NISSAN LATIO 2009 Service Repair Manual

DTC P1740 LOCK-UP SELECT
SOLENOID VALVE CIRCUIT
CVT-307
< SERVICE INFORMATION >
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Wiring Diagram - CVT - L/USSV
INFOID:0000000004305769
TCM TERMINALS AND REFERENCE VALUES Refer to CVT-228, " TCM Terminal and Reference Value " . BCWA0680E

CVT-308< SERVICE INFORMATION >
[RE0F08B]
DTC P1740 LOCK-UP SELECT
SOLENOID VALVE CIRCUIT
Diagnosis Procedure INFOID:00000000043057701.
CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch ON.
2. Select “SELECTION FROM MENU” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
3. Read out the value of “LUSEL SOL OUT”.
Without CONSULT-III
1. Turn ignition switch ON.
2. Check voltage between TCM connector terminal and ground.
3. Turn ignition switch OFF.
4. Disconnect the 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 LOCK-UP SELECT 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
LUSEL SOL OUT Selector lever in “P” and “N”
positions ON
Wait at least for 5 seconds
with the selector lever in
“R”, “D” and “L” positions OFF
Name Connector Terminal Condition Voltage
(Approx.)
Lock-up
select sole-
noid valve E31 4 - Ground Selector lever in “P” and
“N” positions Battery
voltage
Wait at least for 5 sec-
onds with the selector le-
ver in “R”, “D” and “L”
positions 0 V SCIA7955E
Solenoid valve Connector Terminal
Resistance (Ap-
prox.)
Lock-up select solenoid
valve E31 4 - Ground 6 - 19
Ω SCIA4692E

DTC P1740 LOCK-UP SELECT
SOLENOID VALVE CIRCUIT
CVT-309
< SERVICE INFORMATION >
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3. Check resistance between CVT unit harness connector terminal
and ground.
OK or NG OK >> GO TO 4.
NG >> Replace the transaxle assembly. Refer to CVT-354," Removal and Installation " .
4.
CHECK HARNESS BETWEEN TCM AND LO CK-UP SELECT SOLENOID VALVE
1. Turn ignition switch OFF.
2. Disconnect TCM connector.
3. Check continuity between TCM connector terminal and CVT unit harness connector terminal.
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors. 5.
CHECK DTC
Perform CVT-306, " 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-228, " TCM Terminal and Reference Value " .
2. If NG, re-check TCM pin terminals for dam age or loose connection with harness connector.
OK or NG OK >>
INSPECTION END
NG >> 1. Repair or replace damaged parts.
2. Replace TCM. Refer to CVT-190, " Service After Replacing TCM and Transaxle Assembly " .
Component Inspection INFOID:0000000004305771
LOCK-UP SELECT SOLENOID VALVE 1. Turn ignition switch OFF.
2. Disconnect CVT unit harness connector.
3. Check resistance between CVT unit harness connector terminal and ground.
4. If NG, replace the transaxle assembly. Refer to CVT-354," Removal and Installation " .
Solenoid valve Connector Terminal
Resistance (Ap-
prox.)
Lock-up select solenoid valve F46 13 - Ground 6 - 19 Ω SCIA4693E
Item Connector Terminal Continuity
TCM E31 4 Yes
CVT unit harness connector F46 13 SCIA4694E
Solenoid valve Connector Terminal
Resistance (Ap-
prox.)
Lock-up select solenoid valve F46 13 - Ground 6 - 19 Ω SCIA4693E

Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004305776OBD-II Diagnostic Trouble Code (DTC) " .
4. Turn ignition switch OFF, and wait for 10 seconds or more.
5. Start engine.
6. Confirm self-diagnostic results again. Refer to CVT-230, " CONSULT-III Function (TRANSMISSION) " .
Is the “ P1745 L/PRESS CONTROL ” displayed?
YES >> Replace TCM. Refer to
CVT-190, " Service After Replacing TCM and Transaxle Assembly " .
NO >> INSPECTION END

