Trans Range Sensor (TRS)
The Trans Range Sensor (TRS) provides data to the Transmission Control Module (TCM) and other ECUs about the gear range that has been selected by the operator. The TRS also indicates from which direction the range selector was moved to obtain the current gear position. The accompanying table provides an overview of how the sensor sends Closed (1) or Open (0) signals to indicate the range the gear selector just left and the current position the gear selector is in. The TRS also functions as a neutral safety switch to inhibit the starter if the transaxle is not in Park or Neutral. The TRS also functions as a reverse lamp switch and will signal the Body Control Module (BCM) to turn on the back-up lamps when the transaxle is shifted into reverse.
| S4 | S3 | S2 | S1 | |
| P | 0 | 0 | 0 | 1 |
| pr | 0 | 0 | 1 | 1 |
| R | 0 | 0 | 1 | 0 |
| rn | 0 | 1 | 1 | 0 |
| N | 0 | 1 | 0 | 0 |
| nd | 1 | 1 | 0 | 0 |
| D | 1 | 0 | 0 | 0 |
| d3 | 1 | 1 | 1 | 1 |
Continuity Test
Using a suitable continuity tester or OHM meter test for continuity from pin 3 to each of the signal Pins as the sensor is cycled to each shift position.
| 1 = S5 (Signal, Pst, Nst) |
| 2 = Power (12v, Pst, Nst) |
| 3 = Power (12v) |
| 4= S2 (Signal R) |
| 5 = NC |
| 6 = NC |
| 7 = S3 (Signal N) |
| 8= S1 (Signal P) |
| 9 = S4 (Signal D) |