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 MANUALSMERCURY1999TRACER LS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 1606 (ENGINE CONTROLS - DESCRIPTION AND OPERATION (EXCEPT DIESEL & HYBRID))
1999 Mercury Tracer LS, 4D Sedan, Standard
Section 1606 (Engine Controls - Description And Operation (Except Diesel & Hybrid))
1999 Mercury Tracer LS, 4D Sedan, StandardSECTION Section 1606 (Engine Controls - Description And Operation (Except Diesel & Hybrid))
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.
- Vehicle Emission Control Information (VECI)
- Vehicle Certification Label
- Vehicle Emission Control Information (VECI) Acronym Definitions
- Engine Control Components
- Notes
- Accelerator Pedal Position (APP) Sensor
- 2 Track APP Sensor - Fiesta
- Ambient Air Temperature (AAT) Sensor
- Barometric Pressure (BARO) Sensor
- Brake Pedal Position (BPP) Switch
- Brake Pressure Switch
- Camshaft Position (CMP) Sensor
- Charge Air Cooler Temperature (CACT) Sensor
- Check Fuel Cap Indicator
- Clutch Pedal Position (CPP) Switch
- Coil On Plug (COP)
- Coil Pack
- Cooling Fan Clutch
- Cooling Fan Control
- Crankshaft Position (CKP) Sensor
- Cylinder Head Temperature (CHT) Sensor
- Differential Pressure Feedback Exhaust Gas Recirculation (EGR) Sensor
- Differential Pressure Feedback EGR Sensor - Tube Mounted
- Electric Exhaust Gas Recirculation (EEGR) Valve
- Electronic Throttle Actuator Control (TAC)
- Electronic Throttle Body Throttle Position Sensor (ETBTPS)
- Engine Coolant Temperature (ECT) Sensor
- Evaporative Emission (EVAP) Canister Purge Valve
- Evaporative Emission (EVAP) Canister Purge Check Valve
- Evaporative Emission (EVAP) Canister Vent Solenoid
- Evaporative Emission (EVAP) Ejector Venturi Assembly
- Evaporative Emission (EVAP) Natural Vacuum Leak Detection (NVLD) Module
- Exhaust Gas Recirculation (EGR) Orifice Tube Assembly
- Exhaust Gas Recirculation (EGR) System Module (ESM)
- Exhaust Gas Recirculation (EGR) Vacuum Regulator Solenoid
- Exhaust Gas Recirculation (EGR) Valve
- Fan Speed Sensor (FSS)
- Fuel Injection Pump
- Fuel Injectors
- Fuel Injectors - Direct Injection
- Fuel Pump (FP) Assembly
- Fuel Pump (FP) Assembly and Reservoir
- Fuel Rail Pressure (FRP) Sensor
- Fuel Rail Pressure Temperature (FRPT) Sensor
- Fuel Tank Pressure (FTP) Sensor
- Heated Oxygen Sensor (HO2S)
- Idle Air Control (IAC) Valve
- Inertia Fuel Shut-off (IFS) Switch
- Intake Air Temperature (IAT) Sensor
- Intake Manifold Tuning Valve (IMTV)
- Knock Sensor (KS)
- Manifold Absolute Pressure (MAP) Sensor
- Mass Airflow (MAF) Sensor
- Output Shaft Speed (OSS) Sensor
- Power Steering Pressure (PSP) Sensor
- Power Steering Pressure (PSP) Switch
- Power Take-Off (PTO) Switch and Circuits
- Throttle Position (TP) Sensor
- Turbocharger
- Turbocharger Boost Pressure (TCBP) Sensor
- Turbocharger Bypass (TCBY) Valve
- Turbocharger (TC) Wastegate Regulating Valve Solenoid
- Universal Heated Oxygen Sensor (HO2S)
- Vehicle Speed Sensor (VSS)
- Engine Control (EC) System
- Powertrain Control Hardware
- Powertrain Control Module (PCM)
- PCM Locations
- 128-Pin PCM
- 140-Pin PCM
- 170-Pin PCM
- 190-Pin PCM
- 198-Pin PCM
- Fuel Pump Control Module
- Fuel Pump Driver Module (FPDM)
- Keep Alive Memory (KAM)
- Power and Ground Signals
- Accelerator Pedal Position Reference Voltage (APPVREF2) - Fiesta
- Accelerator Pedal Position Reference Voltage (APPVREF) - All Others
