The oil pressure sending unit is in control of the oil pressure light or gauge depending on whether you car is equipped with. When oil pressure is applied, the switch contacts either shut off the oil light or lets the oil pressure gauge active. Basically, the oil pressure sending unit is what transfers the oil pressure information to the car’s computer, which then handles the related lights and gauges. It is vital for all car owners to know about the different types of sending units that is available, what problems they may have, and any repair details so they can make informed decisions regarding their vehicle whenever there is an issue.
KNOWING THE SENDING UNIT TYPES
There are three types of oil pressure sending units. The oldest type is a component in the output side of the oil pump to which a connecting tube is linked. This links up to the gauge on the instrument panel to give a reading.
Another type is a screw-in type which has a transducer attached to an electromechanical switch and is connected with a wire to a light on the instrument panel. The sending unit is programmed to turn the switch on when the oil pressure is below a safe level for use. Since the oil pressure is related to the engine revolutions per minute (RPM), this light will come on at low idle speeds and slowly increase as the RPM increases.
Lastly, there is the third type which is some what similar to the second type apart from the fact that it has an electrical voltage output that is directly proportional to the actual oil pressure.
WHEN THE GAUGE FLUCTUATES
When cold, oil is thicker, and when this happens, it needs more pressure to pump the oil. As the oil heats up with use, the pressure will reduce to a more normal level.
TROUBLESHOOTING THE OIL PRESSURE SENDING UNIT
Just like any other vehicle part, this piece can go bad. To work on the oil pressure sending unit, first unhook the wire going to the unit and ground it with the ignition on. The gauge should rise to the highest point. If it does, everything is still good. You can equally screw the gauge in its place and read the oil pressure.
HOW MUCH DOES IT COST
The cost of the oil pressure sending unit is dependent on the automobile and the model, as well as what is being changed. Oil pressure sending units can cost anywhere from thirty dollars to over one hundred dollars depending on your location. You can look for them at auto parts stores or online parts stores. Where you decide to shop for your oil pressure sending unit is dependent on your budget and the urgency of the change. Never wait too long if the unit needs change, as the delay can compromise your vehicle’s safety.