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:
Fuel gauge
System Diagram
System Description
The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by the unified meter control unit and a variable
resistor signal supplied by the fuel
level sensor unit.
Component Parts Location
1. Combination ...
Power supply routing circuit
Wiring Diagram — Battery Power Supply —
Wiring Diagram — Accessory Power Supply —
Wiring Diagram — Ignition Power Supply —
Fuse
• If fuse is blown, be sure to eliminate cause of malfunction before
installing new fuse.
• Use fuse of spe ...
Checking engine oil level
QR25DE engine
1. Park the vehicle on a level surface and apply
the parking brake.
2. Start the engine and let it idle until it reaches
operating temperature.
3. Turn off the engine. Wait more than
10 minutes for the oil to drain back into
the oil pan.
4. Remove the dipstick and wipe it cle ...