What do you do when you get an Ignition Spark Circuit code on a 1990 Nissan 300zx?

When you get an Ignition Spark Circuit code on a 1990 Nissan 300ZX, first check the ignition system components, including the ignition coil, spark plugs, and wiring for any visible damage or corrosion. Next, use a multimeter to test the resistance of the ignition coil and verify that it falls within the manufacturer's specifications. If these components are functioning correctly, inspect the wiring harness and connections for shorts or breaks. If necessary, consult the service manual for further diagnostic procedures specific to the ignition system.