SFI SYSTEM, Diagnostic DTC:P0340, P0342, P0343, P0345, P0347, P0348
| DTC Code | DTC Name |
|---|---|
| P0340 | Camshaft Position Sensor Circuit Malfunction |
| P0342 | Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor) |
| P0343 | Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor) |
| P0345 | Camshaft Position Sensor "A" Circuit (Bank 2) |
| P0347 | Camshaft Position Sensor "A" Circuit Low Input (Bank 2) |
| P0348 | Camshaft Position Sensor "A" Circuit High Input (Bank 2) |
DESCRIPTION
The intake camshaft's VVT sensor (VV1, VV2 signal) consists of a magnet and MRE (Magneto Resistive 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 rotation. Based on 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.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0340 |
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| P0345 |
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| P0342 P0347 |
Output voltage of VVT sensor is 0.3 V or less for 4 seconds (1 trip detection logic) |
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| P0343 P0348 |
Output voltage of VVT sensor is 4.7 V or more for 4 seconds (1 trip detection logic) |
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Reference: Inspection using an oscilloscope
Tech Tips
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The correct waveform is as shown.
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VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the crankshaft position sensor signal.
Item Content Terminal NE+ - NE-
VV1+ - VV1-
VV2+ - VV2-
Equipment Setting 5 V/DIV.
20 ms./DIV.
Condition Idling with warm engine -
WIRING DIAGRAM
Refer to DTC P0335 Click here.
INSPECTION PROCEDURE
Tech Tips
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Read freeze frame data using the intelligent tester. 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.
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If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
PROCEDURE
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CHECK VVT SENSOR FOR INTAKE SIDE (SENSOR POWER SOURCE)
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Disconnect the VVT sensor connector.
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Turn the engine switch on (IG).
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Measure the voltage according to the value(s) in the table below.
Standard Voltage Tester Connection Switch Condition Specified Condition D38-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.5 V D19-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.5 V -
Reconnect the VVT sensor connector.
NG 
CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM) Click here
OK 
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CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)
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Disconnect the VVT sensor connector.
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Disconnect the ECM connector.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D38-1 (VVR+) - D1-69 (VV1+) Always Below 1 Ω D38-2 (VVR-) - D1-92 (VV1-) Always Below 1 Ω D19-1 (VVL+) - D1-67 (VV2+) Always Below 1 Ω D19-2 (VVL-) - D1-90 (VV2-) Always Below 1 Ω Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D38-1 (VVR+) or D1-69 (VV1+) - Body ground Always 10 kΩ or higher D38-2 (VVR-) or D1-92 (VV1-) - Body ground Always 10 kΩ or higher D19-1 (VVL+) or D1-67 (VV2+) - Body ground Always 10 kΩ or higher D19-2 (VVL-) or D1-90 (VV2-) - Body ground Always 10 kΩ or higher -
Reconnect the VVT sensor connector.
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Reconnect the ECM connector.
NG 
REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)
OK
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CHECK SENSOR INSTALLATION (VVT SENSOR FOR INTAKE SIDE)
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Check the VVT sensor installation.
OK Sensor is installed correctly.
NG
REPAIR OR REPLACE VVT SENSOR FOR INTAKE SIDE Click here
OK
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CHECK CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF PLATE)
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Check the teeth of the signal plate.
OK Sensor plate teeth do not have any cracks or deformation.
NG
REPLACE CAMSHAFT TIMING GEAR ASSEMBLY Click here
OK
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REPLACE VVT SENSOR FOR INTAKE SIDE
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Replace the VVT sensor Click here.
NEXT
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CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342, P0343, P0345, P0347 AND/OR P0348)
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Connect the intelligent tester to the DLC3.
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Turn the engine switch on (IG).
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Turn the tester on.
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Clear the DTCs Click here.
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Start the engine.
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Enter the following menus: Powertrain / Engine / DTC.
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Read the DTCs.
Result Result Proceed to DTC is not output A DTC P0340, P0342, P0343, P0345, P0347 and/or P0348 are output B Tech Tips
If the engine does not start, replace the ECM.
B
REPLACE ECM Click here
A 
END
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CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)
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Disconnect the VVT sensor connector.
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Disconnect the ECM connector.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D38-3 (VC) - D1-115 (VCV1) Always Below 1 Ω D19-3 (VC) - D1-113 (VCV2) Always Below 1 Ω Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D38-3 (VC) or D1-115 (VCV1) - Body ground Always 10 kΩ or higher D19-3 (VC) or D1-113 (VCV2) - Body ground Always 10 kΩ or higher -
Reconnect the VVT sensor connector.
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Reconnect the ECM connector.
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)
OK
REPLACE ECM Click here
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