Nissan Frontier D22. Manual - part 356

DTC P1775 TCC SOLENOID VALVE

EC-527

[KA24DE]

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3. 

CHECK OUTPUT SIGNAL CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect ECM harness connector.

3.

Check voltage between ECM terminal 115 and TCC solenoid valve terminal 3.
Refer to Wiring Diagram.

4.

Also check harness for short to ground or short to power.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E43, M65

●

Harness connectors M81, F36

●

Harness for open and short between torque converter clutch solenoid valve and ECM

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

5. 

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

1.

Check resistance between torque converter clutch solenoid
valve terminals 1 and 3.
Resistance: Approximately 25

Ω [at 25°C (77°F)]

2.

Remove torque converter clutch solenoid valve. Refer to 

AT-58,

"REMOVAL"

 .

3.

Supply the solenoid valve terminals 1 and 3 with battery voltage
and check the solenoid valve operation.

Torque converter clutch solenoid valve should be operated.

OK or NG 

OK

>> GO TO 6.

NG

>> Replace torque converter clutch solenoid valve.

6. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Removal and Installation

UBS00DCS

TORQUE CONVERTER CLUTCH SOLENOID VALVE

Refer to 

AT-58, "REMOVAL"

 .

Continuity should exist.

SEF233V

SEF507V

EC-528

[KA24DE]

DTC P1776 TCC SOLENOID VALVE

DTC P1776 TCC SOLENOID VALVE

PFP:31705

System Description

UBS00DCT

ECM controls torque converter clutch solenoid valve with the signals below.

*1: This signal is used only for diagnosis.

The ECM controls torque converter clutch solenoid valve to cancel the lock-up condition of A/T. When the
solenoid valve is turned on,  lock-up is cancelled . When the solenoid valve is turned off, A/T lock-up is oper-
ational.
Conditions for lock-up cancel:
Torque converter clutch solenoid valve is turned “ON” when;

●

Throttle valve is fully closed (during idling or deceleration)

●

Engine coolant temperature is below 40

°C (104°F)

●

Engine is stopped 

Conditions for lock-up operation:

●

Under 55 to 63 km/h (34 to 39 MPH) (2/8 throttle on flat road), lock-up does not operate even when the
torque converter clutch solenoid valve is “OFF”.

●

Over 58 to 66 km/h (36 to 41 MPH) (2/8 throttle on flat road), lock-up should operate because the torque
converter clutch solenoid valve is “OFF”.

To confirm vehicle lock-up, the torque converter clutch solenoid valve must be in operation (“ON” dur-
ing idle and deceleration, and “OFF” during acceleration) and engine speed should drop. When the
accelerator pedal is depressed (less than 2/8) in lock-up, the engine speed should not change
abruptly. If there is a big jump in engine speed, there will be no lock up.

CONSULT-II Reference Value in Data Monitor Mode

UBS00DCU

On Board Diagnosis Logic

UBS00DCV

DTC Confirmation Procedure

UBS00DCW

CAUTION:

Always drive vehicle at a safe speed.

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
Always perform at a temperature above –10

°C (14°F).

 WITH CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 5 seconds.

3.

Start engine.

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor

Engine speed

Torque converter 
lock-up control

Torque converter clutch solenoid 
valve

Engine coolant temperature sensor

Engine coolant temperature

Throttle position sensor

Throttle position

Vehicle speed sensor *1

Vehicle speed

MONITOR ITEM

CONDITON

SPECIFICATION

TCC SOL/V

●

Engine: After warming up

Idle

ON

2,000 rpm

OFF

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

P1776

Lock-up control system function

A/T torque converter slip has 
occurred in lock-up condition.

●

Torque converter clutch solenoid valve

●

A/T hydraulic control system

●

Torque converter

DTC P1776 TCC SOLENOID VALVE

EC-529

[KA24DE]

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4.

Select  “TCC S/V FNCTN P1776” of “A/T (TCC S/V) in DTC
WORK SUPPORT” mode with CONSULT-II.

5.

Touch “START”.

6.

When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions con-
tinuously until “TESTING changes to “COMPLETED”. (It will
take approximately 20 seconds.)

If “TESTING” is not displayed after 5 minutes, retry from
step 2). 

7.

Make sure that”OK” is displayed after touching “SELF-DIAG RESULTS”.
If “NG” is displayed, refer to 

EC-530, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

PEF859U

PEF235V

Selector lever

D (OD “ON”)

Vehicle speed

76 - 100 km/h (47 - 62 MPH)

ENG SPEED

King cab model

Less than 2,300 rpm

B/FUEL SCHDL

7 - 16 msec

THRTL POS SEN

Less than 1.3V

PEF861U

EC-530

[KA24DE]

DTC P1776 TCC SOLENOID VALVE

Diagnostic Procedure

UBS00DCX

1. 

CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

1.

Check resistance between torque converter clutch solenoid
valve terminals 1 and 3.

2.

Remove torque converter clutch solenoid valve. Refer to 

AT-58,

"Control Valve Assembly and Accumulators"

 .

3.

Supply the solenoid valve terminals 1 and 3 with battery voltage
and check the solenoid valve operation.
Torque converter clutch solenoid valve should be operated.

OK or NG

OK

>> GO TO 2.

NG

>> Replace torque converter clutch solenoid valve.

2. 

CHECK TORQUE CONVERTER CLUTCH CONTROL VALVE

1.

Disassemble torque converter clutch control valve assembly. Refer to 

AT-58, "Control Valve Assembly

and Accumulators"

 .

2.

Check torque converter clutch control valve.

–

Valve, and sleeve slide along valve bore under their own weight.

–

Valve, and sleeve are free from burrs, dents and scratches.

–

Control valve springs are free from damage, deformation and fatigue.

–

Hydraulic line is free from obstacles.

OK or NG

OK

>> GO TO 3.

NG

>> Replace torque converter clutch control valve.

3. 

CHECK VEHICLE SPEED SENSOR SIGANL

Check vehicle speed signal with CONSULT-II or speedometer if it is shows an actual vehicle speed.

OK or NG

OK

>> GO TO 4.

NG

>> Check The following: Vehicle speed sensor, Vehicle speed sensor driven gear. If NG, replace

parts

Resistance: Approximately 

25

Ω [at 25°C (77°F)]

SEF233V

SEF234V

SAT740H