CVT
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DTC P1777 STEP MOTOR - CIRCUIT
Description INFOID:0000000004305777
• The step motor is included in the control valve assembly.
• The step motor changes the step with turning 4 coils ON/OF F according to the signal from TCM. As a result,
the flow of line pressure to primary pu lley is changed and pulley ratio is controlled
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004305778
Remarks: Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004305779
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1777 STEP MOTR CIRC” with CONSULT-III is detected under the following con-
ditions.
- When operating step motor ON and OFF, there is no proper change in the voltage of TCM terminal which corresponds to it.
Possible Cause INFOID:0000000004305780
• Step motor
• Harness or connectors
(Step motor circuit is open or shorted.)
DTC Confirmation Procedure INFOID:0000000004305781
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. Drive vehicle for at least 5 consecutive seconds.
3. If DTC is detected, go to CVT-313, " Diagnosis Procedure " .
WITH GST
Follow the procedure “WITH CONSULT-III”. Item name Condition Display value (Approx.)
STM STEP
During driving−
20 step - 180 step
SMCOIL A
Changes ON⇔OFF.
SMCOIL B
SMCOIL C
SMCOIL D

TCM Terminal and Reference Value " . B

DTC P1777 STEP MOTOR - CIRCUIT
CVT-313
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Diagnosis Procedure
INFOID:00000000043057831.
CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select “SELECTION FROM MENU” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start vehicle and read out the value of “STM STEP”, “SMCOIL A”, “SMCOIL B”, “SMCOIL C”, and
“SMCOIL D”.
OK or NG OK >> GO TO 4.
NG >> GO TO 2. 2.
CHECK HARNESS BETWEEN TCM AND STEP MOTOR
1. Turn ignition switch OFF.
2. Disconnect CVT unit connector and TCM 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. If OK, check continuity between body ground and CVT assembly.
6. Reinstall any part removed.
OK or NG OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power in harness or connectors. 3.
CHECK STEP MOTOR
Check step motor. Refer to CVT-314, " Component Inspection " .
OK or NG OK >> GO TO 4.
NG >> Repair or replace damaged parts. 4.
CHECK DTC
Perform CVT-311, " DTC Confirmation Procedure " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 5.
Item name Condition Display value (Approx.)
STM STEP
During driving−
20 step - 180 step
SMCOIL A
Changes ON⇔OFF.
SMCOIL B
SMCOIL C
SMCOIL D Item Connector Terminal Continuity
TCM E31 11 Yes
CVT unit harness connector F46 6
TCM E31 12 Yes
CVT unit harness connector F46 7
TCM E31 20 Yes
CVT unit harness connector F46 8
TCM E31 21 Yes
CVT unit harness connector F46 9 SCIA4695E

CVT-314< SERVICE INFORMATION >
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DTC P1777 STEP MOTOR - CIRCUIT 5.
CHECK TCM
1. Check TCM input/output signals. Refer to CVT-228, " 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 >> Repair or replace damaged parts.
Component Inspection INFOID:0000000004305784
STEP MOTOR
1. Turn ignition switch OFF.
2. Disconnect CVT unit harness connector.
3. Check resistance between CVT unit harness connector termi- nals and ground.
4. If NG, replace the transaxle assembly. Refer to CVT-354, " Removal and Installation " .
Name Connector Terminal
Resistance (Ap-
prox.)
Step motor F46 6 - 7
30 Ω
8 - 9
6 - Ground
15 Ω
7 - Ground
8 - Ground
9 - Ground SCIA4696E

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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

CONSULT-III Function (TRANSMISSION) " .
Without CONSULT-III
Inspect the engine speed (rise and descend), vehicle speed, throttle position, and check shift change. Refer to
CVT-357, " Vehicle Speed When Shifting Gears " .
OK or NG OK >>
INSPECTION END
NG >> Replace the transaxle assembly. Refer to CVT-354, " Removal and Installation " .