P0340

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 intake camshaft's Variable Valve Timing (VVT) sensor (G signal) consists of a magnet and MRE element.
The VVT camshaft drive gear has a sensor plate with 3 teeth on its outer circumference. When the gear rotates, changes occur in the air gaps between the sensor plate and pickup coil, which affects the magnet. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the gear rotation data to pulse signals, and uses the pulse signals to determine the camshaft angle, which it sends to the ECM (Included in HV control ECU). Then the ECM (Included in HV control ECU) uses this data to control fuel injection time and injection timing.
The crankshaft angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine revolution. Based on the G signal and actual crankshaft angle, the ECM detects the normal crankshaft angle. Also, based on the NE signal, the ECM detects the engine speed.










- Reference: Inspection using an oscilloscope
HINT:
- The correct waveform is shown.
- 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 revolving, or the rotations of the camshaft and the crankshaft are not synchronized, the ECM (Included in HV 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 Techstream. The ECM (Included in HV control ECU) records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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. CHECK ECU TERMINAL VOLTAGE (VV1+, VV2+, NE+ AND NE- TERMINALS)





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






NG -- REPLACE VVT SENSOR
OK -- Continue to next step.
2. CHECK VVT SENSOR (SENSOR RESISTANCE)





(a) Disconnect the V4 or V5 VVT sensor connector.
(b) Measure the resistance between the terminals of the sensor.
Standard resistance:





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





(a) Disconnect the V4 or V5 VVT sensor connector.
(b) Disconnect the H31 HV 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 HV control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK SENSOR INSTALLATION (VVT SENSOR)





(a) Check the CKP sensor installation.
OK:
Sensor is installed correctly.
NG -- TIGHTEN SENSOR
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 HV CONTROL ECU