Theory Of Operation

The purpose of this diagnostic is to check the electrical and rationality performance of the transmission range sensor (TRS) circuit. The range sensor circuit is connected to the TCM by four independent circuits which distinguish between the possible shifter positions (park, reverse, neutral, and drive). The shifter position is determined based upon a 4-bit pattern (S1, S2, S3, and S4) which is described below. Two distinct fault conditions are detected by this diagnostic.