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P0340 already replaced CMP

P0340 and DTC 12 Replaced CMP same result. tugs at around 2000 rpm steady on accelerator pedal- total loss of power. -Suspected Crankshaft seal leak due to oil seaping to CMP sensor. -Parts source has no PCM replacement= free ratchet!! -Fuel rail has no test port What could cause this and how do I test the fuel pressure. Thanks for the help!

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  • Contributor
  • 11 Answers

When you start the car does it turn on right away or does it turn over slowly, gets faster and then finally fires up? That's a sign for low fuel pressure. If it turns over normally and always fine I would suspect that your fuel system is okay. Also low fuel pressure would be caused by a faulty fuel pump. If the car is leaking oil, you should get that fixed asap, it should be on top of your list. You can fix the sensor after you fixed your engine. Because leaking engines can kill themselves pretty fast, which would be more trouble to fix than faulty sensors.

Posted on May 04, 2013

Testimonial: "Depends on the day, Sometimes fires up after battery is removed or code deleted. Not sure if dodge is leaking oil due to installing-Removing Sensor but found trace oil in CMP area... Having trouble finding fuel rail Test port to determine pressure issue- as per Haynes. Seeing as this vehicle is 3 or 4th hand, could the previous owner have dialed in timming to Premium setting thus causing Timming issue? Grounds have been messed with forsure, I twisted them back together and taped LOL... waiting for paycheck..*HeavySigh*"

  • 1 more comment 
  • Ricardo Valenzuela May 17, 2013

    Recap: replaced CMP and recently CKP Sensors. Check enginge light still on, around 2000 Rpm shutter or pulse occurrs. Spark plugs are good, have yet to determine wether fuel rail and Pump are functional...

  • Ricardo Valenzuela May 19, 2013

    Ckp, Cmp, knock sensor replaced. Acquiring fuel rail with test port and injectors.
    Ckp sensor was burned and same with injector 3.

  • Ricardo Valenzuela Jul 22, 2013

    Intermittent issue after sensors replaced. Possiblesolution is to have pcm replaced or reflashed.Working for the meantime

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Lets start from scratch. Have you check for spark? On all cylinders?

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SOURCE: 2000 elantra no power to fuel pump.

could be a bad earth or [ground]
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A misfire at idle that smooths out at cruise is ALMOST ALWAYS caused by a vacuum leak. Take a hard look at your fuel trims at idle. If the Bank 2 Long Term Fuel Trim is more than + a couple points higher than the Bank 1 trim, your problem is most likely a vacuum leak. If the Fuel Trims even-out while holding the engine at 2000 RPM for about 20 seconds, then a vacuum leak is DEFINITELY your problem. I would suspect a leaking lower intake gasket leak because an upper plenum leak will normally affect all cylinders.

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Yes the oil can cause the car to lose spark, the oil leak could be caused by the valve cover gaskets around the spark openings, but 9 times out of 10 it is the spark plug tube "O" rings. The top of the valve train comes off of the head, the "O" rings are between the two halves, that will fix the oil leak.

Posted on Apr 22, 2009

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SOURCE: quits while driving replaced many suspected parts

try this, the next time it quits leave the key in on position and get a broom stick and go to the passenger side of the car. About straight in at the back of the door ,reach under with the broom stick and tap the plastic gas tank a few times, have someone try to start it or go start it yourself. Mine did this even after the garage checked it out and cleaned the tank. Come to find out dirt settles around the fuel pump and clogs it. They just blame the pump but in my case the pump was fine. I was told Alero used a very small fine mesh in the sock that goes in the fuel pump and they clog up. But most of the dirt was around the plastic guard around the fuel pump. See if this works and let us know. Good luck

Posted on Apr 07, 2009

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06 Pontiac G6 2.4 I replaced the motor, started right up and ran great. Shut it off, now it won't start. I have no spark, and codes, po366 and po341 showed up. What's common to these 2 sensors?


DTC P0340: Intake CMP Sensor Circuit
DTC P0341: Intake Camshaft Position (CMP) Sensor Performance
DTC P0365: Exhaust Camshaft Position (CMP) Sensor Circuit
DTC P0366: Exhaust Camshaft Position (CMP) Sensor Performance

The five volt reference circuit .

