DTC P0340: Camshaft Position Sensor Circuit: Reference
WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
Connect oscilloscope between terminals "C51-1-13" (REF) or "C51-1-12" (POS) and "C51-3-26" (ground) of ECM connector connected to ECM and check CMP sensor signal.