Transmission Position Sensor/Switch: Description and Operation

DESCRIPTION
The [1][2]inhibitor switch assures safety when starting the engine. This switch is mounted on the right side of the transmission case, and is operated by the range selector lever.


OPERATION



When the selector lever is set to "P" or "N", the electrical circuit is connected in the [1][2]inhibitor switch and the starter circuit is energized for cranking the engine.

When the selector lever is set to "R", "D", "3", "2", or "1" range, the electrical circuit is disconnected in the [1][2]inhibitor switch. Hence engine cranking is disabled. In the "R" range, the backup light circuit is completed in the switch, and the backup lights come on.

The [1][2]inhibitor switch allows the back-up lights to turn on when the selector lever is in the R range and the starter motor to start when the lever is in the N or P range. It also monitors the input signal electronically controlled for each range and turns on the corresponding range light on the instrument panel.

When light operation, driving condition or starter motor operation is erroneous, first check the shift linkage for improper operation. If the shift linkage is functioning properly, check the [1][2]inhibitor switch.

In addition to the above function, the [1][2]inhibitor switch incorporates a circuit for detecting the selected range position and sending the range signal to the TCM.