SFI SYSTEM, Diagnostic DTC:P0340

DTC Code DTC Name
P0340 Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)

DESCRIPTION

The camshaft position sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed onto the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes 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 either of following conditions is met:


  • No camshaft position sensor signal to ECM while cranking (1 trip detection logic)

  • Missing camshaft position sensor signal despite crankshaft position sensor signal inputs normal at engine speed of 600 rpm or more (1 trip detection logic)

  • Open or short in camshaft position sensor circuit

  • Camshaft position sensor

  • Camshaft

  • Timing chain jumped a tooth

  • 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

A01CEBXE34

Tech Tips


  • The correct waveform is as shown in the illustration.

  • G2+ stands for the camshaft position sensor signal, and NE+ stands for the crankshaft position sensor signal.

  • A failure of the ground for the shielding of the wiring may result in noisy waveforms.

ECM Terminal Name

CH1: Between G2+ and G2-

CH2: Between NE+ and NE-
Tester Range 5 V/DIV., 20 ms/DIV.
Condition Idling with warm engine

WIRING DIAGRAM

Refer to DTC P0335 Click here.

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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)

    A01CF2VE10
    Text in Illustration
    *1

    Component without harness connected

    (Camshaft Position Sensor)

    1. Disconnect the camshaft position sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Cold 835 to 1400 Ω
      1 - 2 Hot 1060 to 1645 Ω

      Note

      Terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F).

    3. Reconnect the camshaft position sensor connector.


    NG

    REPLACE CAMSHAFT POSITION SENSOR Click here

    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 (Check for Open)
      Tester Connection Condition Specified Condition
      D62-1 - D41-99 (G2+) Always Below 1 Ω
      D62-2 - D41-98 (G2-) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D62-1 or D41-99 (G2+) - Body ground Always 10 kΩ or higher
      D62-2 or D41-98 (G2-) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the camshaft position sensor connector.


    NG

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

    OK

  3. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)

    A01CFPDE64

    1. Check the camshaft position sensor installation.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL CAMSHAFT POSITION SENSOR Click here

    OK

  4. CHECK VALVE TIMING

    A01CAMGE03
    Text in Illustration
    *1 Timing Mark
    *2 Front Mark
    *3 Groove

    1. Remove the cylinder head cover sub-assembly.

    2. Turn the crankshaft pulley, and align its groove with the "0" timing mark of the timing chain cover.

    3. Check that the timing marks of the camshaft timing gear assembly and camshaft timing sprocket are aligned with the front marks located on the No. 1 and No. 2 bearing caps as shown in the illustration.

      Tech Tips

      If the timing marks are not as shown, turn the crankshaft one revolution clockwise.

      OK
      Timing marks on camshaft timing gear assembly and camshaft timing sprocket are aligned as shown in the illustration.

    NG

    ADJUST VALVE TIMING Click here

    OK

  5. INSPECT CAMSHAFT


    1. Check the teeth of the camshaft.

      OK
      Camshaft teeth do not have any cracks or deformation.

    NG

    REPLACE CAMSHAFT Click here

    OK

  6. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs Click here.

    5. Start the engine.

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

    7. Read the DTCs.

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

      Tech Tips

      If the engine does not start, replace the ECM.


    B

    REPLACE ECM Click here

    A

    END