For 1990-2009 cars

The Powertrain Control Module (PCM), located behind the right side of the instrument panel, behind the convenience center. It controls the following:

• | Fuel metering system.

• | Transaxle 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. Refer to Introduction, for more information on using the diagnostic function of the PCM.

VIN E RPO LA1 engines use 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.