2009 NISSAN LATIO check engine

CVT
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DTC P1723 CVT SPEED SENSOR FUNCTION
Description INFOID:0000000004667046
• 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:0000000004667047
• 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:0000000004667048
• 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:0000000004667049
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-133, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004667050CONSULT-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-145 .)
NO >> GO TO 2.
2. CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR SYSTEM) AND INPUT SPEED ,
CVT-80 .

CVT
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DTC P1726 ELECTRIC TH
ROTTLE CONTROL SYSTEM
Description INFOID:0000000004667051
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:0000000004667052
• 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:0000000004667053
Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation Procedure INFOID:0000000004667054
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-135, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004667055 CONSULT-III
Function (ENGINE) " .
OK or NG OK >> GO TO 2.
NG >> Check the DTC Detected Item. Refer to EC-604, " CONSULT-III F
unction (ENGINE) " .
• If CAN communication line is detected, go to CVT-60 .
DTC Confirmation Procedure " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 3. OK >> Replace TCM. Refer to
CVT-12, " Service After Replacing TCM and Transaxle Assembly " .
NG >> Repair or replace damaged parts.

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-185, " Vehicle Speed When Shifting Gears " .
OK or NG OK >>
INSPECTION END
NG >> Replace the transaxle assembly. Refer to CVT-182, " Removal and Installation " .

CVT
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Check again. Refer to
CVT-45, " Check before Engine Is Started " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 7. OK or NG
OK >>
INSPECTION END
NG >> Repair or replace damaged parts.
Engine Cannot Be Starte d in "P" and "N" Position INFOID:0000000004667093
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 CONSULT-III Functi
on (TRANSMISSION) " .
Do the self-diagnostic results indicate PNP switch circuit or start signal circuit? YES >> Check PNP switch circuit or start signal circuit. Refer to
CVT-69 or
CVT-64 .
NO >> GO TO 2. Checking of CVT Position "
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-175, " Adjustment of CVT Position " .
.
OK or NG OK >>
INSPECTION END
NG >> Repair or replace damaged parts.
In "P" Position, Vehicle Moves Forward or Backward When Pushed INFOID:0000000004667094
SYMPTOM: Vehicle moves when it is pushed forward or backward with selector lever in “P” position.
DIAGNOSTIC PROCEDURE CONSULT-III Functi
on (TRANSMISSION) " .
Do the self-diagnostic results indicate PNP switch circuit? YES >> Check PNP switch circuit. Refer to
CVT-69 .
NO >> GO TO 2. Checking of CVT Position "
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-175, " Adjustment of CVT Position " .
Check at Idle " .

CVT
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Vehicle Speed Does Not
Change in "D" Position INFOID:0000000004667101
SYMPTOM: Vehicle speed does not change in “D” position while the cruise test.
DIAGNOSTIC PROCEDURE CONSULT-III Functi
on (TRANSMISSION) " .
Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system. Refer to
CVT-51, " CONSULT-III Function (TRANSMISSION) " .
NO >> GO TO 2. Checking of CVT Position "
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-175, " Adjustment of CVT Position " .
Checking CVT Fluid " .
OK or NG OK >> GO TO 4.
NG >> Refill CVT fluid. Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 5.
NG >> Check the malfunctioning item. Refer to CVT-40, " Inspections before Trouble Diagnosis " .
Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 6.
NG >> Check the malfunctioning item. Refer to CVT-40, " Inspections before Trouble Diagnosis " .
Cruise Test " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 7. 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 >> Replace the transaxle assembly. Refer to
CVT-182, " Removal and Installation " .
NG >> Repair or replace damaged parts.
Vehicle Does Not Decelerate by Engine Brake INFOID:0000000004667102
SYMPTOM: Engine brake does not operate when releasing the accelerator pedal while the cruise test.
DIAGNOSTIC PROCEDURE

