Theory Of Operation

The purpose of this diagnostic is to check the rationality between the input speed sensor and the output speed sensor. Transmission input speed should be synchronized with output speed. The calculated input speed is determined by multiplying the output speed sensor signal and the gear ratio for each gear. The malfunction conditions which can cause a difference between the calculated and measured input speeds include input speed sensor failures, output speed sensor failures, solenoid failures, hydraulic system failures, gear failures, and clutch failures.