Section 10 (EEC-IV Theory/Operation)
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 1989 Mercury Topaz, 1989 Mercury Sable, 1989 Mercury Grand Marquis, 1989 Mercury Cougar, and 1989 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
- Description
- Operation
- Notes
- ECA Input Sensors
- A/C Compressor Clutch Signal
- Air Charge Temperature (ACT) Sensor (All Engines Except 1.9L MPFI)
- Barometric Pressure (BP) Sensor (1.9 MPFI, 3.0L SHO, 3.8L SC SEFI & 5.0L MA SEFI)
- Brake On/Off (BOO) Switch (2.3L OHC MPFI, 2.5L CFI, 3.0L MPFI, 3.0L SHO SEFI, 3.8L SEFI, 3.8L SC SEFI & 5.0L SEFI)
- EEC Power Relay (1.9L CFI, 1.9L MPFI, 2.3L MPFI, 3.8L SEFI (RWD) & 5.0L SEFI)
- EGR Valve Position (EVP) Sensor (2.3L OHC MPFI, 2.5L CFI, 5.0L SEFI & 5.0L SEFI (MA)
- Engine Coolant Temperature (ECT) Sensor (All Engines)
- Idle Tracking Switch (ITS) (1.9L CFI & 2.5L CFI)
- Knock Sensor (2.3L OHC MPFI, 3.0L MPFI, 3.0L SHO SEFI & 3.8L SC SEFI)
- Manifold Absolute Pressure (MAP) Sensor (1.9L CFI, 2.3L OHC MPFI, 2.3L HSC MPFI, 2.5L CFI, 3.0L MPFI, 3.8L SEFI & 5.0L SEFI)
- Mass Airflow (MAF) Sensor (5.0L MA SEFI)
- Neutral Drive Switch (NDS) & Neutral Gear Switch (NGS)
- Heated Oxygen (HEGO) Sensor (All Engines)
- Profile Ignition Pick-Up (PIP) (All Engines)
- Power Steering Pressure Switch (PSPS) (2.3L OHC MPFI, 2.3L HSC MPFI, 2.5L CFI, 3.0L MPFI & 3.0L SHO SEFI)
- Pressure Feedback Electronic (PFE) EGR Valve (1.9L CFI, 2.3L HSC MPFI, 3.0L MPFI, 3.0L SHO SEFI, 3.8L MPFI & 3.8L SC SEFI)
- Self-Test Input (STI) (All Engines)
- Throttle Position (TP) Sensor (All Engines)
- Vane Airflow (VAF) Meter (1.9L MPFI)
- Vane Air Temperature (VAT)
- Vehicle Speed Sensor (VSS)
- ECA Output Controlled Components
- Notes
- Canister Purge Solenoid (CANP) (All Except 2.3L OHC MPFI)
- EGR Control (EGRC) Solenoid (2.3L OHC MPFI)
- EGR Shut-Off (EGRSO) Solenoid (1.9L MPFI)
- EGR Vent (EGRV) Solenoid (2.3L OHC MPFI)
- EGR Vacuum Regulator (EVR) (All Engines Except 1.9L MPFI & 2.3L OHC MPFI)
- Fuel Injectors (All Engines)
- Fuel Pump Relay (All Engines)
- Idle Speed Control (ISC) Motor (1.9L CFI & 2.5L CFI)
- Idle Speed Control By-Pass Air (All Engines Except 1.9L CFI & 2.5L CFI)
- Integrated Relay Controller Module (IRCM) (2.5L CFI, 3.0L MPFI, 3.0L SHO SEFI, 3.8L FWD SEFI & 3.8L SC SEFI)
- Self-Test Output (STO) (All Engines)
- Shift Indicator Light (SIL) (1.9L CFI, 1.9L MPFI, 2.3L HSC MPFI, 2.5L CFI (M/T) & 3.8L SC SEFI)
- Spark Output (SPOUT) (All Engines)
- Thermactor Air By-Pass (TAB) Solenoid (5.0L SEFI)
- Thermactor Air Diverter (TAD) Solenoid (5.0L SEFI)