DTC    P0340    Camshaft Position Sensor Circuit Malfunction

DTC    P0342    Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)

DTC    P0343    Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)

for Preparation Click here


DESCRIPTION

The Camshaft Position (CMP) sensor for the intake camshaft (G signal sensor) consists of a magnet and an MRE element.
The camshaft has a timing rotor for the CMP sensor. When the camshaft rotates, changes occur in the air gaps between the timing rotor and MRE element, which affect the magnetic field. As a result, the resistance of the MRE material fluctuates. The CMP sensor converts the camshaft rotation data to pulse signals, and uses the pulse signals to determine the camshaft angle, which it sends to the ECM. Then the ECM uses this data to control ignition and fuel injection timing.

DTC No.
DTC Detection Condition
Trouble Area
P0340
No camshaft position sensor signal to ECM while cranking
(2 trip detection logic)
  1. Open or short in camshaft position sensor circuit for intake camshaft
  2. Camshaft position sensor for intake camshaft
  3. Camshaft timing gear for intake camshaft
  4. Jumped tooth of timing chain for intake camshaft
  5. ECM
Missing camshaft position sensor signal despite crankshaft position sensor inputs normal at engine speed of 600 rpm or more*
(1 trip detection logic)
P0342
Output voltage of camshaft position sensor less than 0.3 V for 4 seconds
(1 trip detection logic)
  1. Open or short in camshaft position sensor circuit for intake camshaft
  2. Camshaft position sensor for intake camshaft
  3. ECM
P0343
Output voltage of camshaft position sensor 4.7 V or more for 4 seconds
(1 trip detection logic)
  1. Open or short in camshaft position sensor circuit for intake camshaft
  2. Camshaft position sensor for intake camshaft
  3. ECM
*: for Manual Transaxle
When the engine is stopped due to Stop and Start system control, the camshaft position sensor does not monitor, but will resume monitoring when the engine is running.

  1. A200773E01
    Reference: Inspection using an oscilloscope.

    HINT:
    1. The correct waveform is as shown.
    2. G2 stands for the camshaft position sensor signal (for intake camshaft), and EV1 stands for the camshaft position sensor signal (for exhaust camshaft).
    3. Grounding failure of the shielded wire may cause a noisy waveform.

    Item
    		Content
    Terminals
    		CH1: G2+ - G2-
    CH2: EV1+ - EV1-
    Equipment Settings
    		5 V/DIV.
    20 ms./DIV.
    Conditions
    		Idling with warm engine

WIRING DIAGRAM

Refer to DTC P0335 (Click here).

INSPECTION PROCEDURE

HINT:
  1. If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
  2. 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.

1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0340, P0342 OR P0343)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read DTCs.
    Result 
    Result
    		Proceed to
    DTC P0340, P0342 or P0343 is output
    		A
    DTC P0340, P0342 or P0343 and other DTCs are output
    		B

    HINT:
    If any DTCs other than P0340, P0342 or P0343 are output, troubleshoot those DTCs first.



B
GO TO DTC CHART (Click here)
A


2.INSPECT CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) (SENSOR POWER SOURCE)


    A209301E05

  1. Disconnect the camshaft position sensor (for intake camshaft) connector.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    B55-3 (VC) - Body ground
    		Ignition switch ON
    		4.5 to 5.5 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Camshaft Position Sensor for Intake Camshaft)

  1. Reconnect the camshaft position sensor (for intake camshaft) connector.



NG
Go to step 10
OK


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

  1. Disconnect the camshaft position sensor (for intake camshaft) connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    B55-1 (VVI+) - B8-94 (G2+)
    		Always
    		Below 1 Ω
    B55-2 (VVI-) - B8-118 (G2-)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    B55-1 (VVI+) or B8-94 (G2+) - Body ground
    		Always
    		10 kΩ or higher
    B55-2 (VVI-) or B8-118 (G2-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the camshaft position sensor (for intake camshaft) connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR FOR INTAKE CAMSHAFT)


    BR03795E17

  1. Check the camshaft position sensor (for intake camshaft) installation.

    OK:
    Sensor is installed correctly.



NG
SECURELY REINSTALL CAMSHAFT POSITION SENSOR FOR INTAKE CAMSHAFT
OK


5.INSPECT CAMSHAFT (TIMING ROTOR)

  1. Check the timing rotor of the intake camshaft.

    OK:
    Camshaft timing rotor does not have any cracks or deformation.



NG
REPLACE CAMSHAFT (Click here)
OK


6.REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

  1. Replace the camshaft position sensor for intake camshaft (Click here).


NEXT


7.CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342 OR P0343)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (Click here).

  1. Switch the ECM from normal mode to check mode (Click here).

  1. Start the engine and allow the engine to idle for 10 seconds or more.

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

  1. Read DTCs.
    Result 
    Result
    		Proceed to
    DTC P0340, P0342 or P0343 is output
    		A
    DTC is not output
    		B

    HINT:
    If the engine does not start, replace the ECM.



B
END
A


8.CHECK VALVE TIMING
A187739E01

  1. Remove the cylinder head cover (Click here).

  1. Turn the crankshaft pulley, and align its groove with the alignment mark "0" of the timing chain cover.

  1. Check that the timing mark of the camshaft timing sprocket is in the position shown in the illustration.

    HINT:
    If not, turn the crankshaft damper 1 revolution (360°) to align the timing mark and sprocket as above.

    OK:
    Alignment marks on camshaft timing gears are aligned as shown in the illustration

Text in Illustration 
*1
Reference Camshaft Layout
*2
Timing Mark Plate
*3
Timing Mark
*4
No. 1 Cylinder at TDC Compression

  1. Reinstall the cylinder head cover (Click here).



NG
ADJUST VALVE TIMING
OK


9.CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342 OR P0343)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (Click here).

  1. Switch the ECM from normal mode to check mode (Click here).

  1. Start the engine and allow the engine to idle for 10 seconds or more.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble codes.

  1. Read DTCs.
    Result 
    Result
    		Proceed to
    DTC is not output
    		A
    DTC P0340, P0342 or P0343 is output
    		B

    HINT:
    If the engine does not start, replace the ECM.



B
REPLACE ECM (Click here)
A

END 

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

  1. Disconnect the camshaft position sensor (for intake camshaft) connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    B55-3 (VC) - B8-119 (VCV1)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    B55-3 (VC) or B8-119 (VCV1) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the camshaft position sensor (for intake camshaft) connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)