Nissan Qashqai J11. Manual - part 686

P0740 TORQUE CONVERTER

TM-319

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F10D]

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Diagnosis Procedure

INFOID:0000000010589309

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 inspection result normal?

YES 

>> GO TO 2.

NO

>> Repair or replace malfunctioning parts.

2.

CHECK CIRCUIT BETWEEN CVT UNIT AND GROUND

Check resistance between CVT unit harness connector terminal and ground.

Is the inspection result normal?

YES 

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

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

to 

TM-415, "Removal and Installation"

.

TCM

CVT unit

Continuity

Connector

Terminal

Connector

Terminal

F2

38

F58

5

Existed

CVT unit

—

Condition

Resistance

Connector

Terminal

F207

5

Ground

CVT fluid temperature: 20

°

C (68

°

F)

5.5 – 7.0 

Ω

CVT fluid temperature: 50

°

C (122

°

F)

6.0 – 8.0 

Ω

CVT fluid temperature: 80

°

C (176

°

F)

6.5 – 8.5 

Ω

TM-320

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F10D]

P0743 TORQUE CONVERTER

P0743 TORQUE CONVERTER

DTC Logic

INFOID:0000000010589310

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Be careful of the driving speed.

1.

PREPARATION BEFORE WORK

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

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 20

°

C (68

°

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 20

°

C (68

°

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 “P0743” detected?

YES

>> Go to 

TM-321, "Diagnosis Procedure"

.

NO

>> INSPECTION END

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

Possible causes

P0743

TORQUE CONVERTER
(Torque Converter Clutch Cir-
cuit Electrical)

When all of the following conditions are satis-
fied and this state is maintained for 0.48 sec-
onds:
• TCM power supply voltage: More than 11 V
• TCM judges that solenoid valve circuit is 

shorted to ground.

• Harness or connector

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

• Torque converter clutch solenoid valve

FLUID TEMP

: 20

°

C (68

°

F) or more

Selector lever

: “D” position

Vehicle speed

: 40 km/h (25 MPH) or more

P0743 TORQUE CONVERTER

TM-321

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F10D]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

Diagnosis Procedure

INFOID:0000000010589311

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 inspection result normal?

YES 

>> GO TO 2.

NO

>> Repair or replace malfunctioning parts.

2.

CHECK CIRCUIT BETWEEN CVT UNIT AND GROUND

Check resistance between CVT unit harness connector terminal and ground.

Is the inspection result normal?

YES 

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

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

to 

TM-415, "Removal and Installation"

.

TCM

—

Continuity

Connector

Terminal

F2

38

Ground

Not existed

CVT unit

—

Condition

Resistance

Connector

Terminal

F207

5

Ground

CVT fluid temperature: 20

°

C (68

°

F)

5.5 – 7.0 

Ω

CVT fluid temperature: 50

°

C (122

°

F)

6.0 – 8.0 

Ω

CVT fluid temperature: 80

°

C (176

°

F)

6.5 – 8.5 

Ω

TM-322

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F10D]

P0744 TORQUE CONVERTER

P0744 TORQUE CONVERTER

DTC Logic

INFOID:0000000010589312

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Be careful of the driving speed.

1.

PREPARATION BEFORE WORK

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

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 20

°

C (68

°

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 20

°

C (68

°

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 30 seconds or more.

3.

Stop the vehicle.

4.

Check the first trip DTC.

Is “P0744” detected?

YES

>> Go to 

TM-323, "Diagnosis Procedure"

.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

Possible causes

P0744

TORQUE CONVERTER
(Torque converter clutch cir-
cuit intermittent)

When all of the following conditions are satis-
fied and this state is maintained for 30 sec-
onds:
• TCM power supply voltage: More than 11 V
• P0717 is not detected.
• CAN communication is normal
• Torque converter slip speed: (40+vihicle 

speed/2) rpm

• LU pressure: More than 0.2 MPa

• Torque converter clutch solenoid valve
• Control valve assembly
• Torque converter

FLUID TEMP

: 20

°

C (68

°

F) or more

Selector lever

: “D” position

Accelerator pedal position

: 0.5/8 or more

Vehicle speed

: 40 km/h (25 MPH) or more