M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P034011; Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Ground; 2020 - 2023 MY Corolla Corolla Hatchback [03/2019

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

The intake camshaft has a timing rotor for the camshaft position 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 camshaft position sensor converts the camshaft rotation data to pulse signals, uses the pulse signals. The ECM uses the pulse signals to determine the camshaft angle. Then the ECM uses this data to control fuel injection duration and injection timing.

Reference: Inspection using an oscilloscope.

HINT:

The correct waveform is as shown.
VV1 stands for the camshaft position sensor signal (for intake camshaft), and EV1 stands for the camshaft position sensor signal (for exhaust camshaft).

ECM Terminal Name

CH1: Between VV1+ and VV1-

CH2: Between EV1+ and EV1-

Tester Range

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

Condition

Idling with warm engine

MONITOR DESCRIPTION

2 seconds or more after the ignition switch has been turned ON, if the output voltage of the camshaft position sensor (for intake camshaft) is less than 0.3 V for 4 seconds or more, the ECM determines that the camshaft position sensor (for intake camshaft) circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

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.
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When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
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Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
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 [A].
Turn the Techstream on.
Wait for 5 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.
Proceed to the next screen and enter the DTC to be checked.

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 is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.
[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

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

Powertrain > Engine > Clear DTCs

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

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

Powertrain > Engine > Trouble Codes

When the ECM, wire harnesses and connectors are normal, DTC P034015 will be stored when the connector of the sensor is disconnected.