SFI SYSTEM (w/ EGR 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 (G2 signal) 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 MR element, 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 following conditions is met:


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

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

  • Open or short in camshaft position sensor circuit

  • Camshaft position sensor

  • Intake camshaft

  • Jumped tooth of timing chain

  • ECM
P0342 Output voltage of camshaft position sensor below 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

  • ECM
P0343 Output voltage of camshaft position sensor higher than 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

  • 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.

MONITOR DESCRIPTION

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

MONITOR STRATEGY

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

CONFIRMATION DRIVING PATTERN


  1. Put the engine in inspection mode (maintenance mode) Click here.

  2. Start the engine and run it at idle for 10 seconds or more.

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. INSPECT CAMSHAFT POSITION SENSOR (POWER SOURCE)


    1. A003YSVE63
      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
      D18-3 (VC) - Body ground Power switch on (IG) 4.5 to 5.0 V

    NG

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

    OK

  2. 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
      Tester Connection Condition Specified Condition
      D18-1 (VVI+) - D27-76 (G2+) Always Below 1 Ω
      D18-2 (VVI-) - D27-122 (G2-) Always Below 1 Ω
      D18-1 (VVI+) or D27-76 (G2+) - Body ground Always 10 kΩ or higher
      D18-2 (VVI-) or D27-122 (G2-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)


    1. A003ZWOE17

      Check the camshaft position sensor installation.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL SENSOR Click here

    OK

  4. INSPECT INTAKE CAMSHAFT (TIMING ROTOR)


    1. Check the timing rotor of the intake camshaft.

      OK
      Timing rotor does not have any cracks or deformation.

    NG

    REPLACE INTAKE CAMSHAFT Click here

    OK

  5. REPLACE CAMSHAFT POSITION SENSOR


    1. Replace the camshaft position sensor Click here.


    NEXT

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

    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

  7. ADJUST VALVE TIMING

    A003WIAE02
    Text in Illustration
    *a Top
    *b Alignment Mark
    *c 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

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

    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 is output B

      Tech Tips

      If the engine does not start, replace the ECM.


    B

    REPLACE ECM Click here

    A

    END

  9. 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
      Tester Connection Condition Specified Condition
      D18-3 (VC) - D27-99 (VCV1) Always Below 1 Ω
      D18-3 (VC) or D27-99 (VCV1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here