Circuit Description

Throttle Position (TP) sensor is located on throttle body and delivers input signals to Engine Control Module (ECM) in proportion to throttle opening. ECM uses input signal and controls the throttle control motor to provide proper throttle valve opening in response to driving conditions. DTC is set when ECM detects throttle control motor becomes locked. If DTC P1128 exists, ECM will turn off the power to throttle control motor and throttle valve is closed by the return spring. When this occurs, throttle valve is controlled by throttle cable connected to accelerator pedal. Possible causes are defective throttle control motor or throttle body.