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 intake camshaft's Variable Valve Timing (VVT) sensor (G signal) consists of a magnet and MRE.

The VVT camshaft has a timing rotor with 3 teeth on its outer circumference. 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 gear rotation data to pulse signals, and uses the pulse signals to determine the camshaft angle, which it sends to the ECM. Then the ECM uses this data to the control fuel injection time and injection timing.

The crankshaft position sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine revolution. Based on the G signal and actual crankshaft angle, the ECM detects the normal crankshaft angle. Also, based on the NE signal, the ECM detects the engine speed.

DTC No. DTC Detection Condition Trouble Area
P0340

  • Input voltage to ECM remains 0.3 V or less, or 4.7 V or higher for more than 5 seconds, when 2 more seconds have elapsed after turning ignition switch to ON

    (1 trip detection logic)

  • No camshaft position sensor signal to ECM during cranking

    (2 trip detection logic)

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

  • Camshaft position sensor for intake camshaft

  • Intake camshaft

  • Jumped tooth of timing chain

  • ECM
P0342

Output voltage of camshaft position sensor 0.3 V or less is for 5 seconds

(1 trip detection logic)

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

  • Camshaft position sensor for intake camshaft

  • Intake camshaft

  • Jumped tooth of timing chain

  • ECM
P0343

Output voltage of camshaft position sensor 4.7 V or more is for 5 seconds

(1 trip detection logic)

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

  • Camshaft position sensor for intake camshaft

  • Intake camshaft

  • Jumped tooth of timing chain

  • ECM

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.

  • 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, P0342 OR P0343)


    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, P0342 or P0343 is output A
      DTC P0340, P0342 or P0343 and other DTCs are output B

      Tech Tips

      If any DTCs other than P0340, P0342 or P0343 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK CAMSHAFT POSITION SENSOR FOR INTAKE CAMSHAFT (SENSOR POWER SOURCE)


    1. A005RFGE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Camshaft Position Sensor)

      Disconnect the camshaft position sensor 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 Switch Condition Specified Condition
      B22-3 (VC) - Body ground Ignition switch ON 4.5 to 5.0 V

    4. Reconnect the camshaft position sensor connector.


    NG

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

    OK

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


    1. A005TYGE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Camshaft Position Sensor)
      *2

      Front view of wire harness connector

      (to ECM)

      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
      B22-1 (VV1+) - B39-94 (G2+) Always Below 1 Ω
      B22-2 (VV1-) - B39-118 (G2-) Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      B22-1 (VV1+) or B39-94 (G2+) - Body ground Always 10 kΩ or higher
      B22-2 (VV1-) or B39-118 (G2-) - 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 FOR INTAKE CAMSHAFT - ECM)

    OK

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


    1. A005RJDE02

      Check the camshaft position sensor installation.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL CAMSHAFT POSITION SENSOR FOR INTAKE CAMSHAFT Click here

    OK

  5. CHECK INTAKE CAMSHAFT


    1. Check the teeth of the intake camshaft.

      OK
      Camshaft teeth do not have any cracks or deformation.

    NG

    REPLACE CAMSHAFT HOUSING Click here

    OK

  6. REPLACE CAMSHAFT POSITION SENSOR FOR INTAKE CAMSHAFT


    1. Replace intake camshaft position sensor Click here.


    NEXT

  7. CHECK WHETHER DTC OUTPUT RECURS


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

    7. 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

  8. ADJUST VALVE TIMING

    Tech Tips

    There are no marks on the cylinder head to match-up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and re-install the chain to match-up the timing marks Click here.


    NEXT

  9. CHECK WHETHER DTC OUTPUT RECURS


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

    7. Read the DTCs.

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

      Tech Tips

      If the engine does not start, replace the ECM.


    B

    REPLACE ECM Click here

    A

    END

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


    1. A005TYGE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Camshaft Position Sensor)
      *2

      Front view of wire harness connector

      (to ECM)

      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
      B22-3 (VC) - B39-119 (VCV1) Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      B22-3 (VC) or B39-119 (VCV1) - 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 FOR INTAKE CAMSHAFT - ECM)

    OK

    REPLACE ECM Click here