Abstract: A magnetic jumper for bypassing electrical circuits. The jumper includes a magnet at each end of a wire. Each magnet can be attached to a terminal of a low voltage electrical circuit in order to bypass that circuit for testing and troubleshooting purposes. The magnetic jumper works with almost any terminal that has steel screws.

Abstract: A magnetic jumper for bypassing electrical circuits. The jumper includes a magnet at each end of a wire. Each magnet can be attached to a terminal of a low voltage electrical circuit in order to bypass that circuit for testing and troubleshooting purposes. The magnetic jumper works with almost any terminal that has steel screws.

Abstract: The rationality of a measured temperature of transmission fluid is assessed by comparing it to an engine coolant temperature. The rationality assessment is enabled when the ambient air temperature is reliably determined and deemed normal, a sufficient soak condition is confirmed, and the measured temperature, the engine temperature and the ambient air temperature are all within prescribed ranges. The rationality assessment monitors the ambient temperature relative to the initial engine temperature during the assessment period, and the assessment is disabled if the ambient air temperature deviates from the initial engine temperature by more than a calibrated value.

Abstract: An improved method of testing for evaporative emission system leaks monitors vacuum decay in a closed system so that the effects of fuel tank expansion during the test interval are minimized. In a first embodiment pass/fail criteria are established in terms of the time required for the system pressure to decay by a calibrated amount for a predetermined leak size. A leak at least as large as the predetermined leak is detected if the measured time is shorter than a calibrated time. The effects of fuel tank expansion are minimized because the changes in fuel tank volume occur primarily due to the pressure differential across the tank, as opposed to the leak size, and the changes that occur during the test are essentially the same for any leak size under consideration.