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Description The electrical system provides power to the fuel pump through two relays: fuel pump and powertrain control module relays, which provide power to the fuel pump through a normally closed Inertia Fuel Shutoff switch (IFS ). The power relays are located in the powertrain control relay module, which is serviced as a unit.Operation Current path depends on operating conditions:
Normally it`s the fuel pump that`s at fault not the P.C.M. I would do some more . diognostics pryor to replacing the P.C.M. Try checking your fuel shut off switch,
Open luggage compartment door. it should be located on the left side ,Trip the reset switch and test for power once again according to the directions above,
The powertrain control module operates the fuel pump relay when the ignition switch is turned to START position to provide fuel while cranking.
PURPOSE The Electronic Engine Control (EEC) system provides optimum control of the engine and transmission through the enhanced capability of the Powertrain Control Module (PCM) . The EEC system also has an on-board diagnostics monitoring system [On Board Diagnostics II (OBD II) ] with features and functions to meet federal regulations on exhaust emissions.COMPONENTS The EEC system has two major divisions: hardware and software. The hardware includes the PCM, Constant Control Relay Module (CCRM) or Variable Load Control Module (VLCM) , sensors, switches, actuators, solenoids, and interconnecting terminals. The software in the PCM provides the strategy control for outputs (engine hardware) based on the values of the inputs to the PCM.OPERATION The PCM receives information from a variety of sensor and switch inputs. Based on the strategy and calibration stored within the memory chip, the PCM generates the appropriate output. The system is designed to minimize emissions and optimize fuel economy and driveability. The software strategy controls the basic operation of the engine and transmission, provides the OBD II strategy, controls the Malfunction Indicator Lamp (MIL) , communicates to the scan tool [New Generation STAR (NGS) , etc.] via the Data Link Connector (DLC) , allows for Flash Electrically Erasable/Programmable Read Only Memory (FEEPROM) , provides idle air and fuel trim, and controls Failure Mode Effects Management (FMEM) .