SFI SYSTEM, Diagnostic DTC:P1340, P1342, P1343

DESCRIPTION

The camshaft position sensor system consists of a signal plate (installed on the camshaft timing gear RH) and Magnetic Resistance Element (MRE) type cam position sensor. The signal plate has 3 protrusions. When it rotates, the magnetic vector (direction of magnetic field) applied to the camshaft's MRE varies, which causes its resistance to vary. This varying resistance is converted to voltage, and then modified into a rectangular waveform with Hi (approximately 4 V) and Lo (approximately 1 V) outputs. As a result, the G2 signal is output to the ECM. The ECM uses the G2 signal to distinguish between the cylinders and detect the camshaft position.

• 

  *a	NE and G2 Signal Waveform
  *b	5 V/DIV.
  *c	20 msec./DIV.

  Reference: Inspection using an oscilloscope.

  Tech Tips

  
  

  • The correct waveform is as shown.

  
  

  • G2+ stand for the camshaft position sensor signal, and NE+ stands for the CKP sensor signal.

  Item	Content
  Terminal	NE+ - NE- G2+ - G2-
  Equipment Setting	5 V/DIV., 20 msec./DIV.
  Condition	Cranking or idling

MONITOR DESCRIPTION

If there is no signal from the camshaft position sensor even though the engine is running, or if the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

When the sensor output voltage remains less than 0.3 V, or more than 4.7 V for more than 5 seconds, the ECM sets a DTC.

WIRING DIAGRAM

*a	Camshaft Position Sensor

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK CAMSHAFT POSITION SENSOR (SENSOR POWER SOURCE)

   

   *1	Front view of wire harness connector: (to CMP Sensor)

   
   

   1. Disconnect the E20 camshaft position sensor connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition E20-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.0 V

   
   

   NG

   CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) Click here

   OK

2. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

   

   *1	Front view of wire harness connector: (to CMP Sensor)
   *2	ECM Connector

   
   

   1. Disconnect the E20 camshaft position sensor connector.

   2. Disconnect the E2 ECM connector.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition E20-1 (G22+) - E2-24 (G2+) Always Below 1 Ω E20-2 (G22-) - E2-32 (G2-) Always Below 1 Ω

      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition E20-1 (G22+) or E1-24 (G2+) - Body ground Always 10 kΩ or higher E20-2 (G22-) or E1-32 (G2-) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK SENSOR INSTALLATION

   

   *1

   Clearance

   
   

   1. Check the sensor installation.

      OK
      Sensor is installed correctly.

   
   

   NG

   SECURELY REINSTALL Click here

   OK

4. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (BANK 2)

   
   

   1. Check the teeth of the sensor plate.

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

   
   

   NG

   REPLACE CAMSHAFT TIMING GEAR ASSEMBLY (BANK 2) Click here

   OK

5. CHECK VALVE TIMING

   

   *a	Timing Mark

   
   

   1. Remove the cylinder head cover bank 1 and bank 2.

   2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.

   3. Rotate the crankshaft pulley and align its notch to timing mark 0 of the timing chain cover. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration.

      OK
      Timing marks on camshaft timing gears are aligned as shown in the illustration.

   4. Reinstall the cylinder head cover.

   
   

   NG

   ADJUST VALVE TIMING

   OK

6. REPLACE CAMSHAFT POSITION SENSOR

   
   

   1. Replace the camshaft position sensor Click here.

   
   

   NEXT

7. CHECK WHETHER DTC OUTPUT RECURS (DTC P1340, P1342 AND/OR P1343)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the tester ON.

   4. Clear DTCs Click here.

   5. Start the engine.

   6. Enter the following menus: Powertrain / Engine / DTC.

   7. Read the DTCs.

      Result
      Display (DTC Output) Proceed to No output A P1340, P1342 and P1343 B

      Tech Tips

      If the engine does not start, replace the ECM.

   
   

   A

   END

   B

   REPLACE ECM Click here

8. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

   

   *1	Front view of wire harness connector: (to CMP Sensor)
   *2	ECM Connector

   
   

   1. Disconnect the E20 camshaft position sensor connector.

   2. Disconnect the E1 ECM connector.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition E20-3 (VC) - E1-18 (VC) Always Below 1 Ω

      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition E20-3 (VC) or E1-18 (VC) - Body ground Always 10 kΩ or higher

   
   

   OK

   REPLACE ECM Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR