Infiniti FX35, FX50 (S51). Manual - part 1867

P0740 TORQUE CONVERTER

TM-275

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

C

E

F

G

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A

B

TM

N

O

P

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/T assembly. Refer to 

TM-362, "Exploded View"

.

NO

>> Repair or replace damaged parts.

TM-276

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

P0744 TORQUE CONVERTER

P0744 TORQUE CONVERTER

Description

INFOID:0000000005250266

This malfunction is detected when the A/T does not lock-up as instructed by the TCM. This is not only caused
by electrical malfunction (circuits open or shorted) but also by mechanical malfunction such as control valve
sticking, improper solenoid valve operation, etc.

DTC Logic

INFOID:0000000005250267

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

 With CONSULT-III

1.

Start the engine. 

2.

Select “MANU MODE SW”, “GEAR” and “VEHICLE SPEED” in “Data Monitor” in “TRANSMISSION”.

3.

Drive vehicle and maintain the following conditions for 10 seconds or more.
NOTE:
Driving the vehicle uphill (increased engine load) will help maintain the driving conditions required for this
test.

4.

Perform “Self Diagnostic Results” in “TRANSMISSION”.

 With GST

Follow the procedure “With CONSULT-III”.
Is “P0744” detected?

YES

>> Go to 

TM-276, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005250268

1.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/T assembly. Refer to 

TM-362, "Exploded View"

.

NO

>> Repair or replace damaged parts.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0744

Torque Converter Clutch Circuit 
Intermittent

The lock-up is not performed in 
spite of within the lock-up area.

• Harness or connectors
• Torque converter clutch sole-

noid valve

• Torque converter
• Input speed sensor 1, 2
• Hydraulic control circuit

MANU MODE SW

: ON

GEAR

: 2nd

VEHICLE SPEED

: 40 km/h (25 MPH) or more

P0745 PRESSURE CONTROL SOLENOID A

TM-277

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

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P0745 PRESSURE CONTROL SOLENOID A

Description

INFOID:0000000005250269

The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in
response to a signal transmitted from the TCM.

DTC Logic

INFOID:0000000005250270

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

 With CONSULT-III

1.

Start the engine.

2.

Select “BATTERY VOLT” and “SLCT LVR POSI” in “Data Monitor” in “TRANSMISSION”.

3.

Shift the selector lever to “N” position.

4.

Maintain the following conditions for 5 seconds or more.

5.

Perform “Self Diagnostic Results” in “TRANSMISSION”.

 With GST

Follow the procedure “With CONSULT-III”.

Is “P0745” detected?

YES

>> Go to 

TM-277, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005250271

1.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/T assembly. Refer to 

TM-362, "Exploded View"

.

NO

>> Repair or replace damaged parts.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0745

Pressure Control Solenoid A

The line pressure solenoid 
valve monitor value is 0.4 A or 
less when the line pressure so-
lenoid valve command value is 
more than 0.75 A.

• Harness or connectors

(Solenoid valve circuit is 
open or shorted.)

• Line pressure solenoid valve

BATTERY VOLT

: 9 V or more

SLCT LVR POSI

: N/P

TM-278

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B (VK50VE)]

P0750 SHIFT SOLENOID A

P0750 SHIFT SOLENOID A

Description

INFOID:0000000005250272

• Anti-interlock solenoid valve prevents the simultaneous activation of the input clutch and the low brake.
• The anti-interlock solenoid valve is an ON/OFF type solenoid valve.

DTC Logic

INFOID:0000000005250273

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

 With CONSULT-III

1.

Start the engine. 

2.

Select “BATTERY VOLT”, “MANU MODE SW”, “GEAR” and “VHCL/S SE-A/T” in “Data Monitor” in
“TRANSMISSION”.

3.

Drive vehicle and maintain the following conditions for 5 seconds or more.

4.

Perform “Self Diagnostic Results” in “TRANSMISSION”.

 With GST

Follow the procedure “With CONSULT-III”.

Is “P0750” detected?

YES

>> Go to 

TM-278, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005250274

1.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/T assembly. Refer to 

TM-362, "Exploded View"

.

NO

>> Repair or replace damaged parts.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0750

Shift Solenoid A

• The anti-interlock solenoid 

valve monitor value is ON 
when the anti-interlock sole-
noid valve command value is 
OFF.

• The anti-interlock solenoid 

valve monitor value is OFF 
when the anti-interlock sole-
noid valve command value is 
ON.

• Harness or connectors

(Solenoid valve circuit is 
open or shorted.)

• Anti-interlock solenoid valve

BATTERY VOLT

: 9 V or more

MANU MODE SW

: ON

GEAR

: 1st

VHCL/S SE-A/T

: 10 km/h (7 MPH) or more