CIRCUIT DESCRIPTION:The speed sensors are variable reluctance devices which convert mechanical motion to an AC voltage. Each sensor consists of a wire coil wrapped around a pole piece that is adjacent to a permanent magnet. These elements are contained in a housing which is mounted adjacent to a rotating ferrous member. Two signal wires extend from one end of the housing and an exposed end of the pole piece is located at the opposite end of the housing. The permanent magnet produces lines of flux around the pole piece. As a ferrous object (such as a gear tooth) approaches and...

CIRCUIT DESCRIPTION:The speed sensors are devices which convert mechanical motion to an electrical signal. This test detects an output speed sensor circuit short to battery, ground, or open. ACTION TAKEN WHEN THE DTC SETS:When DTC P0720 is active, the following conditions occur:1. DTC P0725 is stored in the TCM history.2. The TCM does not illuminate the CHECK TRANS light.3. If ignition is OFF, then engine speed is set to 0. If turbine shaft speed is greater than the engine speed calibration default value, then substitute turbine shaft speed as engine speed. CONDITIONS FOR CLEARING THE DTC:/CHECK TRANS LIGHTUse the diagnostic...

CIRCUIT DESCRIPTION:The speed sensors are variable reluctance devices which convert mechanical motion to an AC voltage. Each sensor consists of a wire coil wrapped around a pole piece that is adjacent to a permanent magnet. These elements are contained in a housing which is mounted adjacent to a rotating ferrous member. Two signal wires extend from one end of the housing and an exposed end of the pole piece is located at the opposite end of the housing. The permanent magnet produces lines of flux around the pole piece. As a ferrous object (such as a gear tooth) approaches and...

CIRCUIT DESCRIPTION:The speed sensors are variable reluctance devices which convert mechanical motion to an AC voltage. Each sensor consists of a wire coil wrapped around a pole piece that is adjacent to a permanent magnet. These elements are contained in a housing which is mounted adjacent to a rotating ferrous member. Two signal wires extend from one end of the housing and an exposed end of the pole piece is located at the opposite end of the housing. The permanent magnet produces lines of flux around the pole piece. As a ferrous object (such as a gear tooth) approaches and...

CIRCUIT DESCRIPTION:The TCM uses input from the turbine speed and the output speed sensors to determine the current commanded steady state gear ratio. The TCM then compares the known gear ratio to the calculated gear ratio for the current range. DTC P0729 sets during steady state condition when the calculated sixth gear ratio differs from the known sixth gear ratio for a calibrated time. ACTION TAKEN WHEN THE DTC SETS:When DTC P0729 is active, the following conditions occur:1. A shift to 5th range is made when the failure occurs.2. While diagnostic response is active, if shift selector is moved to...