Description & Operation: Notes
Input signals from sensors are sent to the Powertrain Control Module (PCM). The PCM can determine when the time and conditions are right for a shift or converter clutch application. The PCM can also determine line pressure needed to optimize shift feel.
Five electronic solenoids accomplish these functions; 3 On/Off solenoids for shifting, 1 Pulse-Width Modulator solenoid for torque converter clutch control and Electronic Pressure Control (EPC) solenoid for line pressure control. The PCM has built-in self-diagnosis, fail-safe code and warning code display for the main input sensors and solenoid valves.
NOTE:
In addition to transmission fault codes, engine-related fault codes may be output during QUICK TEST procedure. These fault codes pertain to engine performance and must be repaired first as engine performance will greatly affect transmission operation. For information and testing procedures of engine-related fault codes and components, see TESTS W/CODES
- EEC-IV article in the ENGINE PERFORMANCE section.