2007 NISSAN LATIO ECO mode

CVT-126
DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRES-
SURE SOLENOID VALVE)
Revision: June 20062007 Versa
TCM terminal data are reference values, measured between each terminal and ground.
Diagnostic ProcedureUCS0061D
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
3. Read out the value of “ISOLT3”.
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM connector terminal and ground.
3. Turn ignition switch OFF.
4. Disconnect TCM connector.
5. Check if there is continuity between connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
Terminal Wire color Item Condition Data (Approx.)
2LGPressure control
solenoid valve B
(Secondary pres-
sure solenoid
valve)andRelease your foot from the accelera-
tor pedal.5.0 - 7.0 V
Press the accelerator pedal all the
way down.3.0 - 4.0 V
Item name Condition Display value (Approx.)
ISOLT3Secondary pressure low -
Secondary pressure high0.8 - 0.0 A
SCIA2349E
Name Connector Terminal ConditionVoltage
(Approx.)
Pressure
control
solenoid
valve B
(Second-
ary pres-
sure
solenoid
valve)E31 2 - groundRelease your foot from
the accelerator pedal.5.0 - 7.0 V
Press the accelerator
pedal all the way down.3.0 - 4.0 V
SCIA4506E

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
CVT-129
D
E
F
G
H
I
J
K
L
MA
B
CVT
Revision: June 20062007 Versa
DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
PFP:31936
DescriptionUCS0061N

The transmission fluid pressure sensor A (secondary pressure sensor) is included in the control valve
assembly.

The transmission fluid pressure sensor A (secondary pressure sensor) detects secondary pressure of
CVT and sends TCM the signal.
CONSULT-II Reference ValueUCS0061O
Remarks: Specification data are reference values.
On Board Diagnosis LogicUCS0061P

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0840 TR PRS SENS/A CIRC” with CONSULT-II is detected when TCM detects
an improper voltage drop when it receives the sensor signal.
Possible CauseUCS0061Q

Transmission fluid pressure sensor A (Secondary pressure sensor)

Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation ProcedureUCS0061R
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, perform the following procedure to confirm 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 line 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. Start engine and wait for at least 5 consecutive seconds.
4. If DTC is detected, go to CVT-131, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name Condition Display value (Approx.)
SEC HYDR SEN
“N” position idle1.0 V
SEC PRESS0.8 MPa
BCIA0031E

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
CVT-131
D
E
F
G
H
I
J
K
L
MA
B
CVT
Revision: June 20062007 Versa
TCM terminal data are reference values, measured between each terminal and ground.
Diagnostic ProcedureUCS0061T
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
3. Start vehicle and read out the value of “SEC HYDR SEN”.
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
Terminal Wire color Item Condition Data (Approx.)
37 LTransmission fluid
pressure sensor A
(Secondary pres-
sure sensor)and “N” position idle 1.0 V
42 LG Sensor ground Always 0 V
46 O Sensor power—5.0 V
— 0 V
Item name Condition Display value (Approx.)
SEC HYDR SEN “N” position idle 1.0 V
SCIA2279E
Name Connector Terminal ConditionVoltage
(Approx.)
Transmission
fluid pres-
sure sensor A
(Secondary
pressure sen-
sor)E32 37 - Ground “N” position idle 1.0 V
SCIA4508E

CVT-134
DTC P0841 PRESSURE SENSOR FUNCTION
Revision: June 20062007 Versa
DTC P0841 PRESSURE SENSOR FUNCTIONPFP:31936
DescriptionUCS0061U
Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolu-
tion speed as input signal, TCM changes the operating pressure of the primary pulley and the secondary pul-
ley and changes the groove width of the pulley to control the gear ratio.
CONSULT-II Reference ValueUCS0061V
Remarks: Specification data are reference values.
On Board Diagnosis LogicUCS0061W

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

Diagnostic trouble code “P0841 PRESS SEN/FNCTN” with CONSULT-II is detected when correlation
between the values of the secondary pressure sensor and the primary pressure sensor is out of specifica-
tion.
Possible CauseUCS0061X

Transmission fluid pressure sensor A (Secondary pressure sensor)

Transmission fluid pressure sensor B (Primary pressure sensor)

Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation ProcedureUCS0061Y
CAUTION:
Always drive vehicle at a safe speed.
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, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
2. Start engine and maintain the following conditions for at least 12
consecutive seconds.
VEHICLE SPEED: 40 km/h (25 MPH) More than
RANGE: “D” position
3. If DTC is detected, go to CVT-135, "
Diagnostic Procedure" .
Item name Condition Display value (Approx.)
PRI HYDR SEN
“N” position idle0.7 V
SEC HYDR SEN1.0 V
BCIA0031E

