Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di eg cip0340

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                                                                                                                                  DI-75
                                                DIAGNOSTICS       -   ENGINE
                                                                                                                                  DI6VB-01




    DTC                P0340               Camshaft Position Sensor Circuit
                                           Malfunction

CIRCUIT DESCRIPTION
Camshaft position sensor (G22 signal) consist of signal plate and pick up coil.
The G22 signal plate has one tooth on its outer circumference and is mounted on the exhaust camshaft.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pick up coil change,
causing fluctuations in the magnetic field and generating an electromotive force in the pick up coil.
The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34
signals for every engine revolution. The ECM detects the standard crankshaft angle based on the G22 sig-
nals and the actual crankshaft angle and the engine speed by the NE signals.
   DTC No.                      DTC Detecting Condition                                              Trouble Area
              No camshaft position sensor signal to ECM during cranking.    S Open or short in camshaft position sensor circuit
              (2 trip detection logic)                                      S Camshaft position sensor
                                                                                         osition
   P0340
              No camshaft position sensor signal to ECM with engine speed   S Camshaft timing pulley
              600 rpm or more                                               S ECM

WIRING DIAGRAM
Refer to DTC P0335 (Crankshaft Position Sensor "A" Circuit Malfunction) on page DI-72 for the WIRING
DIAGRAM.

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 warmed up or not, the air-fuel ratio lean or rich, etc.
at the time of the malfunction.

   1       Check resistance of camshaft position sensor (Signal generator)
           (See page IG-1 ).

Reference: INSPECTION USING OSCILLOSCOPE
Refer to DTC P0335 (Crankshaft Position Sensor "A" Circuit Malfunction) on page DI-72 for the INSPEC-
TION USING OSCILLOSCOPE.

                                                          NG          Replace camshaft position sensor.


   OK




 2002 ECHO (RM884U)

                                                                             Author :                     Date :                  245
DI-76
                                  DIAGNOSTICS   -   ENGINE



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


                                         NG         Repair or replace harness or connector.


  OK



   3    Inspect sensor installation and tooth of camshaft timing pulley
        (See page EM-15 ).


                                         NG         Tighten the sensor.
                                                    Replace camshaft timing pulley.


  OK



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




2002 ECHO (RM884U)

                                                             Author :       Date :            246



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