-related parts of the A/T system. The signal is sent to the
ECM when a malfunction occurs in the corresponding OBD-related part. The other function is to indicate a
diagnostic result by means of the MIL (malfunction indicator lamp) on the instrument panel. Sensors, switches
and solenoid valves are used as sensing elements.
The MIL automatically illuminates in One or Two Trip Detection Logic when a malfunction is sensed in relation
to A/T system parts.
One or Two Trip Detection Logic of OBD-IIUCS005N5
ONE TRIP DETECTION LOGIC
If a malfunction is sensed during the first test drive, the MIL will illuminate and the malfunction will be stored in
the ECM memory as a DTC. The TCM is not provided with such a memory function.
TWO TRIP DETECTION LOGIC
When a malfunction is sensed during the first test drive, it is stored in the ECM memory as a 1st trip DTC
(diagnostic trouble code) or 1st trip freeze frame data. At this point, the MIL will not illuminate. — 1st trip
If the same malfunction as that experienced during the first test drive is sensed during the second test drive,
the MIL will illuminate. — 2nd trip
The “trip” in the “One or Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation.
OBD-II Diagnostic Trouble Code (DTC)UCS005N6
HOW TO READ DTC AND 1ST TRIP DTC
DTC and 1st trip DTC can be read by the following methods.
( with CONSULT-II or GST) CONSULT-II or GST (Generic Scan Tool) Examples: P0705, P0720 etc.
These DTC are prescribed by SAE J2012.
(CONSULT-II also displays the malfunctioning component or system.)

1st trip DTC No. is the same as DTC No.

Output of the diagnostic trouble code indicates that the indicated circuit has a malfunction. How-
ever, in case of the Mode II and GST, they do not indicate whether the malfunction is still occurring
or occurred in the past and returned to normal.
CONSULT-II can identify them as shown below, therefore, CONSULT-II (if available) is recom-
mended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown
on the next page. DTC or 1st trip DTC of a malfunction is displayed
in SELF-DIAGNOSTIC RESULTS mode for “ENGINE” with CON-
SULT-II. Time data indicates how many times the vehicle was driven
after the last detection of a DTC.
SAT0 1 4K

TROUBLE DIAGNOSIS
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TROUBLE DIAGNOSISPFP:00004
DTC Inspection Priority ChartUCS005ML
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC “CAN COMM CIRCUIT” is displayed with other DTCs, first perform the trouble diagnosis for
DTC “CAN COMM CIRCUIT”. Refer to AT- 9 4
.
Fail-safeUCS005MM
The TCM has an electronic Fail-safe mode. This allows the vehicle to be driven even if a major electrical input/
output device circuit is damaged.
Under Fail-Safe, the vehicle always runs in third gear, even with a shift lever position of “1”, “2” or “D”. The cus-
tomer may complain of sluggish or poor acceleration.
Always follow the “AT - 4 6 , "
WORK FLOW" ”.
The SELF-DIAGNOSIS results will be as follows:

The first SELF-DIAGNOSIS will indicate damage to the vehicle speed sensor or the revolution sensor.

During the next SELF-DIAGNOSIS, performed after checking the sensor, no damages will be indicated.
FAI L-S AFE FUN CT ION
The following fail-safe functions allow vehicles to be driven even when sensor, switch or solenoid malfunction
occurs.
Vehicle Speed Sensor·A/T (Revolution Sensor)
Vehicle speed sensor·MTR signal is input from combination meter.
Accelerator Pedal Position Signal and Throttle Position Signal
TCM controls the throttle opening angle to a predetermined fixed position to enable driving if a malfunctioning
signal is input to TCM.
PNP Switch
When the multiple PNP switch signals are input to TCM, the priority of selector lever position becomes “D”,
“N”, “R”, “2” and “1” in order by internal TCM determination.
The use of 4th gear is inhibited until normal operation resumes. Because the hydraulic circuit of the control
valve is switched by manual valve according to the selector lever position, however, actual operating condition
of vehicle becomes as follows.
Priority Detected items
1 CAN communication line
2 Except above
Actual lever position PNP switch input signal Running status
“P” “P” position and other position signals P
“R” “R” position and other position signals R
“N” “N” position and other position signals N
“D” “D” position and other position signals D
1 ⇔D2 ⇔D3 ⇔D4
“2”“2” position and other position signals (Except “1” position) 21 ⇔22 ⇔23
“2” position and “1” position signals 21 ⇔22
“1”“1” position and other position signals (Except “2” position) 11 ⇔12 ⇔13
“1” position and “2” position signals 11 ⇔12

