Nissan Quest E52. Manual - part 1219

TM-106

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

Description

INFOID:0000000009650169

Detects oil sensor function malfunction based on the mutual relation between primary pressure sensor and
secondary pressure sensor.

DTC Logic

INFOID:0000000009650170

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.

3.

Maintain the following conditions for 5 seconds or more.

4.

Stop the vehicle.

5.

Check DTC.

Is “P0841” detected?

YES

>> Go to 

TM-106, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009650171

1.

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

TM-65, "Work Procedure"

.

Is the inspection result normal?

YES

>> .GO TO 2.

NO

>> Repair or replace damaged parts. Refer to 

TM-65, "Work Procedure"

.

2.

CHECK PRIMARY PRESSURE SENSOR SYSTEM

Check primary pressure sensor system. Refer to 

TM-86, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

DTC

Trouble diagnosis name

DTC detection condition

Possible cause

P0841

Transmission Fluid Pressure 
Sensor/Switch A Circuit 
Range/Performance

Primary pressure sensor value and second-
ary pressure sensor value exceed standard 
range and keep the status for 5 seconds or 
more

• Harness or connectors

(Secondary pressure sensor circuit is 
open or shorted.)

• Harness or connectors

(Primary pressure sensor circuit is open 
or shorted.)

• Secondary pressure sensor
• Primary pressure sensor

Vehicle speed

: 30 km/h (17 MPH) or more

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

TM-107

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

3.

CHECK SECONDARY PRESSURE SENSOR SYSTEM

Check secondary pressure sensor system. Refer to 

TM-88, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK LINE PRESSURE SOLENOID VALVE

1.

Turn ignition switch OFF.

2.

Disconnect the CVT unit connector.

3.

Check the line pressure solenoid valve. Refer to 

TM-99, "Component Inspection (Line Pressure Solenoid

Valve)"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

TM-174, "Removal and Installation"

.

5.

CHECK SECONDARY PRESSURE SOLENOID VALVE

Check the secondary pressure solenoid valve. Refer to 

TM-103, "Component Inspection (Secondary Pressure

Solenoid Valve)"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

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

Refer to 

TM-174, "Removal and Installation"

.

6.

CHECK STEP MOTOR SYSTEM

Check the step motor system. Refer to 

TM-125, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace damaged parts.

7.

CHECK 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"

.

NO

>> Repair or replace damaged parts.

Component Inspection (Line Pressure Solenoid Valve)

INFOID:0000000009650172

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"

.

Component Inspection (Secondary Pressure Solenoid Valve)

INFOID:0000000009650173

1.

CHECK SECONDARY PRESSURE SOLENOID VALVE

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-108

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

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.

Refer to 

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

P0845 TRANSMISSION FLUID PRESSURE SEN/SW B

TM-109

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

P0845 TRANSMISSION FLUID PRESSURE SEN/SW B

DTC Logic

INFOID:0000000009650174

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 5 seconds or more.

4.

Check DTC.

With GST

Follow the procedure “With CONSULT”.

Is “P0845” detected?

YES

>> Go to 

TM-109, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009650175

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 SENSOR POWER AND SENSOR GROUND

1.

Turn ignition switch OFF.

2.

Check the voltage between TCM connector terminals.

DTC

Trouble diagnosis name

DTC detection condition

Possible cause

P0845

Transmission Fluid Pressure 
Sensor/Switch “B” Circuit

When below diagnosis conditions are met, second-
ary pressure sensor value is kept 4.7 V or more or 
0.09 V or less for 5 seconds or more
• Diagnosis Condition
- CVT fluid temperature: More than 

−

20

°

C (

−

4

°

F)

• Harness or connectors

(Primary pressure sensor circuit is 
open or shorted.)

• Primary pressure sensor

TCM

Condition

Voltage (Approx.)

Connector

+

-

Terminal

F23

14

25

“N” position idle

0.7 – 3.5 V