On-Board Diagnostic System

AUTOMATIC TRANSMISSION ELECTRONIC CONTROL SYSTEM

Electronic System Description

The powertrain control module (PCM) and its input/output network control the following transmission operations:

- adaptive controls (model dependent)
- shift timing
- line pressure (shift feel)
- torque converter clutch (TCC)
The transmission control is separate from the engine control strategy in the PCM, although some of the input signals are shared. When determining the best operating strategy for transmission operation, the PCM uses input information from certain engine-related and driver-demand related sensors and switches.
In addition, the PCM receives input signals from certain transmission-related sensors and switches. The PCM also uses these signals when determining transmission operating strategy.
Using all of these input signals, the PCM can determine when the time and conditions are right for a shift, or when to apply or release the torque converter clutch. It will also determine the best line pressure needed to optimize shift feel. To accomplish this the PCM uses six output solenoids to control transmission operation.

Electronic Control Components