Ditto, in the distributor.
You can check the coil with a meter.
- pickup coil sends signal to ecu
- ecu sends signal to ignitor
- the ignitor maintains a current to one loop in the coil and then drops it upon signal from the ecu.
- the drop current on one side of the coil, causes the field to collapse, the collapsing magnetic field induces a high voltage to the other loop that leads to the distributor.
If any of the pigtails on any of these parts fails, then problems. Try there first. Then check the ignitor. The ignitor is a tricky item to check requiring an ability to generate 2 voltages to simulate the operating environment.