2008 NISSAN LATIO Service Repair Manual

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Page 945 of 2771

NISSAN LATIO 2008 Service Repair Manual CVT-106
< SERVICE INFORMATION >
DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRES-
SURE SOLENOID VALVE)
Diagnosis Procedure
INFOID:0000000001703571
1. CHECK INPUT SIGNAL
With CONSULT-III
1. S

Page 946 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRES-
SURE SOLENOID VALVE)
CVT-107
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
3. Check resistance between CVT unit harness connector

Page 947 of 2771

NISSAN LATIO 2008 Service Repair Manual CVT-108
< SERVICE INFORMATION >
DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRES-
SURE SOLENOID VALVE)
3. Check resistance between CVT unit harness connector terminal
and ground.
4. If NG, r

Page 948 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
CVT-109
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT
(S

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
CVT-109
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT
(SEC PRESSURE SENSOR)
DescriptionINFOID:0000000001703573
• 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-III Reference Value in Data Monitor ModeINFOID:0000000001703574
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703575
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0840 TR PRS SENS/A CIRC” with CONSULT-III is detected when TCM detects
an improper voltage drop when it receives the sensor signal.
Possible CauseINFOID:0000000001703576
• Transmission fluid pressure sensor A (Secondary pressure sensor)
• Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000001703577
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-III
1. Turn ignition switch ON and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
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-111, "
Diagnosis Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-III”.
Item name Condition Display value (Approx.)
SEC HYDR SEN
“N” position idle1.0 V
SEC PRESS0.8 MPa

Page 949 of 2771

NISSAN LATIO 2008 Service Repair Manual CVT-110
< SERVICE INFORMATION >
DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
Wiring Diagram - CVT - SECPS
INFOID:0000000001703578
TCM TERMINALS AND REFERENCE VALUES
Re

Page 950 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
CVT-111
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
Diagnosis ProcedureINFOID:0000000001703579
1.CHECK INPUT

Page 951 of 2771

NISSAN LATIO 2008 Service Repair Manual CVT-112
< SERVICE INFORMATION >
DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
OK >> Replace TCM. Refer to CVT-8, "Service After Replacing TCM and Transaxle Assembl

Page 952 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P0841 PRESSURE SENSOR FUNCTION
CVT-113
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
DTC P0841 PRESSURE SENSOR FUNCTION
DescriptionINFOID:0000000001703580
Using the engine load (throttl

DTC P0841 PRESSURE SENSOR FUNCTION
CVT-113
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
DTC P0841 PRESSURE SENSOR FUNCTION
DescriptionINFOID:0000000001703580
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-III Reference Value in Data Monitor ModeINFOID:0000000001703581
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703582
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0841 PRESS SEN/FNCTN” with CONSULT-III is detected when correlation
between the values of the secondary pressure sensor and the primary pressure sensor is out of specifica-
tion.
Possible CauseINFOID:0000000001703583
• 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 ProcedureINFOID:0000000001703584
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-III
1. Turn ignition switch ON and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
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-113, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001703585
1.CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to CVT-47, "
CONSULT-III Function (TRANSMISSION)".
Is any malfunction of the
“U1000 CAN COMM CIRCUIT” indicated?
YES >> Check CAN communication line. Refer to CVT-56.
NO >> GO TO 2.
2.CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start vehicle and read out the value of “SEC HYDR SEN” and “PRI HYDR SEN”.
Item name Condition Display value (Approx.)
PRI HYDR SEN
“N” position idle0.7 V
SEC HYDR SEN1.0 V

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