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Home >> Saturn >> 2007 >> Ion Red Line >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - DTC P0123 To DTC P0327 >> DTC P0123 >> Circuit Description

Circuit Description

The throttle position (TP) sensors 1 and 2 are located within the throttle body assembly. Each sensor has the following circuits:

This provides the powertrain control module (PCM) with a signal voltage proportional to the throttle plate movement. The TP sensor 1 signal voltage at closed throttle is near the 5-volt reference circuit and decreases as the throttle plate is opened. The TP sensor 2 signal voltage at closed throttle is near the low reference circuit and increases as the throttle plate is opened. If the PCM detects that the TP sensor 1 signal voltage is more than the predicted range, DTC P0123 sets.

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