SFI SYSTEM, Diagnostic DTC:P0340, P0342, P0343, P0345, P0347, P0348

DESCRIPTION

The intake camshaft VVT sensor (VV1 and VV2 signal) consists of a magnet and MRE (Magnetoresistive Element).

The intake camshaft has 3 teeth on its outer circumference. When the intake camshaft rotates, changes occur in the air gaps between the 3 teeth and MRE, which affects the magnetic field. As a result, the resistance of the MRE fluctuates. The VVT sensor converts the camshaft rotation data into pulse signals, uses the pulse signals to determine the camshaft angle, and sends the data to the ECM.

The crankshaft angle sensor rotor has 34 teeth. The MRE generates 34 signals for each crankshaft 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.

• 

  *a	VV1, VV2 and NE Signal Waveforms
  *b	5 V/DIV.
  *c	20 msec./DIV.

  Reference: Inspection using an oscilloscope

  Standard
  for RHD Tester Connection Tool Setting Condition Specified Condition C46-110 (NE+) - C46-111 (NE-) 5 V/DIV. 20 msec./DIV. Cranking or idling The correct waveform is as shown C46-92 (VV1+) - C46-91 (VV1-) 5 V/DIV. 20 msec./DIV. Cranking or idling The correct waveform is as shown C46-87 (VV2+) - C46-88 (VV2-) 5 V/DIV. 20 msec./DIV. Cranking or idling The correct waveform is as shown
  for LHD Tester Connection Tool Setting Condition Specified Condition C45-110 (NE+) - C45-111 (NE-) 5 V/DIV. 20 msec./DIV. Cranking or idling The correct waveform is as shown C45-92 (VV1+) - C45-91 (VV1-) 5 V/DIV. 20 msec./DIV. Cranking or idling The correct waveform is as shown C45-87 (VV2+) - C45-88 (VV2-) 5 V/DIV. 20 msec./DIV. Cranking or idling The correct waveform is as shown

  Tech Tips

  VV1 and VV2 are the VVT sensor signals, and NE is the crankshaft position sensor signal.

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.

Also, when the sensor output voltage remains at below 0.3 V, or higher than 4.7 V for more than 4 seconds, the ECM stores a DTC.

CONFIRMATION DRIVING PATTERN

1. Start the engine and run it at idle for 10 seconds or more.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE)

   

   Text in Illustration

   *a	Front view of wire harness connector (to VVT Sensor)
   *b	Bank 1
   *c	Bank 2

   
   

   1. Disconnect the VVT sensor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition 3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.0 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

2. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE CAMSHAFT - ECM)

   
   

   1. Disconnect the VVT sensor connector.

   2. Disconnect the ECM connector.

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

      Standard Resistance
      for RHD Tester Connection Condition Specified Condition C100-1 (VVL+) - C46-92 (VV1+) Always Below 1 Ω C100-2 (VVL-) - C46-91 (VV1-) Always Below 1 Ω C101-1 (VVR+) - C46-87 (VV2+) Always Below 1 Ω C101-2 (VVR-) - C46-88 (VV2-) Always Below 1 Ω C100-1 (VVL+) or C46-92 (VV1+) - Body ground Always 10 kΩ or higher C100-2 (VVL-) or C46-91 (VV1-) - Body ground Always 10 kΩ or higher C101-1 (VVR+) or C46-87 (VV2+) - Body ground Always 10 kΩ or higher C101-2 (VVR-) or C46-88 (VV2-) - Body ground Always 10 kΩ or higher
      for LHD Tester Connection Condition Specified Condition C100-1 (VVL+) - C45-92 (VV1+) Always Below 1 Ω C100-2 (VVL-) - C45-91 (VV1-) Always Below 1 Ω C101-1 (VVR+) - C45-87 (VV2+) Always Below 1 Ω C101-2 (VVR-) - C45-88 (VV2-) Always Below 1 Ω C100-1 (VVL+) or C45-92 (VV1+) - Body ground Always 10 kΩ or higher C100-2 (VVL-) or C45-91 (VV1-) - Body ground Always 10 kΩ or higher C101-1 (VVR+) or C45-87 (VV2+) - Body ground Always 10 kΩ or higher C101-2 (VVR-) or C45-88 (VV2-) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK SENSOR INSTALLATION (VVT SENSOR FOR INTAKE CAMSHAFT)

   
   
   1. 

      *1

      Clearance

      Check the VVT sensor installation.

      OK
      Sensor is installed correctly.

   
   

   NG

   SECURELY REINSTALL SENSOR Click here

   OK

4. INSPECT INTAKE CAMSHAFT (TEETH)

   
   

   1. Check the teeth of the camshaft.

      OK
      Teeth do not have any cracks or deformation.

   
   

   NG

   REPLACE INTAKE CAMSHAFT Click here

   OK

5. REPLACE VVT SENSOR

   
   

   1. Replace the VVT sensor Click here.

   
   

   NEXT

6. CHECK WHETHER DTC OUTPUT RECURS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

   4. Clear DTCs.

   5. Start the engine and idle it for 10 seconds or more.

   6. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

   7. Read DTCs.

      Result

      Result	Proceed to
      No DTC is output	A
      P0340, P0342, P0343, P0345, P0347 or P0348 is output	B

      Tech Tips

      If the engine does not start, replace the ECM.

   
   

   A

   END

   B

   REPLACE ECM Click here