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


DESCRIPTION

The camshaft position sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed onto 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
P0340
Case 1
  1. No camshaft position sensor signal to ECM while cranking (2 trip detection logic)
Case 2
  1. Camshaft/Crankshaft misalignment detected at engine speed of 600 rpm or more (1 trip detection logic)
  1. Open or short in camshaft position sensor circuit
  2. Camshaft position sensor
  3. Camshaft
  4. Valve timing (jumped tooth of timing chain)
  5. ECM

HINT:
DTC P0340 indicates a malfunction relating to the camshaft position sensor (+) circuit (the wire harness between the ECM and camshaft position sensor, and the camshaft position sensor itself).
Reference: Inspection using an oscilloscope
A063955E44

HINT:
  1. The correct waveform is as shown in the illustration.
  2. VV1+ stands for the camshaft position sensor signal, and NE+ stands for the crankshaft position sensor signal.
  3. Grounding failure of the shielded wire may cause noise in waveforms.
ECM Terminal Name
CH1: Between VV1+ and NE-
CH2: Between NE+ and NE-
Tester Range
5 V/DIV., 20 ms./DIV.
Condition
Idling

MONITOR DESCRIPTION

If no signal is transmitted by the camshaft position sensor despite the engine revolving, or the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.
If the malfunction is not repaired successfully, a DTC is stored 10 seconds after the engine is next started.

MONITOR STRATEGY


Related DTCs
P0340: Camshaft position sensor verify pulse input
Required Sensors/Components (Main)
Camshaft position sensor
Required Sensors/Components (Related)
Crankshaft position sensor
Frequency of Operation
Continuous
Duration
4 seconds: Camshaft position sensor verify pulse input case 1
5 seconds: Camshaft position sensor verify pulse input case 2
MIL Operation
2 driving cycles: Camshaft position sensor verify pulse input case 1
Immediate: Camshaft position sensor verify pulse input case 2
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


All: 
Monitor runs whenever following DTCs not present
None

Camshaft Position Sensor Verify Pulse Input Case 1: 
Starter
ON
Minimal battery voltage while starter ON
Less than 11 V

Camshaft Position Sensor Verify Pulse Input Case 2: 
Engine speed
600 rpm or more
Starter
OFF
VVT system misalignment
Not detected

TYPICAL MALFUNCTION THRESHOLDS


Camshaft Position Sensor Verify Pulse Input Case 1: 
Camshaft position sensor signal
No signal

Camshaft Position Sensor Verify Pulse Input Case 2: 
Eniter of the following is met
1 or 2
1. Camshaft position and crankshaft position phase
Misaligned
2. Camshaft position sensor signal
No signal

COMPONENT OPERATING RANGE


Camshaft position sensor
  1. Camshaft position sensor output voltage fluctuates while camshaft revolving
  2. 3 Camshaft position sensor signals per 2 crankshaft revolutions

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine.
  7. Idle the engine for 10 seconds or more [A].
  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
  9. Read pending DTCs.

    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. If a pending DTC is not output, perform the following procedure.
  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  11. Input the DTC: P0340.
  12. Check the DTC judgment result.

    Techstream Display
    Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. If the judgment result shows INCOMPLETE or N/A, perform steps [A] through [B] again.
  13. If no pending DTC is output, perform a universal trip and check for permanent DTCs (Click here).

    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0335 (Click here).

INSPECTION PROCEDURE

HINT:
  1. Read freeze frame data using the Techstream. 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.
  2. If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.
1.INSPECT CAMSHAFT POSITION SENSOR
  1. Inspect the camshaft position sensor (Click here).



NG
REPLACE CAMSHAFT POSITION SENSOR (Click here)
OK


2.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
  1. Disconnect the camshaft position sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    Condition
    Specified Condition
    C54-1 - C51-82 (VV1+)
    Always
    Below 1 Ω
    C54-2 - C51-110 (NE-)
    Always
    Below 1 Ω
    C54-1 or C51-82 (VV1+) - Body ground
    Always
    10 kΩ or higher
    C54-2 or C51-110 (NE-) - Body ground
    Always
    10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)
BR03795E39
  1. Check the camshaft position sensor installation.

    OK:
    Sensor is installed correctly.


NG
SECURELY REINSTALL SENSOR (Click here)
OK


4.CHECK VALVE TIMING


    A175434E03
  1. Remove the cylinder head cover.

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

  1. Check that the timing marks on the camshaft timing sprocket and camshaft timing gear are facing upward as shown in the illustration.

    1. If not, turn the crankshaft 1 revolution (360°), then align the marks as above.

    OK:
    Timing marks on camshaft timing gears are aligned as shown in the illustration.
    Text in Illustration 
    *a
    Timing Marks (at top center of each gear)
    *b
    Timing Mark (groove on crankshaft pulley)


NG
ADJUST VALVE TIMING (Click here)
OK


5.CHECK CAMSHAFT (TIMING ROTOR)
  1. Check the timing rotor of the camshaft.

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


NG
REPLACE CAMSHAFT (Click here)
OK


6.REPLACE CAMSHAFT POSITION SENSOR
  1. Replace the camshaft position sensor (Click here).


NEXT


7.CHECK WHETHER DTC OUTPUT RECURS (DTC P0340)
  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Clear the DTCs (Click here).

  1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

  1. Read DTCs.

    Result 
    Result
    Proceed to
    DTC is not output
    (No pending DTCs output)
    A
    DTC P0340 is output
    B

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


B
REPLACE ECM (Click here)
A

END