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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 91 (ENGINE CONTROLS - TESTS W/CODES - EEC-V (4.6L))
1991 Mercury Tracer Base, 4D Sedan, Automatic
Section 91 (Engine Controls - Tests W/Codes - EEC-V (4.6L))
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Section 91 (Engine Controls - Tests W/Codes - EEC-V (4.6L))
WARNING: This page is about a different car, the 1995 Mercury Grand Marquis, 1995 Mercury Cougar, 1995 Lincoln Town Car, 1995 Ford Thunderbird, and 1995 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Self-Diagnostic System
- Quick Test
- Additional System Functions
- Notes
- Generic OBD-II Parameter Identification (PID)
- Non-Generic OBD-II Parameter Identification (PID)
- On-Board System Readiness (OSR) Test Mode
- Freeze Frame Data Mode
- Oxygen Sensor Test Mode
- Output Test Mode
- Failure Mode Effects Management (FMEM)
- Hardware Limited Operational Strategy (HLOS)
- Trips & Drive Cycles
- Summary
- Diagnostic Trouble Code (DTC) Definition Charts
- Diagnostic Trouble Code (DTC) Reference Charts
- Circuit Tests
- Notes
- How To Use Circuit Tests
- Circuit Test A - No Start Vehicle Will Not Start
- Circuit Test B - EEC-V Power Relay
- Circuit Test C - Reference Voltage
- Circuit Test DA - Temperature Sensor Test (IAT & ECT)
- Circuit Test Dc - Mass Airflow (MAF) Sensor
- Circuit Test Dg - Knock Sensor (KS)
- Circuit Test DH - Throttle Position (TP) Sensor
- Circuit Test DP - Vehicle Speed Sensor (VSS)
- Circuit Test Dr - Cylinder Identification (CID) Circuit
- Circuit Test DS - Air Conditioning Pressure (ACP) Sensor
- Circuit Test FD - Brake On-Off (Boo) Switch
- Circuit Test Ff - Power Steering Pressure (PSP) Switch
- Circuit Test FG - Octane Adjust
- Circuit Test H - Fuel Control
- 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 Ht - Traction Assist (Ta) System
- Circuit Test HU - Air Intake & Throttle Body
- Circuit Test HV - Evaporative Emission System
- Circuit Test HW - Evaporative Emission Purge Flow System
- Circuit Test Ja - Ignition No-Spark
- Circuit Test JB - Ignition Misfire Under Load
- Circuit Test JC - Ignition Coil Failure
- Circuit Test KA - Fuel Pump Relay
- Circuit Test Kb - Fuel Pump Driver Module (FPDM)
- Circuit Test KE - Idle Air Control (IAC) Valve
- Circuit Test KF - Fan Control (FC) Relay
- Circuit Test Km - Wot A/C Cut-Off (WAC)
- Circuit Test MB - Output State Diagnostic Test Mode Not Functioning
- Circuit Test MC - Spark Output Check
- Circuit Test NA - Ignition Diagnostic Monitor (IDM)
- Circuit Test NB - Malfunction Indicator Light (Mil)
- Circuit Test ND - Engine Rpm/Vehicle Speed Limiter
- Circuit Test QA - Unable To Activate Self-Test/SCP Communication Error Code Not Listed
- Circuit Test QB - Diagnostic Trouble Code P0603/P1605
- Circuit Test QC - Diagnostic Trouble Code P1000
- Circuit Test QD - Diagnostic Trouble Code P1260
- Circuit Test Ta - Clutch Pedal Position (CPP) Switch
- Circuit Test Tb - Transmission Control Switch (TCS)/Transmission Control Indicator Lamp (TCIL)
- Circuit Test TC - Transmission Solenoids
- Circuit Test TD - Transmission Range (Tr) Sensor
- Circuit Test Te - Transmission Fluid Temperature (TFT) Sensor
- Circuit Test TF - Output Shaft Speed (OSS) Sensor Turbine Shaft Speed (TSS) Sensor
- Circuit Test X - Constant Control Relay Module (CCRM)
- Circuit Test Z - Intermittent
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.