engine NISSAN LATIO 2011 Service Repair Manual

CVT-122
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P1723 SPEED SENSOR
Check engine speed signal system. Refer to
CVT-81.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts. Refer to EC-1019, "
Component Description".
4.DETECT MALFUNCTIONING ITEM
Check the following:
• Power supply and ground circuit for TCM. Refer to CVT-113
.
• The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5.CHECK DTC
Perform CVT-121, "
DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> Replace TCM or transaxle assembly. Refer to CVT-159, "
Removal and Installation", CVT-180,
"Removal and Installation".
Revision: May 2010 2011 Versa

P1726 THROTTLE CONTROL SIGNALCVT-123
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P1726 THROTTLE CONTROL SIGNAL
DescriptionINFOID:0000000005928905
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 LogicINFOID:0000000005928906
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1726” with CONS ULT-III is detected when the electronically controlled throttle for
ECM is malfunctioning.
Possible CauseINFOID:0000000005928907
Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000005928908
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 let it idle for 5 second.
4. If DTC is detected, go to CVT-123, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005928909
1.CHECK DTC WITH ECM
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “ENGINE” with CONSULT-III. Refer to EC-612, "
CONSULT-III
Function (ENGINE)".
OK or NG
OK >> GO TO 2.
NG >> Check the DTC Detected Item. Refer to EC-612, "
CONSULT-III Function (ENGINE)".
• If CAN communication line is detected, go to CVT-56
.
2.CHECK DTC
Perform CVT-123, "
DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3.DETECT MALFUNCTIONING ITEM
Check the following:
• The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace TCM. Refer to CVT-159, "Removal and Installation".
NG >> Repair or replace damaged parts.
Revision: May 2010 2011 Versa

CVT-124
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P1740 SELECT SOLENOID
P1740 SELECT SOLENOID
DescriptionINFOID:0000000005928910
• The lock-up select solenoid valve is included in the control valve assembly.
• The lock-up select solenoid valve controls lock-up clutch pressure or forward clutch pressure (reverse brake
pressure).
• When controlling lock-up clutch, the valve is turned OFF. When controlling forward clutch, it is turned ON.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000005928911
On Board Diagn osis LogicINFOID:0000000005928912
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1740” with CONSULT-III is detected under the following conditions.
- When TCM compares target value with monitor value and detects an irregularity.
Possible CauseINFOID:0000000005928913
• Lock-up select solenoid valve
• Harness or connectors
(Solenoid circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000005928914
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. (Do not start engine.)
2. Select “DATA MONITOR” mode fo r “TRANSMISSION” with CONSULT-III.
3. Start engine and maintain the following conditions for at least 5 consecutive seconds. RANGE: “D” position and “N” position
(At each time, wait for 5 seconds.)
4. If DTC is detected, go to CVT-126, "
Diagnosis Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-III”.
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
Revision: May 2010
2011 Versa

CVT-128
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P1745 LINE PRESSURE CONTROL
P1745 LINE PRESSURE CONTROL
DescriptionINFOID:0000000005928918
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in
response to a signal sent from the TCM.
On Board Diagn
osis LogicINFOID:0000000005928919
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1745” with CONSULT-III is detected when TCM detects the unexpected line pres-
sure.
Possible CauseINFOID:0000000005928920
TCM
DTC Confirmation ProcedureINFOID:0000000005928921
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. 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 (cool down the fluid)
3. If DTC is detected, go to CVT-128, "
Diagnosis Procedure" .
Diagnosis ProcedureINFOID:0000000005928922
1.CHECK DTC
1. Turn ignition switch ON. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode fo r “TRANSMISSION” with CONSULT-III.
3. Erase self-diagnostic results. Refer to CVT-27, "
OBD-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-48, "
CONSULT-III Function (TRANSMISSION)" .
Is the
“P1745” displayed?
YES >> Replace TCM. Refer to CVT-159, "Removal and Installation" .
NO >> INSPECTION END
Revision: May 2010 2011 Versa

P1777 STEP MOTORCVT-131
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Diagnosis ProcedureINFOID:0000000005928929
1.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-132, "
Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.CHECK DTC
Perform CVT-129, "
DTC Confirmation Procedure" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 5.
Item name ConditionDisplay value (Approx.)
STM STEP
During driving(−
20) - (+180) step
SMCOIL A
Changes on⇔off.
SMCOIL B
SMCOIL C
SMCOIL D
Item
Connector Terminal Continuity
TCM E3111
Ye s
CVT unit harness connector F46 6
TCM E3112
Ye s
CVT unit harness connector F46 7
TCM E3120
Ye s
CVT unit harness connector F46 8
TCM E3121
Ye s
CVT unit harness connector F46 9
SCIA4695E
Revision: May 2010 2011 Versa

P1778 STEP MOTORCVT-133
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P1778 STEP MOTOR
DescriptionINFOID:0000000005928931
• 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 ModeINFOID:0000000005928932
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000005928933
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1778” with CONSULT-III is detected under the following conditions.
- When not changing the pulley ratio according to the instruction of TCM.
Possible CauseINFOID:0000000005928934
Step motor
DTC Confirmation ProcedureINFOID:0000000005928935
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-134, "
Diagnosis Procedure".
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 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-134, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Item name Condition Display value (Approx.)
STM STEP During driving(−
20) - (+180) step
GEAR RATIO 2.56 - 0.43
Revision: May 2010 2011 Versa

CVT-134
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P1778 STEP MOTOR
Diagnosis Procedure
INFOID:0000000005928936
1.CHECK STEP MOTOR
With CONSULT-III
It is monitoring whether “GEAR RATIO: 2.56 - 0.43” changes similarly to “STM STEP: (−20) - (+180)” by DATA
MONITOR mode. Refer to CVT-48, "
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-183, "
Vehicle Speed When Shifting Gears".
OK or NG
OK >> INSPECTION END
NG >> Replace the transaxle assembly. Refer to CVT-180, "
Removal and Installation".
Revision: May 2010 2011 Versa

