Two-wire ignition coils use an externally mounted module, or power stage, for controlling the primary current.
To scope this signal, you can tap into the circuit, but make sure you use an attenuator, so the inductive kick does not damage the scope, said Babcox Media’s Joe Keene in the above video sponsored by Standard Motor Products.
“You can also use a current clamp on one of the wires to see the switching of the driver circuit and whether the primary current is reaching saturation,” Keene said. “On two-wire systems, chances are the ignition module is measuring dwell and burn time through the power and ground in the module.”
Watch the video for more insights from Joe on navigating the ignition coil connector. This video is sponsored by Standard Motor Products.
