P0340

2UZ-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 VVT sensor consists of a magnet, an iron core and a pick-up coil. This sensor monitors a timing rotor located on the camshaft and is used by the ECM 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.
If there is no signal from the VVT sensor even though the engine is turning or the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction in the sensor and sets a DTC.





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: Inspect 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 revolving, or if the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All:





P0340, P0345 Case 1:





P0340, P0345 Case 2:





TYPICAL MALFUNCTION THRESHOLDS

P0340, P0345 Case 1:





P0340, P0345 Case 2:





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE
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 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 VVT SENSOR (RESISTANCE)




(a) Disconnect the V12 and V13 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 coils.
"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 V12 or V13 VVT sensor connector.
(b) Disconnect the E7 ECM connector.
(c) Measure the resistance between the wire harness side connectors.
Standard resistance:





(d) Reconnect the VVT sensor connector.
(e) Reconnect the ECM connector.
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 (TOOTH)
(a) Remove the cylinder head cover Removal.
(b) Check the tooth of the camshaft.
OK:
The camshaft does not have any cracks or deformation.
NG -- REPLACE CAMSHAFT
OK -- REPLACE ECM