Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001HT3C
Model Year Start: 2020 Model: Corolla Prod Date Range: [03/2019 - 11/2022]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0340; Camshaft Position Sensor Circuit; 2020 - 2023 MY Corolla [03/2019 - 11/2022]

DTC

P0340

Camshaft Position Sensor Circuit

DESCRIPTION

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

The intake camshaft has a timing rotor for the cam 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 cam position 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 and fuel injection timing.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P0340

Camshaft Position Sensor Circuit

One of the following conditions is met:

  • No cam position sensor signal to the ECM while cranking (2 trip detection logic).
  • No cam position sensor signal to the ECM at an engine speed of 600 rpm or higher (1 trip detection logic).
  • A missing cam position sensor signal despite the crank position sensor inputs being normal at an engine speed of 600 rpm or more (1 trip detection logic).
  • Open or short in cam position sensor (for intake camshaft) circuit
  • Cam position sensor (for intake camshaft)
  • Camshaft housing sub-assembly
  • ECM

Comes on

DTC stored

DTC for Mexico Models

- Applies

Reference: Inspection using an oscilloscope.

HINT:

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

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

If no pulse signal is transmitted by the cam position 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.

MONITOR STRATEGY

Related DTCs

P0340: Cam position sensor verify pulse input

Required Sensors/Components (Main)

Cam position sensor (for intake camshaft)

Required Sensors/Components (Related)

Crank position sensor

Frequency of Operation

Continuous

Duration

4 seconds:

Cam position sensor verify pulse input (case 2)

5 seconds:

Cam position sensor verify pulse input (case 1)

MIL Operation

2 driving cycles:

Cam position sensor verify pulse input (case 2)

Immediate:

Cam position sensor verify pulse input (case 1)

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Cam Position Sensor Verify Pulse Input (Case 1)

All of the following conditions are met

-

Engine speed

600 rpm or higher

Starter

Off

VVT system mis-alignment

Not detected

Cam position sensor range check fail (P0342, P0343)

Not detected

Cam position sensor voltage

0.3 to 4.7 V

Cam Position Sensor Verify Pulse Input (Case 2)

Monitor runs whenever the following DTCs are not stored

None

Both of the following conditions are met

-

Starter

On

Minimum battery voltage while starter on

Less than 11 V

TYPICAL MALFUNCTION THRESHOLDS

Cam Position Sensor Verify Pulse Input (Case 1)

Either of the following conditions is met

1 or 2

1. Camshaft position and crankshaft position alignment

Mis-alignment

2. Cam position sensor signal

No signal

Cam Position Sensor Verify Pulse Input (Case 2)

Cam position sensor signal

No signal

COMPONENT OPERATING RANGE

All of the following conditions are met

-

Cam position sensor signal

Signal input

Camshaft position and crankshaft position alignment

Aligned

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON.
  7. Turn the Techstream on.
  8. Start the engine.
  9. Idle the engine for 10 seconds or more.
  10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  11. 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.
  12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  13. Input the DTC: P0340.
  14. 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

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
  15. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs.

    Click here 2020 - 2022 MY Corolla [03/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: 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

CAUTION / NOTICE / HINT

HINT:

  • If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.
  • 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 HARNESS AND CONNECTOR

*a

Front view of wire harness connector

(to Cam Position Sensor (for Intake Camshaft))

HINT:

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

(a) Disconnect the cam position sensor (for intake camshaft) connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C10-3 (VC) - Body ground

Ignition switch ON

4.5 to 5.5 V

C10-1 (VVI+) - Body ground

Ignition switch ON

3.0 to 5.0 V

(d) Turn the ignition switch off and wait for at least 30 seconds.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C10-3 (VC) - C10-1 (VVI+)

Ignition switch off

1.425 to 1.575 kΩ

C10-2 (VVI-) - Body ground

Always

Below 1 Ω
NG

GO TO STEP 4

OK

2.

CHECK SENSOR INSTALLATION AND CONDUCT VISUAL INSPECTION (CAM POSITION SENSOR (FOR INTAKE CAMSHAFT))

*a

OK

*b

NG

*c

Clearance

(a) Visually check the cam position sensor (for intake camshaft) for damage.

(b) Check the cam position sensor (for intake camshaft) installation.

OK:

The cam position sensor (for intake camshaft) does not have any damage and is installed properly.

NG

SECURELY REINSTALL CAM POSITION SENSOR (FOR INTAKE CAMSHAFT)

OK

3.

INSPECT CAMSHAFT HOUSING SUB-ASSEMBLY (INTAKE CAMSHAFT)

(a) Inspect the timing rotor of the intake camshaft.

OK:

Camshaft timing rotor does not have any cracks or deformation.

HINT:

Perform "Inspection After Repair" after replacing the camshaft housing sub-assembly.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

OK

REPLACE CAM POSITION SENSOR (FOR INTAKE CAMSHAFT)

NG

REPLACE CAMSHAFT HOUSING SUB-ASSEMBLY 2020 - 2022 MY Corolla [03/2019 - 09/2022]; 2ZR-FAE (ENGINE MECHANICAL): CAMSHAFT: REMOVAL+ 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE MECHANICAL): CAMSHAFT: REMOVAL+

4.

CHECK HARNESS AND CONNECTOR (CAM POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM)

(a) Disconnect the cam position sensor (for intake camshaft) connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C10-1 (VVI+) - C77-82 (VV1+)

Always

Below 1 Ω

C10-2 (VVI-) - C77-115 (VV1-)

Always

Below 1 Ω

C10-3 (VC) - C77-116 (VCV1)

Always

Below 1 Ω

C10-1 (VVI+) or C77-82 (VV1+) - Body ground and other terminals

Always

10 kΩ or higher

C10-2 (VVI-) or C77-115 (VV1-) - Body ground and other terminals

Always

10 kΩ or higher

C10-3 (VC) or C77-116 (VCV1) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE ECM 2020 - 2022 MY Corolla [03/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): ECM: REMOVAL 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR