Nissan Altima L32. Manual - part 1500

TM-344

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

P0841 PRESSURE SENSOR FUNCTION

P0841 PRESSURE SENSOR FUNCTION

Description

INFOID:0000000004201925

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

tion speed as input signal, 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:0000000004201926

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.

NOTE:

If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch OFF.

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

1.

CHECK DTC DETECTION

With CONSULT-III

1. Turn ignition switch ON.

2. Select “DATA MONITOR”.

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

Is “P0841 PRESS SEN/FNCTN” detected?

YES

>> Go to 

TM-344, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000004201927

1.

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

TM-423, "Inspection and Judgment"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace damaged parts. Refer to 

TM-423, "Inspection and Judgment"

.

2.

CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYS-

TEM
Check transmission fluid pressure sensor A (secondary pressure sensor) system. Refer to 

TM-341, "Descrip-

tion"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)

1. Turn ignition switch OFF.

2. Disconnect CVT unit connector.

DTC

Item

(CONSULT-III screen term)

Malfunction is detected when...

Possible cause

P0841

PRESS SEN/FNCTN

Secondary pressure became higher than 
line pressure.

• Harness or connectors

(Sensor circuit is open or shorted.)

• Transmission fluid pressure sensor A 

(secondary pressure sensor)

VEHICLE SPEED

: 40 km/h (25 MPH) or more

RANGE

: “D” position

P0841 PRESSURE SENSOR FUNCTION

TM-345

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

3. Check pressure control solenoid valve A (line pressure solenoid valve). Refer to 

TM-345, "Component

Inspection [Pressure Control Solenoid Valve A (Line Pressure Solenoid Valve)]"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace transaxle assembly. Refer to 

TM-447, "Exploded View"

.

4.

CHECK PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)

Check pressure control solenoid valve B (secondary pressure solenoid valve). Refer to 

TM-345, "Component

Inspection [Pressure Control Solenoid Valve B (Secondary Pressure Solenoid Valve)]"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace transaxle assembly. Refer to 

TM-447, "Exploded View"

.

5.

CHECK STEP MOTOR SYSTEM

Check step motor system. Refer to 

TM-361, "Description"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace damaged parts.

6.

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-430, "Exploded View"

.

NO

>> Repair or replace damaged parts.

Component Inspection [Pressure Control Solenoid Valve A (Line Pressure Solenoid 
Valve)]

INFOID:0000000004201928

1.

CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)

Check resistance between CVT unit terminal 2 and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace transaxle assembly. Refer to 

TM-447,

"Exploded View"

.

Component Inspection [Pressure Control Solenoid Valve B (Secondary Pressure So-
lenoid Valve)]

INFOID:0000000004201929

1.

CHECK PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)

Check resistance between CVT unit terminal 3 and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace transaxle assembly. Refer to 

TM-447,

"Exploded View"

.

CVT unit terminal

Ground

Resistance (Approx.)

2

3.0 – 9.0 

Ω

AWDIA0122ZZ

CVT unit terminal

Ground

Resistance (Approx.)

3

3.0 – 9.0 

Ω

AWDIA0123ZZ

TM-346

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

P0868 SECONDARY PRESSURE DOWN

P0868 SECONDARY PRESSURE DOWN

Description

INFOID:0000000004201933

The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pressure

to suit the driving condition in response to a signal sent from the TCM.

DTC Logic

INFOID:0000000004201934

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.

NOTE:

If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch OFF.

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

1.

CHECK DTC DETECTION

With CONSULT-III

1. Turn ignition switch ON.

2. Select “DATA MONITOR”.

3. Make sure that output voltage of CVT fluid temperature sensor is within the range below.

4. Start engine and maintain the following conditions for at least 10 consecutive seconds.

Is “P0868 SEC/PRESS DOWN” detected?

YES

>> Go to 

TM-346, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000004201935

1.

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

TM-423, "Inspection and Judgment"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace damaged parts. Refer to 

TM-423, "Inspection and Judgment"

.

2.

CHECK PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)

1. Turn ignition switch OFF.

2. Disconnect CVT unit connector.

DTC

Item

(CONSULT-III screen term)

Malfunction is detected when...

Possible cause

P0868

SEC/PRESS DOWN

Secondary fluid pressure is too low com-
pared with the commanded value while driv-
ing.

• Harness or connectors

(Solenoid circuit is open or shorted.)

• Pressure control solenoid valve B (sec-

ondary pressure solenoid valve) system

• Transmission fluid pressure sensor A 

(secondary pressure sensor)

• Line pressure control system

ATF TEMP SEN

: 1.0 – 2.0 V

If 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)

VEHICLE SPEED (accelerate slow-
ly)

: 0 

→ 50 km/h (31 MPH)

ACC PEDAL OPEN

: 0.5/8 – 1.0/8

RANGE

: “D” position

P0868 SECONDARY PRESSURE DOWN

TM-347

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

3. Check pressure control solenoid valve B (secondary pressure solenoid valve). Refer to 

TM-347, "Compo-

nent Inspection [Pressure Control Solenoid Valve B (Secondary Pressure Solenoid Valve)]"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace transaxle assembly. Refer to 

TM-447, "Exploded View"

.

3.

CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)

Check pressure control solenoid valve A (line pressure solenoid valve). Refer to 

TM-347, "Component Inspec-

tion [Pressure Control Solenoid Valve A (Line Pressure Solenoid Valve)]"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace transaxle assembly. Refer to 

TM-447, "Exploded View"

.

4.

CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYS-

TEM

Check transmission fluid pressure sensor A (secondary pressure sensor) system. Refer to 

TM-341, "DTC

Logic"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

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-430, "Exploded View"

.

NO

>> Repair or replace damaged parts.

Component Inspection [Pressure Control Solenoid Valve A (Line Pressure Solenoid 
Valve)]

INFOID:0000000004201936

1.

CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)

Check resistance between CVT unit terminal 2 and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace transaxle assembly. Refer to 

TM-447,

"Exploded View"

.

Component Inspection [Pressure Control Solenoid Valve B (Secondary Pressure So-
lenoid Valve)]

INFOID:0000000004201937

1.

CHECK PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)

CVT unit terminal

Ground

Resistance (Approx.)

2

3.0 – 9.0 

Ω

AWDIA0122ZZ