Nissan Maxima. Manual - part 1156

TM-88

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

Description

INFOID:0000000010113646

Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolu-

tion speed as input signals, TCM changes the operating pressure of the primary pulley and the secondary pul-

ley and changes the groove width of the pulley to control the gear ratio.

DTC Logic

INFOID:0000000010113647

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.

NOTE:

Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.

Then wait at least 10 seconds before performing the next test.

1.

CHECK DTC DETECTION

With CONSULT

1. Turn ignition switch ON.

2. Select “Data Monitor” in “TRANSMISSION”.

3. Start engine and maintain the following conditions for at least 12 consecutive seconds.

Is “P0841” detected?

YES

>> Go to 

TM-88, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000010113648

1.

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

TM-162, "Inspection and Judgment"

.

Is the inspection result normal?

YES

>> .GO TO 2.

NO

>> Repair or replace damaged parts. Refer to 

TM-162, "Inspection and Judgment"

.

2.

CHECK SECONDARY PRESSURE SENSOR SYSTEM

Check secondary pressure sensor system. Refer to 

TM-85, "Description"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK PRIMARY PRESSURE SENSOR SYSTEM

Check primary pressure sensor system. Refer to 

TM-90, "Description"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0841

Transmission Fluid Pressure 
Sensor/Switch A Circuit 
Range/Performance

Correlation between the values of the trans-
mission fluid pressure sensor A (secondary 
pressure sensor) and the transmission fluid 
pressure sensor B (primary pressure sen-
sor) is out of specification.

• Harness or connectors

(Sensor circuit is open or shorted.)

• Secondary pressure sensor
• Primary pressure sensor

VEHICLE SPEED

: 40 km/h (25 MPH) or more

RANGE

: “D” position

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

TM-89

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

4.

CHECK LINE PRESSURE SOLENOID VALVE

1. Turn ignition switch OFF.

2. Disconnect CVT unit connector.

3. Check line pressure solenoid valve. Refer to 

TM-89, "Component Inspection (Line Pressure Solenoid

Valve)"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

CHECK SECONDARY PRESSURE SOLENOID VALVE

Check secondary pressure solenoid valve. Refer to 

TM-89, "Component Inspection (Secondary Pressure

Solenoid Valve)"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace damaged parts.

6.

CHECK STEP MOTOR SYSTEM

Check step motor system. Refer to 

TM-109, "Description"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace damaged parts.

7.

DETECT MALFUNCTIONING ITEMS

Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

>> Replace TCM. Refer to 

TM-168, "Exploded View"

.

NO

>> Repair or replace damaged parts.

Component Inspection (Line Pressure Solenoid Valve)

INFOID:0000000010113649

1.

CHECK LINE PRESSURE SOLENOID VALVE

Check resistance between CVT unit connector terminal and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace transaxle assembly. Refer to 

TM-188,

"Exploded View"

.

Component Inspection (Secondary Pressure Solenoid Valve)

INFOID:0000000010113650

1.

CHECK SECONDARY PRESSURE SOLENOID VALVE

Check resistance between CVT unit connector terminal and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace transaxle assembly. Refer to 

TM-188,

"Exploded View"

.

CVT unit connector

Ground

Resistance 

(Approx.)

Connector

Terminal

F46

2

3.0 – 9.0 

Ω

SCIA4686E

CVT unit connector

Ground

Resistance 

(Approx.)

Connector

Terminal

F46

3

3.0 – 9.0 

Ω

AWDIA0123ZZ

TM-90

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P0845 TRANSMISSION FLUID PRESSURE SEN/SW B

P0845 TRANSMISSION FLUID PRESSURE SEN/SW B

Description

INFOID:0000000010113651

The primary pressure sensor detects primary pressure of CVT and sends a signal to the TCM.

DTC Logic

INFOID:0000000010113652

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

NOTE:

Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.

Then wait at least 10 seconds before performing the next test.

1.

CHECK DTC DETECTION

With CONSULT

1. Turn ignition switch ON.

2. Select “Data Monitor” in “TRANSMISSION”.

3. Check that output voltage of line temperature sensor is within the range below.

4. Start engine and wait for at least 5 consecutive seconds.

With GST

Follow the procedure “With CONSULT”.
Is “P0845” detected?

YES

>> Go to 

TM-90, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000010113653

Regarding Wiring Diagram information, refer to 

TM-126, "Wiring Diagram"

.

1.

CHECK INPUT SIGNAL

1. Start engine.

2. Check voltage between TCM connector terminal and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 2.

2.

CHECK SENSOR POWER AND SENSOR GROUND

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0845

Transmission Fluid Pressure 
Sensor/Switch B Circuit

Signal voltage of the primary pressure sen-
sor is too high or too low while driving.

• Harness or connectors

(Sensor circuit is open or shorted.)

• Primary pressure sensor

ATF TEMP SEN

: 1.0 – 2.0 V

If it is out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the voltage 
(cool down the fluid)

TCM connector

Ground

Condition

Voltage 

(Approx.)

Connector

Terminal

F15

14

“N” position 
idle

0.5 – 0.8 V

AWDIA0137ZZ

P0845 TRANSMISSION FLUID PRESSURE SEN/SW B

TM-91

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

Check voltage between TCM connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 5.

3.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (PRIMARY PRESSURE SENSOR) (PART 1)

1. Turn ignition switch OFF.

2. Disconnect TCM connector and CVT unit connector.

3. Check continuity between TCM vehicle side harness connector

terminal and CVT unit vehicle side harness 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 (PRIMARY PRESSURE SENSOR) (PART 2)

Check continuity between TCM vehicle side harness connector ter-

minal and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace damaged parts.

5.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART

1)

1. Turn ignition switch OFF.

2. Disconnect TCM connector and CVT unit connector.

3. Check continuity between TCM vehicle side harness connector

terminal and CVT unit vehicle side harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace damaged parts.

6.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART

TCM connector

Voltage

(Approx.)

Connector

Terminal

F15

25

26

4.75 – 5.25 V

AWDIA0132ZZ

TCM vehicle side harness 

connector

CVT unit vehicle side harness 

connector

Continuity

Connector

Terminal

Connector

Terminal

F15 (A)

14

F46 (B)

25

Existed

AWDIA0138ZZ

TCM vehicle side harness connector

Ground

Continuity

Connector

Terminal

F15

14

Not existed

AWDIA0139ZZ

TCM vehicle side harness con-

nector

CVT unit vehicle side harness 

connector

Continuity

Connector

Terminal

Connector

Terminal

F15 (A)

25

F46 (B)

19

Existed

26

20

AWDIA0135ZZ