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 MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 62 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC-IV (3.8L))
1991 Mercury Tracer Base, 4D Sedan, Automatic
Section 62 (Engine Controls - System/Component Tests - EEC-IV (3.8L))
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Section 62 (Engine Controls - System/Component Tests - EEC-IV (3.8L))
WARNING: This page is about a different car, the 1994 Mercury Sable, 1994 Mercury Cougar, 1994 Lincoln Continental, 1994 Ford Thunderbird, and 1994 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
- 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.