Technician Handbook ! 673 Electronic & Computer Controlled Systems Differences in Self- In this throttle position sensor circuit, the electronics inside the ECM are arranged slightly differently. In this arrangement, a short to ground on a VTA line causes the monitored voltage to go to 0V. An open in a VTA line, however, causes the monitored voltage to go to 5V. Diagnosis (Cont’d) Thus, this ECM can distinguish between an open or short on an input circuit and can set a DTC for one or the other. The additional data supplied by the ECM makes it easier and faster to diagnose and correct the problem. 18 Technical Training