An Oil pressure switch is used as a safety device to indicate a loss in oil pressure. With the engine running, pressure is built up in the engine and the oil pressure warning will turn off. If the engine oil pressure drops too low, a warning will flash. The function of an oil pressure switch is to give rapid indication of a loss in oil pressure that could lead to damage of the engine.

This sensor differs to the Oil Pressure Sensor in that this is an on/off sensor, whereas the Oil Pressure Sensor is a variable voltage sensor.

Diagnostics

This enables or disables the Oil Pressure Switch diagnostics. If the conditions are met and the Oil Pressure Switch input turns On, the DTC Severity will be triggered.

Minimum RPM

The RPM that must be met for the Oil Pressure Switch Diagnostic system to operate.

Precondition

Choose between MAP, TPS, or both as a load condition for the system to operate.

Minimum MAP/Minimum TPS

Sets the threshold for the precondition chosen above.

DTC Severity

Sets the level of severity when the Oil Pressure Switch Diagnostic system triggers.

This node allows you to assign the input for the Oil Pressure Switch. The input mode can be changed to choose between an Digital Switched, or a CAN Input (if applicable in the Vehicle CAN system).

Generally, Oil Pressure Switches use an Analog or SPI Input. Any available AVI or SPI can be used.

If using an Analog Input, ensure that the on and off voltages have been set appropriately so that the ECU detects the state of the switch correctly. If using a single wire oil pressure switch, enable the pull-up. To set the on and off voltages correctly, monitor the voltage on the input when the engine is running and not running. 

If using a SPI Input, set the sensor type to 'Hall Effect' (digital), and enable the pull-up. If the sensor pulls to ground when active, set the Edge Select to Falling. If the sensor goes open circuit when active, set it to Rising.