TROUBLE DIAGNOSIS
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How to Perform Trouble Diagnoses for Quick and Accurate RepairUCS005M N
INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, accelera-
tor pedal position sensor or PNP switch and provides shift control or
lock-up control via A/T solenoid valves.
The TCM also communicates with the ECM by means of a sig-
nalsent from sensing elements used with the OBD-related parts of
theA/T system for malfunction-diagnostic purposes. The TCM is
capa-ble of diagnosing malfunctioning parts while the ECM can store
mal-functions in its memory.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good oper-
ating condition and be free of valve seizure, solenoid valve malfunc-
tion, etc.
It is much more difficult to diagnose a malfunction that occurs intermittently rather than continuously. Most
intermittent malfunctions are caused by poor electric connections or improper wiring. In this case, careful
checking of suspected circuits may help prevent the replacement of good parts.
A visual check only, may not find the cause of the malfunctions. A
road test with CONSULT-II or a circuit tester connected should be
performed. Follow the AT-46, "
WORK FLOW" .
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such malfunctions, espe-
cially intermittent ones. Find out what symptoms are present and
under what conditions they occur. A “DIAGNOSTIC WORKSHEET”
like the example (AT- 4 7 , "
DIAGNOSTIC WORKSHEET" ) should be
used.
Start your diagnosis by looking for “conventional” malfunctions first.
This will help troubleshoot driveability malfunctions on an electroni-
cally controlled engine vehicle.
Also check related Service bulletins for information.
SAT6 3 1IA
SAT6 3 2I
SEF 2 34 G

AT-48
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
4.❏ Perform “Road Test”.AT- 5 8
4-1. “Check Before Engine is Started”AT- 5 8
❏ AT-198, "OD OFF Indicator Lamp Does Not Come On"
❏ Perform self-diagnosis. Enter checks for detected items. AT- 8 2 , AT- 9 0 .
❏ AT- 9 4 , "
DTC U1000 CAN COMMUNICATION LINE" .
❏ AT- 9 7 , "
DTC P0705 PARK/NEUTRAL POSITION (PNP) SWITCH" .
❏ AT-102, "
DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT" .
❏ AT-107, "
DTC P0720 VEHICLE SPEED SENSOR·A/T (REVOLUTION SENSOR)" .
❏ AT- 11 3 , "
DTC P0725 ENGINE SPEED SIGNAL" .
❏ AT- 11 7 , "
DTC P0731 A/T 1ST GEAR FUNCTION"
❏ AT-121, "DTC P0732 A/T 2ND GEAR FUNCTION" .
❏ AT-124, "
DTC P0733 A/T 3RD GEAR FUNCTION" .
❏ AT-128, "
DTC P0734 A/T 4TH GEAR FUNCTION" .
❏ AT-134, "
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE" .
❏ AT-139, "
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)" .
❏ AT-145, "
DTC P0745 LINE PRESSURE SOLENOID VALVE" .
❏ AT-151, "
DTC P0750 SHIFT SOLENOID VALVE A" .
❏ AT-156, "
DTC P0755 SHIFT SOLENOID VALVE B" .
❏ AT-161, "
DTC P1760 OVERRUN CLUTCH SOLENOID VALVE" .
❏ AT-166, "
DTC VEHICLE SPEED SENSOR MTR" .
❏ AT-170, "
DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)" .
❏ AT-176, "
DTC TURBINE REVOLUTION SENSOR" .
❏ AT-182, "
CONTROL UNIT (RAM), CONTROL UNIT (ROM)" .
❏ AT-183, "
MAIN POWER SUPPLY AND GROUND CIRCUIT" .
4-2. “Check at Idle”AT- 5 9
❏ AT-200, "Engine Cannot Be Started in “P” and “N” Position" .
❏ AT-201, "
In “P” Position, Vehicle Moves Forward or Backward When Pushed" .
❏ AT-201, "
In “N” Position, Vehicle Moves" .
❏ AT-202, "
Large Shock “N” → “R” Position" .
❏ AT-203, "
Vehicle Does Not Creep Backward in “R” Position" .
❏ AT-205, "
Vehicle Does Not Creep Forward in “D”, “2” or “1” Position" .

