2GR-FKS (ENGINE CONTROL): SFI SYSTEM: P034011,P034015,P034031,P034511,P034515,P034531; Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Ground; 2018 - 2020 MY Sienna [11/2017

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

The intake camshaft has a timing rotor 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 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, injection timing and the Variable Valve Timing (VVT) system.

Reference: Inspection using an oscilloscope.

HINT:

The correct waveform is as shown.
VV1 stands for the VVT sensor (for intake camshaft of bank 1) signal, and VV2 stands for the VVT sensor (for intake camshaft of bank 2) signal.

ECM Terminal Name

CH1: Between VV1+ and VV1-

CH2: Between VV2+ and VV2-

Tester Range

5 V/DIV., 20 ms./DIV.

Condition

Idling

MONITOR DESCRIPTION

If no pulse signal is transmitted by the VVT sensor (for intake camshaft) despite the camshaft rotating, or the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

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

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

P0340: VVT Sensor (Bank 1) Verify Pulse Input

P0342 and P0343: VVT Sensor (Bank 1) Range Check (Low Voltage, High Voltage)

P0345: VVT Sensor (Bank 2) Verify Pulse Input

P0347 and P0348: VVT Sensor (Bank 2) Range Check (Low Voltage, High Voltage)

TYPICAL MALFUNCTION THRESHOLDS

P0340 and P0345: VVT Sensor Verify Pulse Input

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

P0343 and P0348: VVT Sensor Range Check (High Voltage)

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the Techstream on.
Start the engine [A].
Idle the engine for 10 seconds or more [B].
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
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.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P034011, P034015, P034031, P034511, P034515 or P034531.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

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, perform steps [A] and [B] again.
[A] to [C]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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 transaxle.
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

(a) Remove the cylinder head cover sub-assembly and cylinder head cover sub-assembly LH.

(b) Turn the crankshaft pulley and align its groove with the TDC timing mark of the timing chain cover.

(c) Check that the timing marks of the camshaft timing gear assembly and camshaft timing exhaust gear assemblies are aligned with the timing marks of the bearing cap as shown in the illustration.

If the timing marks are not as shown, turn the crankshaft one revolution clockwise.

Timing marks on camshaft timing gear assemblies and camshaft timing exhaust gear assemblies are aligned as shown in the illustration.

If the result is not as specified, check for mechanical malfunctions that may have affected the valve timing, such as a jumped tooth or stretching of the timing chain.

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

(a) Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain.

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