Abstract: A device for quickly and accurately testing an electronic vehicle engine control module having a simulated signal generator for supplying simulated or "dummy" input signals to the module under test. These simulated signals correspond to signals normally generated by peripheral automotive components such as mass air flow sensors, throttle position sensors, oxygen sensors, and the like, in proper working order. A simulation program controls the simulated signal generator and causes the simulated signal generator to generate predetermined signals appropriate to the design of the module and specific to the simulated operating conditions under which the module is being tested. The simulation program also contains acceptable ranges of output values (that should be produced by a property operating module) corresponding to the simulated operating conditions defined by the simulation program.

Abstract: A mass air flow sensor device for determining the mass of air flowing therethrough is operatively associated with an engine control module of an internal combustion engine which uses data corresponding to the mass of air flowing to the engine for controlling the operation of the engine for increased efficiency and lower exhaust emissions. The mass air flow sensor device includes a housing having an air flow-through housing comprising an electrically resistant air temperature sensing element at the air inlet end of the housing and an electrically resistant air heating element in the housing downstream of the air temperature sensing element. The resistor of the air temperature sensing element and the resistor of the air heating element are components of a common electrical circuit.