CVT-140
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SHIFT POSITION INDICATOR CIRCUIT
SHIFT POSITION INDICATOR CIRCUIT
DescriptionINFOID:0000000005928942
TCM sends the switch signals to combination meter vi
a CAN communication line. Then selector lever position
is indicated on the shift position indicator.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000005928943
Diagnosis ProcedureINFOID:0000000005928944
1.CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” m ode for “TRANSMISSION” with CONSULT-III and read
out the value of “RANGE”.
3. Check that the following three pos itions or indicators are same.
- Actual position of the selector lever
- “RANGE” on CONSULT-III screen
- Shift position indicator in the combination meter
OK or NG
OK >> INSPECTION END
NG >> Check the following.
SHIFT POSITION INDICATOR SYMPTOM CHART
Item name Condition Display value
RANGE Selector lever in “N
” or “P” position. N·P
Selector lever in “R” position. R
Selector lever in “D” position. D
Selector lever in “L” position. L
Items Presumed location of trouble
Actual position does not change. Transmission range switch
• Refer to
CVT-62
.
CVT main system (Fail-safe function actuated)
• Refer to CVT-48, "
CONSULT-III Function (TRANSMISSION)".
Shift position indicator in the combination meter does not indicate
any position. Perform the self-diagnosis for CVT and the combination meter.
• Refer to CVT-48, "
CONSULT-III Function (TRANSMISSION)"
and DI-4
.
Actual position changes, but the shift position indicator in the com-
bination meter does not change.
Actual position differs from the shift position indicator in the com-
bination meter.
Shift position indicator in the combination meter does not indicate
specific position only.
Check the combination meter.
• Refer to
DI-4
.
Revision: May 2010 2011 Versa

TROUBLE DIAGNOSIS FOR SYMPTOMSCVT-145
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Check again. Refer to CVT-42, "Check before Engine Is Started".
OK or NG
OK >> INSPECTION END
NG >> GO TO 7.
7.CHECK COMBINATION METERS
Check combination meters. Refer to DI-4
OK or NG
OK >>INSPECTION END
NG >> Repair or replace damaged parts.
Engine Cannot Be Starte d in "P" and "N" PositionINFOID:0000000005928947
SYMPTOM:
•Engine cannot be started with select or lever in “P” or “N” position.
• Engine can be started with selector lever in “D”, “L” or “R” position.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis check. Refer to CVT-48, "
CONSULT-III Function (TRANSMISSION)".
Do the self-diagnostic results indicate transmission range switch circuit?
YES >> Check transmission range switch circuit. Refer to CVT-62 .
NO >> GO TO 2.
2.CHECK CVT POSITION
Check CVT position. Refer to CVT-164, "
Checking of CVT Position"
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-164, "
Adjustment of CVT Position".
3.CHECK STARTING SYSTEM
Check starting system. Refer to SC-9
.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
In "P" Position, Vehicle Moves Forward or Backward When PushedINFOID:0000000005928948
SYMPTOM:
Vehicle moves when it is pushed forward or backward with selector lever in “P” position.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis check. Refer to CVT-48, "
CONSULT-III Function (TRANSMISSION)".
Do the self-diagnostic results indicate transmission range switch circuit?
YES >> Check transmission range switch circuit. Refer to CVT-62.
NO >> GO TO 2.
2.CHECK CVT POSITION
Check CVT position. Refer to CVT-164, "
Checking of CVT Position"
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-164, "
Adjustment of CVT Position".
3.CHECK SYMPTOM
Check again. Refer to CVT-42, "
Check at Idle".
Revision: May 2010 2011 Versa

CVT-146
< SERVICE INFORMATION >[RE0F08B]
TROUBLE DIAGNOSIS FOR SYMPTOMS
OK or NG
OK >>
INSPECTION END
NG >> Replace the transaxle assembly. Refer to CVT-180, "
Removal and Installation".
In "N" Position, Vehicle MovesINFOID:0000000005928949
SYMPTOM:
Vehicle moves forward or backward when selecting “N” position.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis check. Refer to CVT-48, "
CONSULT-III Function (TRANSMISSION)".
Do the self-diagnostic results indicate transmission range switch circuit?
YES >> Check transmission range switch circuit. Refer to CVT-62.
NO >> GO TO 2.
2.CHECK CVT POSITION
Check CVT position. Refer to CVT-164, "
Checking of CVT Position"
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-164, "
Adjustment of CVT Position".
3.CHECK CVT FLUID LEVEL
Check CVT fluid level. Refer to CVT-14, "
Checking CVT Fluid".
OK or NG
OK >> GO TO 4.
NG >> Refill CVT fluid.
4.CHECK SYMPTOM
Check again. Refer to CVT-42, "
Check at Idle".
OK or NG
OK >> INSPECTION END
NG >> GO TO 5.
5.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 >> Replace the transaxle assembly. Refer to CVT-180, "Removal and Installation".
NG >> Repair or replace damaged parts.
Large Shock "N" → "R" PositionINFOID:0000000005928950
SYMPTOM:
There is large shock when shifting from “N” to “R” position.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis check. Refer to CVT-48, "
CONSULT-III Function (TRANSMISSION)".
Is any malfunction detec ted by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-48, "CONSULT-III Function (TRANSMISSION)".
NO >> GO TO 2.
2.CHECK ENGINE IDLE SPEED
Check the engine idle speed. Refer to EC-578, "
Idle Speed and Ignition Timing Check".
OK or NG
Revision: May 2010 2011 Versa