Nissan Frontier D22. Manual - part 84

DTC P0744 IMPROPER LOCK-UP OPERATION

AT-305

[RE4R01A]

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Resistance Check

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Check resistance between terminals  (6, 7) and ground.

Operation Check

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Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminals (3, 2, 4, 6 or 7) and
ground.

Solenoid valve

Terminal No.

Resistance (Approx.)

Line pressure solenoid valve

6

Ground

2.5 - 5 

Ω

Torque converter clutch sole-
noid valve

7

10 - 20 

Ω

SAT158J

AT-306

[RE4R01A]

DTC P0745 LINE PRESSURE SOLENOID VALVE

DTC P0745 LINE PRESSURE SOLENOID VALVE

PFP:31940

Description

ECS007N7

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 switch is ON. To confirm the line pres-
sure duty cycle at low pressure, the accelerator (throttle)
should be open until the closed throttle position switch is OFF.

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE

Remarks: Specification data are reference values.

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

TCM TERMINALS AND REFERENCE VALUE

Remarks: Specification data are reference values.

ON BOARD DIAGNOSIS LOGIC

SAT341H

Monitor item

Condition

Specification (Approx.)

Line pressure solenoid valve 
duty

Small throttle opening (Low line pressure)

↓

Large throttle opening (High line pressure)

24%

↓

95%

Terminal 

No.

Wire color

Item

Condition

Judgement stan-

dard (Approx.)

1

GY/R

Line pressure 

solenoid valve

When releasing accelerator pedal 
after warming up engine.

1.5 - 2.5V

When depressing accelerator pedal 
fully after warming up engine.

0V

2

BR/Y

Line pressure 

solenoid valve 
(with dropping 

resistor)

When releasing accelerator pedal 
after warming up engine.

4 - 14V

When depressing accelerator pedal 
fully after warming up engine.

0V

Diagnostic trouble code

Malfunction is detected when ...

Check item

(Possible cause)

: L/PRESS SOL/CIRC

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

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

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Line pressure solenoid valve

: P0745

DTC P0745 LINE PRESSURE SOLENOID VALVE

AT-307

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DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE

NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch OFF and wait at least 5 seconds before conducting the
next test.
After the repair, perform the following procedure to confirm the mal-
function is eliminated.

With CONSULT-II

1.

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

2.

Depress accelerator pedal completely and wait at least 1 sec-
ond.

 With GST

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Follow the procedure “With CONSULT-II”.

SAT014K

SEF949Y

AT-308

[RE4R01A]

DTC P0745 LINE PRESSURE SOLENOID VALVE

Wiring Diagram — AT — LPSV

ECS007N8

WCWA0101E