Nissan Quest E52. Instruction — part 1217
TM-98
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
P0746 PRESSURE CONTROL SOLENOID A
P0746 PRESSURE CONTROL SOLENOID A
Description
INFOID:0000000009650156
• When line pressure solenoid valve is under electrically normal condition, if unusual gear change ratio at
LOW side is detected due to low line pressure, it is judged as malfunction.
• This DTC is not caused by electrical malfunction (circuit is open or shorted), but caused by mechanical mal-
function (control valve clogging, solenoid valve sticking, etc.).
DTC Logic
INFOID:0000000009650157
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.
Warm up the engine. [Set the CVT fluid to 20
°
C (68
°
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.
Drive the vehicle.
4.
Maintain the following conditions for 1 second or more.
5.
Stop the vehicle.
6.
Check DTC.
With GST
Follow the procedure “With CONSULT”.
Is “P0746” detected?
YES
>> Go to
NO
>> INSPECTION END
DTC
Trouble diagnosis name
DTC detection condition
Possible cause
P0746
Pressure Control Solenoid
“A” Performance/Stuck Off
When below diagnosis conditions are met, either of detec-
tion conditions A, B, or C is met
• Diagnosis Conditions
- Selector lever: “D” position
- Vehicle speed: 11 km/h (7 MPH) or more
- Accelerator pedal position: 1.1/8 or more
- Engine speed: More than 600 rpm
- Primary speed: More than 500 rpm
- CVT fluid temperature: 20
°
C – 180
°
C (68
°
F – 356
°
F)
• Detected Condition A
- The gear ratio of primary speed/secondary speed ex-
ceeds 2.7 and keeps the status for 0.2 seconds or more
• Detected Condition B
- The gear ratio of primary speed/secondary speed ex-
ceeds 3.5 and keeps the status for 0.1 seconds or more
• Line pressure control sys-
tem
• Line pressure solenoid valve
• Secondary speed sensor
• Primary speed sensor
Selector lever
: “D” position
Vehicle speed
: 40 km/h (25 MPH) or more
Accelerator pedal position
: 1.1/8 or more
P0746 PRESSURE CONTROL SOLENOID A
TM-99
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
Diagnosis Procedure
INFOID:0000000009650158
1.
CHECK LINE PRESSURE
Perform line pressure test. Refer to
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace damaged parts. Refer to
.
2.
CHECK LINE PRESSURE SOLENOID VALVE
1.
Turn ignition switch OFF.
2.
Disconnect the CVT unit connector.
3.
Check line pressure solenoid valve. Refer to
TM-99, "Component Inspection (Line Pressure Solenoid
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace the transaxle assembly due to malfunction in the line pressure solenoid valve. Refer to
TM-174, "Removal and Installation"
3.
CHECK PRIMARY SPEED SENSOR SYSTEM
Check primary speed sensor system. Refer to
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
CHECK SECONDARY SPEED SENSOR SYSTEM
Check secondary speed sensor system. Refer to
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace damaged parts.
5.
PERFORM INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace the transaxle assembly. Refer to
TM-174, "Removal and Installation"
.
NO
>> Repair or replace damaged parts.
Component Inspection (Line Pressure Solenoid Valve)
INFOID:0000000009650159
1.
CHECK LINE 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 line pressure solenoid valve. Refer to
TM-174, "Removal and Installation"
CVT unit
—
Condition
Resistance (Approx.)
Terminal
2
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-100
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
P0776 PRESSURE CONTROL SOLENOID B
P0776 PRESSURE CONTROL SOLENOID B
Description
INFOID:0000000009650160
• When secondary pressure solenoid valve is under electrically normal condition, the DTC is detected if sec-
ondary pressure is low.
• This DTC is not caused by electrical malfunction (circuit is open or shorted), but caused by mechanical mal-
function (control valve clogging, solenoid valve sticking, etc.).
DTC Logic
INFOID:0000000009650161
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.
Warm up the engine. [Set the CVT fluid to 10
°
C (50
°
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.
Drive the vehicle.
4.
Maintain the following conditions for 30 seconds or more.
5.
Stop the vehicle.
6.
Check DTC.
With GST
Follow the procedure “With CONSULT”.
Is “P0776” detected?
YES
>> Go to
NO
>> INSPECTION END
DTC
Trouble diagnosis name
DTC detection condition
Possible cause
P0776
Pressure Control Solenoid
“B” Performance/Stuck Off
When below diagnosis conditions are met,
the difference between command value and
actual value of secondary pressure exceeds
1.2 MPa and keeps for 30 seconds or more
• Diagnosis Conditions
- Selector lever: “D” position
- Vehicle speed: 11 km/h (7 MPH) or more
- Accelerator pedal position: 1.1/8 or more
- Engine speed: 450 rpm or more
- TCM power supply: More than 10 V
- CVT fluid temperature: 20
°
C – 180
°
C
(68
°
F – 356
°
F)
• Secondary pressure sensor
• Secondary pressure solenoid valve
• Secondary pressure solenoid valve oil
passage
• Line pressure solenoid valve oil passage
Selector lever
: “D” position
Vehicle speed
: 11 km/h (7 MPH) or more
Accelerator pedal position
: 1.1/8 or more
P0776 PRESSURE CONTROL SOLENOID B
TM-101
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
Diagnosis Procedure
INFOID:0000000009650162
1.
CHECK LINE PRESSURE
Perform line pressure test. Refer to
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace damaged parts. Refer to
.
2.
CHECK SECONDARY PRESSURE SOLENOID VALVE
1.
Turn ignition switch OFF.
2.
Disconnect the CVT unit connector.
3.
Check the secondary pressure solenoid valve. Refer to
TM-101, "Component Inspection (Secondary
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace the transaxle assembly due to malfunction in the secondary pressure solenoid valve.
TM-174, "Removal and Installation"
.
3.
CHECK SECONDARY PRESSURE SENSOR SYSTEM
Check the secondary pressure sensor system. Refer to
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. Refer to
TM-174, "Removal and Installation"
.
NO
>> Repair or replace damaged parts.
Component Inspection (Secondary Pressure Solenoid Valve)
INFOID:0000000009650163
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"
.
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
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