Control Module: Description and Operation

PURPOSE
The transaxle control module calculates transmission speed and gear ratio based upon input signals from pulse generators A and B. The transaxle control module controls the torque converter damper clutch on the KM-175 transaxle based on the input operating conditions.

OPERATION
To prevent driveability problems, the transmission control module turns the damper clutch OFF under the following conditions:
1. First and reverse gears- To secure quick acceleration at start
2. Below approximately 800 RPM- To secure easy start
3. Large throttle opening at engine speeds of 2,000 RPM or less- To secure quick acceleration
4. Engine braking- To prevent deceleration shock
5. 3-2 downshift- To secure shift feeling
6. Engine coolant temperature below 122°F (50°C)

If all operating conditions are correct, the transaxle control module switches a signal ON to the damper clutch control solenoid valve to engage the torque converter clutch.