For 1990-2009 cars only
The Powertrain Control Module (PCM) is the control center of the vehicle. It controls the following items:
| • | Fuel metering system. |
| • | Transaxle/transmission shifting. |
| • | Ignition timing. |
| • | On-board diagnostics for powertrain functions. |
It constantly looks at the information from various sensors, and controls the systems that affect vehicle performance. The PCM also performs the diagnostic function of the system. It can recognize operational problems, alert the driver through the MIL, and store diagnostic trouble codes which identify the problem areas to aid the technician in making repairs.
The type of PCM used is a PCM 32U. For service, the PCM consists of two parts: a controller (the PCM without the Knock Sensor module) and the Knock Sensor module.
