СИСТЕМА SFI, Diagnostic DTC:P0340

DTC Code DTC Name
P0340 Camshaft Position Sensor Circuit Malfunction

DESCRIPTION

The camshaft position sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed on the cylinder head. When the camshaft rotates, each of the 3 teeth on the camshaft pass through the camshaft position sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft turns twice, the voltage is generated 3 times in the camshaft position sensor. The generated voltage in the sensor acts as a signal, allowing the ECM to locate the camshaft position. This signal is then used to control ignition timing, fuel injection timing, and the VVT system.

DTC No. DTC Detection Condition Trouble Area
P0340

When one of the following conditions is met:


  • No camshaft position sensor signal is sent to the ECM while cranking (2 trip detection logic).

  • The camshaft position sensor signal is missing despite the crankshaft position sensor input being normal at an engine speed of 600 rpm or more (1 trip detection logic).


  • Open or short in camshaft position sensor circuit

  • Camshaft position sensor

  • Camshaft timing gear assembly

  • Timing chain for intake camshaft jumped tooth

  • ECM

Tech Tips

DTC P0340 indicates a malfunction related to the camshaft position sensor (+) circuit (the wire harness between the ECM and camshaft position sensor, and the camshaft position sensor itself).


MONITOR DESCRIPTION

If no signal is transmitted by the camshaft position sensor despite the engine running, or the rotations of the camshaft and crankshaft are not synchronized, the ECM interprets this as a malfunction of the circuit.

MONITOR STRATEGY

Required Sensors/Components (Main) Camshaft position sensor
Required Sensors/Components (Related) Crankshaft position sensor
Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN


  1. Connect the intelligent tester to the DLC3.

  2. Turn the ignition switch to ON and turn the intelligent tester on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the ignition switch off and wait for at least 30 seconds.

  5. Turn the ignition switch to ON and turn the intelligent tester on.

  6. Start the engine.

  7. Idle the engine for 20 seconds or more.

  8. Enter the following menus: Powertrain / Engine and ECT / DTC.

  9. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  11. Input the DTC: P0340.

  12. Check the DTC judgment result.

    Intelligent Tester Display Description
    NORMAL
    • DTC judgment completed

    • System normal

    ABNORMAL
    • DTC judgment completed

    • System abnormal

    INCOMPLETE
    • DTC judgment completed

    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

A01BDGFE10

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE)


    1. Inspect the camshaft position sensor Click here.


    NG
    OK
  2. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)


    1. Disconnect the camshaft position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D10-1 - D97-94 (G2) Always Below 1 Ω
      D10-2 - D97-118 (G2-) Always Below 1 Ω
      D10-1 or D97-94 (G2) - Body ground Always 10 kΩ or higher
      D10-2 or D97-118 (G2-) - Body ground Always 10 kΩ or higher

    NG
    OK
  3. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)


    1. A01BD14E17

      Check the camshaft position sensor.

      OK
      Sensor is installed correctly.

    NG
    OK
  4. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (TEETH)


    1. Check the teeth of the camshaft timing gear assembly.

      OK
      Teeth do not have any cracks or deformation.

    NG
    OK
  5. REPLACE CAMSHAFT POSITION SENSOR


    1. Replace the camshaft position sensor Click here.


    NEXT
  6. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Clear the DTCs.

    5. Start the engine and idle it for 10 seconds or more.

    6. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    7. Read the DTCs.

      Result
      Result Proceed to
      No DTC is output A
      P0340 is output B

      Tech Tips

      If the engine does not start, replace the ECM.


    B
    A