P0340

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 VVT sensor (VV1, VV2 signal) consists of a magnet and MRE (Magnetic Resistance Element).

The VVT 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 VVT sensor 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.

- Inspection using an oscilloscope

HINT
* The correct waveform is shown above.
* VV1 and VV2 stand for the VVT sensor signal, and NE stands for the crank angle sensor plate does not have any cracks or deformation. 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.

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.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

All

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

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

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

P0345: VVT Sensor (Bank 2) Verify Pulse Input

P0347 and P0348: VVT Sensor (Bank 2) Range Check

TYPICAL MALFUNCTION THRESHOLDS

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

P0340 and P0345: VVT Sensor (Bank 1, 2) Verify Pulse Input (Case 2)

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

P0343 and P0348: VVT Sensor (Bank1, 2) 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 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 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, 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 N/A, perform steps [A] and [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
* If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.
* 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 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.

PROCEDURE

1. CHECK VVT SENSOR (SENSOR POWER SOURCE)

(a) Disconnect the VVT sensor connector.

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

Standard Voltage:

Text in Illustration

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

2. CHECK HARNESS AND CONNECTOR (VVT SENSOR - 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:

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

3. CHECK SENSOR INSTALLATION (VVT SENSOR)

(a) Check the VVT sensor installation.

OK:

VVT sensor is installed correctly.

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

4. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (TEETH PLATE)

(a) Inspect 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. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN) P0011

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

6. REPLACE VVT SENSOR

(a) Replace the VVT sensor Removal.

NEXT -- Continue to next step.

7. CHECK WHETHER DTC OUTPUT RECURS (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 DTCs Reading and Clearing Diagnostic Trouble Codes.

(e) Start the engine.

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

(g) Read DTCs.

Result

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

B -- REPLACE ECM Removal

A -- END

8. CHECK HARNESS AND CONNECTOR (VVT SENSOR - 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:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal