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 42 (ENGINE CONTROLS - TESTS W/CODES - EEC-V (4.6L))
1991 Mercury Tracer Base, 4D Sedan, Automatic
Section 42 (Engine Controls - Tests W/Codes - EEC-V (4.6L))
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Section 42 (Engine Controls - Tests W/Codes - EEC-V (4.6L))
WARNING: This page is about a different car, the 1994 Mercury Cougar and 1994 Ford Thunderbird. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Self-Diagnostic System
- Quick Test
- Additional System Functions
- Diagnostic Trouble Code (DTC) Definition Charts
- Service Code-To-Test Reference Menus
- Circuit Tests
- Notes
- How To Use Circuit Tests
- Circuit Test A - No Start Vehicle Will Not Start
- Circuit Test C - Reference Voltage
- Circuit Test DA - Temperature Sensor Test (IAT & ECT)
- Circuit Test Dc - Mass Airflow (MAF) Sensor
- Circuit Test DH - Throttle Position (TP) Sensor
- Circuit Test DP - Vehicle Speed Sensor (VSS)
- Circuit Test Dr - Cylinder Identification (CID) Circuit
- Circuit Test FD - Brake On-Off (Boo) Switch
- Circuit Test FG - Octane Adjust
- Circuit Test H - Fuel Control
- Circuit Test HB - Adaptive Fuel Strategy
- Circuit Test HC - Fuel Delivery System
- Circuit Test Hd - Misfire Monitor
- Circuit Test He - EGR System
- Circuit Test Hf - Catalyst Efficiency Monitor & Exhaust Systems
- Circuit Test Hg - PCV System
- Circuit Test HU - Air Intake & Throttle Body
- Circuit Test HV - Evaporative Emission System
- Circuit Test Ja - Ignition No-Start
- Circuit Test JB - Ignition Misfire Under Load
- Circuit Test JC - Ignition Coil Failure
- Circuit Test KE - Idle Air Control (IAC) Valve
- CKT Test MB - Output State Diag Test Mode Not Functioning
- Circuit Test MC - Spark Output Check
- Circuit Test NA - Ignition Diagnostic Monitor (IDM)
- Circuit Test NB - Malfunction Indicator Light (Mil)
- CKT Test QA - Unable To Activate Self-Test/SCP Communication
- Circuit Test QB - Diagnostic Trouble Code P1605
- Circuit Test QC - Diagnostic Trouble Code P1000
- Circuit Test Tb - TCS/TCIL
- Circuit Test TC - Transmission Solenoids
- Circuit Test TD - Manual Lever Position (MLP) Sensor
- Circuit Test Te - Transmission Fluid Temperature (TFT) Sensor
- Circuit Test TF - Output Shaft Speed (OSS) Sensor
- Circuit Test TG - Elect Transmission Continuous Memory DTC
- Circuit Test X - Constant Control Relay Module (CCRM)
- Circuit Test Z - Intermittent
- Summary
- 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.