Lock-up Select Solenoid Valve Circuit
Table of contents
P1740 INFINITI Possible Causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty Lock-up Select Solenoid Valve
- Lock-up Select Solenoid Valve harness is open or shorted
- Lock-up Select Solenoid Valve circuit poor electrical connection
How do I fix code P1740 INFINITI?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1740 INFINITI code
The cost of diagnosing the P1740 INFINITI code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1740 INFINITI Description
The lock-up select solenoid valve is installed to control valve. The lock-up select solenoid valve controls the select switch valve that switches the oil pressure applied to the lock-up clutch, forward clutch or reverse clutch. The lock-up select solenoid valve utilizes an ON-OFF solenoid valve. The only operations of the valve spool installed inside the coil are pressing or not pressing the ball which seals the hydraulic supply section into the seat. This A/T uses N/L (normal low) type. When the voltage is not applied to the coil, the force of the pilot pressure presses the ball against the seat, stopping the pilot pressure at that point. When the voltage is applied to the coil, the valve is pulled in the direction of the coil, disengaging the hydraulic
seal which the ball creates. This supplies pilot pressure to the operating locations.