P0340

3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340: Camshaft Position Sensor Circuit Malfunction

DTC P0340 - Camshaft Position Sensor Circuit Malfunction

DTC 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





WIRING DIAGRAM





INSPECTION 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:





NOTE:
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 WIRE HARNESS (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 AND 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