SFI SYSTEM (w/o 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 Contents
Terminal

CH1: G1 - E1

CH2: NE+ - NE-
Equipment Setting 5 V/Division, 20 ms/Division
Condition While cranking or idling
A01375DE06

Tech Tips

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

WIRING DIAGRAM

A013656E01

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.

PROCEDURE


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


    1. A0137SBE01

      Disconnect the B19 camshaft position sensor connector.

    2. Disconnect the B26 ECM connector.

    3. Measure the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      Camshaft position sensor (B19-1) - G1 (B26-55) Below 1 Ω
      Camshaft position sensor (B19-2) - G- (B26-56) Below 1 Ω
      Camshaft position sensor (B19-3) - VCG1 (B26-30) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      Camshaft position sensor (B19-1) or G1 (B26-55) - Body ground 10 kΩ or higher
      Camshaft position sensor (B19-3) or VCG1 (B26-30) - Body ground 10 kΩ or higher

    4. Reconnect the camshaft position sensor connector.

    5. Reconnect the ECM connectors.


    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  2. INSPECT CAM POSITION SENSOR (SENSOR INSTALLATION)


    1. Check the sensor installation.

      OK
      The sensor is installed correctly.

    NG

    REPAIR OR REPLACE CAM 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

    OK

  4. REPLACE CAM POSITION SENSOR


    NEXT

  5. CHECK IF 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. Select the following menu items: Powertrain / Engine and ECT / DTC / Pending.

      Result
      Display (DTC Output) Proceed To
      No output A
      P0341, P0342 or P0343 B

    B

    REPLACE ECM

    A

    END