SFI SYSTEM, Diagnostic DTC:P0340, P0342, P0343, P0345, P0347, P0348

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)
P0345 Camshaft Position Sensor "A" Circuit (Bank 2)
P0347 Camshaft Position Sensor "A" Circuit Low Input (Bank 2)
P0348 Camshaft Position Sensor "A" Circuit High Input (Bank 2)

DESCRIPTION

The VVT sensor (for intake camshaft) (VV1, VV2 signal) consists of a magnet and MRE (Magneto Resistance Element).

The camshaft timing gear assembly has a sensor plate for the VVT sensor. When the intake camshaft rotates, changes occur in the air gaps between the sensor plate and MRE, which affects the magnetic field. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the intake camshaft rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM.

Then the ECM uses this data to control fuel injection duration, fuel injection timing and Variable Valve Timing (VVT) system.

DTC No. DTC Detection Condition Trouble Area
P0340

One of the following conditions is met:


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

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

  • No VVT sensor signal to ECM while cranking (2 trip detection logic).

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

  • VVT sensor (for intake camshaft)

  • Camshaft timing gear assembly

  • Valve timing

  • ECM

P0342

P0347

 The output voltage of the VVT sensor is less than 0.3 V for 4 seconds (1 trip detection logic).

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

  • VVT sensor (for intake camshaft)

  • ECM

P0343

P0348

 The output voltage of the VVT sensor is higher than 4.7 V for 4 seconds (1 trip detection logic).

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

  • VVT sensor (for intake camshaft)

  • ECM
P0345 No VVT sensor signal at engine speed of 600 rpm or higher (1 trip detection logic).

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

  • VVT sensor (for intake camshaft)

  • Camshaft timing gear assembly

  • Valve timing

  • ECM

Tech Tips

Reference: Inspection using an oscilloscope Click here.

MONITOR DESCRIPTION

If no pulse signal is transmitted by the VVT sensor (for intake camshaft) despite the camshaft rotating, 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 less than 0.3 V, or higher than 4.7 V for 4 seconds, the ECM stores a DTC.

MONITOR STRATEGY

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

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

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

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

  5. Turn the engine switch on (IG) 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, P0343, P0345, P0347 or P0348.

  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


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

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transaxle.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

  • 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.

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF VVT SENSOR (FOR INTAKE CAMSHAFT))


    1. A01G4L7E83
      Text in Illustration
      *1 Bank 1
      *2 Bank 2
      *a

      Front view of wire harness connector

      (to VVT Sensor (for Intake Camshaft))

      Disconnect the VVT sensor (for intake camshaft) connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D49-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.5 V
      D55-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.5 V

    NG

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

    OK

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


    1. Disconnect the VVT 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
      D49-1 (VVR+) - D23-81 (VV1+) Always Below 1 Ω
      D49-2 (VVR-) - D23-110 (VV1-) Always Below 1 Ω
      D55-1 (VVL+) - D23-78 (VV2+) Always Below 1 Ω
      D55-2 (VVL-) - D23-110 (VV1-) Always Below 1 Ω
      D49-1 (VVR+) or D23-81 (VV1+) - Body ground Always 10 kΩ or higher
      D49-2 (VVR-) or D23-110 (VV1-) - Body ground Always 10 kΩ or higher
      D55-1 (VVL+) or D23-78 (VV2+) - Body ground Always 10 kΩ or higher
      D55-2 (VVL-) or D23-110 (VV1-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01G55PE17

      Check the VVT sensor (for intake camshaft) installation.

      OK
      VVT sensor is installed correctly.

    NG

    SECURELY REINSTALL VVT SENSOR (FOR INTAKE CAMSHAFT) Click here

    OK

  4. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF SENSOR PLATE)


    1. Inspect the teeth of the sensor plate.

      OK
      Sensor plate teeth do not have any cracks or deformation.

      Tech Tips

      Perform "Inspection After Repair" after replacing the camshaft timing gear assembly Click here.


    NG

    REPLACE CAMSHAFT TIMING GEAR ASSEMBLY Click here

    OK

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


    1. A01G674E03
      Text in Illustration
      *1 Timing Mark

      Remove the cylinder head cover sub-assemblies RH and LH Click here.

    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 assemblies and camshaft timing exhaust gear assemblies are aligned with the timing marks of the bearing cap as shown in the illustration.

      Tech Tips

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

      OK
      The timing marks on the camshaft timing gear assemblies and camshaft timing exhaust gear assemblies are aligned as shown in the illustration.

    NG

    ADJUST VALVE TIMING Click here

    OK

  6. REPLACE VVT SENSOR (FOR INTAKE CAMSHAFT)


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


    NEXT

  7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342, P0343, P0345, P0347 OR P0348)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

    5. Turn the engine 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 the Confirmation Driving Pattern.

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

    10. Read the DTCs.

      Result
      Result Proceed to
      DTC P0340, P0342, P0343, P0345, P0347 or P0348 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 (VVT SENSOR (FOR INTAKE CAMSHAFT) - ECM)


    1. Disconnect the VVT 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
      D49-3 (VC) - D23-111 (VCV1) Always Below 1 Ω
      D55-3 (VC) - D23-111 (VCV1) Always Below 1 Ω
      D49-3 (VC) or D23-111 (VCV1) - Body ground Always 10 kΩ or higher
      D55-3 (VC) or D23-111 (VCV1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here