WARNING: This page is about a different car, the 2005 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect injector harness connector.
Check resistance between terminals as shown in the figure.
Resistance: 13.5 - 17.5Ω [at 20°C (68°F)]
Fig 1: Checking Resistance Between Injector Terminals