TROUBLE DIAGNOSIS
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4. 4-3. “Cruise Test”AT-6 1
Part 1
❏ AT-206, "
Vehicle Cannot Be Started from D1" .
❏ AT-208, "
A/T Does Not Shift: D1 → D2 or Does Not Kickdown: D4 → D2" .
❏ AT-210, "
A/T Does Not Shift: D2 → D3" .
❏ AT-212, "
A/T Does Not Shift: D3 → D4" .
❏ AT-214, "
A/T Does Not Perform Lock-up" .
❏ AT-215, "
A/T Does Not Hold Lock-up Condition" .
❏ AT-216, "
Lock-up Is Not Released" .
❏ AT-217, "
Engine Speed Does Not Return to Idle (Light Braking D4 → D3 )" .
Part 2AT-6 4
❏ AT-206, "Vehicle Cannot Be Started from D1" .
❏ AT-208, "
A/T Does Not Shift: D1 → D2 or Does Not Kickdown: D4 → D2" .
❏ AT-210, "
A/T Does Not Shift: D2 → D3" .
❏ AT-212, "
A/T Does Not Shift: D3 → D4" .
Part 3AT-6 5
❏ AT-218, "A/T Does Not Shift: D4 → D3 , When OD OFF" .
❏ AT-219, "
A/T Does Not Shift: D3 → 22 , When Selector Lever “D” → “2” Position" .
❏ AT-221, "
A/T Does Not Shift: 22 → 11 , When Selector Lever “2” → “1” Position" .
❏ AT-223, "
Vehicle Does Not Decelerate by Engine Brake" .
❏ Perform self-diagnosis. Enter checks for detected items. AT-8 2
, AT-9 0 .
❏ AT - 9 4 , "
DTC U1000 CAN COMMUNICATION LINE" .
❏ AT - 9 7 , "
DTC P0705 PARK/NEUTRAL POSITION (PNP) SWITCH" .
❏ AT-102, "
DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT" .
❏ AT-107, "
DTC P0720 VEHICLE SPEED SENSOR·A/T (REVOLUTION SENSOR)" .
❏ AT - 11 3 , "
DTC P0725 ENGINE SPEED SIGNAL" .
❏ AT - 11 7 , "
DTC P0731 A/T 1ST GEAR FUNCTION"
❏ AT-121, "DTC P0732 A/T 2ND GEAR FUNCTION" .
❏ AT-124, "
DTC P0733 A/T 3RD GEAR FUNCTION" .
❏ AT-128, "
DTC P0734 A/T 4TH GEAR FUNCTION" .
❏ AT-134, "
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE" .
❏ AT-139, "
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)" .
❏ AT-145, "
DTC P0745 LINE PRESSURE SOLENOID VALVE" .
❏ AT-151, "
DTC P0750 SHIFT SOLENOID VALVE A" .
❏ AT-156, "
DTC P0755 SHIFT SOLENOID VALVE B" .
❏ AT-161, "
DTC P1760 OVERRUN CLUTCH SOLENOID VALVE" .
❏ AT-166, "
DTC VEHICLE SPEED SENSOR MTR" .
❏ AT-170, "
DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)" .
❏ AT-176, "
DTC TURBINE REVOLUTION SENSOR" .
❏ AT-182, "
CONTROL UNIT (RAM), CONTROL UNIT (ROM)" .
❏ AT-183, "
MAIN POWER SUPPLY AND GROUND CIRCUIT" .
5.❏ For self-diagnosis NG items, inspect each component. Repair or replace the damaged parts.AT-8 2
,
AT-9 1
6.❏ Perform “Road Test”.AT-5 8
7.❏ Perform the Diagnostic Procedures for all remaining items marked NG. Repair or replace the damaged parts.
Refer to the Symptom Chart when you perform the procedures. (The chart also shows some other possible
symptoms and the component inspection orders.)AT-6 8
8.❏ Erase DTC from TCM and ECM memories.AT-8 3,
AT-9 3

