The Powertrain Control Module (PCM) constantly looks at the information from various sensors and other inputs and controls systems that affect vehicle performance and emissions. The PCM also performs diagnostic tests on various parts of the system. The PCM can recognize operational problems and alert the driver via the malfunction indicator lamp (MIL). When the PCM detects a malfunction, the PCM stores a diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. The input and output devices in the PCM include analog-to-digital converters, signal buffers, counters, and output drivers. The output drivers are electronic switches that complete a ground or voltage circuit when turned on. Most PCM controlled components are operated via output drivers. The PCM monitors these driver circuits for proper operation and, in most cases, can set a DTC corresponding to the controlled device if a problem is detected.
Removal & Installation
- Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.
- Disconnect the negative battery cable.
- Remove the left sheet metal diagonal brace.
- Remove the air cleaner assembly cover and lift the PCM from the air cleaner assembly.
- Disconnect the engine harness electrical connectors from the PCM.
- Remove the PCM.
- Install the PCM electrical connectors.
- Install the PCM into the air cleaner assembly.
- Install the air cleaner assembly cover.
- Install the left sheet metal diagonal brace.
- Connect the negative battery cable.
- Reprogram the PCM if a new PCM was installed.