P0345

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

DTC P0340 - Camshaft Position Sensor Circuit Malfunction

DTC P0341 - Camshaft Position Sensor "A" Circuit Range / Performance (Bank 1 or Single Sensor)

DTC P0345 - Camshaft Position Sensor "A" Circuit (Bank 2)

DTC P0346 - Camshaft Position Sensor "A" Circuit Range / Performance (Bank 2)

DESCRIPTION

The VVT (Variable Valve Timing) sensor (G signal) consists of a magnet, iron core and pickup coil.
The G signal plate has a 3 teeth on its outer circumference and is installed on the camshaft timing pulley. When the camshaft rotate, the protrusion on the signal plate and the air gap on the pickup coil change, causing fluctuations in the magnetic field and generating a voltage in the pickup coil.
This sensor monitors a timing rotor located on the camshaft and is used to detect a camshaft angle by the ECM (included in the hybrid vehicle control ECU). The camshaft rotation synchronizes with the crankshaft rotation, and this sensor communicates the rotation of the camshaft rotor as a pulse signal to the ECM. Based on the signal, the ECM controls fuel injection timing and ignition timing.






Reference: Inspection using an oscilloscope





HINT:
- The correct waveform is as shown in the illustration.
- VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the CKP sensor signal.





MONITOR DESCRIPTION

If no signal is transmitted by the VVT sensor despite the engine rotating, or the rotations of the camshaft and the crankshaft are not synchronized, the ECM (included in the hybrid vehicle control ECU) interprets this as a malfunction of the sensor.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All:





P0340:





P0341:





P0345:





P0346:





TYPICAL MALFUNCTION THRESHOLDS

P0340:





P0341:





P0345:





P0346:





COMPONENT OPERATING RANGE





WIRING DIAGRAM






INSPECTION PROCEDURE
HINT: Read freeze frame data using the Techstream. The ECM (included in 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. CHECK ECU TERMINAL VOLTAGE (VV1+, VV2+, NE+ AND NE- TERMINALS)





(a) Inspect the hybrid vehicle control ECU using an oscilloscope.
(1) While the engine is idling, check the waveform between the terminals of the hybrid vehicle control ECU connector.
Standard:






NG -- CHECK VVT SENSOR (SENSOR RESISTANCE)
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
2. CHECK VVT SENSOR (SENSOR RESISTANCE)





(a) Disconnect the VVT sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reconnect the VVT sensor connector.
NG -- REPLACE VVT SENSOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (VVT SENSOR - HYBRID VEHICLE CONTROL ECU)





(a) Disconnect the VVT sensor connector.
(b) Disconnect the B3 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 VVT sensor connector.
(e) Reconnect the hybrid vehicle control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK SENSOR INSTALLATION (VVT SENSOR)





(a) Check the VVT sensor installation.
OK:
Sensor is installed correctly.
NG -- REPAIR OR REPLACE VVT
OK -- Continue to next step.
5. CHECK CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF PLATE)
(a) Check the teeth of the signal plate.
OK:
Sensor plate teeth do not have any cracks or deformation.
NG -- REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
OK -- REPLACE HYBRID VEHICLE CONTROL ECU