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I have a 1999 ford escort 4 cylinder. and i have dtc p0340 cam position sensor A circuit fault. i changed the sensor and thye light still comes on and it keeps stalling out immediately.

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Posted on Jan 02, 2017

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SOURCE: 03 Taurus with DTC P0340, P1336

I would think it would be just the Camshaft Position Sensor.I looked up the codes and they say pretty much the samething.


P0340 Ford Camshaft Position Sensor Circuit Malfunction


P1336 Ford Crankshaft/Camshaft Sensor Range/Performance












Posted on Jan 18, 2009

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emissionwiz
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SOURCE: Code: P0340 Cam shaft position

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, yes the crank sensor can set this code as well
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

Posted on Oct 23, 2010

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2 Answers

Car starts and runs but in reverse starts shaking SES lights up and blinks. Have changed the plugs but are getting a P0340. It's an 1998 Saturn 112,000 miles. What could it be?


DTC P0340 will set if the PCM voltage on cylinder #4 signal wire is not pulled to ground (cam signal pulse) when:
Diagnostic Aids
Important: A cam pulse missing may not affect engine operation.
?€¢
An open or high resistance on the #1 plug wire or plug will result in DTC P0340 setting.


?€¢
Inspect the EIS towers and plug the wire connections for corrosion or other signs of poor retention at connections.


The electronic ignition (EI) module supplies a signal to the PCM whenever it determines that the #4 cylinder fired on its compression stroke. Because of opposite coil tower polarity, the simultaneous fir of #1 and #4 cylinders are of opposite polarity as well. Under most conditions, except decel, the waste spark cylinder fires before the compression cylinder in sequence. The EI module can determine this polarity sequence and voltage amplitude by using capacitive pickup plates located under the 1/4 coil. If the module senses a positive to negative sequence and high negative spike when #4 is on TDC, it pulls the PCM cam signal to ground signaling that #4 has just fired on compression. This signal along with the double pulse received from the CKP sensor, synchronizes spark and fuel timing.
Beside plugs , plug wires need to be replaced as well !

Aug 26, 2016 | Saturn Cars & Trucks

1 Answer

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

Oct 19, 2015 | 1998 Ford Escort

1 Answer

I changed out the MAP sensor,and the idle air sensor on my 2006 Ford Taurus. This was before I had the fault code read at a dealer. Code came back as P0340, and P0430 Band 2 cat worn out. I had the cam...


P0340 FORD - Camshaft Position Sensor Circuit Bank 1 Sensor 1Possible 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
P0340 FORD Description The Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. This information is used by the Engine Control Module(ECM) to control ignition and fuel injection. The camshaft position sensor senses the retraction of camshaft (intake) to identify a particular cylinder. The camshaft position sensor senses the piston position. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor.

When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.

When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various controls of engine parts instead, utilizing timing of cylinder identification signals.
P0430, main catalyst is worn out.

Dec 04, 2012 | 2006 Ford Taurus

1 Answer

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

1 Answer

Ford f350 crew cab super duty 7.3 diesel runs rough and turns off randomly while driving sometimes restarts in neutral allot of times i have to stop and put it in park turn key completely off position I...


This is a case of which came first.
The stalling is most likely caused by your Cam Sensor. The description for Diagnostic Test Code (DTC) P0340 is "cam sensor circuit malfunction" This is a VERY COMMON problem on 7.3L diesel engines. Ford has had a lot of trouble with these.

The description for DTC P0470 is "exhaust back-pressure sensor circuit malfunction" This code can be caused by the EBP sensor, the circuits to the EBP sensor or a faulty Powertrain Control Module (PCM)

The description of DTC P1211 is "Injection Control Pressure (ICP) above or below desired" This can be caused by the engine stalling. It can also be caused by several other things, including low engine oil level or a possible faulty PCM. (Check you engine oil level FIRST.)

The troubleshooting charts needed to properly diagnose DTCs P0470 and P1211 depend on whether these codes are Key-On-Engine-Off (KOEO), Key-On-Engine-Running (KOER), or "continuous memory" codes. If you retrieved these codes with a generic OBD scan tool, then they are definately present in "continuous memory". However, a scan tool with the capabilities to read KOEO and KOER codes MUST be used to determine if these are "HARD" or "INTERMIITTENT" faults. The troubleshooting steps vary greatly depending on this information.

Personally, I would start with the lowest number code first (P0340). Replace the cam sensor. Please note: this is the MOST LIKELY cause of the problem, but not the only POSSIBLE cause. Then clear all the fault codes and drive the truck to see if this or the other codes return.

Jun 11, 2011 | 1999 Ford F250 Regular Cab

1 Answer

I have a 96 explorer 4.0 4wd, failed emissions DTC codes P0125, P0756, P0340....are these costly repairs?


P0125 is Insufficient Coolant Temp For Closed Loop Fuel Control

P0756 is Shift Solenoid B Performance or Stuck Off
P0340 is Camshaft Position Sensor Circuit Malfunction

The P0125 can probably be cleared by replacing the thermostat. That part is under $15.00
The P0340 can probably be cleared by replaceing the Cam position sensor. That part is about $25.00

The P0756 is a transmission issue and It will involve removing the fluid pan and taking out the valve body to get to the solenoid.

The thermostat and cam sensor should take about an hour of shop time to change so I would figure about $150.00 to $200.00..Depends on the shop and if there is a minumum charge. Some shops charge 4 hrs. min.

the trans issue may get involved so I don't really want to make a guess, but I would say less than $500.00, depends on what all is involved in getting to the solenoid and changing it.

Jan 17, 2011 | 1996 Ford Explorer

1 Answer

Santa fee 2002 2.4l dtc p0340-p0401-p0102-p0340 again


HI P0340 IS CAM SENSOR CIRCUIT MALFUNCTION P0401 EGR FLOW INSUFFICIENT P0102 MAF CIRCUIT LOW GOOD LUCK

Sep 02, 2009 | 1999 Ford Escort

1 Answer

A p0340 trouble code and i changed the cam position sensor and all 4 o2 sensor's on a 01 ford mustang gt with a 4.6


Code P0340 is a camshaft position sensor CIRCUIT fault. This means it can be a bad sensor, wiring fault (loose connector, short, open), or even a bad PCM. Since you've already changed the camshaft position sensor you've eliminated that possibility. It's time to do some electrical troubleshooting. That, of course, depends upon your skill set for this type of work and equipment (mostly a good dmm and schematics). If you're not equipped for this then you'll likely have to seek assistance from a local shop.

If this reply answers your question then please take a moment to rate this post. - Thanks.

Jun 30, 2009 | 2001 Ford Mustang

1 Answer

03 Taurus with DTC P0340, P1336


I would think it would be just the Camshaft Position Sensor.I looked up the codes and they say pretty much the samething.


P0340 Ford Camshaft Position Sensor Circuit Malfunction


P1336 Ford Crankshaft/Camshaft Sensor Range/Performance












Jan 18, 2009 | 2003 Ford Taurus

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