SFI SYSTEM (w/o EGR 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 crank angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine rotation. Based on combination of the VVT signals 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	Missing VVT sensor signal despite crankshaft position sensor inputs normal at engine speed of 600 rpm or more (1 trip detection logic)	Open or short in VVT sensor circuit VVT sensor Camshaft timing gear assembly Valve timing ECM
P0342 P0347	Output voltage of VVT sensor is less than 0.3 V for 4 seconds (1 trip detection logic)	Open or short in VVT sensor circuit VVT sensor Camshaft timing gear assembly ECM
P0343 P0348	Output voltage of VVT sensor is more than 4.7 V for 4 seconds (1 trip detection logic)	Open or short in VVT sensor circuit VVT sensor Camshaft timing gear assembly ECM
P0345	No VVT sensor signal at engine speed of 600 rpm or more (1 trip detection logic)	Open or short in VVT sensor circuit VVT sensor Camshaft timing gear assembly Valve timing ECM

Reference: Inspection using an oscilloscope Click here.

WIRING DIAGRAM

Refer to DTC P0335 Click here.

INSPECTION PROCEDURE

Tech Tips

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 help determine if the vehicle was moving or stationary, 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.
If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.

PROCEDURE

CHECK VVT SENSOR (SENSOR POWER SOURCE)

Disconnect the VVT sensor connector.
Turn the power switch on (IG).

Text in Illustration
*1	Front view of wire harness connector (to VVT Sensor)
*2	Bank 1
*3	Bank 2

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
D22-3 (VC) - Body ground	Power switch on (IG)	4.5 to 5.5 V
D23-3 (VC) - Body ground	Power switch on (IG)	4.5 to 5.5 V

Reconnect the VVT sensor connector.

CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM) Click here

CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM)

Disconnect the VVT sensor connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open)

Tester Connection	Condition	Specified Condition
D22-1 (VVR+) - D1-109 (VV1+)	Always	Below 1 Ω
D22-2 (VVR-) - D1-110 (VV1-)	Always	Below 1 Ω
D23-1 (VVL+) - D1-112 (VV2+)	Always	Below 1 Ω
D23-2 (VVL-) - D1-111 (VV2-)	Always	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
D22-1 (VVR+) or D1-109 (VV1+) - Body ground	Always	10 kΩ or higher
D22-2 (VVR-) or D1-110 (VV1-) - Body ground	Always	10 kΩ or higher
D23-1 (VVL+) or D1-112 (VV2+) - Body ground	Always	10 kΩ or higher
D23-2 (VVL-) or D1-111 (VV2-) - Body ground	Always	10 kΩ or higher

Reconnect the VVT sensor connector.
Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR - ECM)

CHECK SENSOR INSTALLATION (VVT SENSOR)
1. Check the VVT sensor installation.
  
  OK
  
  Sensor is installed correctly.
NG
SECURELY REINSTALL VVT SENSOR Click here

OK
CHECK CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF PLATE)
1. 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

OK
Sensor is installed correctly.

OK
Sensor plate teeth do not have any cracks or deformation.

CHECK VALVE TIMING (CHECK FOR LOOSE OR JUMPED TEETH ON TIMING CHAIN)

Remove the cylinder head cover sub-assemblies RH and LH.
Turn the crankshaft to align the timing marks of the crankshaft.
Align the notch of the crankshaft pulley to the "0" position.
Check if the timing marks of the camshaft pulley and camshaft bearing cap align.

Turn the crankshaft clockwise 360° if the timing marks do not align. Check if they align once again.

The timing marks of the camshaft pulley and the camshaft bearing cap align when the notch of the crankshaft pulley is in the "0" position.

Text in Illustration
*1	Timing Mark

Reinstall the cylinder head cover sub-assemblies RH and LH.

ADJUST VALVE TIMING Click here

REPLACE VVT SENSOR
1. Replace the VVT sensor Click here.
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342, P0343, P0345, P0347 AND/OR P0348)

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Turn the tester on.
Clear the DTCs Click here.
Start the engine.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Result

Result	Proceed to
DTC is not output	A
DTC P0340, P0342, P0343, P0345, P0347 and/or P0348 are output	B