engine NISSAN LATIO 2011 Service Repair Manual

P0744 TORQUE CONVERTERCVT-89
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P0744 TORQUE CONVERTER
DescriptionINFOID:0000000005928829
• The torque converter clutch solenoid valve is included in the control valve assembly.
• This malfunction is detected when the torque converter clutch does not lock-up as instructed by the TCM.
This is not only caused by electrical malfunction (cir cuits open or shorted), but also by mechanical malfunc-
tion such as control valve sticking, improper solenoid valve operation, etc.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000005928830
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000005928831
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0744” with CONSULT-III is detected under the following conditions.
- When CVT cannot perform lock-up even if electrical circuit is good.
- When TCM compares difference value with slip revolution and detects an irregularity.
Possible CauseINFOID:0000000005928832
• Torque converter clutch solenoid valve
• Hydraulic control circuit
DTC Confirmation ProcedureINFOID:0000000005928833
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” 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 condition for at least 30 seconds. ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
[Vehicle speed: Constant speed of more than 40 km/h (25 MPH)]
4. If DTC is detected go to CVT-89, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000005928834
1.CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITO R” mode for “TRANSMISSION” with CONSULT-III.
3. Start vehicle.
4. Check if there is a great difference between “E NG SPEED SIG” and “PRI SPEED SEN”. (Lock-up ON.)
Item name Condition Display value
ENG SPEED SIG Engine running Closely matches the tachometer reading.
PRI SPEED SEN During driving (lock-up ON) Approximately matche s the engine speed.
Revision: May 2010 2011 Versa

CVT-90
< SERVICE INFORMATION >[RE0F08B]
P0744 TORQUE CONVERTER
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2.CHECK LINE PRESSURE
Perform line pressure test. Refer to CVT-37, "
Inspections before Trouble Diagnosis".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts. Refer to CVT-37, "
Inspections before Trouble Diagnosis".
3.DETECT MALFUNCTIONING ITEM
Check the following:
• Torque converter clutch solenoid valve. Refer to CVT-87, "
Component Inspection".
• Lock-up select solenoid valve. Refer to CVT-127, "
Component Inspection".
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.CHECK SECONDARY SPEED SENSOR SYSTEM AND PRIMARY SPEED SENSOR SYSTEM
Check secondary speed sensor system and primary speed sensor system. Refer to CVT-76
, CVT-72.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5.CHECK DTC
Perform CVT-89, "
DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 6.
6.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-46, "
TCM Terminal and Reference Value".
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> 1. Repair or replace damaged parts. 2. Replace the transaxle assembly. Refer to CVT-180, "
Removal and Installation".
Item nameCondition Display value
ENG SPEED SIG Eng ine runningClosely matches the ta-
chometer reading.
PRI SPEED SEN During driving (lock-up ON) Approximately matches
the engine speed.
Revision: May 2010
2011 Versa

P0745 PRESSURE CONTROL SOLENOID ACVT-91
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P0745 PRESSURE CONTROL SOLENOID A
DescriptionINFOID:0000000005928835
• The line pressure solenoid valve is included in the control valve assembly.
• The line pressure solenoid valve regulates the oil pum p discharge pressure to suit the driving condition in
response to a signal sent from the TCM.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000005928836
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000005928837
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0745” with CONSULT-III is detected under the following conditions.
- TCM detects an improper voltage drop when it tries to operate the solenoid valve.
- When TCM compares target value with monitor value and detects an irregularity.
Possible CauseINFOID:0000000005928838
• Harness or connectors
(Solenoid circuit is open or shorted.)
• Line pressure solenoid valve
DTC Confirmation ProcedureINFOID:0000000005928839
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always 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 wait at least 5 seconds.
3. If DTC is detected, go to CVT-93, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Item name Condition Display value (Approx.)
ISOLT2 Release your foot from the accelerator pedal.
0.8 A
Press the accelerator pedal all the way down. 0.0 A
Revision: May 2010 2011 Versa

P0745 PRESSURE CONTROL SOLENOID ACVT-93
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Diagnosis ProcedureINFOID:0000000005928841
1. CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Read out the value of “ISOLT2”.
Without CONSULT-III
1. Start engine.
2. Check voltage between TCM connector terminal and ground.
3. Turn ignition switch OFF.
4. Disconnect TCM connector.
5. Check if there is continuity between connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2.CHECK LINE PRESSURE SOLENOID VALVE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM connector.
3. Check resistance between TCM connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 3.
3.CHECK VALVE RESISTANCE
1. Turn ignition switch OFF.
2. Disconnect CVT unit harness connector.
Item name Condition Display value (Approx.)
ISOLT2 Release your foot from the
accelerato
r pedal. 0.8 A
Press the accelerator ped-
al all the way down. 0.0 A
Name Connector Terminal
ConditionVoltage
(Approx.)
Line pres-
sure sole-
noid valve E31 1 - ground Release your foot from
the accelerator pedal. 5.0 - 7.0 V
Press the accelerator
pedal all the way down. 1.0 - 3.0 V
SCIA2348E
Solenoid valve
Connector TerminalResistance (Ap-
prox.)
Line pressure solenoid valve E31 1 - ground 3 - 9 Ω
SCIA4685E
Revision: May 2010 2011 Versa

