sensor NISSAN LATIO 2009 Service Repair Manual

CVT
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DTC P0841 PRESSURE SENSOR FUNCTION
Description INFOID:0000000004305717
Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolu-
tion speed as input signal, TCM changes the operating pr essure of the primary pulley and the secondary pul-
ley and changes the groove width of the pulley to control the gear ratio.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004305718
Remarks: Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004305719
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0841 PRESS SEN/FNCTN” with CONSULT-III is detected when secondary fluid
pressure is too high compared with the commanded value while driving.
Possible Cause INFOID:0000000004305720
• Transmission fluid pressure sensor A (Secondary pressure sensor)
• Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation Procedure INFOID:0000000004305721
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MO NITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Start engine and maintain the following conditions for at least 12 consecutive seconds. VEHICLE SPEED: 40 km/h (25 MPH) More than
RANGE: “D” position
3. If DTC is detected, go to CVT-291, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004305722CONSULT-III Function (TRANSMISSION) " .
Is any malfunction of the “ U1000 CAN COMM CIRCUIT ” indicated?
YES >> Check CAN communication line. Refer to
CVT-238 .
NO >> GO TO 2.

OK >> GO TO 6.
NG >> GO TO 3. Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 4.
NG >> Repair or replace damaged parts. Refer to CVT-219, " Inspections before Trouble Diagnosis " .
4. CHECK TRANSMISSION FLUID PRESSURE SENS OR A (SECONDARY PRESSURE SENSOR) SYS- .
OK or NG OK >> GO TO 5.
NG >> Repair or replace damaged parts. Component Inspec-
tion " .
• Step motor. Refer to CVT-314, " Component Inspection " .
OK or NG6 OK >> GO TO 6.
NG >> Repair or replace damaged parts. DTC Confirmation Procedure " .
OK or NG OK >>
INSPECTION END
NG >> Replace TCM or transaxle assembly. Refer to CVT-354, " Removal and Installation " .
Item name Condition Display value (Approx.)
PRI HYDR SEN “N” position idle 0.7 V
SEC HYDR SEN 1.0 V Name Connector Terminal Condition
Voltage
(Approx.)
Transmission fluid
pressure sensor A
(Secondary pres-
sure sensor) E32 37 - Ground “N” position idle 1.0 V B

CVT
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DTC P0868 SECONDARY PRESSURE DOWN
Description INFOID:0000000004305730
• The pressure control solenoid valve B (secondary pressure solenoid valve) is included in the control valve assembly.
• The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pres-
sure to suit the driving condition in response to a signal sent from the TCM.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004305731
Remarks: Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004305732
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0868 SEC/PRESS DOWN” with CONSULT-III is detected when secondary fluid
pressure is too low compared with the commanded value while driving.
Possible Cause INFOID:0000000004305733
• Harness or connectors (Solenoid circuit is open or shorted.)
• Pressure control solenoid valve B (Secondary pressure solenoid valve) system
• Transmission fluid pressure sensor A (Secondary pressure sensor)
• Line pressure control system
DTC Confirmation Procedure INFOID:0000000004305734
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MO NITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Make sure that output voltage of CVT fluid temperature sensor is within the range below.
ATF TEMP SEN: 1.0 - 2.0 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to
increase the voltage (c ool down the fluid)
3. Start engine and maintain the following conditions for at least 10 consecutive seconds. VEHICLE SPEED (accelerate slowly): 0 → 50 km/h (31 MPH)
ACC PEDAL OPEN: 0.5/8 - 1.0/8
RANGE: “D” position
4. If DTC is detected, go to CVT-293, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004305735

OK >> GO TO 5.
NG >> GO TO 2. Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 3.
NG >> Repair or replace damaged parts. Refer to CVT-219, " Inspections before Trouble Diagnosis " .
Component
Inspection " .
• Pressure control solenoid valve A (Line pressure solenoid valve). Refer to CVT-276, " Component Inspec-
tion " .
OK or NG OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK TRANSMISSION FLUID PRESSURE SENS OR A (SECONDARY PRESSURE SENSOR) SYS- .
OK or NG OK >> GO TO 5.
NG >> Repair or replace damaged parts. Wiring Diagram - CVT - POWER " .
• The TCM pin terminals for damage or loose connection with harness connector.
OK or NG OK >> GO TO 6.
NG >> Repair or replace damaged parts. DTC Confirmation Procedure " .
OK or NG OK >>
INSPECTION END
NG >> Replace the transaxle assembly. Refer to CVT-354, " Removal and Installation " .

