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cip0335


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DI-72
                                                DIAGNOSTICS       -    ENGINE
                                                                                                                                         DI6VA-04




    DTC               P0335                 Crankshaft Position Sensor "A" Circuit
                                            Malfunction

CIRCUIT DESCRIPTION
Crankshaft position sensor (NE signal) consist of a signal plate and pick up coil.
The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34
signals of every engine revolution. The ECM detects the standard crankshaft angle based on the G2 signals,
and the actual crankshaft angle the engine speed by the NE signals.

  DTC No.                      DTC Detecting Condition                                                    Trouble Area
              No crankshaft position sensor signal to ECM during cranking.      S Open or short in crankshaft position sensor circuit.
             (2 trip detection logic)                                           S Crankshaft position sensor
                                                                                                osition
   P0335     No crankshaft position sensor signal to ECM with engine            S Signal plate (Timing belt guide)
             speed 600 rpm or more                                              S Crankshaft timing pulley
              (2 trip detection logic)                                          S ECM

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 :                     242
                                                                                                        DI-73
                                            DIAGNOSTICS   -   ENGINE

INSPECTION PROCEDURE
HINT:
S       Perform troubleshooting of DTC 335 1st. If notrouble is found, troubleshoot the following mechanical
        system.
S       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 warmed up or not, the air-fuel
        ratio lean or rich, etc. at the time of the malfunction.

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

                                                  Reference: INSPECTION USING OSCILLOSCOPE
          G2, NE signal waveforms
                                                  During cranking or idling, check between terminals G2 and
                                                  NE-, NE and NE- of the ECM
                                    5V/
    G2                              Division      HINT:
                                                  The correct waveforms are as shown.

    NE

          20 m sec./Division (Idling)    A03961




                                                    NG        Replace crankshaft position sensor.


    OK



    2      Check for open and short in harness and connector between ECM and
           crankshaft position sensor (See page IN-29 ).


                                                    NG        Repair or replace harness or connector.


    OK




2002 ECHO (RM884U)

                                                                   Author :          Date :             243
DI-74
                                  DIAGNOSTICS   -   ENGINE



   3    Inspect crankshaft position sensor installation and teeth of crankshaft timing
        pulley (See page IG-1 1, EM-13 ).


                                         NG         Tighten the sensor.
                                                    Replace crankshaft timing pulley.


  OK



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




2002 ECHO (RM884U)

                                                             Author :       Date :       244



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