SFI SYSTEM, 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 to the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes 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 following conditions is met:


  • No camshaft position sensor signal to ECM while cranking

    (2 trip detection logic)

  • Camshaft / crankshaft misalignment detected at engine speed of 600 rpm or more

    (1 trip detection logic)

  • Open or short in camshaft position sensor circuit

  • Camshaft position sensor

  • Intake camshaft

  • Jumped tooth of timing chain

  • ECM

Tech Tips

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

Reference: Inspection using an oscilloscope Click here.

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 sensor.

Also, when the sensor output voltage remains below 0.3 V, or higher than 4.7 V for more than 4 seconds, the ECM stores a DTC.

CONFIRMATION DRIVING PATTERN


  1. Turn the ignition switch to ON and wait for 10 seconds or more.

WIRING DIAGRAM

Refer to DTC P0335 Click here.

CAUTION / NOTICE / HINT

Tech Tips


  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition 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.

  • If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0340)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0340 is output A
      DTC P0340 and other DTCs are output B

      Tech Tips

      If any DTCs other than P0340 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. INSPECT CAMSHAFT POSITION SENSOR


    1. Inspect the camshaft position sensor Click here.


    NG

    REPLACE CAMSHAFT POSITION SENSOR Click here

    OK

  3. 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 (Check for Open)
      Tester Connection Condition Specified Condition
      B30-1 - B23-82 (VV1+) Always Below 1 Ω
      B30-2 - B23-110 (NE-) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B30-1 or B23-82 (VV1+) - Body ground Always 10 kΩ or higher
      B30-2 or B23-110 (NE-) - Body ground Always 10 kΩ or higher

    4. Reconnect the camshaft position sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

    OK

  4. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)


    1. A005KRFE01
      Text in Illustration
      *a OK
      *b NG
      *c Clearance

      Check the camshaft position sensor installation.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL SENSOR Click here

    OK

  5. INSPECT INTAKE CAMSHAFT (TIMING ROTOR)


    1. Inspect the timing rotor of the intake camshaft.

      OK
      Camshaft timing rotor does not have any cracks or deformation.

    NG

    REPLACE INTAKE CAMSHAFT Click here

    OK

  6. REPLACE CAMSHAFT POSITION SENSOR


    1. Replace the camshaft position sensor Click here.


    NEXT

  7. CHECK WHETHER DTC OUTPUT RECURS (P0340)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Clear the DTCs Click here.

    5. Start the engine.

    6. Idle the engine for 10 seconds or more.

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

    8. Read the pending DTCs.

      Result
      Result Proceed to
      DTC P0340 is output A
      DTC is not output B

      Tech Tips

      If the engine does not start, replace the ECM.


    A

    REPLACE ECM Click here

    B

    END