P0343

1NR-FE ENGINE CONTROL: SFI SYSTEM: P0340, P0342, P0343: Camshaft Position Sensor Circuit Malfunction

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)

DESCRIPTION

The camshaft position sensor for the intake camshaft (G signal sensor) consists of a magnet and MRE (Magneto-resistive Element).

The camshaft has a timing rotor for the camshaft position sensor. When the camshaft rotates, changes occur in the air gaps between the timing rotor and MRE, which affects the magnetic field. As a result, the resistance of the MRE material fluctuates. The camshaft position sensor converts the camshaft rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM. Then the ECM uses this data to control fuel injection time and injection timing.





- Reference: Inspection using an oscilloscope.





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





MONITOR DESCRIPTION

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

Also, when the sensor output voltage remains at below 0.3 V, or higher than 4.7 V for more than 4 seconds, the ECM stores a DTC.

If the malfunction is not repaired successfully, the DTC is stored 10 seconds after the engine is next started.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P0340: Camshaft Position Sensor Verify Pulse Input





P0340: Camshaft Position Sensor Range Check/Rationality





P0342, P0343: Camshaft Position Sensor Range Check





TYPICAL MALFUNCTION THRESHOLDS

P0340: Camshaft Position Sensor Verify Pulse Input





P0340: Camshaft Position Sensor Range Check/Rationality





P0342: Camshaft Position Sensor Range Check





P0343: Camshaft Position Sensor Range Check





COMPONENT OPERATING RANGE





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 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 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, P0342 or P0343.

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

PROCEDURE

1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF CAMSHAFT POSITION SENSOR)

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





(b) Turn the ignition switch to ON.

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

Standard Voltage:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
OK -- Continue to next step.

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

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

(b) Disconnect the ECM connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

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





OK:

Sensor is installed correctly.

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

4. 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 Removal
OK -- Continue to next step.

5. CHECK VALVE TIMING

(a) Check the valve timing P0011.

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

6. REPLACE CAMSHAFT POSITION SENSOR FOR INTAKE CAMSHAFT

(a) Replace the camshaft position sensor for intake camshaft Removal.

NEXT -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) Turn the ignition switch off.

(f) Start the engine.

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

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

(i) Read DTCs.

Result





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

B -- END

A -- REPLACE ECM Removal

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

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

(b) Disconnect the ECM connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal