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 74 (ENGINE CONTROLS - SENSOR OPERATING RANGE CHARTS)INTRODUCTION

1991 Mercury Tracer Base, 4D Sedan, Automatic

Section 74 (Engine Controls - Sensor Operating Range Charts): Introduction

1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Introduction

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1994 Mercury Tracer, 1994 Mercury Topaz, 1994 Mercury Sable, 1994 Mercury Grand Marquis, and 1994 Mercury Cougar. However, it is still accessible from the selected car via links, so may be relevant.

Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems. To determine correct engine control system, see SYSTEM APPLICATION table.

SYSTEM APPLICATION

Application	System
1.8L & 2.5L	EEC
Cougar 4.6L, Mustang 3.8L & Thunderbird 4.6L	EEC-V
All Others	EEC-IV

NOTE: Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. For sensor testing procedures, see appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE section below.

TESTS W/CODES - EEC 1.8L (for Escort & Tracer)
TESTS W/CODES - EEC-IV (1.9L) (for Escort & Tracer)
TESTS W/CODES - EEC-IV (2.0L) (for Probe)
TESTS W/CODES - EEC-IV (2.3L) (for Tempo & Topaz)
TESTS W/CODES - EEC 2.5L (for Probe)
TESTS W/CODES - EEC-IV (3.0L) (for Sable, Taurus, Tempo & Topaz)
TESTS W/CODES - EEC-IV (3.2L SHO) (for Taurus)
TESTS W/CODES - EEC-IV (3.8L) (for Continental, Cougar, Mustang, Sable, Taurus & Thunderbird)
TESTS W/CODES - EEC-V (3.8L) (for Mustang)
TESTS W/CODES - EEC-V (4.6L) (for Cougar & Thunderbird)
TESTS W/CODES - EEC-IV (4.6L) (all other 4.6L)
TESTS W/CODES - EEC-IV (5.0L) (for Mustang)

RENDER: 1.0x

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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.