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 MANUALSFORD1999MUSTANG GT, 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 24 (ENGINE CONTROLS - THEORY & OPERATION - GASOLINE & NGV)
1999 Ford Mustang GT, 2D Convertible, Standard
Section 24 (Engine Controls - Theory & Operation - Gasoline & NGV)
1999 Ford Mustang GT, 2D Convertible, StandardSECTION Section 24 (Engine Controls - Theory & Operation - Gasoline & NGV)
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2002 Mercury Sable, 2002 Mercury Mountaineer, 2002 Mercury Grand Marquis, 2002 Mercury Cougar, and 2002 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Air Induction Systems
- Computerized Engine Controls
- Powertrain Control Module
- Power & Ground Signals
- Powertrain Control Module Software
- Diagnostic Monitors
- Notes
- Catalyst Efficiency Monitor Description
- Catalyst Efficiency Monitor - Switch Ratio Method (1996-2002)
- Catalyst Efficiency Monitor - Index Ratio Method (Some 2001-Later)
- General Catalyst Monitor Operation
- Comprehensive Component Monitor
- Evaporative Emission Leak Check Monitor
- Exhaust Gas Recirculation System Monitor - Differential Pressure Feedback EGR
- Electric Exhaust Gas Recirculation System Monitor
- Fuel System Monitor
- Heated Oxygen Sensor Monitor
- Misfire Detection Monitoring
- Secondary Air Injection System Monitor - Electric Secondary Air Injection Pump System
- Thermostat Monitor
- Constant Control Relay Module
- Fuel Pump Driver Module
- Generic Electronic Module
- Natural Gas Vehicle Module
- Input Devices
- Notes
- A/C Cycling Switch
- A/C Pressure Sensor
- Air Conditioning Evaporator Temperature Sensor
- Air Conditioning Pressure Sensor
- A/C High Pressure Switch
- Brake Pressure Applied/Brake Deactivator Switch
- Brake Pedal Position Switch
- Camshaft Position Sensor
- Clutch Pedal Position Switch
- Crankshaft Position Sensor
- Cylinder Head Temperature Sensor
- Differential Pressure Feedback EGR Sensor
- Engine Coolant Temperature Sensor
- Engine Fuel Temperature Sensor
- Engine Oil Temperature Sensor
- Fan Speed Sensor
- Fuel Level Input
- Fuel Pump Monitor (With Fuel Pump Driver Module)
- Fuel Pump Monitor (Without Fuel Pump Driver Module)
- Fuel Tank Pressure Sensor
- Fuel Rail Pressure Sensor
- Generator Load
- Generator Monitor
- Heated Oxygen Sensor
- Intake Air Temperature Sensor
- Intake Manifold Runner Control
- Intake Manifold Swirl Control
- Intake Manifold Tuning Valve
- Knock Sensor
- Mass Airflow Sensor
- Output Shaft Speed Sensor
- Power Steering Pressure Sensor
- Power Steering Pressure Switch
- Power Take-Off Switch
- Thermal Manifold Absolute Pressure Sensor
- Throttle Position Sensor
- Transmission Control Switch
- Vehicle Speed Sensor
- 4x4 Mode Switch
- Output Devices
- Notes
- Canister Vent Solenoid
- Coil Pack
- Coil On Plug
- EGR Vacuum Regulator Solenoid
- Electric Secondary Air Injection Pump
- Evaporative Emission Canister Purge Valve
- Fan Control
- Fuel Cap Off Indicator Light
- Fuel Injectors
- Fuel Pump (Applications Using Fuel Pump Relay For Fuel Pump ON/OFF Control)
- Fuel Pump Driver Module Applications & Applications With Fuel Pump Functions Incorporated In Rear Electronic Module)
- Generator Communication
- Hydraulic Cooling Fan Drive (LS & Thunderbird Only)
- Idle Air Control Valve
- Intake Manifold Runner Control
- Intake Manifold Swirl Control
- Intake Manifold Tuning Valve
- Malfunction Indicator Light
- Secondary Air Injection By-Pass Solenoid
- Solid State Relay
- Thermostat Heater Control
- Transmission Control Indicator Light
- Wide Open Throttle A/C Cut-Off Relay
- Vapor Management Valve
- Vehicle Speed Output
- Visctronic Drive Fan Clutch
- Fuel Systems (Gasoline)
- Fuel System (Natural Gas)
- Ignition Systems
- Variable Cam Timing System
- Catalyst & Exhaust Systems
- Evaporative Emission Systems
- Secondary Air Injection System
- EGR Systems
- Self-Diagnostic System
- Miscellaneous Controls
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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.