DTC P1530: Throttle Control System - Amplifier Adjustment: Description

The Throttle Actuator Control (TAC) module contains 2 throttle position sensors with a common 5-volt supply, a common ground, and 2 independent signal circuits that vary resistance according to changes in throttle plate position. The ECM measures the signal voltage from each TP sensor, which is a reduced value of the ECM 5-volt reference. The ECM reads the voltage levels from TP sensor 1, then converts the voltage level to a binary number. This binary number is limited to 0.019 volts/bit based on the range of 5 volts. At low throttle angle, the ECM needs to amplify the TP sensor No. 1 signal in order to obtain a more accurate binary number equivalent for very slight changes in throttle angle. The ECM will monitor the TP sensor No. 1 amplification output whenever a key-up closed throttle test is performed (once per key-up). DTC P1530 will set if the TP sensor No. 1 amplification output does not correlate with the TP sensor No. 1 signal voltage.