CVT-96
< SERVICE INFORMATION >[RE0F08B]
P0746 PRESSURE CONTROL SOLENOID A
P0746 PRESSURE CONTROL SOLENOID A
DescriptionINFOID:0000000005928843
• The line pressure solenoid valve is included in the control valve assembly.
• The line pressure solenoid valve regulates the oil pum
p discharge pressure to suit the driving condition in
response to a signal sent from the TCM.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000005928844
Remarks: Specification data are reference values.
On Board Diagn osis LogicINFOID:0000000005928845
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0746” with CONSULT-III is detected under the following conditions.
- Unexpected gear ratio was detected in the LOW side due to excessively low line pressure.
Possible CauseINFOID:0000000005928846
• Line pressure control system
• Secondary speed sensor
• Primary speed sensor
DTC Confirmation ProcedureINFOID:0000000005928847
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 RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
2. Start engine and maintain the following conditions for at least 10 consecutive seconds. Test start from 0
km/h (0 MPH).
ATF TEMP SEN: 1.0 - 2.0 V
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
VEHICLE SPEED: 10 km/h (6 MPH) More than
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
3. If DTC is detected, go to CVT-96, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000005928848
1.CHECK LINE PRESSURE
Perform line pressure test. Refer to CVT-37, "
Inspections before Trouble Diagnosis".
OK or NG
OK >> GO TO 2.
NG >> Repair or replace damaged parts. Refer to CVT-37, "
Inspections before Trouble Diagnosis".
2.DETECT MALFUNCTIONING ITEM
Check line pressure solenoid valve. Refer to CVT-94, "
Component Inspection".
Item nameCondition Display value (Approx.)
PRI PRESS “N” position idle 0.4 MPa
Revision: May 2010 2011 Versa

CVT-98
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P0776 PRESSURE CONTROL SOLENOID B
P0776 PRESSURE CONTROL SOLENOID B
DescriptionINFOID:0000000005928849
• The secondary pressure solenoid valve is included in the control valve assembly.
• The secondary pressure solenoid valve regulates the secondary pressure to suit the driving condition in
response to a signal sent from the TCM.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000005928850
Remarks: Specification data are reference values.
On Board Diagn osis LogicINFOID:0000000005928851
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0776” with CONSULT-III is det ected when secondary pressure is too high or too
low compared with the commanded value while driving.
Possible CauseINFOID:0000000005928852
• Harness or connectors (Solenoid circuit is open or shorted.)
• Secondary pressure solenoid valve system
• Secondary pressure sensor
• Line pressure control system
DTC Confirmation ProcedureINFOID:0000000005928853
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 proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
2. Start engine and maintain the following conditions for at least 30 consecutive seconds.
ATF TEMP SEN: 1.0 - 2.0 V
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
VEHICLE SPEED: 10 km/h (6 MPH) More than
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
3. If DTC is detected, go to CVT-98, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000005928854
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITO R” mode for “TRANSMISSION” with CONSULT-III.
3. Start vehicle and read out the value of “SEC PRESS”.
Item name Condition Display value (Approx.)
SEC PRESS “N” position idle 0.8 MPa
Item nameConditionDisplay value (Approx.)
SEC PRESS “N” position idle 0.8 MPa
Revision: May 2010 2011 Versa

CVT-100
< SERVICE INFORMATION >[RE0F08B]
P0778 PRESSURE CONTROL SOLENOID B
P0778 PRESSURE CONTROL SOLENOID B
DescriptionINFOID:0000000005928855
• The secondary pressure solenoid valve is included in the control valve assembly.
• The secondary pressure solenoid valve regulates the oi
l pump discharge pressure to suit the driving condi-
tion in response to a signal sent from the TCM.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000005928856
Remarks: Specification data are reference values.
On Board Diagn osis LogicINFOID:0000000005928857
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0778” with CONSULT-III is detected under the following conditions.
- TCM detects an improper voltage drop when it tries to operate the solenoid valve.
- When TCM compares target value with monitor value and detects an irregularity.
Possible CauseINFOID:0000000005928858
• Harness or connectors (Solenoid circuit is open or shorted.)
• Secondary pressure solenoid valve
DTC Confirmation ProcedureINFOID:0000000005928859
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 proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start engine and wait at least 5 seconds.
4. If DTC is detected, go to CVT-102, "
Diagnosis Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-III”.
Item name Condition Display value (Approx.)
ISOLT3 Secondary pressure low - Secondary pressure high 0.8 - 0.0 A
SOLMON3 “N” position idle
0.6 - 0.7 A
When stalled 0.4 - 0.6 A
Revision: May 2010 2011 Versa

