Nissan Sentra. Manual - part 887

T

M

- 1

8

4

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F11A]

P0740 TORQUE CONVERTER

P0740 TORQUE CONVERTER

DTC Logic

INFOID:0000000009759420

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Be careful of the driving speed.

1.

PREPARATION BEFORE OPERATION (PART 1)

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at

least 10 seconds, then perform the next test.

>> GO TO 2.

2.

PREPARATION BEFORE OPERATION (PART 2)

With CONSULT

1. Start the engine.

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

3. Select “FLUID TEMP”.

4. Confirm that the CVT fluid temperature is in the following range. 

With GST

1. Start the engine.

2. 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. 

Is the CVT fluid 10

°C (50°F) or more? 

YES

>> GO TO 3.

NO

>> 1. Warm the transaxle. 

2. GO TO 3.

3.

CHECK DTC DETECTION

1. Drive the vehicle.

2. Maintain the following conditions for 10 seconds or more.

3. Stop the vehicle.

4. Check the first trip DTC.
Is “P0740” detected?

YES

>> Go to 

TM-185, "Diagnosis Procedure"

.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

Possible causes

P0740

TORQUE CONVERTER
(Torque Converter Clutch Cir-
cuit/Open)

The TCM torque converter clutch solenoid 
valve current monitor reading is 200 mA or 
less continuously for 5 seconds or more under 
the following diagnosis conditions:
• Diagnosis conditions
- Solenoid valve output current: 750 mA or 

more

- GND short diagnosis of the solenoid valve 

circuit is not satisfied. 

- TCM power supply voltage: More than 11 V

• Harness or connector

(Torque converter clutch solenoid valve 
circuit is open or shorted to power sup-
ply)

• Torque converter clutch solenoid valve

FLUID TEMP

: 10

°C (50°F) or more

Selector lever

: “D” position

Vehicle speed

: 40 km/h (25 MPH) or more

P0740 TORQUE CONVERTER

TM-185

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F11A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009759421

1.

CHECK CIRCUIT BETWEEN TCM AND CVT UNIT

1. Turn ignition switch OFF.

2. Disconnect TCM connector and CVT unit connector.

3. Check continuity between TCM harness connector terminal and CVT unit harness connector terminal.

Is the check result normal?

YES 

>> GO TO 2.

NO

>> Repair or replace malfunctioning parts.

2.

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check torque converter clutch solenoid valve. Refer to 

TM-185, "Component Inspection"

.

Is the check result normal?

YES 

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Repair or replace malfunctioning parts.

Component Inspection

INFOID:0000000009759422

1.

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check resistance between CVT unit connector terminal and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> There is a malfunction of torque converter clutch solenoid valve. Replace transaxle assembly.

Refer to 

TM-283, "Removal and Installation"

.

TCM

CVT unit

Continuity

Connector

Terminal

Connector

Terminal

F23

38

F46

6

Existed

CVT unit

—

Condition

Resistance

(Approx.)

Terminal

6

Ground

CVT fluid temperature: 20

°C (68°F)

6.1 

Ω

CVT fluid temperature: 50

°C (122°F)

6.9 

Ω

CVT fluid temperature: 80

°C (176°F)

7.7 

Ω

TM-186

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F11A]

P0743 TORQUE CONVERTER

P0743 TORQUE CONVERTER

DTC Logic

INFOID:0000000009759423

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Be careful of the driving speed.

1.

PREPARATION BEFORE OPERATION (PART 1)

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at

least 10 seconds, then perform the next test.

>> GO TO 2.

2.

PREPARATION BEFORE OPERATION (PART 2)

With CONSULT

1. Start the engine.

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

3. Select “FLUID TEMP”.

4. Confirm that the CVT fluid temperature is in the following range. 

With GST

1. Start the engine.

2. 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. 

Is the CVT fluid 10

°C (50°F) or more? 

YES

>> GO TO 3.

NO

>> 1. Warm the transaxle. 

2. GO TO 3.

3.

CHECK DTC DETECTION

1. Drive the vehicle.

2. Maintain the following conditions for 5 seconds or more.

3. Stop the vehicle.

4. Check the first trip DTC.
Is “P0743” detected?

YES

>> Go to 

TM-187, "Diagnosis Procedure"

.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

Possible causes

P0743

TORQUE CONVERTER
(Torque Converter Clutch Cir-
cuit Electrical)

The TCM torque converter clutch solenoid 
valve current monitor reading is 200 mA or 
less continuously for 480 msec or more under 
the following diagnosis conditions:
• Diagnosis conditions
- Solenoid valve output current: 750 mA or 

more

- GND short circuit diagnosis occurs in the 

solenoid valve drive circuit.

- TCM power supply voltage: More than 11 V

• Harness or connector

(Torque converter clutch solenoid valve 
circuit is shorted to ground)

• Torque converter clutch solenoid valve

FLUID TEMP

: 10

°C (50°F) or more

Selector lever

: “D” position

Vehicle speed

: 40 km/h (25 MPH) or more

P0743 TORQUE CONVERTER

TM-187

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F11A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009759424

1.

CHECK CIRCUIT BETWEEN TCM AND CVT UNIT

1. Turn ignition switch OFF.

2. Disconnect TCM connector and CVT unit connector.

3. Check continuity between TCM harness connector terminal and ground.

Is the check result normal?

YES 

>> GO TO 2.

NO

>> Repair or replace malfunctioning parts.

2.

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check torque converter clutch solenoid valve. Refer to 

TM-187, "Component Inspection"

.

Is the check result normal?

YES 

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Repair or replace malfunctioning parts.

Component Inspection

INFOID:0000000009759425

1.

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check resistance between CVT unit connector terminal and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> There is a malfunction of torque converter clutch solenoid valve. Replace transaxle assembly.

Refer to 

TM-283, "Removal and Installation"

.

TCM

—

Continuity

Connector

Terminal

F23

38

Ground

Not existed

CVT unit

—

Condition

Resistance

(Approx.)

Terminal

6

Ground

CVT fluid temperature: 20

°C (68°F)

6.1 

Ω

CVT fluid temperature: 50

°C (122°F)

6.9 

Ω

CVT fluid temperature: 80

°C (176°F)

7.7 

Ω