Infiniti M35/M45 Y50. Manual - part 51

 

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Infiniti M35/M45 Y50. Manual - part 51

 

 

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

AT-127

D

E

F

G

H

I

J

K

L

M

A

B

AT

Diagnostic Procedure

NCS001LW

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Turn ignition switch ON.

2.

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

3.

Start engine.

4.

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

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2. 

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

AT-180, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

DETECT MALFUNCTIONING ITEM

Check the following.

The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.

OK or NG

OK

>> Replace the control valve with TCM. Refer to 

AT-236, "Control Valve With TCM and A/T Fluid

Temperature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-126, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

Item name

Condition

Display value (Approx.)

TCC SOLENOID

Lock-up is active

0.4 - 0.6 A

SCIA4793E

AT-128

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

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

PFP:31940

Description

NCS001LX

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

NCS001LY

On Board Diagnosis Logic

NCS001LZ

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0744 A/T TCC S/V FNCTN” with CONSULT-II or 3rd judgement 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

NCS001M0

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

Torque converter clutch solenoid valve

Hydraulic control circuit

DTC Confirmation Procedure

NCS001M1

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

1.

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

2.

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 - 0.6A
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-371, "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 1st trip DTC other than P0744 is shown, refer to applicable “TROUBLE DIAGNOSIS FOR
DTC”.

3.

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

AT-129, "Diagnostic Procedure"

 .

Refer to shift schedule

AT-371, "Vehicle Speed at Which Lock-Up Occurs/Releases"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition

Display value (Approx.)

TCC SOLENOID

Lock-up is active

0.4 - 0.6 A

BCIA0030E

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

AT-129

D

E

F

G

H

I

J

K

L

M

A

B

AT

Diagnostic Procedure

NCS001M2

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Turn ignition switch ON.

2.

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

3.

Start engine.

4.

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

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2. 

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

AT-180, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

DETECT MALFUNCTIONING ITEM

Check the following.

The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.

OK or NG

OK

>> Replace the control valve with TCM. Refer to 

AT-236, "Control Valve With TCM and A/T Fluid

Temperature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-128, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

Item name

Condition

Display value (Approx.)

TCC SOLENOID

Lock-up is active

0.4 - 0.6 A

SCIA4793E

AT-130

DTC P0745 LINE PRESSURE SOLENOID VALVE

DTC P0745 LINE PRESSURE SOLENOID VALVE

PFP:31940

Description

NCS001M3

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

CONSULT-II Reference Value

NCS001M4

On Board Diagnosis Logic

NCS001M5

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0745 L/PRESS SOL/CIRC” with CONSULT-II or 4th judgement 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

NCS001M6

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

Line pressure solenoid valve

DTC Confirmation Procedure

NCS001M7

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

1.

Turn ignition switch ON.

2.

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

3.

Touch “START”.

4.

Engine start and wait for at least 5 seconds.

5.

If DTC is detected, go to 

AT-131, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition

Display value (Approx.)

LINE PRES SOL

During driving

0.2 - 0.6 A

BCIA0030E

 

 

 

 

 

 

 

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