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 system consists of a timing rotor (installed on each camshaft) and magnetic resistance element type VVT sensor. The timing rotor (camshaft) has 3 protrusions. When it rotates, the magnetic vector (direction of magnetic field) applied to the VVT sensor's magnetic resistance element varies, which causes its resistance to vary. This varying resistance is converted to voltage, and then modified into a rectangular waveform with Hi (approximately 4 V) and Lo (approximately 1 V) outputs. As a result, the actual camshaft's position is detected and the position is output to the ECM.

DTC No. DTC Detection Condition Trouble Area

P0340

P0345

No VVT sensor signal for intake side (bank 1, 2) to ECM at engine speed 600 rpm or more

(1 trip detection logic)

  • Open or short in VVT sensor for intake side (bank 1, 2) circuit

  • VVT sensor for intake side (bank 1, 2)

  • Intake camshaft

  • ECM

P0342

P0347

Output voltage of VVT sensor for intake side (bank 1, 2) less than 0.3 V for 4 seconds

(1 trip detection logic)

P0343

P0348

Output voltage of VVT sensor for intake side (bank 1, 2) more than 4.7 V for 4 seconds

(1 trip detection logic)
A015Z7OE02

Tech Tips


  • The correct waveform is as shown.

  • The wavelength becomes shorter as the engine speed increases.

  • VV1+ and VV2+ stand for the VVT sensor (for intake side) signal, and NE+ stands for the crankshaft position sensor signal.

Item Content
Terminal

NE+ - NE-

VV1+ - VV1-

VV2+ - VV2-
Equipment Setting 5 V/DIV., 20 msec./DIV.
Condition Cranking or idling

MONITOR DESCRIPTION

If no signal is transmitted by the VVT sensor despite the engine revolution, the ECM interprets this as a malfunction of the sensor.

When the sensor output voltage remains less than 0.3 V, or more than 4.7 V for more than 4 seconds, the ECM sets a DTC.

WIRING DIAGRAM

A015YI7E08

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 by this diagnostic troubleshooting procedure, troubleshooting the engine mechanical system.

PROCEDURE


  1. CHECK ECM TERMINAL VOLTAGE


    1. A01608NE02

      Inspect the ECM using an oscilloscope.


      1. While the engine is idling, check the waveform between the terminals of the ECM connector.

        Standard Voltage
        Tester Connection Condition Specified Condition
        E3-27 (NE+) - E3-34 (NE-) Engine idling Correct waveform appears as shown
        E4-25 (VV1+) - E4-33 (VV1-)
        E5-19 (VV2+) - E5-29 (VV2-)
      Result
      Result Proceed to
      NG A
      OK B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. CHECK VVT SENSOR FOR INTAKE SIDE (SENSOR POWER SOURCE)


    1. A0162HXE01

      Disconnect the VVT sensor for intake side 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 Switch Condition Specified Condition
      E30-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.0 V
      E70-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.0 V

    4. Reconnect the VVT sensor connector.


    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)


    1. Disconnect the VVT 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
      E30-1 (VVL+) - E4-25 (VV1+) Always Below 1 Ω
      E30-2 (VVL-) - E4-33 (VV1-) Always Below 1 Ω
      E70-1 (VVR+) - E5-19 (VV2+) Always Below 1 Ω
      E70-2 (VVR-) - E5-29 (VV2-) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E30-1 (VVL+) or E4-25 (VV1+) - Body ground Always 10 kΩ or higher
      E30-2 (VVL-) or E4-33 (VV1-) - Body ground Always 10 kΩ or higher
      E70-1 (VVR+) or E5-19 (VV2+) - Body ground Always 10 kΩ or higher
      E70-2 (VVR-) or E5-29 (VV2-) - Body ground Always 10 kΩ or higher

    4. Reconnect the VVT sensor connector and ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK SENSOR INSTALLATION (VVT SENSOR FOR INTAKE SIDE)


    1. A0160ZHE17

      Check the VVT sensor installation.

      OK
      Sensor is installed correctly.

    NG

    REPAIR OR REPLACE VVT SENSOR Click here

    OK

  5. CHECK INTAKE CAMSHAFT


    1. Check the teeth of the signal plate.

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

    NG

    REPLACE INTAKE CAMSHAFT Click here

    OK

  6. REPLACE VVT SENSOR FOR INTAKE SIDE


    1. Replace the VVT sensor for intake side Click here.


    NEXT

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs Click here.

    5. Start the engine.

    6. Enter the following menus: Powertrain / Engine / DTC.

    7. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P0340, P0342, P0343, P0345, P0347 and/or P0348 are output B

      Tech Tips

      If the engine does not start, replace the ECM.


    B

    REPLACE ECM Click here

    A

    END

  8. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)


    1. Disconnect the VVT 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
      E30-3 (VC) - E3-18 (VC) Always Below 1 Ω
      E70-3 (VC) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E30-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher
      E70-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher

    4. Reconnect the VVT sensor connector and ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here