ECD SYSTEM, Diagnostic DTC:P0340

DTC Code DTC Name
P0340 Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)

DESCRIPTION

The camshaft position sensor (G signal) consists of a magnet and MRE element.

The camshaft drive gear has 5 teeth on its inner circumference. When the camshaft gear rotates, air gap changes between the protrusion on the gear and the pickup coil. The change affects the magnetic field and results in change in the resistance of the MRE element. The crankshaft angle sensor plate has 32 teeth and output 32 signals every engine revolution. The ECM detects the standard crankshaft angle based on the G signal and actual crankshaft angle and engine speed by NE signal.

DTC No. DTC Detection Condition Trouble Area
P0340

STA ON:

No camshaft position sensor signal to ECM while cranking for 4 seconds or more

STA OFF:

No camshaft position sensor signal to ECM with engine speed 650 to 3000 rpm 20 times or more

  • Open or short in camshaft position sensor circuit

  • Camshaft position sensor

  • Camshaft drive gear

  • ECM

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.

PROCEDURE


  1. CHECK CAMSHAFT POSITION SENSOR


    1. A01CI68E01

      While idling the engine, check the waveform of the ECM connectors using an oscilloscope.

      Standard
      Tester Connection Specified Condition
      E22-27 (NE+) - E22-34 (NE-) Correct waveform appears as shown
      E23-23 (G+) - E23-31 (G-) Correct waveform appears as shown

    OK

    CHECK DTC OUTPUT Click here

    NG

  2. CHECK ECM (VCG VOLTAGE)


    1. A01CGXCE04

      Turn the ignition switch to the ON position.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      E23-22 (VCG) - E23-31 (G-) Ignition switch in the ON position 4.5 to 5.5 V

    NG

    REPLACE ECM

    OK

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


    1. A01CI35E01

      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
      C1-1 (OUT) - E23-23 (G+) Always Below 1 Ω
      C1-2 (GND) - E23-31 (G-) Always Below 1 Ω
      C1-3 (VCC) - E23-22 (VCG) Always Below 1 Ω
      Check for short
      Tester Connection Condition Specified Condition
      C1-1 (OUT) or E23-23 (G+) - Body ground Always 10 kΩ or higher
      C1-2 (GND) or E23-31 (G-) - Body ground Always 10 kΩ or higher
      C1-3 (VCC) or E23-22 (VCG) - 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 CAMSHAFT POSITION SENSOR (SENSOR INSTALLATION)

    A01CIX2E40
    OK
    The camshaft position sensor is installed properly.

    NG

    SECURELY REINSTALL CAMSHAFT POSITION SENSOR

    OK

  5. INSPECT CAMSHAFT TIMING GEAR


    1. Check the teeth of the camshaft timing gear.


    NG

    REPLACE CAMSHAFT TIMING GEAR

    OK

  6. REPLACE CAMSHAFT POSITION SENSOR


    1. Replace the camshaft position sensor Click here.


    NEXT

  7. CHECK DTC OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position.

    3. Turn the tester on.

    4. Enter the following menu items: Powertrain / Engine and ECT / DTC.

    5. Read the value.

      Result
      Display (DTC output) Proceed to
      P0340 is output A
      No DTC is output B

    B

    SYSTEM IS OK

    A

    REPLACE ECM