DTC P1274: A/F Sensor 1: Wiring Diagram
WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For references to "PG-Power" in wiring diagrams, see POWER DISTRIBUTION
in SYSTEM WIRING DIAGRAMS.
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.