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My engine is running like it's on only 3 of 4 cylinders. I put my code scanner on it and it gave me codes...

P0340 - Camshaft Position Sensor "A" Circuit
P0344 - Camshaft Position Sensor "A" Circuit Intermittent

I believe the "A" circuit is the intake circuit, so I checked the wiring that I could see and it looks fine. Made sure the connector was tight and didn't look burnt or melted, and it wasn't. Did the same with the exhaust side sensor connector, just incase. I then swapped the rear exhaust-side camshaft position sensor with the intake side one as they are identical parts, but the codes still showed showed the same. This leads me to believe that the sensor is not the issue but the wiring. I'm afraid to start tearing apart the harness that that connector is running into in fear of causing more problems.

I'm hoping that someone here might have a wiring diagram for this circuit so I can track down where it goes so I can maybe splice in jumper wiring to bypass that circuitry. Or even suggestions on other things I can try. Or if I'm doomed to be brining this into a dealership service for repair! ACK!
 

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2004 ZX3 SVT EE 160k miles. 2004 ZX3 SVT 189k miles
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Yes. Clean your grounds from the battery to the body as well. On start up allow engine to idle for 5 minutes before driving.
 

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2004 ZX3 SVT EE 160k miles. 2004 ZX3 SVT 189k miles
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3,593 Posts
I've been reading up on this. Check for damage on the starter circuit. The wires can sometimes run through.
 

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No luck with disconnecting and cleaning the grounds.
my focus had about 1 year without power without an apparent reason or failure, 2 weeks ago the codes appeared. My problem was a wire harness, in the section in front of the fan. I detected it by opening the switch, measuring the voltage of the camshaft sensor and moving or tightening the cable in sections. After repairing the cable the codes were turned off and the power returned. Hope this helps someone.
 

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2014 Titanium Hatchback 2.0
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There is a TSB out about this. The engine harness rubs against the intake manifold over time and cuts into the wires as rnstt29 stated. I just did the repair on my car because of the same 0340/0344 codes. See the link for the TSB and photos

 

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