From the factory service manual, below are the steps to remove the PCM. In the diagram below, the PCM is item 7.
Removal
1. Disconnect battery ground cable (14301). Refer to «Section 14-01».
2. Remove cowl deflector.
3. Remove screw securing the ground cable of the engine control sensor wiring (12A581) to the dash panel (01610).
4. Loosen engine control sensor wiring to PCM connector retainer bolt.
5. Remove engine control sensor wiring from PCM (12A650).
6. Remove retaining nuts and powertrain control module insulator from dash panel.
7. Remove powertrain control module.