Importance

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Abstract

A sensor tester for testing multiple vehicle sensors is provided comprising: a circuit for testing a vehicle piezoelectric knock sensor; a circuit for testing a vehicle speed sensor; and a circuit for testing ignition coils. The circuit for testing piezoelectric knock sensors comprises: an integrated circuit electrically connectable to a power source, the integrated circuit having a multiple step voltage divider, a connector for connecting the integrated circuit to the knock sensor; and a plurality of light emitting diodes electrically connected to the voltage divider of the integrated circuit. The circuit for testing vehicle speed sensors comprises: a voltage divider for limiting the voltage of a power source to a reference voltage; a voltage comparator having a first input, a second input and an output, the first input electrically connected to the voltage divider, the second input electrically connected to the speed sensor; and a voltage transition detector for detecting a voltage transition from the output of the voltage comparator. The circuit for testing ignition coils that have a primary coil and a secondary coil comprises: capacitance means electrically connectable in a loop with a power source and the primary coil; a first voltage indicator electrically connected in series with a side of the secondary winding and electrically connectable to the power source; a second voltage indicator for detecting a voltage across the capacitance means; a current interrupter electrically connected in parallel with the capacitance means; a first connector for connecting the power source in series with the primary coil; and a second connector for connecting the power source in series with the secondary coil.

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First Claim