SHIFT CONTROL SYSTEM
CVT-175
< SERVICE INFORMATION >
[RE0F08A] D
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1. Set selector lever knob (1) in “N” position.
2. Slide knob cover (2) downward.
3. Pull out lock pin (3) from selector lever knob (1).
4. Remove selector lever knob (1) and knob cover (2) as a set from selector lever.
CAUTION:
Do not push selector button.
INSTALLATION 1. Insert lock pin (1) to selector lever knob (2).
2. Install knob cover (3) to selector lever knob (2).
3. Set selector lever in “N” position.
4. Install selector lever knob onto selector lever until a click is felt. CAUTION:
• Do not tilt selector lever knob when installing. Install it
straight, and do not tap or ap ply any shock to install it.
• Do not push selector button.
Adjustment of CVT Position INFOID:0000000004667111
CAUTION:
Make sure that parking brake is applied before adjustment.
1. Loosen the control cable nut (A) and place the manual lever (1) in “P” position.
2. Place selector lever in “P” position.
3. Push the control cable (2) in with a load of 9.8 N (approximately 1 kg, 2.2 lb). Release the control cable and temporarily tighten
the control cable nut.
NOTE:
Do not move the manual lever. Make sure the manual lever
stays in the “P” position.
4. Tighten the control cable nut. CAUTION:
Secure the manual lever when tightening nut.
5. Check the operation of the CVT. Refer to CVT-175, " Checking of CVT Position " .
Checking of CVT Position INFOID:0000000004667112
1. Place selector lever in “P” position, and tu rn ignition switch ON. (Do not start engine.)
2. Make sure selector lever can be shifted to other than “P” position when brake pedal is depressed. Also
make sure selector lever can be shifted from “P” position only when brake pedal is depressed.
3. Move the selector lever and check for excessive effort, sticking, noise or rattle.
4. Confirm the selector lever stops at each position with the feel of engagement when it is moved through all
the positions. Check that t he actual position of the selector lever matches the position shown by the shift
position indicator and the manual lever on the transaxle. SCIA6971E
SCIA6972E
Control cable nut: Refer to
CVT-171, " Removal
and Installation " . WCIA0608E

TRANSAXLE ASSEMBLY
CVT-183
< SERVICE INFORMATION >
[RE0F08A] D
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4. Remove the four drive plate to torque converter nuts.
NOTE:
Rotate the crankshaft clockwise as viewed from front of engine
for access to drive plate to torque converter nuts.
5. Put matching marks on the drive plate and torque converter alignment stud. CAUTION:
For matching marks, use paint. Never dama ge the drive plate or torque converter.
6. Remove the transaxle to engine and engine to transaxle bolts.
7. Separate the transaxle from the engine.
8. If necessary, remove the following from the transaxle: • CVT fluid charging pipe
• Engine mounting bracket (LH)
• Fluid cooler tubes
• Air breather hose
• Any necessary brackets
INSTALLATION Installation is in the reverse order of removal.
CAUTION:
• When replacing an engine or transmission you mu st make sure any dowels are installed correctly
during re-assembly.
• Improper alignment caused by missing dowels m ay cause vibration, oil leaks or breakage of drive
train components.
• Do not reuse O-rings and copper washers.
• When turning crankshaft, turn it clockwise as viewed from the front of the engine.
• When tightening the nuts for the torque converter while securing the crankshaft pulley bolt, be sure
to confirm the tightening torque of the crankshaft pulley bolt. Refer to EM-160 .
• After converter is installed to drive plate, ro tate crankshaft several turns to check that transaxle
rotates freely without binding.
• When installing the torque converter to the transaxle measure dis- tance A. WCIA0616E
Distance A: 14.4 mm (0.57 in) or more
WCIA0617E

CVT-184< SERVICE INFORMATION >
[RE0F08A]
TRANSAXLE ASSEMBLY
• When installing the cooler outlet tube (1) to the transaxle assembly (2), align the cooler tube bracket (A) against the transaxle as
shown.
• When installing the transaxle to the engine, align t he matching mark on the drive plate with the matching
mark on the torque converter alignment stud.
• When securing the transaxle to the engine, attach the bolts in
accordance with the following standard.
• When installing the drive plate to torque converter nuts, tighten them temporarily. Then tighten the nuts to the specified torque.
• After completing installation check for fluid level, fluid leakage, and the positions of CVT. Refer to CVT-17," Checking CVT Fluid " ,
CVT-175, " Adjustment of CVT Position " and
CVT-175, " Checking of CVT Position " .
• When replacing the CVT assembly, erase EEP ROM in TCM. Refer to CVT-12, " Service After Replacing
TCM and Transaxle Assembly " . WCIA0618E
Bolt No. 1 (Transaxle to engine) 2 (Engine to transaxle)
Number of bolts 2 7
Bolt length
“A” mm (in) 55 (2.17) 50 (1.97)
Tightening torque
N·m (kg-m, ft-lb) 62 (6.3, 46) WCIA0619E
Converter nuts: : 51 N·m (5.2 kg-m, 38 ft-lb)
WCIA0616E