Theory Of Operation

The transmission system uses two speed sensors, one to measure input shaft speed and one to measure output shaft speed. These speed signal inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks:

• When in gear, if the gear ratio does not match a known gear ratio, the corresponding in-gear DTCs P0731-36 and P1736 is set.
• An excessive change in input or output speeds indicating an intermittent signal which results in DTCs P0716 and/or P0721 setting.
• If the common speed sensor ground circuit is lost, both sensor inputs will read the signal from the input speed sensor at idle in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear the result is an apparent speed ratio of 1:2 and may cause DTC P1794 to set when at a stop.