TROUBLE DIAGNOSIS
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1. OD OFF indicator lamp 2. Shift position indicator 3. Accelerator pedal position (APP)
sensor
4. Turbine revolution sensor (Power
train revolution sensor)5. PNP switch 6. Terminal body (Terminal cord
assembly connector)
7. Revolution sensor 8. Dropping resistor 9. TCM
10. Overdrive control switch

TROUBLE DIAGNOSIS
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5. Start engine and measure line pressure at idle and stall speed.
CAUTION:

Keep the brake pedal pressed all the way down during
measurement.

When measuring the line pressure at the stall speed,
refer to AT-53, "
STALL TEST" .
Line Pressure
Judgement of Line Pressure Test
SAT4 9 3G
Engine speedLine pressure [kPa (kg/cm2 , psi)]
D, 2nd and 1st positions R position
Idle speed 500 (5.1, 73) 778 (7.9, 113)
Stall speed 1,173 (12.0, 170) 1,825 (18.6, 265)
Judgement Suspected parts
At idleLine pressure is low in all positions.

Oil pump wear

Control piston damage

Pressure regulator valve or plug sticking

Spring for pressure regulator valve damaged

Fluid pressure leakage between oil strainer and pressure regulator valve

Clogged strainer
Line pressure is low in particular posi-
tion.

Fluid pressure leakage between manual valve and particular clutch

For example, line pressure is:
− Low in “R” and “1” positions, but
− Normal in “D”, and “2” positions.
Therefore, fluid leakage exists at or around low and reverse brake circuit.
Refer to AT - 2 2 , "
CLUTCH AND BAND CHART" .
Line pressure is high.

Accelerator pedal position signal malfunction

A/T fluid temperature sensor damaged

Line pressure solenoid valve sticking

Short circuit of line pressure solenoid valve circuit

Pressure modifier valve sticking

Pressure regulator valve or plug sticking

Open in dropping resistor circuit
At stall
speedLine pressure is low.

Accelerator pedal position signal malfunction

Line pressure solenoid valve sticking

Short circuit of line pressure solenoid valve circuit

Pressure regulator valve or plug sticking

Pressure modifier valve sticking

Pilot valve sticking

AT-68
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
Symptom ChartUCS005M Z
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 Engage-
ment/TCC Inopera-
tiveTorque converter is
not locked up.ON vehicle1. Accelerator pedal position sensorEC-532
2. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTRAT- 1 0 7, AT- 1 6 6
3. Engine speed signalAT- 11 3
4. A/T fluid temperature sensorAT- 1 0 2
5. Line pressure testAT- 5 6
6. Torque converter clutch solenoid valveAT- 1 3 4
7. Control valve assemblyAT- 2 4 2
OFF vehicle 8. Torque converterAT- 2 6 8
Torque converter
clutch piston slip.ON vehicle1. A/T fluid levelAT- 1 6
2. Accelerator pedal position sensorEC-532
3. Line pressure testAT- 5 6
4. Torque converter clutch solenoid valveAT- 1 3 4
5. Line pressure solenoid valveAT- 1 4 5
6. Control valve assemblyAT- 2 4 2
OFF vehicle 7. Torque converterAT- 2 6 8
Lock-up point is
extremely high or low.ON vehicle1. Accelerator pedal position sensorEC-5322. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTRAT- 1 0 7, AT- 1 6 6
3. Torque converter clutch solenoid valveAT- 1 3 4
4. Control valve assemblyAT- 2 4 2
Shift ShockSharp shock in shift-
ing from “N” to “D”
position.ON vehicle1. Engine idling speedEC-75
2. Accelerator pedal position sensorEC-532
3. Line pressure testAT- 5 6
4. A/T fluid temperature sensorAT- 1 0 2
5. Engine speed signalAT- 11 3
6. Line pressure solenoid valveAT- 1 4 5
7. Control valve assemblyAT- 2 4 2
8. Accumulator N-DAT- 2 4 2
OFF vehicle 9. Forward clutchAT- 3 2 0
Too sharp a shock in
changing from D
1 to
D
2 .ON vehicle1. Accelerator pedal position sensorEC-532
2. Line pressure testAT- 5 6
3. Accumulator servo releaseAT- 2 4 2
4. Control valve assemblyAT- 2 4 2
5. A/T fluid temperature sensorAT- 1 0 2
OFF vehicle 6. Brake bandAT- 3 4 3