CVT
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DTC P1705 THROTTLE POSITION SENSOR
Description INFOID:0000000004305742
Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle
position sensor etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM with CAN
communication.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004305743
Remarks: Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004305744
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1705 TP SEN/CIRC A/T” with CONSULT-III is detected when TCM does not
receive the proper accelerator pedal position si gnals (input by CAN communication) from ECM.
Possible Cause INFOID:0000000004305745
• ECM
• Harness or connectors
(CAN communication line is open or shorted.)
DTC Confirmation Procedure INFOID:0000000004305746
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Depress accelerator pedal fully and release it, then wait for 5 seconds.
4. If DTC is detected, go to CVT-299, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004305747CONSULT-III Functi
on (TRANSMISSION) " .
Is any malfunction of the “ U1000 CAN COMM CIRCUIT ” indicated?
YES >> Check the CAN communication line. Refer to
CVT-238 .
NO >> GO TO 2. Item name Condition Display value (Approx.)
ACC PEDAL OPEN Release accelerator ped-
al.↓
Fully depressed acceler- ator pedal 0.0/8
↓
8.0/8

CVT
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DTC P1722 ESTM VEHICLE SPEED SIGNAL
Description INFOID:0000000004305748
The vehicle speed signal is transmitt ed from ABS actuator and electric unit (control unit) to TCM by CAN com-
munication line.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004305749
Remarks: Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004305750
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1722 ESTM VEH SPD SIG” with CONSULT-III is detected when TCM does not
receive the proper vehicle speed signal (input by CAN communication) from ABS actuator and electric unit
(control unit).
Possible Cause INFOID:0000000004305751
• Harness or connectors (Sensor circuit is open or shorted.)
• ABS actuator and electric unit (control unit)
DTC Confirmation Procedure INFOID:0000000004305752
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESU LTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start engine and maintain the following conditions for at least 5 consecutive seconds.
ACC PEDAL OPEN: 1.0/8 or less
VEHICLE SPEED SE: 30 km/h (17 MPH) or more
4. If DTC is detected, go to CVT-301, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004305753CONSULT-III Functi
on (TRANSMISSION) " .
Is any malfunction of the “ U1000 CAN COMM CIRCUIT ” indicated?
YES >> Check CAN communication line. Refer to
CVT-238 .
NO >> GO TO 2. CONSULT-III
Function (ABS) " .
OK or NG OK >> GO TO 3.
NG >> Repair or replace damaged parts.
Item name Condition Display value
ESTM VSP SIG During driving Approximately matches the speedometer reading.
VEHICLE SPEED

CVT
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DTC P1723 CVT SPEED SENSOR FUNCTION
Description INFOID:0000000004305754
• The input speed sensor (primary speed sensor) is included in the control valve assembly.
• The vehicle speed sensor CVT [output speed sensor (s econdary speed sensor)] detects the revolution of the
idler gear and generates a pulse signal. The pulse signal is sent to the TCM, which converts it into vehicle
speed.
• The input speed sensor (primary speed sensor) detects the primary pulley revolution speed and sends a sig-
nal to the TCM.
On Board Diagnosis Logic INFOID:0000000004305755
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1723 CVT SPD SEN/FNCTN” with CONSULT-III is detected when there is a great
difference between the vehicle speed signal and the secondary speed sensor signal.
CAUTION:
One of the “P0720 VEH SPD SEN/CIR AT”, the “P0715 INPUT SPD SEN/CIRC” or the “P0725 ENGINE
SPEED SIG“ is displayed with the DTC at the same time.
Possible Cause INFOID:0000000004305756
• Harness or connectors (Sensor circuit is open or shorted.)
• Output speed sensor (Secondary speed sensor)
• Input speed sensor (Primary speed sensor)
• Engine speed signal system
DTC Confirmation Procedure INFOID:0000000004305757
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESU LTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MO NITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Start engine and maintain the following conditions for at least 5 consecutive seconds.
VEHICLE SPEED SE: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
ENG SPEED: 450 rpm or more
Driving location: Driving the vehic le uphill (increased engine load) will help maintain the driving
conditions required for this test.
3. If DTC is detected, go to CVT-303, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004305758CONSULT-III Functi
on (TRANSMISSION) " .
Is a malfunction in the step motor function indicated in the results? YES >> Repair or replace damaged parts. (C
heck the step motor function. Refer to CVT-315 .)
NO >> GO TO 2.
2. CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR SYSTEM) AND INPUT SPEED ,
CVT-254 .

