AISIN As69RC Transmission

The Transmission Control Module (TCM) controls all electronic operations of the transmission. The TCM receives information regarding vehicle operation from both direct and indirect inputs, and selects the operational mode of the transmission. Direct inputs are hard wired to, and used specifically by the TCM. Indirect inputs are shared with the TCM via the vehicle communication bus.

Some examples of direct inputs  to the TCM are:

• Battery (B+) voltage
• Ignition "ON" voltage
• Transmission Range Sensor
• Pressure Switches
• Transmission Temperature Sensor
• Input Speed Sensor
• Output Speed Sensor

Some examples of indirect inputs  to the TCM are:

• Engine/Body Identification
• Manifold Pressure
• Throttle position
• Torque Reduction Confirmation
• Engine Coolant Temperature
• Exhaust Brake Status (if equipped)
• PTO Request (if equipped)
• Scan Tool Communication

Based on the information received from these various inputs, the TCM determines the appropriate shift schedule and shift points, depending on the present operating conditions and driver demand. This is possible through the control of various direct and indirect outputs.

Some examples of TCM direct outputs  are:

• Exhaust Brake Cut Request (if equipped).
• Solenoids.
• Torque Reduction Request.

Some examples of TCM.indirect outputs  are:

• Transmission Temperature (to PCM).
• PRNDL Position (to cluster/CCN).
• PTO Status.

In addition to monitoring inputs and controlling outputs, the TCM has other important responsibilities and functions:

• Storing and maintaining Clutch Volume Indexes (CVI).
• Storing and selecting appropriate Shift Schedules.
• System self-diagnostics.
• Diagnostic capabilities (with scan tool).

Clutch filling time is continuously maintained when the vehicle is running.