The powertrain control
module (PCM) is the control center of the vehicle. The PCM controls the following
items:
| • | The fuel metering system |
| • | The transaxle/transmission shifting |
| • | The on-board diagnostics for powertrain functions |
The PCM 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. The PCM 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. The knock sensor module is no longer
a separate component. The PCM contains integrated knock sensor (KS) diagnostic
circuitry. For more information on the integrated KS circuitry, refer to
Knock Sensor (KS) System Description
.
