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DI-144
                                                   DIAGNOSTICS        -    ENGINE (5VZ-FE)
                                                                                                                                    DI0SH-08




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

CIRCUIT DESCRIPTION
The park/neutral position switch go 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 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 P, R, N, D, 2
              and L position (2 trip detection logic)
             When driving under conditions (a) and (b) for 30 sec. or more        S Short in park/neutral position switch circuit
    P1780    park/neutral position switch is ON (N position): (2 trip detection   S Park/neutral position switch
             logic)                                                               S ECM
             (a) Vehicle speed: 70 km/h (44 mph) or more
             (b) Engine speed: 1,500 - 2,500 rpm

HINT:
After confirming DTC P1780, use the TOYOTA hand-held tester to confirm the PNP switch signal from the
CURRENT DATA.

WIRING DIAGRAM
Refer to DTC P1780 on page DI-203 .

INSPECTION PROCEDURE
Refer to DTC P1780 on page DI-203 .
HINT:
Read freeze frame data using the 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 deter-
mining 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.




 2002 4RUNNER (RM887U)

                                                                                     Author :                      Date :             320

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