CVT-102
< SERVICE INFORMATION >[RE0F08B]
P0778 PRESSURE CONTROL SOLENOID B
Diagnosis Procedure
INFOID:0000000005928861
1. CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITO R” mode for “TRANSMISSION” with CONSULT-III.
3. Read out the value of “ISOLT3”.
Without CONSULT-III
1. Start engine.
2. Check voltage between TCM connector terminal and ground.
3. Turn ignition switch OFF.
4. Disconnect TCM connector.
5. Check if there is continuity between connector terminal and
ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2.CHECK SECONDARY PRESSURE SOLENOID VALVE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM connector.
3. Check resistance between TCM connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 3.
3.CHECK VALVE RESISTANCE
1. Turn ignition switch OFF.
2. Disconnect CVT unit harness connector.
Item name Condition Display value (Approx.)
ISOLT3 Secondary pressure low -
Secondary pressure high 0.8 - 0.0 A
Name Connector Terminal
ConditionVoltage
(Approx.)
Secondary
pressure
solenoid
valve E31 2 - ground Release your foot from
the accelerator pedal. 5.0 - 7.0 V
Press the accelerator
pedal all the way down. 3.0 - 4.0 V
SCIA4506E
Solenoid valve Connector Terminal Resistance (Ap-
prox.)
Secondary pressure sole-
noid valve E31 2 - Ground 3 - 9
Ω
SCIA4507E
Revision: May 2010 2011 Versa

P0840 TRANSMISSION FLUID PRESSURE SEN/SW ACVT-105
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P0840 TRANSMISSION FLUI D PRESSURE SEN/SW A
DescriptionINFOID:0000000005928863
• The secondary pressure sensor is included in the control valve assembly.
• The secondary pressure sensor detects secondar y pressure of CVT and sends TCM the signal.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000005928864
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000005928865
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0840” with CONSULT-III is detected when TCM detects an improper voltage drop
when it receives the sensor signal.
Possible CauseINFOID:0000000005928866
• Secondary pressure sensor
• Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000005928867
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always 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 line 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 wait for at least 5 consecutive seconds.
4. If DTC is detected, go to CVT-107, "
Diagnosis Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-III”.
Item name Condition Display value (Approx.)
SEC HYDR SEN “N” position idle 1.0 V
SEC PRESS 0.8 MPa
Revision: May 2010 2011 Versa

P0840 TRANSMISSION FLUID PRESSURE SEN/SW ACVT-107
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Diagnosis ProcedureINFOID:0000000005928869
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITO R” mode for “TRANSMISSION” with CONSULT-III.
3. Start vehicle and read out the value of “SEC HYDR SEN”.
Without CONSULT-III
1. Start engine.
2. Check voltage between TCM connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2.CHECK SENSOR POWER AND SENSOR GROUND
1. Turn ignition switch ON. (Do not start engine)
2. Check voltage between TCM connector terminals.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. CHECK HARNESS BETWEEN TCM AND CVT UNIT HARNESS CONNECTOR (SENSOR POWER AND
SENSOR GROUND) 1. Turn ignition switch OFF.
2. Disconnect TCM connector and CVT unit harness connector.
3. Check continuity between TCM connector terminals and CVT unit harness connector terminals.
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK >> Replace TCM. Refer to CVT-159, "Removal and Installation" .
Item nameConditionDisplay value (Approx.)
SEC HYDR SEN “N” position idle1.0 V
Name Connector Terminal Condition Voltage
(Approx.)
Secondary
pressure sen-
sor E32 37 - Ground “N” position idle 1.0 V
SCIA4508E
Item
Connector Terminal Data (Ap-
prox.)
TCM connector E3246 - 42 5.0 V
SCIA2367E
Item Connector Terminal Continuity
TCM E3242
Ye s
CVT unit harness connector F46 19
TCM E3246
Ye s
CVT unit harness connector F46 20
SCIA4681E
Revision: May 2010 2011 Versa