Nissan Cube. Manual — part 970
TM-136
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F08B]
P0778 PRESSURE CONTROL SOLENOID B
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-40, "Intermittent Incident"
.
NO
>> GO TO 2.
2.
CHECK SECONDARY PRESSURE SOLENOID VALVE
1.
Disconnect CVT unit harness connector.
2.
Check secondary pressure solenoid valve. Refer to
TM-136, "Component Inspection (Secondary Pres-
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Secondary pressure solenoid valve is malfunctioning. Replace transaxle assembly. Refer to
3.
CHECK HARNESS BETWEEN TCM AND CVT UNIT SECONDARY PRESSURE SOLENOID VALVE)
(PART 1)
1.
Disconnect TCM connector.
2.
Check continuity between TCM vehicle side harness connector terminal and CVT unit vehicle side har-
ness connector terminal.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
CHECK HARNESS BETWEEN TCM AND CVT UNIT (SECONDARY PRESSURE SOLENOID VALVE)
(PART 2)
Check continuity between TCM vehicle side harness connector terminal and ground.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-40, "Intermittent Incident"
.
NO
>> Repair or replace damaged parts.
Component Inspection (Secondary Pressure Solenoid Valve)
INFOID:0000000009948998
1.
CHECK SECONDARY PRESSURE SOLENOID VALVE
Check resistance between CVT unit harness connector terminal and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Secondary pressure solenoid valve is malfunctioning. Replace transaxle assembly. Refer to
TCM vehicle side harness connector
CVT unit vehicle side harness connector
Continuity
Connector
Terminal
Connector
Terminal
E18
2
F24
3
Existed
TCM vehicle side harness connector
Ground
Continuity
Connector
Terminal
E18
2
Not existed
CVT unit harness connector
Ground
Condition
Resistance (Approx.)
Connector
Terminal
F24
3
CVT fluid temperature: 20
°
C (68
°
F)
5.60 – 6.60
Ω
CVT fluid temperature: 50
°
C (122
°
F)
6.76 – 6.87
Ω
CVT fluid temperature: 80
°
C (176
°
F)
7.47 – 7.59
Ω
P0840 TRANSMISSION FLUID PRESSURE SEN/SW A
TM-137
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F08B]
C
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A
B
TM
N
O
P
P0840 TRANSMISSION FLUID PRESSURE SEN/SW A
Description
INFOID:0000000009948999
• Secondary pressure sensor is installed to control valve.
• Secondary pressure sensor detects pressure that is applied to secondary pulley.
• Secondary pressure sensor converts pressure that is applied to secondary pulley to output voltage and
transmits the signal to TCM.
• Secondary pressure sensor changes voltage according to pressure change. The voltage increases as the
pressure increases.
DTC Logic
INFOID:0000000009949000
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.
Start the engine.
2.
Select “Data Monitor” in “TRANSMISSION”.
3.
Select “ATF TEMP SEN”.
4.
Maintain the following conditions for 5 seconds or more.
5.
Select “Self Diagnostic Results” in “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT”.
Is “P0840” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009949001
1.
CHECK TCM INPUT SIGNAL
1.
Turn ignition switch OFF.
2.
Start the engine.
3.
Check voltage between TCM vehicle side harness connector terminals.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-40, "Intermittent Incident"
.
DTC
Trouble diagnosis name
DTC is detected if...
Possible cause
P0840
Transmission Fluid Pressure
Sensor/Switch A Circuit
• Secondary pressure sensor voltage
that TCM receives is more than 4.7 V
• Secondary pressure sensor voltage
that TCM receives is less than 0.9 V
• Harness or connectors
(Secondary pressure sensor circuit is
open or shorted.)
• Secondary pressure sensor
ATF TEMP SEN
: 2.41 V or less
TCM connector
Condition
Voltage (Approx.)
Connector
Terminal
E19
37
42
• Selector lever: “N” position
• Idle speed
0.8 V
TM-138
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F08B]
P0840 TRANSMISSION FLUID PRESSURE SEN/SW A
NO
>> GO TO 2.
2.
CHECK POWER AND SENSOR GROUND
1.
Turn ignition switch OFF.
2.
Check voltage between TCM vehicle side harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Go to
3.
CHECK HARNESS BETWEEN TCM AND CVT UNIT (SECONDARY PRESSURE SENSOR) (PART 1)
1.
Turn ignition switch OFF.
2.
Disconnect TCM connector and CVT unit harness connector.
3.
Check continuity between TCM vehicle side harness connector terminals and CVT unit vehicle side har-
ness connector terminals.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
CHECK HARNESS BETWEEN TCM AND CVT UNIT (SECONDARY PRESSURE SENSOR) (PART 2)
Check continuity between TCM vehicle side harness connector terminals and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace damaged parts.
5.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace transaxle assembly. Refer to
NO
>> Repair or replace damaged parts.
TCM connector
Condition
Voltage (Approx.)
Connector
Terminal
E19
42
46
Ignition switch: ON
5.0 V
Ignition switch: OFF
0 V
TCM vehicle side harness connector
CVT unit vehicle side harness connector
Continuity
Connector
Terminal
Connector
Terminal
E19
37
F24
23
Existed
42
19
46
20
TCM vehicle side harness connector
Ground
Continuity
Connector
Terminal
E19
37
Not existed
42
46
P0841 TRANSMISSION FLUID PRESSURE SEN/SW A
TM-139
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F08B]
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H
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B
TM
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P0841 TRANSMISSION FLUID PRESSURE SEN/SW A
Description
INFOID:0000000009949002
A malfunction of oil pressure sensor function is detected by mutual monitoring between secondary pressure
sensor and line pressure.
DTC Logic
INFOID:0000000009949003
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.
Start the engine.
2.
Select “Data Monitor” in “TRANSMISSION”.
3.
Select “VEHICLE SPEED”.
4.
Drive the vehicle.
5.
Maintain the following conditions for 5 seconds or more.
6.
Stop the vehicle.
7.
Select “Self Diagnostic Results” in “TRANSMISSION”.
Is “P0841” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009949004
1.
CHECK LINE PRESSURE
Perform line pressure test. Refer to
TM-209, "Inspection and Judgment"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace damaged parts. Refer to
TM-209, "Inspection and Judgment"
.
2.
CHECK SECONDARY PRESSURE SENSOR SYSTEM
Check secondary pressure sensor system. Refer to
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK SECONDARY PRESSURE SOLENOID VALVE
Check line pressure solenoid valve. Refer to
TM-140, "Component Inspection (Line Pressure Solenoid
.
DTC
Trouble diagnosis name
DTC is detected if...
Possible cause
P0841
Transmission Fluid Pressure
Sensor/Switch A Circuit
Range/Performance
Secondary pressure sensor value exceeds
line pressure value
• Harness or connectors
(secondary pressure sensor circuit is
open or shorted.)
• Secondary pressure sensor
VEHICLE SPEED
: More than 30 km/h (19 MPH)
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