I have a 2003 nissan sentra wont start it read code p0340 so i reset it and changed the camshaft sensor and the crankshaft senor and it still wont start and it reads the p0340 code again

Symptoms can include: Hard starting or no start
Rough running / misfiring Loss of engine power Causes
A 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 Solutions With 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

Read more at: http://www.obd-codes.com/p0340
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Camshaft/Crankshaft Position Sensor Replacement - Cadillac Forums

www.cadillacforums.com/.../261074-camshaft-crankshaft-position-senso...

May 29, 2012 - 8 posts - ‎4 authors
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Nissan Murano P0340 2005 Nissan Murano - Camshaft Position Sensor Circuit
Possible causes- Faulty Camshaft Position Sensor-
Camshaft Position Sensor harness is open or shorted- Camshaft Position Sensor circuit poor electrical connection- Faulty starter motor- Starting system circuit-
Dead (Weak) battery
P1701- Fuel trim

I would suggest replacing the camshaft position sensor. When the sensor fails it can cause changes in fuel system that the computer can detect. So I suspect once the camshaft sensor ivreplaced that the P1701 code will be gone.
Cam Position Sensor Replacement Nissan Murano 3 5L

need to replace the camshaft sensor also in tandem w/crankshaft sensor. trouble codes need to be removed from computer. after repair. both the air & fuel filters need replaced. how's your oil change doin ? try this brandi, see if that takes care of it .

These are a well known failure point for this vehicle and engine. They are currently on there third redesign to help solve the frequent failures.

the first thing to do is see if there are any trouble codes in the computer. If you see P0340

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

This means NO CAM SIGNAL AT (PCM)
Possible Causes=
Camshaft Position Sensor (most likley)
MP signal circuit shorted to voltage
Tone wheel/pulse ring damaged
Sensor ground circuit open
5 volt supply circuit open
Irregular LAB scope pattern of CMP signal
Wiring harness intermittent problem
Stay signal from crankshaft position sensor

P0016 crankshaft/camshaft timing misalignment
p0340 camshaft sensor

intermittent crankshaft sensor

PCM detects an error when the camshaft position is out of phase with the crankshaft position

In the kit there are two sensor that look identical. The one for the crankshaft has a white paint mark on it near the bolt hole. Make sure that it is in the right location.

There are two cam shaft sensors and one crank sensor Nissian did sell a kit at one time with all the sensors in it one cam sensor is in the left cylinder head a one is in the right cylinder head

change the crankshaft positon sensor in the rear of the engine above the oilfilter. Also check the wiring to this sensor, they have a problem shorting out. You have to change the camshaft and crankshaft sensors at the same time. Make sure you give your car a major tune up. Did you check yor starter?.........runjoe