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 Variable Valve Timing (VVT) sensor (VV1, 2 signal) of the intake camshaft consists of a magnet and MRE (Magnetoresistive 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 revolution. Based on a combination of the VVT 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 P0345	Either condition is met: There is no VVT sensor signal for 5 seconds at an engine speed of 600 rpm or more (1 trip detection logic). No VVT sensor signal is sent to the ECM during cranking (2 trip detection logic).	Open or short in VVT sensor circuit VVT sensor Camshaft timing gear assembly Timing chain has jumped tooth ECM
P0342 P0347	The output voltage of the VVT sensor is below 0.3 V for 4 seconds (1 trip detection logic).
P0343 P0348	The output voltage of the VVT sensor is higher than 4.7 V for 4 seconds (1 trip detection logic).

DTC No.

DTC Detection Condition

Trouble Area

P0340

P0345

Either condition is met:

There is no VVT sensor signal for 5 seconds at an engine speed of 600 rpm or more (1 trip detection logic).
No VVT sensor signal is sent to the ECM during cranking (2 trip detection logic).

Open or short in VVT sensor circuit
VVT sensor
Camshaft timing gear assembly
Timing chain has jumped tooth
ECM

P0342

P0347

The output voltage of the VVT sensor is below 0.3 V for 4 seconds (1 trip detection logic).

P0343

P0348

The output voltage of the VVT sensor is higher than 4.7 V for 4 seconds (1 trip detection logic).

Reference: Inspection using an oscilloscope (VV1, VV2 and NE Signal Waveforms).

Tech Tips

The correct waveforms are as shown.
VV1+ and VV2+ are the VVT sensor signals, and NE+ is the crankshaft position sensor signal.
Grounding failure of the shielded wire may cause noise in the waveforms.

Item	Content
Terminal	VV1+ - VV1- VV2+ - VV2- NE+ - NE-
Equipment Setting	5 V/DIV., 20 msec./DIV.
Condition	Cranking or idling

Item

Content

Terminal

VV1+ - VV1-

VV2+ - VV2-

NE+ - NE-

Equipment Setting

5 V/DIV.,

20 msec./DIV.

Condition

Cranking or idling

MONITOR DESCRIPTION

If no signal is transmitted by the VVT sensor despite the engine running, or the rotations of the camshaft and crankshaft are not synchronized, the ECM interprets this as a malfunction of the sensor.

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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.

PROCEDURE

CHECK VVT SENSOR (SENSOR POWER SOURCE)

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

Disconnect the VVT sensor connector.

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

Standard Voltage

Tester Connection	Condition	Specified Condition
C20-3 (VC) - Body ground	Always	4.5 to 5.0 V
C21-3 (VC) - Body ground	Always	4.5 to 5.0 V

Reconnect the VVT sensor connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

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
C20-1 (VVR+) - C34-9 (VV1+)	Always	Below 1 Ω
C20-2 (VVR-) - C34-10 (VV1-)	Always	Below 1 Ω
C21-1 (VVL+) - C34-12 (VV2+)	Always	Below 1 Ω
C21-2 (VVL-) - C34-11 (VV2-)	Always	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
C20-1 (VVR+) or C34-9 (VV1+) - Body ground	Always	10 kΩ or higher
C20-2 (VVR-) or C34-10 (VV1-) - Body ground	Always	10 kΩ or higher
C21-1 (VVL+) or C34-12 (VV2+) - Body ground	Always	10 kΩ or higher
C21-2 (VVL-) or C34-11 (VV2-) - Body ground	Always	10 kΩ or higher

Reconnect the VVT sensor connector.
Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

OK

OK
Sensor is installed correctly.

CHECK VALVE TIMING

Text in Illustration

*a Timing Mark

Remove the cylinder head cover sub-assembly RH and LH.
Turn the crankshaft to align the matchmarks 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.

Text in Illustration
*a	Timing Mark

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

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

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

ADJUST VALVE TIMING Click here

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

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

CHECK WHETHER DTC OUTPUT RECURS

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
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
No output	A
P0340, P0342, P0343, P0345, P0347 or P0348	B

Tech Tips

If the engine does not start, replace the ECM.

REPLACE ECM Click here

END