Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di eg cip1780

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                                                  DIAGNOSTICS       -   ENGINE

    DTC                P1780                Park/Neutral Position Switch Malfunction
                                            (Only for A/T)

The park/neutral position switch goes on when the shift lever is in the N or P shift position. When it goes on
terminal NSW of the ECM is grounded to body ground via the starter relay thus the terminal NSW voltage
becomes 0V. When the shift lever is in the D, 2, L, or R position, the park/neutral position switch goes off,
so the voltage of ECM. Terminal NSW becomes battery positive voltage, the voltage of the ECM internal
power source.
If the shift lever is moved from the N position to the D position, this signal is used for air-fuel ratio correction
and for idle speed control (estimated control), etc.

   DTC No.                       DTC Detecting Condition                                               Trouble Area
              2 or more switches are ON simultaneously for "N", "2", "L"and
              "R" position
              (2 trip detection logic)
                                                                              S Sh t i park/neutral position switch circuit
                                                                                Short in   k/    t l     iti   it h i it
              When driving under conditions (a) and (b) for 30 sec. or more
    P1780                                                                     S Park/neutral position switch
              the park/neutral position switch is ON (N position):
                                                                              S ECM
              (2 trip detection logic)
              (a) Vehicle speed: 80 km/h (50 mph) or more
              (b) Engine speed: 2,000  5,000 rpm

After confirming DTC P1780, use the TOYOTA hand-held tester to confirm the PNP switch signal from
Refer to DTC P1780 on page DI-189 for the WIRING DIAGRAM.

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.
Refer to DTC P1780 on DI-189 for the INSPECTION PROCEDURE.

 2002 ECHO (RM884U)

                                                                               Author :                      Date :            307

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