NISSAN LATIO 2009 Service Repair Manual

CVT
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DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
Description INFOID:0000000004666968
• 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 Mode INFOID:0000000004666969
Remarks: Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004666970
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0744 A/T TCC S/V FNCTN” wit h 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 Cause INFOID:0000000004666971
• Torque converter clutch solenoid valve
• Hydraulic control circuit
DTC Confirmation Procedure INFOID:0000000004666972
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 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-97, " Diagnosis Procedure " .
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis Procedure INFOID:0000000004666973

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-40, " Inspections before Trouble Diagnosis " .
Component Inspection " .
• Lock-up select solenoid valve. Refer to CVT-139, " Component Inspection " .
OK or NG OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) SYSTEM AND INPUT SPEED ,
CVT-80 .
OK or NG OK >> GO TO 5.
NG >> Repair or replace damaged parts. DTC Confirmation Procedure " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 6. 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-182, " Removal and Installation " .
Item name Condition 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.

CVT
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DTC P0745 LINE PRESSURE SOLENOID VALVE
Description INFOID:0000000004666974
• The pressure control solenoid valve A (line pressure solenoid valve) is included in the control valve assem- bly.
• The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge 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:0000000004666975
Remarks: Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004666976
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0745 L/PRESS SOL/CIRC” 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 Cause INFOID:0000000004666977
• Harness or connectors (Solenoid circuit is open or shorted.)
• Pressure control solenoid valve A (Line pressure solenoid valve)
DTC Confirmation Procedure INFOID:0000000004666978
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 wait at least 5 seconds.
3. If DTC is detected, go to CVT-101, " 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

TCM Terminal and Reference Value " .

CVT
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Diagnosis Procedure
INFOID:0000000004666980 OK >> GO TO 5.
NG >> GO TO 2. OK >> GO TO 5.
NG >> GO TO 3. Name Connector Terminal Condition
Voltage
(Approx.)
Pressure
control so-
lenoid
valve A
(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

OK >> GO TO 4.
NG >> Replace the transaxle assembly. Refer to CVT-182," Removal and Installation " .
4. CHECK HARNESS BETWEEN TCM AND PRESSURE CONTROL SOLENOID VALVE A (LINE PRES-OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors. DTC Confirmation Procedure " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 6. 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-182, " Removal and Installation " .
Component Inspection INFOID:0000000004666981
PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)
1. Turn ignition switch OFF.
2. Disconnect CVT unit harness connector. Solenoid valve Connector Terminal
Resistance (Ap-
prox.)
Pressure control solenoid valve A
(Line pressure solenoid valve) F46 2 - Ground 3 - 9
Ω

DTC P0745 LINE PRESSURE SOLENOID VALVE
CVT-103
< SERVICE INFORMATION >
[RE0F08A] D
E
F
G H
I
J
K L
M A
B CVT
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3. Check resistance between CVT unit harness connector terminal
and ground.
4. If NG, replace the transaxle assembly. Refer to CVT-182," Removal and Installation " .
Solenoid valve Connector Terminal
Resistance (Ap-
prox.)
Pressure control solenoid valve A
(Line pressure solenoid valve) F46 2 - Ground 3 - 9
Ω SCIA4686E

Diagnosis Procedure " .
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis Procedure INFOID:0000000004666987

CVT
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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. Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 3.
NG >> Repair or replace damaged parts. Refer to CVT-40, " Inspections before Trouble Diagnosis " .
Component
Inspection " .
OK or NG OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) SYSTEM AND INPUT SPEED ,
CVT-80 .
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 or TCM. Refer to CVT-182, " Removal and Installation " .
Item name Condition Display value (Approx.)
PRI PRESS “N” position idle. 0.8 A Name Connector Terminal Condition
Voltage
(Approx.)
Transmission
fluid pressure
sensor B (Pri-
mary pres-
sure sensor) E32 41 - ground “N” position idle. 0.7 V

Diagnosis Procedure " .
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis Procedure INFOID:0000000004666993