Circuit Description

Throttle valve opening angle is detected by the Throttle Position (TP) sensor and sends a signal to the ECM. The ECM then uses this signal to control the throttle control motor which opens and closes throttle valve in response to driving conditions. If DTC P1129 is present, ECM turns off power to the throttle motor and magnetic clutch and throttle valve is fully closed by the return spring. When this occurs, opening angle of throttle valve can be controlled by accelerator pedal by means of the throttle cable. DTC is set when throttle opening angle varies greatly from target throttle opening angle. Possible causes are:

• Open or short in throttle control motor circuit.
• Throttle body.
• ECM.