![]() This engine-load device is responsible for long-term fuel trim and for injector pulse rate. Since the inception of OBD-II, Ford vehicles with EEC-V computer control systems have used the mass-air-flow (MAF) sensor as a primary input for fuel-system control. In other words, today’s transmission technicians are rapidly becoming electrical and drivability technicians, because these “other” systems (that is one of the choices on your scan-tool menu) directly affect how a transmission performs. The transmission business is very different today, and technicians find themselves having to deal with a number of vehicle operating systems that they once thought would never concern them. Notice that the preceding paragraph starts with “once upon a time,” which is how a fairy tale begins. Once upon a time in a transmission shop, transmissions were built and installed and the vehicles road tested and delivered – life was good. Author: Pete Luban, ATSG Technical Supervisor.For more information please refer to our gauge reference pressure guide. The gauge referenced pressure is calculated by subtracting the barometric pressure from the absolute referenced pressure, and will appear once the required pressure units are selected directly underneath. For more information please refer to our barometric pressure guide. The barometric pressure should be measured at the same location and time as the absolute referenced pressure was measured. P baro – Barometric PressureĮnter the barometric pressure and select the associated pressure units directly underneath. For more information please refer to our absolute pressure guide. P abs – Absolute PressureĮnter the absolute referenced pressure and select the associated pressure units directly underneath. ![]() ![]() This tool will calculate the gauge pressure by subtracting the barometric pressure from the absolute referenced pressure reading you entered and convert any combination of pressure units for each pressure value. ![]() Calculate absolute pressure using gauge and barometric pressure. ![]()
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