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.
1990 Ford Tempo BaseFACTORY OEM SERVICE PROCEDURE
Engine Controls - System/Component Tests - EEC-IV
- Introduction
- Supercharger Check
- Turbocharger Check
- Variable Induction Systems Check
- Engine Control Unit (Ecu) Tests
- Air Charge Temperature (Act) Sensor Test
- Barometric Pressure Sensor Test (2.2L Probe)
- Crankshaft Position Sensor (Cps) Test
- Cylinder Id Sensors Test (2.2L Probe Turbo Only)
- Engine Coolant Temperature (ECT) Sensor Test
- EVP Sensor Test (2.2L Probe CALIF. Only)
- Heated Gas Oxygen (HEGO) Sensor Test
- Inertia Switch Test
- Knock Sensor Test (Except 2.2L Probe Turbo)
- Knock Sensor Test (2.2L Probe Turbo)
- Map/BP Sensor Test
- Mass Airflow (Ma) Sensor Test
- Neutral Drive Switch (NDS) A/C Input Test
- Power Steering Pressure Switch (PSPS) Test
- Throttle Position Sensor Test (2.2L Probe)
- TCS Sensor Test (2.2L Probe)
- Vat Sensor Test (2.2L Probe)
- Vane Air Flow Meter Test (2.2L Probe)
- Vehicle Speed Sensor (VSS) Test
- Relay Tests
- Solenoid Tests
- Ignition Module Tests
- Fuel System Tests
- Fuel Control Tests
- Idle Control System Tests
- Electric Choke Tests (5.8L V8 MCU)
- Ignition System Checks
- Timing Control Systems Tests
- Emissions/Sub-Systems Checks - Air Injection
- Air Supply Pump
- Air Silencer/Filter (Air Pump And Pulse Air Inlet)
- Air Bypass Valve (Normally Closed)
- Air Check Valve
- Air Supply Control Valve
- Air Control Valve (Switch-Relief)
- Air Pump Resonator
- Combination Air By-Pass/Air Control Valve
- Dual THERMACTOR Air Control Solenoid Valve
- Solenoid Vacuum Valve Assembly
- THERMACTOR Idle Vacuum (TIV) Valve
- Vacuum Control Valve (VCV)
- Electrical Vacuum Control Valve
- Vacuum Check Valve
- Vacuum Reservoir
- Pulse Air Valve
- Emissions/Sub-Systems Checks - EGR Systems
- Emissions/Sub-Systems Checks - Fuel Evaporation
- Emissions/Sub-Systems Checks - PCV Systems
- Emissions/Sub-Systems Checks - TAC Systems
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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