P0340

2AR-FE ENGINE CONTROL: SFI SYSTEM: P0340, P0342, P0343: Camshaft Position Sensor Circuit Malfunction
P0343 - Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)

DESCRIPTION

The intake camshaft position sensor (G2 signal) consists of a magnet and MRE (Magneto-resistive Element).

The intake camshaft has 3 teeth on its outer circumference. When the intake camshaft rotates, changes occur in the air gaps between the 3 teeth and MRE, which affects the magnetic field. As a result, the resistance of the MRE fluctuates. The camshaft position sensor converts the camshaft rotation data into pulse signals, uses the pulse signals to determine the camshaft angle, and sends the data to the ECM.

The crankshaft position sensor plate has 34 teeth. The MRE generates 34 signals for each crankshaft revolution. Based on a combination of the G2 signal and NE signal, the ECM detects the crankshaft angle. Then the ECM uses this data to control fuel injection time and injection timing. Also, based on the NE signal, the ECM detects the engine speed.





- Reference: Inspection using an oscilloscope.





HINT
- G2 stands for the camshaft position sensor signal, NE stands for the crankshaft position sensor signal and EV1 stands for the camshaft position sensor (for exhaust side) signal.
- Grounding failure of the shielded wire may cause noise in waveforms.





MONITOR DESCRIPTION

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

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

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P0340 VVT Sensor Range Check (Cranking)





P0340 Camshaft Position/Crankshaft Position Misalignment





P0342, P0343 VVT Sensor Range Check





TYPICAL MALFUNCTION THRESHOLDS

P0340 VVT Sensor Range Check (Cranking)





P0340 Camshaft Position/Crankshaft Position Misalignment





P0342 VVT Sensor Range Check





P0343 VVT 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 the 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 / 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 / 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 UNKNOWN, perform steps [A] and [B] again.

13. If no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

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

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when malfunctions are detected. 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 (SENSOR POWER SOURCE)





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

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

Standard Voltage:





Text in Illustration





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

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

(a) Disconnect the camshaft position sensor for intake side 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 SIDE)

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





OK:

Sensor is installed correctly.

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

4. INSPECT NO. 1 CAMSHAFT (TEETH)

(a) Check the teeth of the No. 1 camshaft.

OK:

Teeth do not have any cracks or deformation.

NG -- REPLACE NO. 1 CAMSHAFT Removal
OK -- Continue to next step.

5. REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE SIDE)

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

NEXT -- Continue to next step.

6. 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 the DTCs.

(e) Start the engine and idle it for 10 seconds or more.

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

(g) Read the DTCs.

Result





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

B -- REPLACE ECM Removal

A -- END