The above typical ignition system wiring diagram applies only to the 1999, 2000, 2001, 2002, 2003, 2004 3.3L Nissan Frontier and Xterra. It includes the following circuits: ignition coil, power transistor (ignition control module), and camshaft position sensor.
NOTE: The power transistor and the camshaft position sensor are part of the same assembly.
The ignition coil, power transistor, and the camshaft position sensor can be easily tested. The following tutorials will help you accomplish these tests: