Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Control Module: Description and Operation
1996 Ford Aerostar 2WD V6-182 3.0LSECTION Description and Operation
Powertrain Control Module (PCM):
The 104-pin Powertrain Control Module (PCM) for the EEC-V system is used to adjust air fuel mixture, spark advance, and exhaust gas recirculation.
The EEC-V systems use Sequential Multiport Fuel Injection (SFI).
WARNING: Do not smoke, carry lighted tobacco, or open flame of any type when working on or near any fuel related component. Highly flammable mixtures are always present and may be ignited, resulting in possible personal injury.
Typical Vehicle Emission Control Information (VECI) Decal:
To maintain the required exhaust emission levels, the fuel metering system must be kept in proper operating condition and adjusted to the specifications listed on, for example, the Vehicle Emission Control Information (VECI) decal.
Additional engine performance checks are required to keep the exhaust emissions at the specified minimum pollutant level.
With the preprogrammed performance data and the information from vehicle sensors, the PCM develops an adaptive strategy for operating the ignition, fuel, and EGR systems. The PCM will also adjust the electronically controlled automatic transmission if equipped.
This adaptive strategy is maintained in the PCM memory by a small amount of current from the vehicle's battery when the ignition is OFF.
NOTE: When battery voltage is removed from the PCM, all learned values will be cleared and reset to predetermined values. When battery voltage is restored to the PCM, the vehicle may exhibit certain driveability concerns. It will be necessary to drive the vehicle to allow the PCM to relearn values for optimum driveability and performance.
The PCM receives data from various sensors:
- Throttle Position (TP) sensor
- Mass Air Flow (MAF) sensor
- Intake Air Temperature (IAT) sensor
- Engine Coolant Temperature (ECT) sensor
- Heated Oxygen Sensors (HO2S)
- Camshaft Position (CMP) sensor
- Crankshaft Position (CMP) sensor
- Power Steering Pressure (PSP) switch
The EEC-V PCM contains specific calibrations for optimizing emissions controls, fuel economy, and driveability. Based on information received and programmed into its memory, the PCM sends signals to control:
- Fuel injector
- Ignition coil
- Idle Air Control (IAC) valve
- EGR vacuum regulator solenoid
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.