Nissan Quest E52. Instruction — part 1218
TM-102
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
P0778 PRESSURE CONTROL SOLENOID B
P0778 PRESSURE CONTROL SOLENOID B
DTC Logic
INFOID:0000000009650164
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
CHECK DTC DETECTION
With CONSULT
1.
Start the engine.
2.
Drive the vehicle at least for 10 seconds.
3.
Stop the vehicle.
4.
Check DTC.
With GST
Follow the procedure “With CONSULT”.
Is “P0778” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009650165
1.
CHECK SECONDARY PRESSURE SOLENOID VALVE
1.
Disconnect the CVT unit connector.
2.
Check the secondary pressure solenoid valve. Refer to
TM-103, "Component Inspection (Secondary
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace the transaxle assembly due to malfunction in the secondary pressure solenoid valve.
TM-174, "Removal and Installation"
.
2.
CHECK HARNESS BETWEEN TCM AND CVT UNIT
1.
Disconnect TCM connector.
2.
Check the continuity between TCM harness connector terminal and CVT unit harness connector terminal.
DTC
Trouble diagnosis name
DTC detection condition
Possible cause
P0778
Pressure Control Solenoid
“B” Electrical
Secondary pressure solenoid valve monitor volt-
age value of TCM keeps less than 70% of com-
mand voltage for 1 second or more
• Harness or connectors
(Secondary pressure solenoid valve
circuit is open or shorted.)
• Secondary pressure solenoid valve
When below diagnosis conditions are met, sec-
ondary pressure solenoid valve monitor current
value of TCM keeps less than 400 mA for 5 sec-
onds or more
• Diagnosis Condition
- Secondary pressure solenoid valve command
current value: 750 mA or more
P0778 PRESSURE CONTROL SOLENOID B
TM-103
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
3.
Check the continuity between TCM harness connector terminal and ground.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
NO
>> Repair or replace damaged parts.
Component Inspection (Secondary Pressure Solenoid Valve)
INFOID:0000000009650166
1.
CHECK SECONDARY PRESSURE SOLENOID VALVE
Check the resistance between CVT unit connector terminal and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace the transaxle assembly due to malfunction in the secondary pressure solenoid valve.
TM-174, "Removal and Installation"
.
TCM
CVT unit
Continuity
Connector
Terminal
Connector
Terminal
F23
39
F24
3
Existed
TCM
—
Continuity
Connector
Terminal
F23
39
Ground
Not existed
CVT unit
—
Condition
Resistance (Approx.)
Terminal
3
Ground
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
TM-104
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
P0840 TRANSMISSION FLUID PRESSURE SEN/SW A
P0840 TRANSMISSION FLUID PRESSURE SEN/SW A
DTC Logic
INFOID:0000000009650167
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
CHECK DTC DETECTION
With CONSULT
1.
Start the engine.
2.
Warm up the engine. [Set the CVT fluid to
−
19
°
C (
−
4
°
F) or more.]
NOTE:
When the ambient temperature is 20
°
C (68
°
F), the CVT fluid usually increases to 50 to 80
°
C (122 to
176
°
F) with driving in an urban area for approximately 10 minutes.
3.
Wait for 10 seconds or more.
4.
Check DTC.
With GST
Follow the procedure “With CONSULT”.
Is “P0840” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009650168
1.
CHECK TCM INPUT SIGNAL
1.
Start the engine.
2.
Check the voltage between TCM connector terminals.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
NO
>> GO TO 2.
2.
CHECK POWER AND SENSOR GROUND
DTC
Trouble diagnosis name
DTC detection condition
Possible cause
P0840
Transmission Fluid Pressure
Sensor/Switch “A” Circuit
When below diagnosis conditions are met, secondary
pressure sensor value is kept 4.7 V or more for 5 seconds
or more
• Diagnosis Conditions
- CVT fluid temperature: More than
−
20
°
C (
−
4
°
F)
- Target secondary pressure: 5.7 MPa or less
• Harness or connectors
(Secondary pressure sensor
circuit is open or shorted.)
• Secondary pressure sensor
When below diagnosis conditions are met, secondary
pressure sensor value is kept 0.09 V or less for 5 seconds
or more
• Diagnosis Condition
- CVT fluid temperature: More than
−
20
°
C (
−
4
°
F)
TCM
Condition
Voltage (Approx.)
Connector
+
-
Terminal
F23
15
25
“N” position idle
1.0 V
P0840 TRANSMISSION FLUID PRESSURE SEN/SW A
TM-105
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
1.
Turn ignition switch OFF.
2.
Check the voltage between TCM terminals.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Go to
3.
CHECK HARNESS BETWEEN TCM AND CVT UNIT
1.
Turn ignition switch OFF.
2.
Disconnect the TCM connector.
3.
Disconnect the CVT unit connector.
4.
Check continuity between TCM harness connector terminals and CVT unit harness connector terminals.
5.
Check continuity between TCM harness connector terminals and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
PERFORM INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace the transaxle assembly due to malfunction in the secondary pressure sensor. Refer to
TM-174, "Removal and Installation"
NO
>> Repair or replace damaged parts.
TCM
Condition
Voltage (Approx.)
Connector
+
-
Terminal
F23
25
26
Turn ignition switch ON
5.0 V
Turn ignition switch OFF
0 V
TCM
CVT unit
Continuity
Connector
Terminal
Connector
Terminal
F23
15
F24
23
Existed
25
19
26
20
TCM
—
Continuity
Connector
Terminal
F23
15
Ground
Not existed
25
26
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