SFI SYSTEM (w/ Electronic Throttle Control System), Diagnostic DTC:P0341, P0342, P0343

DTC Code DTC Name
P0341 Camshaft Position Sensor "A" Circuit Range / Performance (Bank 1 or Single Sensor)
P0342 Camshaft Position Sensor Circuit Low Input
P0343 Camshaft Position Sensor Circuit High Input

DESCRIPTION

The camshaft position sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed on the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes through the camshaft position sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft turns twice the voltage is generated 3 times in the camshaft position sensor. The generated voltage in the sensor acts as a signal, allowing the ECM to locate the camshaft position. This signal is then used to control ignition timing, fuel injection timing, and the VVT system.

DTC No. DTC Detection Condition Trouble Area
P0341 Abnormal pulse of camshaft position sensor occurs 12 times or more totally in 1 driving cycle (3 trip detection logic)

  • Open or short in camshaft position sensor circuit

  • Camshaft position sensor

  • Intake camshaft

  • ECM
P0342 Camshaft position sensor output stays low (3 trip detection logic)

  • Short in camshaft position sensor circuit

  • Camshaft position sensor

  • Intake camshaft

  • ECM
P0343 Camshaft position sensor output stays high (3 trip detection logic)

  • Open in camshaft position sensor circuit

  • Short in power source circuit

  • Camshaft position sensor

  • Intake camshaft

  • ECM

The correct waveform is as shown below.

G1 stands for the camshaft position sensor signal, and NE+ stands for the crankshaft position sensor signal.

Item Content
Terminal

CH1: G1 - E1

CH2: NE+ - NE-
Equipment Setting 5 v/Division, 20 ms/Division
Condition While cranking or idling
A01375DE12

Tech Tips

These DTCs are detected when the engine is running or the engine cranks 12 revolutions or more.

WIRING DIAGRAM

A0138M9E02

INSPECTION PROCEDURE

Note

After replacing the ECM, perform electronic throttle learning Click here.

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.

PROCEDURE


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


    1. A0137Y7E01

      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
      B19-1 (G-) - B25-60 (G-) Always Below 1 Ω
      B19-2 (G1) - B25-59 (G1) Always Below 1 Ω
      B19-3 (VG) - B25-80 (VCG1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B19-2 (G1) or B25-59 (G1) - Body ground Always 10 kΩ or higher
      B19-3 (VG) or B25-80 (VCG1) - Body ground Always 10 kΩ or higher

    4. Reconnect the camshaft position sensor connector.

    5. Reconnect the ECM connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT CAMSHAFT POSITION SENSOR (SENSOR INSTALLATION)


    1. Check the sensor installation.

      OK
      The sensor is installed correctly.

    NG

    REPAIR OR REPLACE CAMSHAFT POSITION SENSOR

    OK

  3. INSPECT CAMSHAFT


    1. Check the teeth of the camshaft.

      OK
      The teeth do not have any cracks or deformation.

    NG

    REPLACE CAMSHAFT Click here

    OK

  4. REPLACE CAMSHAFT POSITION SENSOR


    1. Replace the camshaft position sensor Click here.


    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS


    1. Start the engine.

    2. Stop the engine and wait for at least 10 seconds.

    3. Connect the intelligent tester to the DLC3.

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

      Result
      Result Proceed to
      No output A
      P0341, P0342 or P0343 B

    B

    REPLACE ECM Click here

    A

    END