Nissan Altima L32. Manual - part 1499

TM-340

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

P0826 MANUAL MODE SWITCH

Check continuity between CVT device harness connector M23 termi-

nal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

CHECK GROUND CIRCUIT (PART 2)

1. Turn ignition switch ON.

2. Check voltage between CVT device harness connector M23 ter-

minal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace damaged parts.

6.

CHECK MANUAL MODE SWITCH

Check manual mode switch. Refer to 

TM-340, "Component Inspection (Manual Mode Switch)"

.

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-430, "Exploded View"

.

NO

>> Repair or replace damaged parts.

Component Inspection (Manual Mode Switch)

INFOID:0000000004201921

1.

CHECK MANUAL MODE SWITCH

Check continuity between CVT device terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace damaged parts.

CVT device vehicle side harness 

connector

Ground

Continuity 

Connector

Terminal

M23

4

Existed

AWDIA0128ZZ

CVT device harness connector

Ground

Voltage (Approx.) 

Connector

Terminal

M23

4

0 V

AWDIA0129ZZ

CVT device terminal

Condition

Continuity

5

4

Manual shift gate position (neutral)

Not existed

Other than the above

Existed

1

4

Manual shift gate position (neutral)

Existed

Other than the above

Not existed

3

4

Selector lever: UP (+ side)

Existed

Other than the above

Not existed

2

4

Selector lever: DOWN (

− side)

Existed

Other than the above

Not existed

AWDIA0130ZZ

P0840 TRANSMISSION FLUID PRESSURE SENSOR A (SEC PRESSURE SEN-

SOR)

TM-341

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

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P0840 TRANSMISSION FLUID PRESSURE SENSOR A (SEC PRESSURE
SENSOR)

Description

INFOID:0000000004201922

The transmission fluid pressure sensor A (secondary pressure sensor) detects secondary pressure of CVT

and sends TCM the signal.

DTC Logic

INFOID:0000000004201923

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

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 wait for at least 5 consecutive seconds.

With GST

Follow the procedure “With CONSULT-III”.
Is “P0840 TR PRS SENS/A CIRC” detected?

YES

>> Go to 

TM-341, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000004201924

1.

CHECK INPUT SIGNAL

1. Start engine.

2. Check voltage between TCM harness connector F16 terminal

15 and ground.

3. Turn ignition switch OFF.
Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 2.

2.

CHECK POWER AND SENSOR GROUND

DTC

Item

(CONSULT-III screen term)

Malfunction is detected when...

Possible cause

P0840

TR PRS SENS/A CIRC

Signal voltage of the transmission fluid pres-
sure sensor A (secondary pressure sensor) 
is too high or too low while driving.

• Harness or connectors

(Sensor circuit is open or shorted.)

• Transmission fluid pressure sensor A 

(secondary pressure sensor)

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)

TCM connector

Ground

Condition

Voltage (Ap-

prox.)

Connector

Terminal

F16

15

“N” position idle

1.0 V

JPDIA0984ZZ

TM-342

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

P0840 TRANSMISSION FLUID PRESSURE SENSOR A (SEC PRESSURE SEN-

SOR)

1. Turn ignition switch ON.

2. Check voltage between TCM harness connector F16 terminals

25 and 26.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 5.

3.

CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR A

(SECONDARY PRESSURE SENSOR)] (PART 1)
1. Turn ignition switch OFF.

2. Disconnect TCM harness connector and CVT unit connector .

3. Check continuity between TCM harness connector F16 (A) ter-

minal 15 and CVT unit harness connector F46 (B) terminal 23.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR A

(SECONDARY PRESSURE SENSOR)] (PART 2)
Check continuity between TCM harness connector F16 terminal 15

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 harness connector F16 (A) ter-

minals 25, 26 and CVT unit harness connector F46 (B) terminals

19, 20.

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 harness connector

Voltage (Approx.)

Connector

Terminal

F16

25

26

5.0 V

AWDIA0132ZZ

TCM harness connector

CVT unit harness connector

Continuity

Connector

Terminal

Connector

Terminal

F16

15

F46

23

Existed

AWDIA0133ZZ

TCM harness connector

Ground

Continuity

Connector

Terminal

F16

15

Not existed

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TCM harness connector

CVT unit harness connector

Continuity

Connector

Terminal

Connector

Terminal

F16

25

F46

19

Existed

26

20

AWDIA0135ZZ

P0840 TRANSMISSION FLUID PRESSURE SENSOR A (SEC PRESSURE SEN-

SOR)

TM-343

< COMPONENT DIAGNOSIS >

[CVT: RE0F10A]

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2)

Check continuity between TCM harness connector F16 terminals 25,

26 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace damaged parts.

7.

CHECK TCM

1. Replace same type TCM. Refer to 

TM-430, "Removal and Installation"

.

2. Connect each connector.

3. Perform “DTC CONFIRMATION PROCEDURE”. Refer to 

TM-341, "DTC Logic"

.

Is “P0840 TR PRS SENS/A CIRC” detected?

YES (Only DTC P0840 detected)>>Replace control valve. Refer to 

TM-447, "Exploded View"

.

YES (DTC P0840 and except DTC P0840 are detected)>>Replace transaxle assembly. Refer to 

TM-447,

"Removal and Installation"

.

NO

>> Replace TCM. Refer to 

TM-430, "Removal and Installation"

.

8.

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, "Removal and Installation"

.

NO

>> Repair or replace damaged parts.

TCM harness connector

Ground

Continuity

Connector

Terminal

F16

25

Not existed

26

AWDIA0136ZZ