P0340

3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340,P0345: Camshaft Position Sensor Circuit Malfunction
P0345 - Camshaft Position Sensor "A" Circuit (Bank 2)

DESCRIPTION

The Variable Valve Timing (VVT) sensor consists of a magnet, iron core and pickup coil. The VVT signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley. When the camshafts rotate, changes occur on the camshaft protrusions and in the pickup coil air gaps. These changes cause fluctuations in the magnetic field and generate voltage in the pickup coil.

Each sensor monitors its timing rotor, which is located on the camshaft. The ECM uses the sensor to detect the camshaft angle. The camshaft rotation synchronizes with the crankshaft rotation, and this sensor communicates the rotation of the camshaft timing rotor as a pulse signal to the ECM. Based on the signal, the ECM controls the camshaft positions.





HINT
DTC P0340 and P0345 indicate a malfunction related to the VVT sensor (+) circuit

(wire harness (from ECM to VVT sensor) and VVT sensor).





- Reference: Inspection using an oscilloscope.

- During cranking or idling, check the waveform of the ECM connector.





MONITOR DESCRIPTION

If there is no signal from the VVT sensor even though the engine is running, or if the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

This monitor runs for 10 seconds (the first 10 seconds of engine idle) after the engine is started.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All:





VVT sensor range check:





VVT sensor range check (after starting engine):





TYPICAL MALFUNCTION THRESHOLDS

VVT sensor range check:





VVT sensor range check (after starting engine):





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

- Turn the ignition switch to ON and turn the Techstream on.

- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

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

- Turn the ignition switch to ON and turn the Techstream on [A].

- Start the engine.

- 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: P0340 or P0345.

- Check the DTC judgment result.





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

- 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





INSEPCTION PROCEDURE

HINT
- If DTC P0340 is displayed, check the left bank VVT sensor.
- If DTC P0345 is displayed, check the right bank VVT sensor.
- Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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. INSPECT VVT SENSOR (RESISTANCE)





(a) Disconnect the V5 and V6 VVT sensor connectors.

(b) Measure the resistance of the VVT sensor.

Standard Resistance:





HINT
In the above chart, the terms "Cold" and "Hot" refer to the temperature of the sensor.

"Cold" means approximately -10 to 50°C (14 to 122°F).

"Hot" means approximately 50 to 100°C (122 to 212°F).

NG -- REPLACE VVT SENSOR
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM)





(a) Disconnect the V5 and V6 VVT sensor connectors.

(b) Disconnect the E2 and E4 ECM connectors.

(c) Measure the resistance of the wire harness side connectors.

Standard Resistance:





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

3. CHECK SENSOR INSTALLATION (VVT SENSOR)





(a) Check the sensor installation.

OK:

Sensor is installed correctly.

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

4. CHECK CAMSHAFT TIMING PULLEY

(a) Check the teeth of the camshaft timing pulley.

OK:

Timing pulley's teeth have no deformation or cracks.

NG -- REPLACE CAMSHAFT TIMING PULLEY

OK -- REPLACE ECM Service and Repair