Infiniti M45 (Y34). Manual — part 62

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

AT-133

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7.

CHECK TCM

1.

Check TCM input/output signal. Refer to

AT-86, "TCM Input/Output Signal Reference Values"

.

2.

If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace damaged parts.

Component Inspection

ACS0047Y

TORQUE CONVERTER CLUTCH SOLENOID VALVE
Resistance Check

1.

Turn ignition switch OFF.

2.

Remove oil pan. Refer to

AT-312, "Control Valve Assembly"

.

3.

Disconnect control valve assembly harness connector.

4.

Check resistance between terminal and ground.

5.

If NG, replace control valve assembly. Refer to

AT-312, "Control

Valve Assembly"

.

Operation Check

●

Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal 11 and ground.

Solenoid Valve

Connector No.

Terminal No.

(Wire color)

Resistance

(Approx.)

Torque converter clutch
solenoid valve

F301

11 (BR) - Ground

3 - 9

Ω

SCIA3061E

SCIA3105E

AT-134

DTC P0745 LINE PRESSURE SOLENOID VALVE

DTC P0745 LINE PRESSURE SOLENOID VALVE

PFP:31940

Description

ACS0047Z

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.
The line pressure duty cycle value is not consistent when the closed throttle position signal is ON. To
confirm the line pressure duty cycle at low pressure, the accelerator (throttle) should be open until the
closed throttle position signal is OFF.

CONSULT-II Reference Value

ACS004PF

On Board Diagnosis Logic

ACS00480

●

This is an OBD-II self-diagnostic item.

●

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

ACS00481

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Harness or connectors
(The solenoid circuit is open or shorted.)

●

Line pressure solenoid valve

DTC Confirmation Procedure

ACS00482

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

WITH CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode for
“ENGINE” with CONSULT-II.

2.

Engine start and wait at least 5 second.

3.

If DTC is detected, go to “

AT-136, "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

SAT014K

DTC P0745 LINE PRESSURE SOLENOID VALVE

AT-135

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Wiring Diagram — AT — LPSV

ACS00483

TCWA0115E

AT-136

DTC P0745 LINE PRESSURE SOLENOID VALVE

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

Diagnostic Procedure

ACS00484

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 “LINE PRES SOL” while driving.

Without CONSULT-II

1.

Turn ignition switch ON. (Do not start engine.)

2.

Check voltage between TCM connector and ground.

OK or NG

OK >> GO

TO

6.

NG

>> GO TO 2.

Terminal

No.

Wire

color

Item

Condition

Data (Approx.)

1

B/Y

Line pressure
solenoid valve

IGN ON

After warming up the engine, release your foot from the
accelerator pedal.

2.0V

After warming up the engine, press the accelerator pedal
all the way down.

0.7V

Item name

Condition

Display value (Approx.)

LINE PRES SOL

During driving

0.2 - 0.6 A

SCIA4462E

Item

Con-

nector

No.

Terminal

No.

Condition

Data

(Approx.)

Line

pressure

solenoid

valve

F103

1 (B/Y) -

Ground

IGN
ON

After warming up the

engine, release your

foot from the accelera-

tor pedal.

2.0V

After warming up the

engine, press the

accelerator pedal all

the way down.

0.7V

SCIA3462E