Automobile electronic circuit analyzer for detecting shorted ECM

Details Automobile electronic circuit analyzer for detecting shorted ECM Automobile electronic circuit analyzer for detecting shorted ECM

1994-05-23

1997-06-17

O'Shea, Sandra L.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

With analysis of displayed waveform

324503, 324525, 324384, F02P 1700

Patent

active

056400934

ABSTRACT:
An automotive electronic circuit analyzer that plugs into an automobile's electronic control module is disclosed. The disclosed analyzer includes positive and negative load sensing cells each having a series resistor coupled to an ECM load via the ECM connector and having an LED transistor for conducting current when the ratio between the load and the series resistor exceeds a predetermined value. A regulated power circuit for sinking current from the positive load sensing cells and for supplying current to the negative load sensing cells includes a timing circuit for controlling the active power pulse width so that the LEDs are illuminated with high frequency, short duration power pulses to indicate a shorted load.

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patent: 5177447 (1993-01-01), Marino et al.
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