TROUBLE DIAGNOSIS
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Shift ShockToo sharp a shock in
changing from D
2 to
D
3 .ON vehicle1. Accelerator pedal position sensorEC-532
2. Line pressure testAT- 5 6
3. Control valve assemblyAT- 2 4 2
OFF vehicle4. High clutchAT- 3 1 45. Brake bandAT- 3 4 3
Too sharp a shock in
changing from D
3 to
D
4 .ON vehicle1. Accelerator pedal position sensorEC-532
2. Line pressure testAT- 5 6
3. Control valve assemblyAT- 2 4 2
OFF vehicle4. Brake bandAT- 3 4 35. Overrun clutchAT- 3 2 0
6. Forward one-way clutchAT- 3 3 2
Gear change shock
during deceleration
by releasing accelera-
tor pedal.ON vehicle1. Accelerator pedal position sensorEC-5322. Line pressure testAT- 5 6
3. Overrun clutch solenoid valveAT- 1 6 1
4. Control valve assemblyAT- 2 4 2
Large shock in
changing from 1
2 to
1
1 in “1” position.ON vehicle 1. Control valve assemblyAT- 2 4 2OFF vehicle 2. Low & reverse brakeAT- 3 2 7
Improper Shift TimingToo high a gear
change point from D
1
to D
2 , from D2 t o D3 ,
from D
3 to D4 .ON vehicle1. Accelerator pedal position sensorEC-532
2. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTRAT- 1 0 7, AT- 1 6 6
3. Shift solenoid valve AAT- 1 5 1
4. Shift solenoid valve BAT- 1 5 6
Gear change directly
from D
1 to D3
occurs.ON vehicle1. A/T fluid levelAT- 1 62. Accumulator servo releaseAT- 2 4 2
OFF vehicle 3. Brake bandAT- 3 4 3
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 sensorEC-532
2. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTRAT- 1 0 7, AT- 1 6 6
Kickdown does not
operate when
depressing accelera-
tor pedal in D
4 within
kickdown vehicle
speed.ON vehicle1. Accelerator pedal position sensorEC-532
2. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTRAT- 1 0 7, AT- 1 6 6
3. Shift solenoid valve AAT- 1 5 1
4. Shift solenoid valve BAT- 1 5 6
Kickdown operates or
engine overruns
when depressing
accelerator pedal in
D
4 beyond kickdown
vehicle speed limit.ON vehicle1. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTRAT- 1 0 7
, AT- 1 6 6
2. Accelerator pedal position sensorEC-532
3. Shift solenoid valve AAT- 1 5 1
4. Shift solenoid valve BAT- 1 5 6
Gear change from 22
to 2
3 in “2” position.ON vehicle1. PNP switch adjustmentAT- 2 4 72. Control cable adjustmentAT- 2 3 3
Gear change from 11
to 1
2 in “1” position.ON vehicle1. PNP switch adjustmentAT- 2 4 72. Control cable adjustmentAT- 2 3 3
Items Symptom Condition Diagnostic item Reference page