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Computer issues? Codes 0300 and 0340

I am currently having issues with codes 0300 and 0340. Multiple Misfires. We changed the computer last week and in less than 24 hours it is throwing the same codes. the car is randomly hard starting, meaning 2nd key turn it turns over. stalling before computer change, (hasn't stalled since new computer) when the code throws the check engine light on the car bucks when accelerated. it is very random. it can go a day with no codes no stalling or bucking. check engine light goes off and on. my mechanic is stumped.I am hoping to get the car to last me 12 more months any help would be appreciated.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Town & Counrty stalls while driving

Master hall effect sensor on the fly wheel is starting to go bad. It timies the rpms of the engine and times the firing of the spark plugs. The magnet or steel slug the sensor senses as the fly wheel rotates.past the hall effect electronic trigger is begining to fail intermittantly. There are some times two metal slugs to be sensed and the time between the two is used to time the engine. Used to be a coil in the distributor when the steel in the coil gets rusty it swells when it swells it will eventually break the fine wires in the coil and become intermettant just before complety failing. Your problem sounds similar. What ever senses the speed of the engine has to sense something rotating some where to time the engine. That sensor system is failing.

Posted on Apr 24, 2009

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greg_margo
  • 1959 Answers

SOURCE: 2004 Chrsyler Pacifica Won't Start

2 possible problem come to mind:

  • Bad ignition switch; faulty switch will occasionally make contact but not every time
  • Bad starter; less likely but possible; a bad starter will function when it's cold but when it heats up, takes much more power to make it work
I hope this helps with your problem and wish you the best of luck. Take care!
Greg

Posted on May 12, 2009

  • 1 Answer

SOURCE: Check engine light comes on, car sputters, loses power

you need to change you crank shaft positioning censor

Posted on Sep 06, 2009

  • 113 Answers

SOURCE: A few days ago the

After replacing the new O2 sensor, the codes need to be cleared to turn of the check engine light. it sounds to me that they only installed the sensor and because in that moment the check engine light was off they didn't erase the code. Yes I think your car is safe to make those trips, but you should take the car to the workshop so they can erase the code whenever you can.

Posted on Jun 24, 2011

ZJLimited
  • 17970 Answers

SOURCE: 2005 300C Hemi 5.7 Litre

Your first two codes are refer mainly at Craknshaft Position Sensor and sounds like the crank sensor might be shot... but I'm guessing you would also see the truck misfiring or giving other symptoms if the crank sensor was bad. You could try clearing the codes and see if it returns if there are no symptoms.

P0016 = Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
The crankshaft position sensor (CKP) and Camshaft position sensor (CMP) work in harmony to control the spark/fuel delivery and timing. They both consist of a reluctor, or tone, ring which passes over a magnetic sensor, which generates a voltage, indicating position.

The crankshaft sensor is part of the primary ignition system and functions as the "trigger". It detects the position of the crankshaft relays that information on to the PCM or the ignition module (depending on the vehicle) to control spark timing. The Camshaft position sensor detects the position of the camshafts and relays the information to the PCM. The PCM uses the CMP signal to identify the beginning of the injector sequence. What ties these two shafts and their sensors together is the timing belt or chain. The cam and crank should be precisely timed together. If the PCM detects that the Crank and Cam signals are out of time by a specific number of degrees, this P0016 code will set.

Some symptoms of a P0016 will or may include:
Malfunction Indicator Lamp (MIL) illumination
The engine may run but with reduced performance
The engine may crank but not start
The engine may exhibit a rattle near the harmonic balancer indicating the tone ring is damaged
The engine may start and run, but poorly

Causes may include:
Timing chain stretched, or timing belt skipped a tooth due to wear
Misalignment of timing belt/chain
Tone ring on crankshaft slipped/broken
Tone ring on camshaft slipped/broken
Bad crank sensor
Bad cam sensor
Damaged wiring to crank/cam sensor
Timing belt/chain tensioner damaged

This could be the possible solutions:
First, visually inspect the cam and crank sensors and their harnesses for damage. If you notice broken/frayed wires, repair and recheck.
If you have access to a scope, check the cam and crank patterns. If a pattern is missing, suspect a bad sensor or a slipping tone ring. Remove the cam gear and the crankshaft harmonic balancer and inspect the tone rings for proper alignment and make sure they're not loose or damaged or that they haven't sheared the key that aligns them. If they are properly installed, replace the sensor.
If the signal appears normal, then check the timing chain/belt for proper alignment. If it's misaligned, check for a damaged tensioner that may have allowed the chain/belt to slip a tooth or several teeth. Also check that the belt/chain isn't stretched. Repair and recheck.

Other crank sensor codes include P0017, P0018, P0019, P0335, P0336, P0337, P0338, P0339, P0385, P0386, P0387, P0388, and P0389.



P0315 = CKP (Crankshaft Position) System Variation Not Learned.
The crankshaft position (CKP) system variation learn feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the CKP sensor. The calculated error allows the engine control module (ECM) to accurately compensate for reference period variations. This enhances the ability of the ECM to detect misfire events over a wider range of engine speed and load.

The CKP system variation compensating values are stored in ECM memory after a learn procedure has been performed and the ignition switch is turned to the OFF position for at least 30 seconds . If the actual CKP variation is not within the CKP system variation compensating values stored in the ECM, DTC P0300 may set.

If the CKP system variation values are not stored in the ECM memory or a proper ECM power down does not occur after completing the CKP Learn Procedure, DTC P0315 sets.

CONDITIONS FOR RUNNING THE DTC: The diagnostic runs continuously.

CONDITIONS FOR SETTING THE DTC: The ECM detects that the CKP system variation values are not stored in memory.

ACTION TAKEN WHEN THE DTC SETS
The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.

CIRCUIT/SYSTEM TESTING
IMPORTANT: The CKP System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is learned.

Perform the CKP System Variation Learn Procedure. The scan tool should display Learned this Ignition.

If the CKP System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions:
* Any worn crankshaft main bearings.
* A damaged or misaligned reluctor wheel.
* Excessive crankshaft runout.
* A damaged crankshaft
* Interference in the signal circuit of the CKP sensor.
* The ignition switch is in the ON position until there is insufficient system voltage.
* An ECM power disconnect with the ignition ON that may have erased the CKP system variation values and set DTC P0315.
* Any debris between the CKP sensor and the reluctor wheel
* If the control module is unable to complete the learn procedure, replace the control module.

REPAIR INSTRUCTIONS
IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
See: Verification Tests and Procedures Control Module References for ECM replacement, setup, and programming


continue...

Posted on Jul 14, 2011

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