Stealth R/T V6-2972cc 3.0L DOHC (1991)
Powertrain Control Module: Description and Operation
Engine Control Unit (ECU) Location
The electronic control unit (ECU) consists of an 8-bit microprocessor, random access memory (RAM). The ECU actively controls the operation of the
fuel injection system, the ignition timing, and has full control of the idle speed control system. The ECU also interrupts the operation of the air
conditioning and EGR systems under some conditions, and controls the power to the fuel pump (through the power relay). Based on the information
from an array of input sensors (eng. coolant, barometric press., air flow etc.), the ECU determines the optimum control and drives the output actuators
accordingly. In addition to this the electronic control unit monitors the input/output signals. When it is noticed that an irregularity has occurred, the
ECU memorizes the trouble code, and makes it available to the self-diagnosis output terminal. The diagnosis results can be read out with a voltmeter or
multi-use tester. Moreover, since memorization of the trouble codes is backed up directly by the battery, the diagnosis results are held in memory even
if the ignition key is turned off (except for the oxygen sensor code). The trouble codes will, however, be erased when the battery terminal or the engine
control unit connector is disconnected.
