P0340

2AZ-FXE ENGINE CONTROL: SFI SYSTEM: P0340: Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)


DESCRIPTION

The camshaft position sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed onto the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes through the camshaft position sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft turns twice, the voltage is generated 3 times in the camshaft position sensor. The generated voltage in the sensor acts as a signal, allowing the hybrid vehicle control ECU to locate the camshaft position. This signal is then used to control ignition timing, fuel injection timing, and the VVT system.





HINT
DTC P0340 indicates a malfunction relating to the camshaft position sensor circuit (the wire harness between the hybrid vehicle control ECU and camshaft position sensor, and the camshaft position sensor itself).

Reference: Inspection using an oscilloscope





HINT
- The correct waveform is as shown in the illustration.
- G2+ is the camshaft position sensor signal, and NE+ is the crankshaft position sensor signal.
- A failure of the ground for the shielding of the wiring may result in noisy waveforms.






MONITOR DESCRIPTION

If no signal is transmitted by the camshaft position sensor despite the engine revolving, or the rotation of the camshaft and the crankshaft is not synchronized, the hybrid vehicle control ECU interprets this as a malfunction of the sensor.

If the malfunction is not repaired successfully, the DTC is set 10 seconds after the engine is next started.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





TYPICAL MALFUNCTION THRESHOLDS







COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

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

- Clear the DTCs DTC Check / Clear.

- Turn the power switch off and wait for at least 30 seconds.

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

- Put the engine in inspection mode Component Tests and General Diagnostics.

- Start the engine.

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

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

- Read the DTC [C].

HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

- Input the DTC: P0340.

- Check the DTC judgment result.





HINT
If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [C] again.

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Read freeze frame data using Techstream. The hybrid vehicle control ECU 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.

PROCEDURE

1. INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE)

(a) Inspect the camshaft position sensor Testing and Inspection.

NG -- REPLACE CAMSHAFT POSITION SENSOR Removal
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the hybrid vehicle control ECU 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 hybrid vehicle control ECU connector.

(e) Reconnect the camshaft position sensor connector.

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

3. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)





(a) Check the camshaft position sensor installation.

OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL CAMSHAFT POSITION SENSOR
OK -- Continue to next step.

4. CHECK VALVE TIMING P0011

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

5. INSPECT INTAKE CAMSHAFT

(a) Check the teeth of the timing rotor of the intake camshaft.

OK:

Timing rotor does not have any cracks or deformation.

NG -- REPLACE INTAKE CAMSHAFT Removal
OK -- Continue to next step.

6. REPLACE CAMSHAFT POSITION SENSOR

(a) Replace the camshaft position sensor Removal.

NEXT -- Continue to next step.

7. CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Clear the DTCs DTC Check / Clear.

(e) Put the engine in inspection mode Component Tests and General Diagnostics.

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

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

(h) Read the DTCs.

Result:





HINT
If the engine does not start, replace the hybrid vehicle control ECU.

B -- REPLACE HYBRID VEHICLE CONTROL ECU Removal

A -- END