check engine NISSAN LATIO 2007 Service Repair Manual

DTC P1723 CVT SPEED SENSOR FUNCTION
CVT-155
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Revision: June 20062007 Versa
Diagnostic ProcedureUCS0062Z
1. CHECK STEP MOTOR FUNCTION
Perform the self-diagnosis check. Refer to CVT-60, "
SELF-DIAGNOSTIC RESULT MODE" .
Is a malfunction in the step motor function indicated in the results?
YES >> Repair or replace damaged parts. (Check the step motor function. Refer to CVT-168, "DTC P1778
STEP MOTOR - FUNCTION" .)
NO >> GO TO 2.
2. CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR SYSTEM) AND INPUT SPEED
SENSOR (PRIMARY SPEED SENSOR) SYSTEM
Check output speed sensor (secondary speed sensor) system and input speed sensor (primary speed sensor)
system. Refer to CVT-95, "
DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)" ,
CVT-90, "
DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. CHECK ENGINE SPEED SIGNAL SYSTEM
Check engine speed signal system. Refer to CVT-101, "
DTC P0725 ENGINE SPEED SIGNAL" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts. Refer to EC-576, "
IGNITION SIGNAL" .
4. DETECT MALFUNCTIONING ITEM
Check the following:

Power supply and ground circuit for TCM. Refer to CVT-145, "DTC P1701 TRANSMISSION CONTROL
MODULE (POWER SUPPLY)" .

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-154, "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> Replace TCM or transaxle assembly. Refer to CVT-9, "
Service After Replacing TCM and Tran-
saxle Assembly" , CVT-207, "Removal and Installation" .

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM
CVT-157
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CVT
Revision: June 20062007 Versa
Diagnostic ProcedureUCS00634
1. CHECK DTC WITH ECM
With CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “ENGINE” with CON-
SULT-II. Refer to EC-116, "
SELF-DIAG RESULTS MODE" .
OK or NG
OK >> GO TO 2.
NG >> Check the DTC Detected Item. Refer to EC-116, "
SELF-
DIAG RESULTS MODE" .

If CAN communication line is detected, go to CVT-68,
"DTC U1000 CAN COMMUNICATION LINE" .
2. CHECK DTC
Perform CVT-156, "
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-9, "Service After Replacing TCM and Transaxle Assembly" .
NG >> Repair or replace damaged parts.
BCIA0030E

DTC P1745 LINE PRESSURE CONTROL
CVT-163
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CVT
Revision: June 20062007 Versa
DTC P1745 LINE PRESSURE CONTROLPFP:31036
DescriptionUCS0063D
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.
On Board Diagnosis LogicUCS0063E

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code “P1745 L/PRESS CONTROL” with CONSULT-II is detected when TCM detects
the unexpected line pressure.
Possible CauseUCS0063F
TCM
DTC Confirmation ProcedureUCS0063G
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-II
1. Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
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-163, "
Diagnostic Procedure" .
Diagnostic ProcedureUCS0063H
1. CHECK DTC
1. Turn ignition switch ON. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “TRANSMISSION” with CONSULT-II.
3. Erase self-diagnostic results. Refer to CVT-63, "
How to Erase Self-diagnostic Results" .
4. Turn ignition switch OFF, and wait for 10 seconds or more.
5. Start engine.
6. Confirm self-diagnostic results again. Refer to CVT-60, "
SELF-DIAGNOSTIC RESULT MODE" .
Is the
“P1745 L/PRESS CONTROL” displayed?
YES >> Replace TCM. Refer to CVT-9, "Service After Replacing TCM and Transaxle Assembly" .
NO >>INSPECTION END
BCIA0031E

