Engine and Emission Devices

What are the engine/emission controls most likely found on a 91 Ranger? I personally call any device attached under my hood an engine device, while technically wrong, does it really matter? If they go bad, my engine suffers. Check your emission label under the hood.

These devices can further be divided into Input (sensor or devices that PROVIDE information, usually to the brain) or output (devices that change some other setting, device or manipulative some linkage or device).

They are as follows:

1. The battery.
2. The ACT (Air Charge Temperature Sensor).
3. The ECA (Electronic Control Assembly)
4. The ECT (Engine Coolant Sensor)
5. The EGR (Exhaust Gas Recirculation Valve)
6. The EVP (EGR Valve Position Sensor)
7. The MAP (Manifold Absolute Pressure Sensor)
8. The EGO (Exhaust Gas Oxygen Sensor)
9. The TPS (Throttle Position Sensor)
10. The EEC
11. The CANP (Canister Purge Soloniod)
12. The ISC (Idle Speed Control)
13. The TAB (Thermactor Air By-pass)
14. The TAD (Thermactor Air Diverter)
15. The TFI-IV (Ignition control module)
16. The EEC Power Relay
17. The A/C and Cooling fan controller module
18. The EEC-IV (Engine Management System)(the "brain")