P0343

4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340, P0342, P0343, P0345, P0347, P0348: Camshaft Position Sensor Circuit Malfunction

DESCRIPTION

The VVT sensor (for intake camshaft) (VV1, VV2 signal) consists of a magnet and MRE (Magneto Resistance Element).

The camshaft timing gear assembly has a sensor plate for the VVT sensor. When the intake 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 VVT sensor converts the intake 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 duration, fuel injection timing and Variable Valve Timing (VVT) system.

- Reference: Inspection using an oscilloscope

HINT
- The correct waveform is as shown.
- VV1+ and VV2+ stand for the VVT sensor for intake camshaft signal, and NE+ stands for the CKP 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 (Case 1)

P0340 (Case 2)

P0342 and P0343

P0345

P0347 and P0348

TYPICAL MALFUNCTION THRESHOLDS

P0340 (Case 1) and P0345

P0340 (Case 2)

P0342 and P0347

P0343 and P0348

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.

2. Turn the engine switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.

4. Turn the engine switch off and wait for at least 30 seconds.

5. Turn the engine switch on (IG) 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.

9. Read the pending DTC [B].

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, P0343, P0345, P0347 or P0348.

12. Check the DTC judgment result.

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows INCOMPLETE or N/A, 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
- Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
- Bank 2 refers to the bank that does not include the No. 1 cylinder.
- Read freeze frame data using 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.

PROCEDURE

1. CHECK 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.

Standard:

OK -- REPLACE ECM Removal
NG -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE)

(a) Disconnect the E19 or E30 VVT sensor connector.

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

Standard voltage:

(c) Reconnect the VVT sensor connector.

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

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

(a) Disconnect the E19 or E30 VVT sensor connector.

(b) Disconnect the E3 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 VVT sensor connector.

(e) Reconnect the ECM connector.

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

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

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

OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL VVT SENSOR FOR INTAKE CAMSHAFT Installation
OK -- Continue to next step.

5. CHECK CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF PLATE)

(a) Check the teeth of the signal 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. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH) P0011

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

7. REPLACE VVT SENSOR (FOR INTAKE CAMSHAFT)

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

NEXT -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

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

(e) Turn the engine switch off and wait for at least 30 seconds.

(f) Start the engine.

(g) Turn the Techstream on.

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

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

(j) Read the pending DTCs.

Result:

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

B -- END

A -- REPLACE ECM Removal