Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne di eg5vzfe cip1129

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                                                                                                                          DI-121
                                                  DIAGNOSTICS        -     ENGINE (5VZ-FE)
                                                                                                                           DI1M6-10




    DTC                 P1129               Electric Throttle Control System Malfunction

CIRCUIT DESCRIPTION
Electric Throttle Control System (ETCS) is composed of the throttle motor to operate the throttle valve, the
electromagnetic clutch to connect the throttle motor with the throttle valve, the throttle position sensor to de-
tect the opening angle of the throttle valve, the accelerator pedal position sensor to detect the accelerator
pedal position, the ECM to control the ETCS and the one valve type throttle body.
The ECM controls the throttle motor to make the throttle valve opening angle properly in response driving
condition.
The throttle position sensor which is mounted on the throttle body detects the opening angle of the throttle
valve, and it provides feedback to the ECM to control the throttle motor.
If the ETCS has a malfunction, the ECM shuts down the power for the throttle motor and the magnetic clutch,
and the throttle valve is fully closed by the return spring.
However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the
throttle cable.
   DTC No.                       DTC Detecting Condition                                                   Trouble Area
              Throttle opening angle continues to vary great from target        S Electric throttle control system
    P1129
              throttle opening angle                                            S ECM


WIRING DIAGRAM
Refer to DTC P1125 on page DI-1 13.

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.

  Replace ECM, and clear DTC. If DTC P1129 is memorized again, and then replace throttle body.




 2002 4RUNNER (RM887U)

                                                                                 Author :                       Date :     297

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