The Powertrain Control Module (PCM) performs many functions on your car. 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.
Removal & Installation
- Retrieve the module configuration. Carry out the module configuration retrieval steps of the Programmable Module Installation procedure.
- Remove the PCM wiring harness retainer nut.
- Loosen the bolt and remove the PCM connector.
- Remove the stud bolt. Position the ground cable and PCM wiring harness aside.
- Remove the 2 nuts and the PCM cover.
- Remove the PCM
- Install the PCM.
- Install the PCM cover and 2 nuts. Tighten to 62 inch. lbs. (7 Nm).
- Position back the PCM wiring harness and ground cable. Install the stud bolt and tighten to 89 inch. lbs. (10 Nm).
- Connect the PCM electrical connector and tighten the bolt to 62 inch. lbs. (7 Nm).
Install the PCM wiring harness retainer nut.
NOTEIf a new PCM is installed, the parameters must be reset in both the PCM and the instrument cluster module or the vehicle will experience a passive anti-theft system (PATS) no-start. This will occur even if the vehicle is not equipped with PATS. PATS vehicles and non-PATS vehicles have parameters in the instrument cluster module and the PCM and they both must be reset whenever a new PCM is installed.
- Restore the module configuration. Carry out the module configuration restore steps of the Programmable Module Installation procedure.
- Reprogram the passive anti-theft system (PATS). Carry out the Key Programming Using Two Programmed Keys procedure.
Scan to verify communication with PCM. If no communication, check power and grounds to the PCM.