See Figures 1 and 2
The heart of the electronic control system which is found on vehicles covered by this information is a computer control module. Depending on the year of the vehicle, this module was called the EEC-IV Processor, Electronic Control Assembly (ECA), Electronic Control Unit (ECU) or Powertrain Control Module (PCM).
The computer control module is a microprocessor that receives data from sensors, switches, relays and other electronic components, then uses this information to control fuel supply and engine emission systems. The module contains a specific calibration for optimizing emissions, fuel economy and driveability. Based on information received and programmed into it's memory, the module generates output signals to control the fuel injection system. On the vehicles covered by this information, the computer control module is located ahead of the glove box.
Regardless of the name, all computer control modules are serviced in a similar manner. Care must be taken when handling these expensive components in order to protect them from damage. Carefully follow all instructions included with the replacement part. Avoid touching pins or connectors to prevent damage from static electricity.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- If necessary, remove the glove box or kick panel.
- Loosen the engine control sensor wiring to the computer control module connector retaining bolt. Remove the wiring connector from the module.
- Loosen the module bracket support screw, located forward of the glove compartment. Remove the bracket, then remove the computer control module.
- Installation is the reverse of the removal procedure. Tighten the module retaining screw to 24-32 inch lbs. (2.7-3.7 Nm). Tighten the engine control sensor wiring connector retaining bolt to 32 inch lbs. (3.7 Nm).