P0345
1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340: Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)
DTC P0340 - Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)
DTC P0342 - Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)
DTC P0343 - Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)
DTC P0345 - Camshaft Position Sensor "A" Circuit (Bank 2)
DTC P0347 - Camshaft Position Sensor "A" Circuit Low Input (Bank 2)
DTC P0348 - Camshaft Position Sensor "A" Circuit High Input (Bank 2)
DESCRIPTION
The intake camshaft's Variable Valve Timing (VVT) sensor (G signal) consists of a magnet and MRE (Magneto Resistance 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 MRE, which affect the magnetic field. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the gear rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM.
The crankshaft angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine revolution. Based on the combination of the G signal and NE signal, the ECM detects the crankshaft angle. Then the ECM uses this data to control fuel injection time and injection timing. Also, based on the NE signal, the ECM detects the engine speed.
- Reference: Inspection using an oscilloscope
HINT:
- The correct waveform is shown above.
- 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 interprets this as a malfunction of the sensor.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All:
P0340 VVT Sensor Range Check:
P0340 Camshaft Position/Crankshaft Position Misalignment:
P0340, P0342, P0343 VVT Sensor Range Check (Fluctuating, Low voltage, High voltage):
P0345 VVT Sensor Range Check (While starting engine):
P0345 VVT Sensor Range Check (After starting engine):
P0345, P0347, P0348 VVT Sensor Range Check (Fluctuating, Low voltage, High voltage):
TYPICAL MALFUNCTION THRESHOLDS
P0340 VVT Sensor Range Check:
P0340 Camshaft Position/Crankshaft Position Misalignment:
P0340 VVT Sensor Range Check (Fluctuating):
P0342 VVT Sensor Range Check (Low voltage):
P0343 VVT Sensor Range Check (High voltage):
P0345 VVT Sensor Range Check (While starting engine):
P0345 VVT Sensor Range Check (After starting engine):
P0345 VVT Sensor Range Check (Fluctuating):
P0347 VVT Sensor Range Check (Low voltage):
P0348 VVT Sensor Range Check (High voltage):
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT: Read freeze frame data using a 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 ECM TERMINAL VOLTAGE
(a) Inspect the ECM using an oscilloscope.
(1) While the engine is idling, check the waveform between the terminals of the ECM connector.
OK:
OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM)
(a) Disconnect the B15 or B27 VVT sensor connector.
(b) Disconnect the B1 and B3 ECM 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 ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK VVT SENSOR (SENSOR POWER SOURCE)
(a) Disconnect the B15 or B27 VVT sensor connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(c) Reconnect the VVT sensor connector.
NG -- REPLACE ECM
OK -- Continue to next step.
4. CHECK SENSOR INSTALLATION (VVT SENSOR)
(a) Check the VVT sensor installation.
OK:
Sensor is installed correctly.
NG -- SECURELY REINSTALL SENSOR
OK -- Continue to next step.
5. CHECK VALVE TIMING P0011
NG -- ADJUST VALVE TIMING
OK -- Continue to next step.
6. CHECK CAMSHAFT TIMING GEAR ASSEMBLY (TEETH 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 -- Continue to next step.
7. REPLACE VVT SENSOR
NEXT -- Continue to next step.
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342, P0343, P0345, P0347 AND/OR P0348)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Clear DTCs DTC Check / Clear.
(e) Start the engine.
(f) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(g) Read DTCs.
Result:
HINT: If the engine does not start, replace the ECM.
B -- REPLACE ECM
A -- END