Awnryprincess is absolutely correct. there is no camshaft sensor in this vehicle. There is a camshaft signal but it is based on the electronic ignition module. The ignition module delivers 5 volts to the cam sensor circuit when it sees #1 and #3 cylinders fire on their compression stroke. The ignition coil
sends a signal to the ignition module that tells the polarity sequence and voltage amplitude of the 1/2 and 2/3 secondary ignition. The powertrain control module has an internal resistor tied to ground on the signal line in order to read zero volts when there is no signal from the cam circuit.
to make it short: the cam code is set when the powertrain control module does not see the any cam signal change in 35 crankshaft revolutions.
using a scanner you can look at the cmp counter and watch the counter. it should count up to 255 and then drop to 0 and start all over again. the counter will stop if there is a fault.
to get the P0340 code the fault must exist on the cam signal circuit, the brown and white wire, or low resistance on both 1 & 3 or high resistance on both 2 & 4 secondary ignition systems.
A missing cam pulse without a misfire may not affect engine operation...