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Nissan Quest E52. Manual - 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.

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.

CHECK DTC DETECTION

With CONSULT

Start the engine.

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.

Drive the vehicle.

Maintain the following conditions for 1 second or more.

Stop the vehicle.

Check DTC.

With GST

Follow the procedure “With CONSULT”.
Is “P0746” detected?

YES

>> Go to

TM-99, "Diagnosis Procedure"

>> 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

• 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]

Diagnosis Procedure

INFOID:0000000009650158

CHECK LINE PRESSURE

Perform line pressure test. Refer to

TM-65, "Work Procedure"

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair or replace damaged parts. Refer to

TM-65, "Work Procedure"

CHECK LINE PRESSURE SOLENOID VALVE

Turn ignition switch OFF.

Disconnect the CVT unit connector.

Check line pressure solenoid valve. Refer to

TM-99, "Component Inspection (Line Pressure Solenoid

Valve)"

Is the inspection result normal?

YES

>> GO TO 3.

>> Replace the transaxle assembly due to malfunction in the line pressure solenoid valve. Refer to

TM-174, "Removal and Installation"

CHECK PRIMARY SPEED SENSOR SYSTEM

Check primary speed sensor system. Refer to

TM-86, "DTC Logic"

Is the inspection result normal?

YES

>> GO TO 4.

>> Repair or replace damaged parts.

CHECK SECONDARY SPEED SENSOR SYSTEM

Check secondary speed sensor system. Refer to

TM-88, "DTC Logic"

Is the inspection result normal?

YES

>> GO TO 5.

>> Repair or replace damaged parts.

PERFORM INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

Is the inspection result normal?

YES

>> Replace the transaxle assembly. Refer to

TM-174, "Removal and Installation"

>> Repair or replace damaged parts.

Component Inspection (Line Pressure Solenoid Valve)

INFOID:0000000009650159

CHECK LINE PRESSURE SOLENOID VALVE

Check the resistance between CVT unit connector terminal and ground.

Is the inspection result normal?

YES

>> INSPECTION END

>> 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

Ground

CVT fluid temperature: 20

C (68

5.60 – 6.60

Ω

CVT fluid temperature: 50

C (122

6.76 – 6.87

Ω

CVT fluid temperature: 80

C (176

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.

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.

CHECK DTC DETECTION

With CONSULT

Start the engine.

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.

Drive the vehicle.

Maintain the following conditions for 30 seconds or more.

Stop the vehicle.

Check DTC.

With GST

Follow the procedure “With CONSULT”.

Is “P0776” detected?

YES

>> Go to

TM-101, "Diagnosis Procedure"

>> 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

(68

F – 356

• 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