"Chrysler PT Cruiser":Check Engine Code "P0340"

Engine codes trouble code P0340

While accelerating accelerate normally "engine sputter", hesitating picking up speed.

"Auto Repair" mechanic scanned the vehicle with OBD ii tool and retrieve Engine error codes P0340



There is simple procedure to retrieve error codes with out Obd ii software.
I will mention that procedure here:

Follow the procedure mentioned below:

With the doors closed cycle the key from off to on three times ending with it on and watch the digital odometer display. Don't crank the starter, just off to on. The codes start with a P and have four numbers, there may be more than one stored. Write down and go through the manual for the error codes.

Here we will discuss about OBD code P0340


P0340  "obd codes" sets when the engine controller doesn't see a signal from the camshaft position sensor.

"Where is the camshaft position sensor"  "What is camshaft position sensor"

The cam sensor is on the left end of the cylinder head and is mounted with two 8mm bolts.
Cam sensor is the sensing device which reads off a magnet on the end of the intake cam and reports the cam's position and speed.

Cam sensor shown as CMP





camshaft position sensor code can be set by improper cam timing, wiring, the magnet in rare cases, or a failure of the sensor itself. At least 99% of the time this is just a failed cam sensor, which is common on these engines.

I  recommend taking a look at the "camshaft position sensor" connection and wiring in the immediate area, if all looks ok then replace the sensor. It's not hard to replace yourself if you normally do some minor repairs. You just have to unplug it and remove the two bolts.

Its suggested only using a Mopar replacement sensor. Aftermarket sensors have shown extremely poor quality and you usually end up with at least the same problem if not more problems with the new sensor. They sometimes cause the same code to immediately reset, new codes to appear, or even a no start condition.

The reason it takes alot of cranking to start it is because the cam signal gets missing. The software in the vehicles NGC engine controller actually allows the engine to start if it sees the cam signal is missing, but it starts with an extended crank time.

The hesitation felt is also because of the missing cam signal. When it sees the signal is missing it will impose a 2,500 RPM rev limiter. When you are accelerating and try to exceed 2,500 RPM it will cut fuel and spark back to limit engine RPM.

camshaft position sensor replacement
The camshaft sensor cost about $61 from a dealer or you can pick one up from an online Mopar parts source such as www.moparonlineparts.com for a bit cheaper. That site sells the same Mopar sensor for $45.

To removal and install new cam sensor:




This will help.
Thanks.

Camshaft Position CMP Sensor Operation?

The details are as follows :---

Camshaft Position (CMP) Sensor

OPERATION


The PCM uses the Camshaft Position (CMP) sensor signal to determine the position of the No. 1 cylinder piston during its power stroke. The signal is used by the PCM to calculate fuel injection mode of operation. If the cam signal is lost while the engine is running, the fuel injection system will shift to a calculated fuel injected mode based on the last fuel injection pulse, and the engine will continue to run.

On the 3.1L and 3.4L (VIN E) engine, the Camshaft Position (CMP) sensor is located on the timing chain cover behind the water pump near the camshaft sprocket. As the camshaft sprocket turns, a magnet in it activates the Hall-Effect switch in the CMP sensor. When the Hall-Effect switch is activated, it grounds the signal line to the PCM, pulling the CMP sensor circuit's applied voltage low. This is interpreted as a CAM signal. The cam signal is created as piston #1 is on the intake stroke. If the correct CAM signal is not received by the PCM, a DTC will be set.

On the 3.4L (VIN X) engine, the Camshaft Position (CMP) sensor is mounted to the left bank camshaft carrier, towards #6 cylinder. A 3-wire harness connector plugs into the sensor, connecting it to the Powertrain Control Module (PCM). The PCM applies a signal voltage to the sensor. The left bank exhaust camshaft has a tooth machined into the casting. The camshaft position sensor is separated from the exhaust camshaft by an air gap. As the exhaust camshaft rotates, the machined tooth aligns with the sensor. The signal voltage to the sensor is pulled low. The PCM interprets the change in signal voltage as an indication of camshaft position. The CAM signal is created as piston #1 is on the intake stroke. If the correct CAM signal is not received by the PCM, a DTC will set.

On the 3.5L (VIN H) engine, the Camshaft Position (CMP) sensor is located at the rear of the forward camshaft carrier, near the engine lift ring bracket. The sensor signal, when combined with the Crankshaft Position sensor signal, enables the PCM to determine exactly which cylinder is on a firing stroke. The PCM can then properly synchronize the ignition system, fuel injectors and knock control. The camshaft position sensor has a power, ground and signal circuit. The PCM supplies 12 volts to the sensor. The PCM also supplies the ground path, or sensor return circuit, from the sensor. These power and ground circuits are also connected to the crankshaft position sensor. If a problem is detected in the camshaft position circuit, a DTC will set.

On 3.8L engine, the Camshaft Position (CMP) sensor is mounted on the engine timing chain front cover. The camshaft position sensor sends a cam signal to the PCM which uses it as a sync pulse to trigger the injectors in the proper sequence. The CAM signal is passed through the ignition control module. The PCM uses the CAM signal to indicate the position of the #1 piston during its power stroke, allowing the PCM to calculate true Sequential Fuel Injection. If the PCM detects an incorrect CAM signal, a DTC will set.


This will help.
thanks.