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Infiniti G35 (V35). Manual - part 32

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

AT-119

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

PFP:31940

Description

NCS000DA

●

The torque converter clutch solenoid valve is activated, with the gear in D

, D

, M2, M3, M4 and M5 by

the TCM in response to signals sent from the vehicle speed sensor and accelerator pedal position sensor
(throttle position sensor). Torque converter clutch piston operation will then be controlled.

●

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

●

When the accelerator pedal is depressed (less than 1.0/8) in lock-up condition, the engine speed should
not change abruptly. If there is a big jump in engine speed, there is no lock-up.

CONSULT-II Reference Value

NCS000DB

On Board Diagnosis Logic

NCS000DC

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P0740 TCC SOLENOID/CIRC” with CONSULT-II or 3rd judgment flicker without
CONSULT-II is detected under the following conditions.

–

When TCM detects an improper voltage drop when it tries to operate the solenoid valve.

–

When TCM detects as irregular by comparing target value with monitor value.

Possible Cause

NCS000DD

●

Torque converter clutch solenoid valve.

●

Harness or connectors.
(Solenoid circuit is open or shorted.)

DTC Confirmation Procedure

NCS000DE

CAUTION:

Always drive vehicle at a safe speed.

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-II

Turn ignition switch ON.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II and check monitor “VHCL/S SE-A/T”,
“ACCELE POSI” and “SLCT LVR POSI”.

Touch “START”.

Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL/S SE-A/T: 80 km/h (50 MPH) or more
ACCELE POSI: 0.5/8 - 1.0/8
SLCT LVR POSI: “D” position
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.

If DTC is detected, go to

AT-120, "Diagnostic Procedure"

WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition

Display value (Approx.)

TCC SOLENOID

Slip lock-up is active

0.2 - 0.4 A

Lock-up is active

0.4 - 0.6 A

BCIA0031E

AT-120

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

Diagnostic Procedure

NCS000DF

CHECK INPUT SIGNAL

With CONSULT-II

Turn ignition switch ON.

Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.

Start engine.

Read out the value of “TCC SOLENOID” while driving.

OK or NG

>> GO TO 4.

>> GO TO 2.

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to

AT-172, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

OK or NG

>> GO TO 3.

>> Repair or replace damaged parts.

DETECT MALFUNCTIONING ITEM

Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.

OK or NG

>> Replace control valve with TCM. Refer to

AT-225, "Control Valve with TCM and A/T Fluid Temper-

ature Sensor 2"

>> Repair or replace damaged parts.

CHECK DTC

Perform

AT-119, "DTC Confirmation Procedure"

OK or NG

>> INSPECTION END

>> GO TO 2.

Item name

Condition

Display value (Approx.)

TCC SOLENOID

Slip lock-up is active

0.2 - 0.4 A

Lock-up is active

0.4 - 0.6 A

SCIA4793E

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)

AT-121

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)

PFP:31940

Description

NCS000DG

This malfunction is detected when the A/T does not shift into 5th gear position or the torque converter clutch
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.

CONSULT-II Reference Value

NCS000DH

On Board Diagnosis Logic

NCS000DI

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P0744 A/T TCC S/V FNCTN” with CONSULT-II or 3rd judgment flicker without
CONSULT-II is detected under the following conditions.

–

When A/T cannot perform lock-up even if electrical circuit is good.

–

When TCM detects as irregular by comparing difference value with slip rotation.

Possible Cause

NCS000DJ

●

Harness or connectors.
(Solenoid circuit is open or shorted.)

●

Torque converter clutch solenoid valve.

●

Hydraulic control circuit.

DTC Confirmation Procedure

NCS000DK

CAUTION:

Always drive vehicle at a safe speed.

WITH CONSULT-II

Start engine and Select “TCC SOL FUNCTN CHECK” of “DTC
WORK SUPPORT” mode for “A/T” with CONSULT-II and touch
“START”.

Accelerate vehicle to more than 80 km/h (50 MPH) and maintain
the following condition continuously until “TESTING” has turned
to “COMPLETE”. (It will take approximately 30 seconds after
“TESTING” shows.)
ACCELE POSI: More than 1.0/8 (at all times during step 4)
TCC SOLENOID: 0.4 - 0.6 A
SLCT LVR POSI: “D” position
[Reference speed: Constant speed of more than 80 km/h (50
MPH)]

–

Make sure “GEAR” shows “5”.

–

For shift schedule, refer to

AT-59, "Vehicle Speed at Which Lock-up Occurs/Releases"

–

If “TESTING” does not appear on CONSULT-II for a long time, select “SELF-DIAG RESULTS”. In
case a DTC other than P0744 is shown, refer to applicable “TROUBLE DIAGNOSIS FOR DTC”.

Make sure that “OK” is displayed. (If “NG” is displayed, refer to

AT-122, "Diagnostic Procedure"

Refer to shift schedule,

AT-59, "Vehicle Speed at Which Lock-up Occurs/Releases"

WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition

Display value (Approx.)

TCC SOLENOID

Slip lock-up is active

0.2 - 0.4 A