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 (MRE) 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 MRE 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

When one of following conditions is met:


  • Input voltage to ECM remains 0.3 V or less, or 4.7 V or higher for more than 4 seconds, when 2 more seconds have elapsed after turning power switch on (IG)

    (1 trip detection logic)

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

    (2 trip detection logic)

  • No VVT sensor (for intake side of bank 1, 2) signal to ECM during cranking

    (1 trip detection logic)

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

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

  • Intake camshaft (for Bank 1, 2)

  • ECM

P0342

P0347

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

(1 trip detection logic)

P0343

P0348

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

(1 trip detection logic)
A000VJOE02
*a VV1, VV2 and NE Signal Waveforms
*b 5 V/DIV.
*c 20 msec./DIV.

Tech Tips


  • The correct waveform is as shown.

  • VV1+ and VV2+ stand for the VVT sensor (for intake side) signal, and NE+ stands for the CKP 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 running, 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 5 seconds, the ECM sets a DTC.

WIRING DIAGRAM

A000YCZE05
*a VVT Sensor (for Intake Side of Bank 1)
*b VVT Sensor (for Intake Side of Bank 2)

CAUTION / NOTICE / HINT

Tech Tips


  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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.

  • When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.

PROCEDURE


  1. CHECK ECM TERMINAL VOLTAGE


    1. Inspect the ECM using an oscilloscope.

      A000WGOE02
      *a Component with harness connected: (ECM)
      *b 5 V/DIV.
      *c 20 msec./DIV.

      1. Turn the power switch on (READY).

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

        Standard voltage
        Tester Connection Condition Specified Condition
        E1-27 (NE+) - E1-34 (NE-) Engine idling Correct waveform appears as shown
        E2-25 (VV1+) - E2-33 (VV1-)
        E4-19 (VV2+) - E4-29 (VV2-)

    OK

    REPLACE ECM Click here

    NG

  2. INSPECT VVT SENSOR (SENSOR POWER SOURCE)

    A000Y14E01

    1. Disconnect the E31 or E39 VVT sensor (for Intake Side) connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      E39-3 (VC) - Body ground Power switch on (IG) 4.5 to 5.0 V
      E31-3 (VC) - Body ground Power switch on (IG) 4.5 to 5.0 V

    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)

    A000TQPE01

    1. Disconnect the E31 or E39 VVT sensor (for Intake Side) connector.

    2. Disconnect the E2 or E4 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
      E39-1 (VVL+) - E2-25 (VV1+) Always Below 1 Ω
      E39-2 (VVL-) - E2-33 (VV1-) Always Below 1 Ω
      E31-1 (VVR+) - E4-19 (VV2+) Always Below 1 Ω
      E31-2 (VVR-) - E4-29 (VV2-) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      E39-1 (VVL+) or E2-25 (VV1+) - Body ground Always 10 kΩ or higher
      E39-2 (VVL-) or E2-33 (VV1-) - Body ground Always 10 kΩ or higher
      E31-1 (VVR+) or E4-19 (VV2+) - Body ground Always 10 kΩ or higher
      E31-2 (VVR-) or E4-29 (VV2-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK SENSOR INSTALLATION

    A000XAHE01
    *1 Clearance

    1. Check the VVT sensor (for Intake Side of Bank 1 or of Bank 2) installation.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL SENSOR Click here

    OK

  5. CHECK INTAKE CAMSHAFT (for Bank 1 or Bank 2)


    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 of Bank 1 or Bank 2)


    1. Replace the VVT sensor (for Intake Side of Bank 1 or Bank 2) 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 power switch on (IG).

    3. Turn the tester ON.

    4. Clear DTCs Click here.

    5. Put the engine in inspection mode Click here.

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

    7. Read the DTCs.

      Result
      Display (DTC Output) Proceed to
      No output A
      P0340, P0342, P0343, P0345, P0347 and/or P0348 B

      Tech Tips

      If the engine does not start, replace the ECM.


    A

    END

    B

    REPLACE ECM Click here

  8. CHECK HARNESS AND CONNECTOR (VVT SENSOR (for Intake Side) - ECM)

    A000XD3E02

    1. Disconnect the E31 or E39 VVT sensor (for Intake Side) connector.

    2. Disconnect the E1 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
      E39-3 (VC) - E1-18 (VC) Always Below 1 Ω
      E31-3 (VC2) - E1-18 (VC) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      E39-3 (VC) or E1-18 (VC) - Body ground Always 10 kΩ or higher
      E31-3 (VC2) or E1-18 (VC) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR