P0345
4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340: Camshaft Position Sensor Circuit Malfunction
DTC P0340 - Camshaft Position Sensor Circuit Malfunction
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 affects 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 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 as 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 interprets this as a malfunction of the sensor.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All:
P0340 (Engine running):
P0345 (Engine running):
P0340 (Cranking):
P0340, P0342, P0343 (Chattering, Low voltage, High voltage):
P0345, P0347, P0348 (Chattering, Low voltage, High voltage):
TYPICAL MALFUNCTION THRESHOLDS
P0340 (Engine running):
P0340 (Cranking):
P0340 (Chattering):
P0342 (Low voltage):
P0343 (High voltage):
P0345 (Engine running, cranking):
P0345 (Chattering):
P0347 (Low voltage):
P0348 (High voltage):
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using 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 Freeze Frame Data.
PROCEDURE
1. CHECK 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.
Standard:
OK -- REPLACE ECM
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE)
(a) Disconnect the E19 or E30 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 -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE CAMSHAFT - ECM)
(a) Disconnect the E19 or E30 VVT sensor connector.
(b) Disconnect the E3 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.
4. CHECK VVT SENSOR FOR INTAKE CAMSHAFT (SENSOR INSTALLATION)
(a) Check the CKP sensor installation.
OK:
Sensor is installed correctly.
NG -- REPAIR OR REPLACE VVT 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 VVT SENSOR