SFI SYSTEM, Diagnostic DTC:P0340, P0342, P0343

DTC Code DTC Name
P0340 Camshaft Position Sensor Circuit Malfunction
P0342 Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)
P0343 Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)

DESCRIPTION

The camshaft position sensor for the intake camshaft (G signal sensor) consists of a magnet and MRE (Magneto Resistance Element).

The camshaft has a timing rotor for the camshaft position sensor. When the camshaft rotates, changes occur in the air gaps between the timing rotor and MRE, which affects the magnet. As a result, the resistance of the MRE material fluctuates. The camshaft position sensor converts the camshaft rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, are sends it to the ECM. Then the ECM uses this data to control fuel injection time and injection timing.

DTC No. DTC Detection Condition Trouble Area
P0340

When one of the following conditions is met:


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

  • No camshaft position sensor signal to ECM at engine speed of 600 rpm or higher (1 trip detection logic).

  • A missing camshaft position sensor signal despite the crankshaft position sensor inputs being normal at an engine speed of 600 rpm or higher (1 trip detection logic).

  • Open or short in camshaft position sensor (for intake camshaft) circuit

  • Camshaft position sensor (for intake camshaft)

  • Intake camshaft

  • Timing chain jumped tooth

  • ECM
P0342 The output voltage of the camshaft position sensor is below 0.3 V for 4 seconds (1 trip detection logic).

  • Open or short in camshaft position sensor (for intake camshaft) circuit

  • Camshaft position sensor (for intake camshaft)

  • ECM
P0343 The output voltage is higher than 4.7 V for 4 seconds (1 trip detection logic).

  • Open or short in camshaft position sensor (for intake camshaft) circuit

  • Camshaft position sensor (for intake camshaft)

  • ECM

Reference: Inspection using an oscilloscope.

A01EMAVE14

Tech Tips


  • The correct waveform is as shown.

  • G2 stands for the camshaft position sensor (for intake camshaft) signal and EV1 stands for the camshaft position sensor (for exhaust camshaft) signal.

Terminal No. (Symbol) Tool Setting Condition
B58-76 (G2+) - B58-122 (G2-) 5 V/DIV, 20 ms/DIV Idling
B58-75 (EV1+) - B58-121 (EV1-) 5 V/DIV, 20 ms/DIV Idling

MONITOR DESCRIPTION

If no signal is transmitted by the camshaft position sensor despite the camshaft revolving, or the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

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

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

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

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

  5. Turn the ignition switch to ON and turn the GTS on.

  6. Start the engine.

  7. Idle the engine for 10 seconds or more.

  8. Enter the following menus: Powertrain / Engine / Trouble Codes.

  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 / Utility / All Readiness.

  11. Input the DTC: P0340, P0342 or P0343.

  12. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not 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

Refer to DTC P0335 Click here.

INSPECTION PROCEDURE

Tech Tips


  • Read freeze frame data using the GTS. 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.

  • If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.

PROCEDURE


  1. INSPECT CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) (POWER SOURCE)


    1. A01EIXYE57
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Camshaft Position Sensor (for Intake Camshaft))

      Disconnect the camshaft position sensor (for intake camshaft) connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B55-3 (VC) - Body ground Ignition switch ON 4.5 to 5.5 V

    NG

    CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM)


    1. Disconnect the camshaft position sensor (for intake camshaft) 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
      B55-1 (VVI+) - B58-76 (G2+) Always Below 1 Ω
      B55-2 (VVI-) - B58-122 (G2-) Always Below 1 Ω
      B55-1 (VVI+) or B58-76 (G2+) - Body ground Always 10 kΩ or higher
      B55-2 (VVI-) or B58-122 (G2-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))


    1. A01EJEOE25

      Check the camshaft position sensor (for intake camshaft) installation.

      OK
      Camshaft position sensor is installed correctly.

    NG

    SECURELY CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) Click here

    OK

  4. INSPECT INTAKE CAMSHAFT (TIMING ROTOR)


    1. Check 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

  5. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)


    1. Remove the cylinder head cover sub-assembly Click here.

      A01EM7ZE02
      Text in Illustration
      *1 Timing Mark - -

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

    3. Check that the timing marks of the camshaft timing gears are aligned with the timing marks 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 gears are aligned as shown in the illustration.

    NG

    ADJUST VALVE TIMING Click here

    OK

  6. REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)


    1. Replace the camshaft position sensor (for intake camshaft) Click here.


    NEXT

  7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342 OR P0343)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

    6. Start the engine.

    7. Turn the GTS on.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    9. Enter the following menus: Powertrain / Engine / Trouble Codes.

    10. Read the DTCs.

      Result
      Result Proceed to
      DTC P0340, P0342 or P0343 is output A
      DTC is not output B

      Tech Tips

      If the engine does not start, replace the ECM.


    B

    END

    A

    REPLACE ECM Click here

  8. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM)


    1. Disconnect the camshaft position sensor (for intake camshaft) 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
      B55-3 (VC) - B58-99 (VCV1) Always Below 1 Ω
      B55-3 (VC) or B58-99 (VCV1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here