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P0340





2AZ-FE ENGINE CONTROL: SFI SYSTEM: 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.





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 P0335.

MONITOR DESCRIPTION

If no signal is transmitted by the camshaft position sensor despite the engine rotating, or the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





Case 1





Case 2





TYPICAL MALFUNCTION THRESHOLDS

Case 1





Case 2





CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.

2. Turn the ignition switch to ON and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

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 the pending DTCs.

HINT
* If a pending DTC is output, the system is malfunctioning.
* 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.





HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.
* If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.

13. If no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0335 P0335.

INSPECTION PROCEDURE

HINT
* If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.
* 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.

PROCEDURE

1. INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE)

(a) Inspect the camshaft position sensor Testing and Inspection.

NG -- REPLACE CAMSHAFT POSITION SENSOR Components
OK -- Continue to next step.

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

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(d) Reconnect the ECM connector.

(e) Reconnect the camshaft position sensor connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
OK -- Continue to next step.

3. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)





(a) Check the camshaft position sensor installation.

OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL SENSOR Installation
OK -- Continue to next step.

4. CHECK VALVE TIMING P0011

NG -- ADJUST VALVE TIMING Installation
OK -- Continue to next step.

5. INSPECT INTAKE CAMSHAFT (TIMING ROTOR)

(a) Check the timing rotor of the intake camshaft.

OK:

Camshaft timing rotor does not have any cracks or deformation.

NG -- REPLACE INTAKE CAMSHAFT Components
OK -- Continue to next step.

6. REPLACE CAMSHAFT POSITION SENSOR

(a) Replace the camshaft position sensor Components.

NEXT -- Continue to next step.

7. CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.

(e) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

(g) Read DTCs.

Result:





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

B -- REPLACE ECM Components

A -- END
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