CVT
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DTC P1726 ELECTRIC TH
ROTTLE CONTROL SYSTEM
Description INFOID:0000000004305759
Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle
position sensor etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM with CAN
communication.
On Board Diagnosis Logic INFOID:0000000004305760
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1726 ELEC TH CONTROL” wit h CONSULT-III is detected when the electronically
controlled throttle for ECM is malfunctioning.
Possible Cause INFOID:0000000004305761
Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation Procedure INFOID:0000000004305762
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESU LTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start engine and let it idle for 5 second.
4. If DTC is detected, go to CVT-305, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004305763 CONSULT-III
Function (ENGINE) " .
OK or NG OK >> GO TO 2.
NG >> Check the DTC Detected Item. Refer to EC-1116, " CONSULT-III Function (ENGINE) " .
• If CAN communication line is detected, go to CVT-238 .
DTC Confirmation Procedure " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 3. OK >> Replace TCM. Refer to
CVT-190, " Service After Replacing TCM and Transaxle Assembly " .
NG >> Repair or replace damaged parts.

CVT
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DTC P1778 STEP MOTOR - FUNCTION
Description INFOID:0000000004305785
• The step motor is included in the control valve assembly.
• The step motor's 4 aspects of ON/OFF change according to the signal from TCM. As a result, the flow of line
pressure to primary pulley is changed and pulley ratio is controlled.
• This diagnosis item is detected when electrical system is OK, but mechanical system is NG.
• This diagnosis item is detected when the state of the changing the speed mechanism in unit does not oper-
ate normally.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004305786
Remarks: Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004305787
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1778 STEP MOTR/FNC” with CO NSULT-III is detected under the following condi-
tions.
- When not changing the pulley ratio according to the instruction of TCM.
Possible Cause INFOID:0000000004305788
Step motor
DTC Confirmation Procedure INFOID:0000000004305789
CAUTION:
• Always drive vehicle at a safe speed.
• Before starting “DTC Confirmation Procedure”, confirm “Hi” or “Mid” or “Low” fixation by “PRI SPEED” and “VEHICLE SPEED” on “DATA MONITOR MODE”.
• If hi-geared fixation occurred, go to CVT-316, " Diagnosis Procedure " .
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESU LTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MO NITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Make sure that output voltage of CVT fluid temperature sensor is within the range below.
ATF TEMP SEN: 1.0 - 2.0 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to
increase the voltage (c ool down the fluid)
3. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
4. Start engine and maintain the following conditions for at least 30 consecutive seconds.
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION: Keep 30 sec or more
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
ENG SPEED: 450 rpm or more
5. If DTC is detected, go to CVT-316, " Diagnosis Procedure " .
WITH GST
Follow the procedure “WITH CONSULT-III”. Item name Condition Display value (Approx.)
STM STEP During driving−
20 step - 180 step
GEAR RATIO 2.56 - 0.43

Component " .
3. Disconnect primary speed sensor connector.
4. Remove primary speed sensor.
5. Remove O-ring from primary speed sensor.
INSTALLATION
Note the following, and install in the reverse order of removal.
CAUTION:
• Never reuse O-ring.
• Apply CVT fluid to O-ring.
Inspection INFOID:0000000004683892
INSPECTION AFTER INSTALLATION
Check for CVT fluid leakage and check CVT fluid level. Refer to CVT-196, " Checking CVT Fluid " .
1. Primary speed sensor 2. O-ring 3. Transaxle assembly
: Apply CVT Fluid NS-2.