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.
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HOMESERVICE MANUALSMERCURY1994COUGAR 3.8 4, 4R70WREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC-IV (3.8L)
1994 Mercury Cougar 3.8 4, 4R70W
Engine Controls - System/Component Tests - EEC-IV (3.8L)
1994 Mercury Cougar 3.8 4, 4R70WSECTION Engine Controls - System/Component Tests - EEC-IV (3.8L)
- Introduction
- Air Induction Systems
- Computerized Engine Controls
- Engine Sensors & Switches
- Notes
- A/C Cutout
- Barometric Pressure (BARO) Sensor
- Cylinder Identification (CID)
- Engine Coolant Temperature (ECT) Sensor
- EGR Atmospheric (EGRA) Solenoid
- EGR Position (EGRP) Sensor
- EGR Vacuum Regulator (EVR) Solenoid
- EGR Vacuum (EGRV) Solenoid
- EGR Valve Position (EVP) Sensor
- Heated Gas Oxygen Sensor (Ho2S)
- Inertia Fuel Shutoff (Ifs) Switch
- Intake Air Temperature (IAT) Sensor
- Knock Sensor (KS)
- Mass Airflow (MAF) Sensor
- Power Steering Pressure Switch (PSPS)
- Pressure Feedback (PFE) EGR Sensor & Diff PFE (DPFE) Sensor
- Throttle Position (TP) Sensor
- Vehicle Speed Sensor (VSS)
- Modules, Relays & Solenoids
- Fuel Systems
- Idle Control System
- Ignition System
- Notes
- Di System
- Pinpoint Test A: No Start Distributor Mounted ICM
- Pinpoint Test Aa: No Start Remote Mounted ICM
- Pinpoint Test AAA: No Start With Spout Connector Disconnected
- Pinpoint Test B: Continuous Memory Code 212
- Pinpoint Test C KOER Code 213: Timing Incorrect, Spout Open,
- Pinpoint Test A - No-Start
- Pinpoint Test B: Code 212 IDM Low, CMP CKT Open Or Erratic
- Pinpoint Test C: Code 214 CID To Pcm Failure
- Pinpoint Test D: Code 215, 216 Or 217 Coil 1, 2 Or 3 Failure
- Pinpoint Test E: Code 213 Spout Circuit Shorted Or Open
- Pinpoint Test F - Misfire Under Load
- Pinpoint Test G - No Codes-Intermittent Diagnosis
- EI System (High Data Rate) - SC, Cougar (CALIF.) &
- Pinpoint Test A: No Start
- Pinpoint Test B: Code 212 Or 226 IDM Failure
- Pinpoint Test C: Code 213 Or Lack Of PWR Or Poor Fuel Economy
- Pinpoint Test D: Code 215, 216, 217 Or 232 Coil 1, 2 Or 3
- Emission Systems & Sub-Systems
- Wiring Diagrams
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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.