DISTRIBUTORLESS Ignition System: Spark
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Infiniti QX4, 2003 Infiniti Q45, 2003 Infiniti M45, 2003 Infiniti I35, and 2003 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
Remove each ignition coil, leaving harness connected. Connect a known good spark plug to ignition coil. Place end of Spark plug against a suitable ground. Crank engine and check for spark. If spark does not exist, check ignition coil, power transistor and circuits.