CVT-166
DTC P1777 STEP MOTOR - CIRCUIT
Revision: June 20062007 Versa
TCM terminals data are reference values, measured between each terminal and ground.
Diagnostic ProcedureUCS0063O
1. CHECK INPUT SIGNALS
With CONSULT-II
1. Start engine.
2. Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “TRANSMISSION” with CONSULT-II.
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.
Terminal Wire color Item Condition Data (Approx.)
11 L Step motor A Within 2 seconds after ignition switch ON, the time measure-
ment by using the pulse width measurement function (Hi level)
of CONSULT-II.*1
CAUTION:
Connect the diagnosis data link cable to the vehicle diag-
nosis connector.
*1: A circuit tester cannot be used to test this item.30.0 msec
12 Y Step motor B10.0 msec
20 W Step motor C30.0 msec
21 P Step motor D10.0 msec
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
SCIA4516E
Item Connector Terminal Continuity
TCM E31 11
Ye s
CVT unit harness connector F46 6
TCM E31 12
Ye s
CVT unit harness connector F46 7
TCM E31 20
Ye s
CVT unit harness connector F46 8
TCM E31 21
Ye s
CVT unit harness connector F46 9
SCIA4695E

DTC P1778 STEP MOTOR - FUNCTION
CVT-169
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CVT
Revision: June 20062007 Versa
WITH GST
Follow the procedure “WITH CONSULT-II”.
Diagnostic ProcedureUCS0063V
1. CHECK STEP MOTOR
With CONSULT-II
It is monitoring whether “GEAR RATIO: 2.56 - 0.43” changes similarly to “STM STEP: −20 - 180” by DATA
MONITOR mode. Refer to CVT-64, "
DATA MONITOR MODE" .
Without CONSULT-II
Inspect the engine speed (rise and descend), vehicle speed, throttle position, and check shift change. Refer to
CVT-210, "
Vehicle Speed When Shifting Gears" .
OK or NG
OK >>INSPECTION END
NG >> Replace the transaxle assembly. Refer to CVT-207, "
Removal and Installation" .

SHIFT POSITION INDICATOR CIRCUIT
CVT-175
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Revision: June 20062007 Versa
SHIFT POSITION INDICATOR CIRCUITPFP:24810
DescriptionUCS006XJ
TCM sends the switch signals to combination meter via CAN communication line. Then selector lever position
is indicated on the shift position indicator.
CONSULT-II Reference ValueUCS00642
Diagnostic ProcedureUCS00643
1. CHECK INPUT SIGNALS
With CONSULT-II
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-II and read
out the value of “RANGE”.
3. Check that the following three positions or indicators are same.
–Actual position of the selector lever
–“RANGE” on CONSULT-II 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
RANGESelector 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.Park/neutral position switch

Refer to CVT-78, "DTC P0705 PARK/NEUTRAL POSITION
SWITCH" .
CVT main system (Fail-safe function actuated)

Refer to CVT-60, "SELF-DIAGNOSTIC RESULT MODE" .
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-60, "SELF-DIAGNOSTIC RESULT MODE" and
DI-5, "
COMBINATION METERS" . Actual position changes, but the shift position indicator in the
combination 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-5, "COMBINATION METERS" .

TROUBLE DIAGNOSIS FOR SYMPTOMS
CVT-181
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Revision: June 20062007 Versa
5. DETECT MALFUNCTIONING ITEM
Check the following.

Harness and fuse for short or open between ignition switch and O/D OFF indicator lamp
Refer to PG-4, "
POWER SUPPLY ROUTING CIRCUIT" .
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6. CHECK SYMPTOM
Check again. Refer to CVT-49, "
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-5, "
COMBINATION METERS"
OK or NG
OK >>INSPECTION END
NG >> Repair or replace damaged parts.
Engine Cannot Be Started in “P” and “N” PositionUCS00646
SYMPTOM:

Engine cannot be started with selector 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-60, "
SELF-DIAGNOSTIC RESULT MODE" .
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-78, "DTC P0705 PARK/NEUTRAL
POSITION SWITCH" or CVT-72, "DTC P0615 START SIGNAL CIRCUIT" .
NO >> GO TO 2.
2. CHECK CVT POSITION
Check CVT position. Refer to CVT-196, "
Checking of CVT Position"
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-195, "
Adjustment of CVT Position" .
3. CHECK STARTING SYSTEM
Check starting system. Refer to SC-10, "
STARTING SYSTEM" .
OK or NG
OK >>INSPECTION END
NG >> Repair or replace damaged parts.

