Powertrain Management: Description and Operation

Powertrain Control Module Block Diagram:

The Control Module System:

CONTROL MODULE DESCRIPTION
The Powertrain Control Module (PCM) will be commonly referred to as a control module. The control module is designed to maintain exhaust emission levels to Federal or California standards while providing good driveability and fuel efficiency. It is important to review the component sections and wiring diagrams to determine which systems are controlled by each specific control module. The control module monitors numerous engine and vehicle functions and controls the following operations:

^ Fuel control.
^ Ignition Control (IC).
^ Knock Sensor (KS) system.
^ Exhaust Gas Recirculation (EGR).
^ Automatic Transmission shift functions.

MATERIAL COVERED
The performance and driveability of the modern automobile has progressed at a staggering rate. To repair and maintain these vehicles has become an ever-increasing challenge for the automotive technician. Information on the wide variety of systems and subsystems is no longer used strictly by schools or training programs, but has become an ESSENTIAL tool to properly repair todays complex vehicles. ALLDATA has organized all available information on each vehicle and provided "extra" tools to make the data easier to navigate through. Emphasis is placed on the diagnosis and repair of problems related to the particular system.