SFI SYSTEM, Diagnostic DTC:P0340,P0342 and P0343

DTC Code DTC Name
P0340 Camshaft Position Sensor Circuit
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 (VV1 signal) for the intake camshaft consists of a magnet and MRE.

The 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 control fuel injection time and injection timing.

The crankshaft position sensor plate has 34 teeth. The pickup coil generates 34 signals for each crankshaft revolution. Based on the VV1 signal and actual intake 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

  • The input voltage to the ECM remains 0.3 V or less, or 4.7 V or higher for more than 5 seconds, when 2 or more seconds have elapsed after turning the ignition switch to ON (1 trip detection logic).

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

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

  • Camshaft position sensor (for intake side)

  • Intake camshaft

  • Jumped tooth of timing chain

  • ECM

P0342

The output voltage of the camshaft position sensor is 0.3 V or less for 5 seconds (1 trip detection logic).

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

  • Camshaft position sensor (for intake side)

  • Intake camshaft

  • Jumped tooth of timing chain

  • ECM

P0343

The output voltage of the camshaft position sensor is 4.7 V or higher for 5 seconds (1 trip detection logic).

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

  • Camshaft position sensor (for intake side)

  • Intake camshaft

  • Jumped tooth of timing chain

  • ECM
  • A255508E38

    Reference: Inspection using an oscilloscope.

    Tip:

    • The correct waveform is as shown.

    • VV1 stands for the camshaft position sensor (for intake side) signal, and EV1 stands for the camshaft position sensor (for exhaust side) signal.

    Item

    Content

    Terminals

    VV1: VV1+ - VV1-

    EV1: EV1+ - EV1-

    Equipment Settings

    5 V/DIV.

    20 ms./DIV.

    Conditions

    Idling with warm engine

WIRING DIAGRAM

Refer to DTC P0335 (Click here).

CAUTION / NOTICE / HINT

Tip:

  • 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, troubleshoot the engine mechanical system.

PROCEDURE

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO 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. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    5. Read the DTCs.

      Table 1. Result

      Result

      Proceed to

      DTC P0340, P0342 or P0343 is output

      A

      DTC P0340, P0342 or P0343 and other DTCs are output

      B
      Tip:

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

    GO TO DTC CHART

    (Click here)

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

    1. U121762E02

      Disconnect the camshaft position sensor (for intake side) 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

      C33-3 (VC) - Body ground

      Ignition switch ON

      4.5 to 5.5 V
      Table 2. Text in Illustration

      *a

      Front view of wire harness connector

      (to Camshaft Position Sensor (for Intake Side))

    4. Reconnect the camshaft position sensor (for intake side) connector.

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

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

    1. Disconnect the camshaft position sensor (for intake side) 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

      C33-1 (VV1+) - C111-82 (VV1+)

      Always

      Below 1 Ω

      C33-2 (VV1-) - C111-115 (VV1-)

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      C33-1 (VV1+) or C111-82 (VV1+) - Body ground

      Always

      10 kΩ or higher

      C33-2 (VV1-) or C111-115 (VV1-) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the camshaft position sensor (for intake side) connector.

    5. Reconnect the ECM connector.

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT POSITIONSENSOR (FOR INTAKE SIDE) - ECM)

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

    1. A208464E02

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

      OK

      Sensor is installed correctly.

    SECURELY REINSTALL CAMSHAFT POSITION SENSOR (FOR INTAKE SIDE)

    (Click here)

  5. CHECK INTAKE CAMSHAFT

    1. Check the teeth of the intake camshaft.

      OK

      Camshaft teeth do not have any cracks or deformation.

      Tip:

      Perform "Inspection After Repair" after replacing the camshaft housing (Click here).

    REPLACE CAMSHAFT HOUSING

    (Click here)

  6. REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE SIDE)

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

  7. CHECK WHETHER DTC OUTPUT RECURS

    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. Start the engine.

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

    7. Read the DTCs.

      Table 3. Result

      Result

      Proceed to

      DTC P0340, P0342 or P0343 is output

      A

      DTC is not output

      B
      Tip:

      If the engine does not start, replace the ECM.

    END

  8. CHECK ENGINE MECHANICAL SYSTEM

    1. Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain (Click here).

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

  9. CHECK WHETHER DTC OUTPUT RECURS

    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. Start the engine.

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

    7. Read the DTCs.

      Table 4. Result

      Result

      Proceed to

      DTC is not output

      A

      DTC P0340, P0342 or P0343 is output

      B
      Tip:

      If the engine does not start, replace the ECM.

    END

    REPLACE ECM

    (Click here)

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

    1. Disconnect the camshaft position sensor (for intake side) 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

      C33-3 (VC) - C111-116 (VCV1)

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      C33-3 (VC) or C111-116 (VCV1) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the camshaft position sensor (for intake side) connector.

    5. Reconnect the ECM connector.

    REPLACE ECM

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT POSITIONSENSOR (FOR INTAKE SIDE) - ECM)