Nissan Frontier D22. Manual — part 81

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

AT-293

[RE4R01A]

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DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

PFP:31940

Description

ECS007MZ

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

4

, by the TCM in response to signals sent from the vehicle

speed and throttle position sensors. Lock-up piston operation will
then be controlled.
Lock-up operation, however, is prohibited when A/T fluid tempera-
ture is too low.
When the accelerator pedal is depressed (less than 2/8) 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 IN DATA MONITOR MODE

Remarks: Specification data are reference values.

TCM TERMINALS AND REFERENCE VALUE

Remarks: Specification data are reference values.

ON BOARD DIAGNOSIS LOGIC

SAT342HA

Monitor item

Condition

Specification (Approx.)

Torque converter clutch sole-
noid valve duty

Lock-up OFF

↓

Lock-up ON

4%

↓

94%

Terminal

No.

Wire color

Item

Condition

Judgement stan-

dard (Approx.)

3

G/OR

Torque converter

clutch solenoid

valve

When A/T performs lock-up.

8 - 15V

When A/T does not perform lock-up.

0V

Diagnostic trouble code

Malfunction is detected when ...

Check item

(Possible cause)

: TCC SOLENOID/CIRC

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

●

Harness or connectors (The solenoid cir-
cuit is open or shorted.)

●

T/C clutch solenoid valve

: P0740

AT-294

[RE4R01A]

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

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.

2.

Select “DATA MONITOR” mode for “ENGINE” with CONSULT-II
and wait at least 1 second.

With GST

●

Follow the procedure “With CONSULT-II”.

SAT014K

SEF949Y

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

AT-295

[RE4R01A]

D

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Wiring Diagram — AT — TCV

ECS007N0

WCWA0099E

AT-296

[RE4R01A]

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

Diagnostic Procedure

ECS007N1

1.

CHECK GROUND CIRCUIT

1.

Turn ignition switch to OFF position.

2.

Disconnect terminal cord assembly connector in engine compartment.

3.

Check resistance between terminal cord assembly connector E72 terminal 5 and ground. Refer to wiring
diagram.

Is resistance approx. 10 - 20

Ω?

Yes

>> GO TO 2.

No

>> 1. Remove oil pan. Refer to

AT-402, "REMOVAL"

.

2. Check the following items:

–

Torque converter clutch solenoid valve
Refer to

AT-297, "TORQUE CONVERTER CLUTCH SOLENOID VALVE"

.

–

Harness of terminal cord assembly for short or open

2.

CHECK RESISTANCE

1.

Turn ignition switch to OFF position.

2.

Disconnect TCM harness connector.

3.

Check resistance between terminal cord assembly connector E72 terminal 5 and TCM harness connector
M77 terminal 3. Refer to wiring diagrams.

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

Is resistance approx. 0

Ω?

Yes

>> GO TO 3.

No

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

3.

CHECK DTC

Perform Diagnostic Trouble Code (DTC) confirmation procedure. Refer to

AT-294, "DIAGNOSTIC TROUBLE

CODE (DTC) CONFIRMATION PROCEDURE"

.

OK or NG

OK

>> INSPECTION END.

NG

>> 1. Perform TCM input/output signal inspection.

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