The 4X camshaft position (CMP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit, and an output signal circuit. The CMP sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past the CMP sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent an image of the camshaft reluctor wheel. The frequency of the CMP sensor output depends on the velocity of the camshaft. The ECM decodes the narrow and wide tooth pattern to identify camshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses CMP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home operation.
Do you know what the five volt reference circuit is .

How to check the 5v reference circuit for short to ground Cadillac

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Why won't the car start with the new Crank shaft position sensor installed? 2005 Buick Lacrosse cxl 3.8l engine.


After replacing crank sensor Perform the crankshaft position system variation learn procedure. Refer to Crankshaft Position System Variation Learn !
No you don't need to replace the balancer !
Install a scan tool.
Monitor the powertrain control module (PCM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information for the applicable DTC.
Select the crankshaft position variation learn procedure with a scan tool.
The scan tool instructs you to perform the following:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release the throttle when fuel cut-off occurs.
4.3. Observe the fuel cut-off specifications for the applicable engine.
4.4. The engine should not accelerate beyond the calibrated RPM value.
4.5. Release the throttle immediately if the value is exceeded.
4.6. Block the drive wheels.
4.7. Set the parking brake.
4.8. DO NOT apply the brake pedal.
4.9. Cycle the ignition from OFF to ON.
4.10. Apply and hold the brake pedal.
4.11. Start and idle the engine.
4.12. Turn the A/C OFF.
4.13. The vehicle must remain in Park or Neutral.
4.14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
• Crankshaft position (CKP) sensors activity--If there is a CKP sensor condition, refer to the applicable DTC.
• Camshaft position (CMP) signal activity--If there is a CMP signal condition, refer to the applicable DTC.
• Engine coolant temperature (ECT)--If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
Enable the crankshaft position system variation learn procedure with the scan tool and perform the following:
Important: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.
5.1. Accelerate to WOT.
5.2. Release when fuel cut-off occurs.
5.3. Test in progress.
The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information for the applicable DTC.
Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set.
• Engine replacement

Feb 07, 2017 | 2005 Buick LaCrosse

1 Answer

What are the probable causes of DTC P0340 other than a defective CPS?


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
Copyright OBD-Codes.com

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2005 buick lacrosse crank shaft sensor how to replace


What engine does yours have ? 3.6 or 3.8 L An when finished a
Crankshaft Position System Variation Learn
  1. Install a scan tool.
  2. Monitor the powertrain control module (PCM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information for the applicable DTC.
  3. Select the crankshaft position variation learn procedure with a scan tool.
  4. The scan tool instructs you to perform the following:
  5. 4.1.
    Accelerate to wide open throttle (WOT).


    4.2.
    Release the throttle when fuel cut-off occurs.


    4.3.
    Observe the fuel cut-off specifications for the applicable engine.


    4.4.
    The engine should not accelerate beyond the calibrated RPM value.


    4.5.
    Release the throttle immediately if the value is exceeded.


    4.6.
    Block the drive wheels.


    4.7.
    Set the parking brake.


    4.8.
    DO NOT apply the brake pedal.


    4.9.
    Cycle the ignition from OFF to ON.


    4.10.
    Apply and hold the brake pedal.


    4.11.
    Start and idle the engine.


    4.12.
    Turn the A/C OFF.


    4.13.
    The vehicle must remain in Park or Neutral.


    4.14.
    The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:


    ?€¢
    Crankshaft position (CKP) sensors activity--If there is a CKP sensor condition, refer to the applicable DTC.


    ?€¢
    Camshaft position (CMP) signal activity--If there is a CMP signal condition, refer to the applicable DTC.


    ?€¢
    Engine coolant temperature (ECT)--If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.

  6. Enable the crankshaft position system variation learn procedure with the scan tool and perform the following:
You best bet is take to the dealer ,unless you have a GM Tech2 factory scan tool .

