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 cip1128

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DI-120
                                                     DIAGNOSTICS        -    ENGINE (5VZ-FE)
                                                                                                                             DI8XM-01




    DTC                  P1128                Throttle Control Motor Lock Malfunction

CIRCUIT DESCRIPTION
Throttle motor is operated by the ECM and it opens and closes the throttle valve. The opening angle of the
throttle valve is detected by the throttle position sensor which is mounted on the throttle body and it provides
feedback to the ECM to control the throttle motor in order the throttle valve opening angle properly in re-
sponse to driving condition. If this DTC is stored, 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
                                                                                   S Throttle control motor
    P1128      Lock throttle control motor during control throttle control motor
                                                                                   S Throttle body


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.

   1        Check throttle control motor (See page DI-1 13).


                                                                NG          Replace throttle control motor
                                                                            (See page SF-32 ).


   OK



   2        Visualy check throttle valve.

PREPARATION:
Remove the intake air connector.
CHECK:
Check whether or not a foreign body is caught between the throttle valve and the housing.


                                                                NG          Remove a foreign body and clean throttle body.


   OK



  Replace throttle body.

 2002 4RUNNER (RM887U)

                                                                                      Author :                     Date :      296

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