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P0340





2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340,P0342,P0343,P0345,P0347,P0348: Camshaft Position Sensor Circuit Malfunction


DESCRIPTION

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

The VVT camshaft drive gear 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 affects 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 combination of the VVT 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
- The correct waveform is as shown.
- VV1+ and VV2+ stand for the VVT sensor 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:

All::





P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 1)

P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 1):





P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 2)

P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 2):





P0342, P0343: VVT Sensor (Bank 1) Range Check

P0342, P0343: VVT Sensor (Bank 1) Range Check:





P0345: VVT Sensor (Bank 2) Verify Pulse Input

P0345: VVT Sensor (Bank 2) Verify Pulse Input:





P0347, P0348: VVT Sensor (Bank 1) Range Check

P0347, P0348: VVT Sensor (Bank 1) Range Check:





TYPICAL MALFUNCTION THRESHOLDS

P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 1)

P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 1):





P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 2)

P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 2):





P0342, P0347: VVT Sensor (Bank1, 2) Range Check (Low Voltage)

P0342, P0347: VVT Sensor (Bank1, 2) Range Check (Low Voltage):





P0343, P0348: VVT Sensor (Bank1, 2) Range Check (High voltage)

P0343, P0348: VVT Sensor (Bank1, 2) Range Check (High voltage):





P0345: VVT Sensor (Bank 2) Verify Pulse Input

P0345: VVT Sensor (Bank 2) Verify Pulse Input:





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

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

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

- Turn the engine switch off and wait for 30 seconds.

- Turn the engine switch on (IG) and turn the Techstream on [A].

- Start the engine.

- Idle the engine for 10 seconds or more [B].

- Enter the following menus: Powertrain / Engine / Trouble Codes.

- Read the DTC [C].

- If a DTC is output, the system is malfunctioning.

HINT
If a DTC is not output, perform the following procedure.

- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Input the DTC: P0340, P0342, P0343, P0345, P0347 or P0348.

- 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 UNKNOWN, perform step [B] again.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Check the 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 test result is INCOMPLETE or UNKNOWN and no 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

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 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 HARNESS AND CONNECTOR (SENSOR POWER SOURCE)

(a) Disconnect the B44 or B46 VVT sensor connector.





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

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

Standard voltage:





(d) Reconnect the VVT sensor connector.

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

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

(a) Disconnect the B44 or B46 VVT sensor connector.

(b) Disconnect the B12 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.

3. CHECK SENSOR INSTALLATION (VVT SENSOR)

(a) Check the VVT sensor installation condition.





OK:

Sensor is installed correctly.

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

4. CHECK 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
OK -- Continue to next step.

5. REPLACE VVT SENSOR

NEXT -- Continue to next step.

6. CHECK WHETHER DTC OUTPUT RECURS

(a) Connect Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Clear the DTCs DTC Check / Clear.

(e) Turn the engine switch off.

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

(g) Start the engine.

(h) Idle the engine for 10 seconds or more.

(i) Select the following menu items: Powertrain / Engine / Trouble Codes / Pending.

(j) Read the pending DTCs.

Result:





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

B -- REPLACE ECM Removal

A -- END

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

(a) Disconnect the VVT 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 VVT sensor connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal
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