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 intake camshaft (G2 signal sensor) consists of a magnet and MRE (Magnet 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, and uses the pulse signals to determine the camshaft angle, which it sends 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 ether of the following conditions is met: (1 trip detection logic)


  • No camshaft position sensor signal to ECM at engine speed 600 rpm or more

  • Missing camshaft position sensor signal despite crankshaft position sensor inputs normal at engine speed of 600 rpm or more

  • Open or short in camshaft position sensor circuit

  • Camshaft position sensor

  • Intake camshaft

  • Jumped tooth of timing chain for intake camshaft

  • ECM
P0342

Output voltage of camshaft position sensor less than 0.3 V for 4 seconds

(1 trip detection logic)

  • Open or short in camshaft position sensor circuit

  • Camshaft position sensor

  • Intake camshaft

  • Jumped tooth of timing chain for intake camshaft

  • ECM
P0343

Output voltage of 4.7 V for 4 seconds

(1 trip detection logic)

  • Open or short in camshaft position sensor circuit

  • Camshaft position sensor

  • Intake camshaft

  • Jumped tooth of timing chain for intake camshaft

  • 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.

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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

  • 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 power switch on (IG).

    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 and P0343 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK CAMSHAFT POSITION SENSOR (POWER SOURCE VOLTAGE)


    1. A003TV8E29
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Camshaft Position Sensor)

      Disconnect the camshaft position sensor connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B21-3 (VC) - Body ground Power switch on (IG) 4.5 to 5.0 V

    4. Reconnect the camshaft position sensor connector.


    NG

    CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) 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
      B21-1 (VVI+) - B31-76 (G2+) Always Below 1 Ω
      B21-2 (VVI-) - B31-122 (G2-) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B21-1 (VVI+) or B31-76 (G2+) - Body ground Always 10 kΩ or higher
      B21-2 (VVI-) or B31-122 (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 - ECM)

    OK

  4. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)


    1. A003SQ3E17

      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. 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

  6. REPLACE CAMSHAFT POSITION SENSOR


    1. Replace the camshaft position sensor Click here.


    NEXT

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs Click here.

    5. Put the engine in inspection mode Click here.

    6. Start the engine and wait for 10 seconds.

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

    8. 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

    A003RGXE01
    Text in Illustration
    *1 Top
    *2 Alignment Mark
    *3 No. 1 Cylinder at TDC Compression

    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 reinstall the chain to match-up the alignment marks Click here.


    NEXT

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs Click here.

    5. Put the engine in inspection mode Click here.

    6. Start the engine and wait for 10 seconds.

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

    8. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P0340, P0342 or P0343 is 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 - 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
      B21-3 (VC) - B31-99 (VCV1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B21-3 (VC) or B31-99 (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 - ECM)

    OK

    REPLACE ECM Click here