Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
I was wondering if a ECU driver that grounds a circuit can have an intermittent problem. I'm working on a car that when the ECU grounds the circuit I'm looking at, it will intermittently lose the ground. The ground is dropping out just for about a second then comes back. I checked all computer grounds under load, and they all where good. Any thoughts would be appreciated.
What year is the vehicle you are working on? What type of output are you dealing with? Have you checked the current being drawn on the circuit with an oscilloscope? For modern ECUs some OEMs have a design requirement that for certain output devices in the presence of a fault the module only temporarily disable the output, but continuously 'retry'. For example, when the circuit is drawing excessive current the module's internal circuit protection will kick in, but per design requirements will wait a short duration before re-energizing.
You could try to use a power resistor in place of the output device and see if the driver exhibits the same behavior. To eliminate other variables try to use a resistor value that would give a current around the value you'd expect on that circuit for a good representative test.
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