TROUBLE DIAGNOSIS FOR SYMPTOMS
CVT-183
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CVT
Revision: June 20062007 Versa
5. CHECK TCM
1. Check TCM input/output signals. Refer to CVT-54, "
TCM Input/Output Signal Reference Values" .
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-207, "Removal and Installation" .
NG >> Repair or replace damaged parts.
Large Shock “N” → “R” PositionUCS00649
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-60, "
SELF-DIAGNOSTIC RESULT MODE" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-61, "Display Items List" .
NO >> GO TO 2.
2. CHECK ENGINE IDLE SPEED
Check the engine idle speed. Refer to EC-75, "
Idle Speed and Ignition Timing Check" .
OK or NG
OK >> GO TO 3.
NG >> Repair.
3. CHECK CVT FLUID LEVEL
Check CVT fluid level. Refer to CVT-16, "
Checking CVT Fluid" .
OK or NG
OK >> GO TO 4.
NG >> Refill CVT fluid.
4. CHECK LINE PRESSURE
Check line pressure at idle. Refer to CVT-45, "
LINE PRESSURE TEST" .
OK or NG
OK >> GO TO 5.
NG >> Check the malfunctioning item. Refer to CVT-46, "
Judgement of Line Pressure Test" .
5. SYMPTOM CHECK
Check again. Refer to CVT-49, "
Check at Idle" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 6.
6. CHECK TCM
1. Check TCM input/output signals. Refer to CVT-54, "
TCM Input/Output Signal Reference Values" .
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-207, "Removal and Installation" .
NG >> Repair or replace damaged parts.

TROUBLE DIAGNOSIS FOR SYMPTOMS
CVT-189
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Revision: June 20062007 Versa
Vehicle Does Not Decelerate by Engine BrakeUCS0064H
SYMPTOM:
Engine brake does not operate when releasing the accelerator pedal while the cruise test.
DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis check. Refer to CVT-60, "
SELF-DIAGNOSTIC RESULT MODE" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system. Refer to CVT-61, "Display Items List" .
NO >> GO TO 2.
2. CHECK CVT POSITION
Check CVT position. Refer to CVT-196, "
Checking of CVT Position"
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-195, "
Adjustment of CVT Position" .
3. CHECK CVT FLUID LEVEL
Check CVT fluid level. Refer to CVT-16, "
Checking CVT Fluid" .
OK or NG
OK >> GO TO 4.
NG >> Refill CVT fluid.
4. CHECK LINE PRESSURE
Check line pressure at idle. Refer to CVT-45, "
LINE PRESSURE TEST" .
OK or NG
OK >> GO TO 5.
NG >> Check the malfunctioning item. Refer to CVT-46, "
Judgement of Line Pressure Test" .
5. CHECK SYMPTOM
Check again. Refer to CVT-50, "
Cruise Test" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 6.
6. CHECK TCM
1. Check TCM input/output signals. Refer to CVT-54, "
TCM Input/Output Signal Reference Values" .
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-207, "Removal and Installation" .
NG >> Repair or replace damaged parts.

CVT-196
SHIFT CONTROL SYSTEM
Revision: June 20062007 Versa
Checking of CVT PositionUCS0064K
1. Place selector lever in “P” position, and turn 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 the actual position of the selector lever matches the position shown by the shift
position indicator and the manual lever on the transaxle.
5. The method of operating the selector lever to individual posi-
tions correctly should be as shown.

(A): Press selector button to operate selector lever, while
depressing the brake pedal.

(B): Press selector button to operate selector lever.

(C): Selector lever can be operated without pressing selector
button.
6. Confirm the back-up lamps illuminate only when selector lever is
placed in the “R” position. Confirm the back-up lamps do not illu-
minate when the selector lever is pushed toward the “R” position
side with the gear position remained in the “P” or “N” position.
7. Confirm the engine can only be started with the selector lever in the “P” and “N” positions.
8. Make sure transaxle is locked completely in “P” position.
WCIA0620E