- Accelerator Pedal Position Return (APPRTN2) - Fiesta
- Accelerator Pedal Position Return (APPRTN) - All Others
- Electronic Throttle Control Reference Voltage (ETCREF)
- Electronic Throttle Control Return (ETCRTN)
- Gold Plated Pins
- Keep Alive Power (KAPWR)
- Mass Airflow Return (MAF RTN)
- Power Ground (PWRGND)
- Signal Return (SIGRTN)
- Starter Motor Request (SMR) Circuit
- Variable Reluctance Sensor Return (VRSRTN)
- Vehicle Buffered Power (VBPWR)
- Vehicle Power (VPWR)
- Vehicle Reference Voltage (VREF)
- Powertrain Control Module - Vehicle Speed Output (PCM-VSO)
- Powertrain Control Software
- Adaptive Airflow
- Brake Over Accelerator
- Check Fuel Cap Indicator
- Computer Controlled Shutdown
- Deceleration Fuel Shut-Off (DFSO)
- Engine Fluid Temperature Management
- Engine RPM Limiter
- Fail-Safe Cooling Strategy
- Failure Mode Effects Management (FMEM)
- Flash Electrically Erasable Programmable Read Only Memory (EEPROM)
- Fuel Level Input (FLI)
- Fuel Trim
- High Speed Controller Area Network (CAN)
- Idle Air Trim
- Idle Speed Control Closed Throttle Determination - Applications Without Electronic Throttle Control (ETC)
- International Standards Organization (ISO) 14229 Diagnostic Trouble Code (DTC) Descriptions
- Multiplexing
- Multiplexing Implementation
- Permanent Diagnostic Trouble Code (DTC)
- Vehicle Speed Limiter
- Malfunction Indicator Lamp (MIL)
- Catalyst and Exhaust Systems
- Evaporative Emission (EVAP) Systems
- Exhaust Gas Recirculation (EGR) Systems
- Fuel Systems
- Overview
- Electronic Returnless Fuel System (ERFS)
- Fuel Pump Control - ERFS
- Fuel Pump Monitor (FPM) - ERFS
- Mechanical Returnless Fuel System (MRFS) - Single Speed
- Fuel Pump Control - Single Speed MRFS
- Fuel Pump Monitor (FPM) - Single Speed MRFS
- Mechanical Returnless Fuel System (MRFS) - Dual Speed
- Fuel Pump Control - Dual Speed MRFS
- Fuel Pump Monitor (FPM) - Dual Speed MRFS
- Fuel Filters
- Pressure Test Point
- High Pressure Fuel System
- Ignition Systems
- Intake Air Systems
- Overview
- Throttle Body System Overview
- Features of the Throttle Body Assembly include
- Overview of the Intake Manifold Runner Control (IMRC) and Intake Manifold Tuning Valve (IMTV) Systems
- Intake Manifold Runner Control (IMRC) Electric Actuated System
- Intake Manifold Runner Control (IMRC) Vacuum Actuated System
- Intake Manifold Tuning Valve (IMTV) System
- Positive Crankcase Ventilation (PCV) System
- Supercharger and Charge Air Cooler (CAC) Systems
- (Torque Based) Electronic Throttle Control (ETC)
- Turbocharger and Charge Air Cooler (CAC) Systems
- Variable Camshaft Timing (VCT) System
- On Board Diagnostics (OBD) Monitors
- Air Fuel Ratio Imbalance Monitor
- Catalyst Efficiency Monitor
- Cold Start Emission Reduction Monitor
- Comprehensive Component Monitor (CCM)
- Electric Exhaust Gas Recirculation (EEGR) System Monitor
- Enhanced Thermostat Monitor
- Evaporative Emission (EVAP) Leak Check Monitor
- Exhaust Gas Recirculation (EGR) System Monitor - Differential Pressure Feedback EGR and EGR System Module (ESM)
- Fuel System Monitor
- Heated Oxygen Sensor (HO2S) Monitor
- Misfire Detection Monitor
- Positive Crankcase Ventilation (PCV) System Monitor
- Thermostat Monitor
- Variable Camshaft Timing (VCT) Monitor
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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.