DTC P0716: Problem in Mainshaft Speed Sensor Circuit: General Description

The mainshaft speed sensor is attached to the outside of the transmission housing. The mainshaft speed sensor generates a pulsing signal according to the speed of the mainshaft idler gear on the mainshaft. Using that signal, the powertrain control module (PCM) determines the speed of the mainshaft. If no pulses occur with the mainshaft rotating, the PCM detects a malfunction that may be caused by an open, a temporary open, or a short to ground. Based on the velocity ratio measured by the countershaft speed sensor and the mainshaft speed sensor, a malfunction is detected and a DTC is stored.