The Powertrain Control Module (PCM) performs many functions on your vehicle. The module accepts information from various engine sensors and computes the required fuel flow rate necessary to maintain the correct amount of air/fuel ratio throughout the entire engine operational range.
Based on the information that is received and programmed into the PCM's memory, the PCM generates output signals to control relays, actuators and solenoids. The PCM also sends out a command to the fuel injectors that meters the appropriate quantity of fuel. The module automatically senses and compensates for any changes in altitude when driving your vehicle.
The PCM is located behind the passenger's side of the firewall.
REMOVAL & INSTALLATION
See Figures 1 and 2
When the battery has been disconnected, some abnormal driving symptoms may occur while the PCM relearns its fuel trim. The vehicle may need to be driven 10 miles (16 km) or more to relearn the fuel trim.
- Disconnect the negative battery cable.
- Remove the cowl top vent panel.
- Loosen the engine control sensor wiring to PCM connector retaining bolt.
- Remove the engine control sensor wiring connector form the PCM.
- Remove the PCM cover nuts.
- Remove PCM cover.
- Pull the PCM out of the bracket.
- Position the PCM in the bracket.
- Install PCM cover and tighten nuts to 35-49 inch lbs. (4-7 Nm).
- Install the engine control sensor wiring connector and tighten the bolt to 32 inch lbs. (4 Nm).
- Install the cowl top vent panel.
- Connect the negative battery cable.