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                                                                                                                         DI-1 19
                                                DIAGNOSTICS        -   ENGINE
                                                                                                                          DI6VJ-02




    DTC              P1345                  VVT Sensor/Camshaft Position Sensor Cir-
                                            cuit Malfunction

CIRCUIT DESCRIPTION
VVT sensor (VVT signal) consist of a signal plate and pickup coil.
The VVT signal plate has 1 tooth on its outer circumference and is mounted on the intake camshafts.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change,
causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil.
The actual camshaft angle is detected by the VVT sensor and it provides feedback to the ECM to control
the intake valve timing in response to during condition.
  DTC No.                      DTC Detecting Condition                                                    Trouble Area
            No VVT sensor signal to ECM during cranking at 4 sec. or
            more
                                                                                 S Open or short in VVT sensor circuit
            No VVT sensor signal to ECM with 5 sec. or more engine
   P13450                                                                        S VVT sensor
            speed 600 rpm or more
                                                                                 S ECM
            While the crankshaft rotates twice, VVT sensor signal will be
            input to ECM 5 times


WIRING DIAGRAM


            C1
            Camshaft Position Sensor                                                                    ECM
                                                                                            18
                                        1                              B                       G2
                                                                                            E7

                                        2              W
                                                   (Shielded)

                                                                                            16
                                        2              W                           W           NE-
                                                                                            E7

                                                                                            17
                                        1              O                                       NE
                                                                                            E7                    E1
            C2                                     (Shielded)                BR
            Crankshaft Position Sensor                                      EB



                                                                                                                           A09056




2002 ECHO (RM884U)

                                                                                  Author :                     Date :     289
DI-120
                                           DIAGNOSTICS   -   ENGINE

INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean
or rich, etc. at the time of the malfunction.

   1      Check resistance of VVT sensor (See page IG-1 ).

                                               Reference: INSPECTION USING OSCILLOSCOPE
          G2 Signal Waveform    5 V/           During cranking or idling, check between terminals G2 and
                                Division       NE-, and NE+ and NE- of the ECM connector.
    G2                          NE-            HINT:
                                                S    The correct waveform is as shown.
                                                S    The waveform frequency is shortened as the engine
    NE+                         NE-                  speed becomes higher.

            20 msec./Division         A03961     NG          Replace VVT sensor.


   OK



   2      Check for open and short in harness and connector between ECM and VVT sen-
          sor (See page IN-29 ).


                                                 NG          Repair or replace harness or connector.


   OK



   3      Inspect sensor installation.


                                                 NG          Tighten sensor.


   OK



  Check and replace ECM (See page IN-29 ).




2002 ECHO (RM884U)

                                                                      Author :        Date :           290



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