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1 Answer

When driving my 1997 Audi A 4 1.8t there is a loss of power around 3000 rpm, what could be causing the issue?


run the fault codes and look for a problem area in the vane actuator of the turbo
it could be a sensor problem or a MAP sensor problem
this is indicated by the pressures being generated or not generated by a turbo generating pressure from the throttle opening on acceleration or held at constant speed

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Dtc po340 wont start put in new cam sensor still just cranks 42lbs fuel pressure at shrader valve has spark at plugs only code was po340 help


P0340 - Camshaft Position (CMP) Sensor Circuit Malfunction ,did you check the wiring ?
P0340 - Camshaft Position (CMP) Sensor Circuit Malfunction The test fails when the PCM can no longer detect the signal from the CMP sensor.
  • CMP circuit open
  • CMP circuit short to GND
  • CMP circuit short to PWR
  • SIG RTN open (VR sensor)
  • CMP GND open (Hall effect sensor)
  • CMP misinstalled (Hall effect sensor)
  • Damaged CMP sensor shielding
  • Damaged CMP sensor
  • Damaged PCM
Harness routing, harness alterations, improper shielding, or electrical interference from other improperly functioning systems may have intermittent impact on the CMP signal. DR1 DTC P0340: CHECK IF ENGINE WILL START
    Note: Refer to the Pinpoint Test Schematic to determine the type of CMP sensor.
  • Start engine.
Will the engine start? Yes No GO to DR2 . DTC P0340 is not the cause of the No Start. GO to Section 3 to diagnose the No Start symptom. Is the PCM firing the injectors ?
  • Starting Concerns:
    • No Start, Normal Crank
Note: Extended cranking because of a no start can load the exhaust system with raw fuel, damaging the catalytic converter after the engine starts. For applications with Secondary Air Injection (AIR) Systems, perform the following after the no start has been repaired: Disconnect the electric secondary air injection (AIR) solid state relay, run the engine until the surplus fuel is used up, and reconnect the relay (disconnecting the relay may set a Continuous Memory PCM DTC that will need to be cleared).


SYSTEM/COMPONENT REFERENCE (Section 5 Pinpoint Test unless noted)
  • Add-on Anti-Theft Devices
  • Visual, check with customer.
  • Fuel/Ignition
  • For LS6/LS8:
  • GO to KB85 .
  • All others:
  • GO to A1 .
  • If engine is now a no start:
  • If engine will start and run normally at part throttle, check Idle Air Control (IAC) System.
  • Engine will now start and run normally at part throttle:
  • GO to KE2
  • Exhaust System (restrictions)
  • GO to HF1
  • Base Engine
  • Engine System - General Information Section 303-00 of the Workshop Manual.
  • Additional Testing
  • GO to Z1

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Hi there:
DTC P0340 - CMP (Camsahft Position) Sensor Circuit Malfunction

CHeck details HERE.

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Problem with 1991 Oldsmobile 98


Sounds like a clogged catylitic convertor. That burning smell is over heating catylitic

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1997 toyota camry how do you fix a p0340 camshaft sensor A_ bank 1 circuit malfunction


Well, a lot depends on what is causing the P0340 Diagnostic Test Code (DTC) to set.

The Camshaft Position Sensor (CMP) is a pick-up coil mounted in the outer corner of the left cylinder head just below the valve cover (assuming your Camry is equipped with a V-6...you didn't say)
a one tooth signal plate is mounted to the outer camshaft. DTC P0340 sets when there is no signal recieved from the sensor by the Engine Control Module (ECM) either during engine cranking or engine running.
Possible causes are:
> Open or short circuit in CMP sensor circuit
> Faulty CMP sensor
> Defective starter
> Damaged cam signal plate
> Broken timing belt
> Internal ECM problem
Proper diagnosis required.

Jun 09, 2012 | 1997 Toyota Camry

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I have a 1996 Geo prizm automatic 1.6L with a code P0340 Left bank. Single Bank 1. What does that mean? It is saying Camshaft Position Sensor. Where is this located? How do I go about fixing it? Please...


  • If you want to dig into the timing belt you can but I would start by replacing the dizzy, if it were me. No junkyard parts for this. Re-manufactured if not new.

  • Hope this helps.
regards,Tony

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