Nissan Altima 2007-2012 Service Manual: P1740 lock-up select solenoid valve

Description

• Lock-up select solenoid valve controls lock-up clutch pressure or forward clutch pressure (reverse brake pressure).

• When controlling lock-up clutch, the valve is turned OFF. When controlling forward clutch, it is turned ON.

DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION: Always drive vehicle at a safe speed.

NOTE: If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch OFF.

Then wait at least 10 seconds before performing the next test.

1.CHECK DTC DETECTION

1. Turn ignition switch ON.

2. Select “DATA MONITOR”.

3. Start engine and maintain the following conditions for at least 5 consecutive seconds.

RANGE : “D” or “N” position

(At each time, wait for 5 seconds.)

Follow the procedure “With CONSULT-III”.

Is “P1740 LU-SLCT SOL/CIRC” detected? YES >> Go to TM-358, "Diagnosis Procedure".

NO >> Check intermittent incident. Refer to GI-42, "Intermittent Incident".

Diagnosis Procedure

1.CHECK LOCK-UP SELECT SOLENOID VALVE CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect TCM harness connector.

3. Check resistance between TCM harness connector F16 terminal 37 and ground.

Is the inspection result normal? YES >> GO TO 5.

NO >> GO TO 2.

2.CHECK HARNESS BETWEEN TCM AND CVT UNIT (LOCK-UP SELECT SOLENOID VALVE) (PART 1)

1. Disconnect CVT unit harness connector.

2. Check continuity between TCM harness connector F16 (A) terminal 37 and CVT unit harness connector F46 (B) terminal 13.

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair or replace damaged parts.

3.CHECK HARNESS BETWEEN TCM AND CVT UNIT (LOCK-UP SELECT SOLENOID VALVE) (PART 2)

Check continuity between TCM harness connector F16 terminal 37 and ground.

Is the inspection result normal? YES >> GO TO 4.

NO >> Repair or replace damaged parts.

4.CHECK LOCK-UP SELECT SOLENOID VALVE

Check lock-up select solenoid valve. Refer to TM-359, "Component Inspection (Lock-up Select Solenoid Valve)".

Is the inspection result normal? YES >> GO TO 5.

NO >> Replace transaxle assembly. Refer to TM-447, "Exploded View".

5.DETECT MALFUNCTIONING ITEMS

Check TCM connector pin terminals for damage or loose connection with harness connector.

Is the inspection result normal? YES >> Replace TCM. Refer to TM-430, "Exploded View".

NO >> Repair or replace damaged parts.

Component Inspection (Lock-up Select Solenoid Valve)

1.CHECK LOCK-UP SELECT SOLENOID VALVE

Check resistance between CVT unit terminal 13 and ground.

Is the inspection result normal? YES >> INSPECTION END

NO >> Replace transaxle assembly. Refer to TM-447, "Exploded View".

    P1726 electric throttle control system
    Description Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle position sensor etc. The actuator sends a signal to the ECM, and ECM ...

    P1745 line pressure control
    Description The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM. ...

    Other materials:

    Multiport fuel injection system
    System Diagram System Description INPUT/OUTPUT SIGNAL CHART *1: This sensor is not used to control the engine system under normal conditions. *2: This signal is sent to the ECM through CAN communication line. *3: ECM determines the start signal status by the signals of engine speed and ...

    Satellite radio tuner
     Diagnosis Procedure 1.CHECK FUSES Check that the following fuses are not blown. Are the fuses OK? YES >> GO TO 2 NO >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. 2.POWER SUPPLY CIRCUIT CHECK 1. Turn ignition switch OFF. 2. ...

    Seat belt buckle switch signal circuit
    Description Transmits a seat belt buckle switch signal to the combination meter. Component Function Check 1. CHECK COMBINATION METER INPUT SIGNAL Select “DATA MONITOR” for “METER/M&A” and check the “BUCKLE SW” monitor value. >> Inspection End. Diagnosis Procedure 1. ...