Nissan Versa Sedan. Manual - part 819

TM-182

< DTC/CIRCUIT DIAGNOSIS >

[4AT: RE4F03C]

P0743 TORQUE CONVERTER

P0743 TORQUE CONVERTER

DTC Logic

INFOID:0000000009267948

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.

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-182, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009267949

1.

CHECK CIRCUIT BETWEEN TCM AND A/T UNIT

1. Turn ignition switch OFF.

2. Disconnect the TCM connector and A/T unit connector.

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

Is the check result normal?

YES 

>> GO TO 2.

DTC

Trouble diagnosis name

DTC detection condition

Possible causes

P0743

Torque Converter Clutch Circuit 
Electrical

The following diagnosis condi-
tions are met, and the TCM 
torque converter clutch sole-
noid valve current monitor read-
ing is 200 mA or less 
continuously for 0.5 seconds or 
more.
• Diagnosis condition
- Solenoid valve output cur-

rent: 750 mA or more

- GND short circuit diagnosis 

occurs in the solenoid valve 
drive circuit.

- TCM power supply voltage: 

10 V < TCM power supply 
voltage < 16 V

• Harness or connector

(Short circuit to ground in the 
torque converter clutch sole-
noid valve circuit)

• Torque converter clutch sole-

noid valve

Selector lever

: D position

Vehicle speed

: 45 km/h (28 MPH) or more

TCM harness connector

Ground

Continuity

Connector

Terminal

F44

38

Ground

Does not exist

P0743 TORQUE CONVERTER

TM-183

< DTC/CIRCUIT DIAGNOSIS >

[4AT: RE4F03C]

C

E

F

G

H

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J

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M

A

B

TM

N

O

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NO

>> Repair or replace the malfunctioning parts.

2.

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check the torque converter clutch solenoid valve. Refer to 

TM-183, "Component Inspection (Torque Converter

Clutch Solenoid Valve)"

.

Is the check result normal?

YES 

>> Check intermittent incident. Refer to 

GI-45, "Intermittent Incident"

.

NO

>> Repair or replace the malfunctioning parts.

Component Inspection (Torque Converter Clutch Solenoid Valve)

INFOID:0000000009267950

1.

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check the resistance between the A/T unit connector terminal and ground.

Is the check result normal?

YES

>> INSPECTION END

NO

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

assembly. Refer to 

TM-250, "Removal and Installation"

.

A/T unit connector

Ground

Condition

Resistance

Terminal

18

Ground

A/T fluid temperature: 20

°C 

(68

°F)

Approx. 6.1 

Ω

A/T fluid temperature: 50

°C 

(122

°F)

Approx. 6.9 

Ω

A/T fluid temperature: 80

°C 

(176

°F)

Approx. 7.7 

Ω

TM-184

< DTC/CIRCUIT DIAGNOSIS >

[4AT: RE4F03C]

P0744 TORQUE CONVERTER

P0744 TORQUE CONVERTER

Description

INFOID:0000000009267951

This DTC is detected when the torque converter clutch solenoid valve is electrically normal but the torque con-

verter clutch does not engage. This is not due to an electrical malfunction (circuit open or shorted), but is

instead due to a mechanical malfunction (sticking of the control valve, malfunction of the solenoid, etc.).

DTC Logic

INFOID:0000000009267952

DTC DETECTION LOGIC

DTC REPRODUCTION 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.

CHECK DTC DETECTION

1. Drive the vehicle.

2. Maintain the following conditions for 35 seconds or more.

3. Stop the vehicle.

4. Check the first trip DTC.
Is “P0744” detected?

YES

>> Go to 

TM-184, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-45, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000009267953

1.

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

TM-130, "Work Procedure"

.

Is the check result normal?

YES 

>> GO TO 2.

NO

>> Repair or replace the malfunction items.

2.

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

1. Turn ignition switch OFF.

2. Disconnect the A/T unit connector.

3. Check the torque converter clutch solenoid valve. Refer to 

TM-185, "Component Inspection (Torque Con-

verter Clutch Solenoid Valve)"

.

DTC

Trouble diagnosis name

DTC detection condition

Possible causes

P0744

Torque Converter Clutch Circuit 
Intermittent

The following diagnosis condi-
tions are met, and the torque 
converter slip speed is at or 
above a set value (40 rpm + Ve-
hicle speed / 2) continuously for 
30 seconds or more.
• Diagnosis condition
- Lock-up pressure difference: 

More than Max. lock-up pres-
sure difference 

× 0.95

• Torque converter clutch sole-

noid valve

• Control valve assembly
• Torque converter

Selector lever

: D position

Vehicle speed

: 45 km/h (28 MPH) or more

P0744 TORQUE CONVERTER

TM-185

< DTC/CIRCUIT DIAGNOSIS >

[4AT: RE4F03C]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

Is the check result normal?

YES 

>> Check intermittent incident. Refer to 

GI-45, "Intermittent Incident"

.

NO

>> Repair or replace the malfunction items.

Component Inspection (Torque Converter Clutch Solenoid Valve)

INFOID:0000000009267954

1.

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check the resistance between the A/T unit connector terminal and ground.

Is the check result normal?

YES

>> INSPECTION END

NO

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

assembly. Refer to 

TM-250, "Removal and Installation"

.

A/T unit connector

Ground

Condition

Resistance

Terminal

18

Ground

A/T fluid temperature: 20

°C 

(68

°F)

Approx. 6.1 

Ω

A/T fluid temperature: 50

°C 

(122

°F)

Approx. 6.9 

Ω

A/T fluid temperature: 80

°C 

(176

°F)

Approx. 7.7 

Ω