DTC P0841 PRESSURE SENSOR FUNCTION
CVT-135
D
E
F
G
H
I
J
K
L
MA
B
CVT
Revision: June 20062007 Versa
Diagnostic ProcedureUCS0061Z
1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to CVT-60, "
SELF-DIAGNOSTIC RESULT MODE" .
Is any malfunction of the
“U1000 CAN COMM CIRCUIT” indicated?
YES >> Check CAN communication line. Refer to CVT-68, "DTC U1000 CAN COMMUNICATION LINE" .
NO >> GO TO 2.
2. CHECK INPUT SIGNALS
With CONSULT-II
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
3. Start vehicle and read out the value of “SEC HYDR SEN” and
“PRI HYDR SEN”.
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM connector terminals and ground.
OK or NG
OK >> GO TO 6.
NG >> GO TO 3.
3. CHECK LINE PRESSURE
Perform line pressure test. Refer to CVT-45, "
LINE PRESSURE TEST" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts. Refer to CVT-46, "
Judgement of Line Pressure Test" .
4. CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYS-
TEM AND TRANSMISSION FLUID PRESSURE SENSOR B (PRIMARY PRESSURE SENSOR) SYSTEM
Check transmission fluid pressure sensor A (secondary pressure sensor) system and transmission fluid pres-
sure sensor B (primary pressure sensor) system. Refer to CVT-129, "
DTC P0840 TRANSMISSION FLUID
Item name Condition Display value (Approx.)
PRI HYDR SEN
“N” position idle0.7 V
SEC HYDR SEN 1.0 V
SCIA2277E
Name Connector Terminal ConditionVoltage
(Approx.)
Transmission fluid
pressure sensor B
(Primary pres-
sure sensor)
E3241 - Ground
“N” position idle0.7 V
Transmission fluid
pressure sensor A
(Secondary pres-
sure sensor)37 - Ground 1.0 V
SCIA6879E

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI
PRESSURE SENSOR)
CVT-137
D
E
F
G
H
I
J
K
L
MA
B
CVT
Revision: June 20062007 Versa
DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI PRES-
SURE SENSOR)
PFP:31936
DescriptionUCS00620

The transmission fluid pressure sensor B (primary pressure sensor) is included in the control valve
assembly.

The transmission fluid pressure sensor B (primary pressure sensor) detects primary pressure of CVT and
sends TCM the signal.
CONSULT-II Reference ValueUCS00621
Remarks: Specification data are reference values.
On Board Diagnosis LogicUCS00622

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0845 TR PRS SENS/B CIRC” with CONSULT-II is detected under the following
conditions.
–When TCM detects an improper voltage drop when it receives the sensor signal.
–When TCM compares target value with monitor value and detects an irregularity.
Possible CauseUCS00623

Transmission fluid pressure sensor B (Primary pressure sensor)

Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation ProcedureUCS00624
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, perform the following procedure to confirm 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 line 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. Start engine and wait for at least 5 consecutive seconds.
4. If DTC is detected, go to CVT-139, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name Condition Display value (Approx.)
PRI HYDR SEN “N” position idle 0.7 V
BCIA0031E

CVT-142
DTC P0868 SECONDARY PRESSURE DOWN
Revision: June 20062007 Versa
DTC P0868 SECONDARY PRESSURE DOWNPFP:31941
DescriptionUCS00627

The pressure control solenoid valve B (secondary pressure solenoid valve) is included in the control valve
assembly.

The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pres-
sure to suit the driving condition in response to a signal sent from the TCM.
CONSULT-II Reference ValueUCS00628
Remarks: Specification data are reference values.
On Board Diagnosis LogicUCS00629

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

Diagnostic trouble code “P0868 SEC/PRESS DOWN” with CONSULT-II is detected when secondary fluid
pressure is too low compared with the commanded value while driving.
Possible CauseUCS0062A

Harness or connectors
(Solenoid circuit is open or shorted.)

Pressure control solenoid valve B (Secondary pressure solenoid valve) system

Transmission fluid pressure sensor A (Secondary pressure sensor)

Line pressure control system
DTC Confirmation ProcedureUCS0062B
CAUTION:
Always drive vehicle at a safe speed.
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, perform the following procedure to confirm 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. Start engine and maintain the following conditions for at least 10
consecutive seconds.
VEHICLE SPEED (accelerate slowly): 0 → 50 km/h (31 MPH)
ACC PEDAL OPEN: 0.5/8 - 1.0/8
RANGE: “D” position
4. If DTC is detected, go to CVT-143, "
Diagnostic Procedure" .
Item name Condition Display value (Approx.)
SEC PRESS “N” position idle 0.8 MPa
BCIA0031E

DTC P0868 SECONDARY PRESSURE DOWN
CVT-143
D
E
F
G
H
I
J
K
L
MA
B
CVT
Revision: June 20062007 Versa
Diagnostic ProcedureUCS0062C
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
3. Start vehicle and read out the value of “SEC PRESS”.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2. CHECK LINE PRESSURE
Perform line pressure test. Refer to CVT-45, "
LINE PRESSURE TEST" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts. Refer to CVT-46, "
Judgement of Line Pressure Test" .
3. DETECT MALFUNCTIONING ITEM
Check the following:

Pressure control solenoid valve B (Secondary pressure solenoid valve). Refer to CVT-128, "Component
Inspection" .

Pressure control solenoid valve A (Line pressure solenoid valve). Refer to CVT-117, "Component Inspec-
tion" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYS-
TEM
Check transmission fluid pressure sensor A (secondary pressure sensor) system. Refer to CVT-129, "
DTC
P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC PRESSURE SENSOR)" .
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5. DETECT MALFUNCTIONING ITEM
Check the following:

Power supply and ground circuit for TCM. Refer to CVT-146, "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.
Item name Condition Display value (Approx.)
SEC PRESS “N” position idle 0.8 MPa
SCIA2366E