Supra L6-2997cc 3.0L DOHC MFI (1998)
Step 2
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.
DTC P1128 Throttle Control Motor Lock Malfunction
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 response 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.
DETECTING CONDITIONS