2007 hyundai elantrajust had motor rebuilt and refitted motor and keep throwing p0340 code have replaced both cam and crank shalf sensors also check mapping of cam over crank signals still throwing code rebuilder said they removed and clean the cvvt unit what do i try next

behind and to the left of the idle air control valve

for better result download the pdf file
2006 HYUNDAI SONATA SERVICE REPAIR MANUAL DOWNLOAD

The first code is for an evaporative emission canister leak and it might be due to a gas cap. The second one is for a cam sensor circuit problem and this will keep the vehicle from starting. The third error is for the transmission torque converter.

If EGR temp not correct try cleaning it maybe its gunked up and not giving a correct reading.

Then you need a repair shop with experience,
as installing parts based on not diagnosing the codes,
doesn't fix much

P0340 - Cam Timing

SYMPTOMS/CONDITIONS
of a mistimed camshaft system (all must apply):

1. Camshafts have previously been removed from the engine.
2. Engine runs rough.
3. Vehicle sets P0340 (camshaft sensor code).
4. Camshaft sensor has been checked with a known, properly operating camshaft sensor.

CORRECT:
The diagram in the manuals should show the timing marks on both cam gears to be on the blue timing chain links.

they can run with out a cam sensor but they will not run with out crank signal i would check for crank signal it may not throw a dtc because it wont start.

will likely be on the bank with 153 ...the other bank is even numbers 246 .

it might be the cam shaft sensor it might be the crank shaft sensor the best thing to do is replace them bolth. but it does sound like it may be either one because if one goes out the other will still work but when starting the car it will take longer for it to read from either or the one sensor that is still working because they work together to tell the system to deliver the gas. im pretty positive that it is either the cam or crank shaft sensor

Here is what I could find on your P0340 error code:
CausesA code P0340 could mean one or more of the following has happened:

• a wire or connector in the circuit could be grounded/shorted/broken
• the camshaft position sensor may have failed
• the PCM may have failed
• there exists an open circuit
• the crankshaft position sensor may have failed

Possible SolutionsWith a P0340 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

• Visually inspect all the wiring and connectors in the circuit
• Check for continuity in the circuit wiring
• Check the operation (voltage) of the camshaft position sensor
• Replace the camshaft position sensor as required
• Check the crankshaft position circuit as well
• Replace circuit wiring and/or connectors as required
• Diagnose/replace the PCM as required

Sounds like since you have replaced both the camshaft and crank shaft sensors you need to look at the PCM.  Go down the line of possible solutions and don't replace the PCM unless nothing else works obviously.  I hope this helps but it looks like you are looking at getting a new PCM.  Good luck.  Thanks for rating my response and for using FixYa!