P0347

1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340, P0342, P0343, P0345, P0347, P0348: Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)


DESCRIPTION

The intake camshaft's Variable Valve Timing (VVT) sensor (VV1, 2 signal) consists of a magnet and MRE (Magnetic Resistance Element).

The camshaft timing gear assembly has a sensor plate with 3 teeth on its outer circumference. When the gear rotates, changes occur in the air gaps between the sensor plate and MRE, which affect the magnetic field. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the gear rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM.

The crankshaft angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine revolution. Based on the 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.





VV1, VV2 and NE signal waveforms





- Inspection using an oscilloscope.

HINT
* The correct waveform is shown above.
* VV1+ and VV2+ stand for the VVT sensor (for intake side) signal, and NE+ stands for the crankshaft position sensor signal.






MONITOR DESCRIPTION

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

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





P0340 VVT Sensor Verify Pulse Input





P0340 Camshaft Position/Crankshaft Position Misalignment





P0342, P0343 VVT Sensor Range Check (Low Voltage, High Voltage)





P0347, P0348 VVT Sensor Range Check (Low Voltage, High Voltage)





P0345 VVT Sensor Verify Pulse Input





TYPICAL MALFUNCTION THRESHOLDS

P0340, P0345 VVT Sensor Verify Pulse Input





P0340 Camshaft Position/Crankshaft Position Misalignment





P0342, P0347 VVT Sensor Range Check (Low Voltage)





P0343, P0348 VVT Sensor Range Check (High Voltage)





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 and ECT / Trouble Codes [B].

9. Read the DTCs.

HINT
* If a DTC is output, the system is malfunctioning.
* If a 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, P0343, P0345, P0347 or P0348.

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 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. Freeze frame data record the engine condition 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. INSPECT ECM TERMINAL VOLTAGE





(a) Inspect the ECM using an oscilloscope.

(1) While the engine is idling, check the waveform between the terminals of the ECM connector.

OK:





Text in Illustration





NG -- CHECK VVT SENSOR (FOR INTAKE SIDE) (SENSOR POWER SOURCE)

OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems

2. CHECK VVT SENSOR (FOR INTAKE SIDE) (SENSOR POWER SOURCE)





(a) Disconnect the VVT sensor (for intake side) 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 (VVT SENSOR (FOR INTAKE SIDE) - ECM)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (VVT SENSOR (FOR INTAKE SIDE) - ECM)

(a) Disconnect the VVT 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 (Check for Open):





Standard Resistance (Check for Short):





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

4. CHECK SENSOR INSTALLATION (VVT SENSOR (FOR INTAKE SIDE))

(a) Check the VVT sensor (for intake side) installation.

OK:

VVT sensor (for intake side) is installed correctly.





NG -- SECURELY REINSTALL VVT SENSOR (FOR INTAKE SIDE) Installation
OK -- Continue to next step.

5. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF SENSOR PLATE)

(a) Check the teeth of the sensor plate.

OK:

Sensor plate teeth do not have any cracks or deformation.

NG -- REPLACE CAMSHAFT TIMING GEAR ASSEMBLY Removal
OK -- Continue to next step.

6. REPLACE VVT SENSOR (FOR INTAKE SIDE)

(a) Replace the VVT sensor (for intake side) Removal.

NEXT -- Continue to next step.

7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342, P0343, P0345, P0347 OR P0348)

(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) Refer to the confirmation driving pattern.

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

(g) Read the DTCs.

Result





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

B -- END
A -- Continue to next step.

8. CHECK VALVE TIMING

(a) Check the valve timing P0011.

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

9. CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342, P0343, P0345, P0347 OR P0348)

(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) Refer to the confirmation driving pattern.

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

(g) Read the DTCs.

Result





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

B -- REPLACE ECM Removal

A -- END

10. CHECK HARNESS AND CONNECTOR (VVT SENSOR (FOR INTAKE SIDE) - ECM)

(a) Disconnect the VVT 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 (Check for Open):





Standard Resistance (Check for Short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal