Infiniti M45 (Y34). Manual - part 61

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

AT-129

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 WITH GST

Follow the procedure “With CONSULT-II”.

AT-130

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

Wiring Diagram — AT — TCCSIG

ACS0047W

TCWA0114E

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

AT-131

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TCM terminal and data are reference value. Measured between each terminal and ground.

Diagnostic Procedure

ACS0047X

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start engine.

2.

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

3.

Read out the value of “TCC SOLENOID” while driving.
Check the value changes according to driving speed.

 Without CONSULT-II

1.

Start engine.

2.

Check voltage between TCM connector and ground.

OK or NG

OK >> GO 

TO 

6.

NG

>> GO TO 2.

2. 

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect A/T unit assembly harness connector at the trans-
mission right side.

3.

Check the resistance between terminal and ground.

OK or NG

OK >> GO 

TO 

5.

NG

>> GO TO 3.

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

20

Y

TCC solenoid 
valve

When   

vehicle 
cruises

When lock-up

More than 2V 

When not lock-up

0V

Item name

Condition 

Display value (Approx.)

TCC SOLENOID

When perform slip lock-
up

0.2 - 0.4A

When perform lock-up

0.4 - 0.6A

SCIA4462E

Item

 Connec-

tor No.

 Terminal 

No.

 Condition

Data 

(Approx.)

TCC sole-
noid valve

 F103

 20 (Y) - 

Ground

When lock-up

More than 

2V 

When not lock-up

0V

SCIA4464E

Solenoid valve

Connector No.

Terminal No. 

Resistance (Approx.) 

Torque converter clutch 
solenoid valve

F27

8 - Ground

3 - 9 

Ω

SCIA1830E

AT-132

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

3. 

CHECK TERMINAL CORD ASSEMBLY

1.

Remove oil pan. Refer to 

AT-312, "Control Valve Assembly"

 .

2.

Disconnect A/T unit assembly harness connector and control valve assembly harness connector.

3.

Check continuity between A/T unit assembly harness connector
and control valve assembly harness connector.

4.

If OK, check harness for short to ground and short to power.

5.

Reinstall any part removed.

OK or NG

OK

>> GO TO 4.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

4. 

CHECK VALVE RESISTANCE

Check valve resistance

●

Refer to 

AT-133, "Component Inspection"

 .

OK or NG

OK >> GO 

TO 

6.

NG

>> Replace the control valve assembly. Refer to 

AT-312, "Control Valve Assembly"

 .

5. 

CHECK POWER SOURCE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect TCM connector.

3.

Check continuity between A/T unit assembly harness connector
and TCM connector.

4.

If OK, check harness for short to ground and short to power.

5.

Reinstall any part removed.

OK or NG

OK

>> GO TO 6.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

6. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-123, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 7.

Item

Connector No.

Terminal No. (Wire color)

Continuity

A/T unit assembly har-
ness connector

F27

8 (R/B)

Yes

Control valve assem-
bly harness connector

F301

11 (R/B)

SCIA3060E

Item

Connector No.

Terminal No. (Wire color)

Continuity

TCM

F103

20 (Y)

Yes

A/T unit assembly 
harness connector

F27

8 (Y)

SCIA1831E