How do you check coil on 2003 Nissan?

To check the ignition coil on a 2003 Nissan, start by visually inspecting the coil for any signs of damage or corrosion. Use a multimeter to measure the primary and secondary resistance of the coil; the primary resistance should typically be between 0.5 to 2.0 ohms, while the secondary resistance should be around 6,000 to 15,000 ohms. Additionally, you can perform a spark test by removing the coil and connecting it to the spark plug, then cranking the engine to see if a spark is generated. If the coil fails any of these tests, it may need to be replaced.