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 MANUALSFORD2021EXPEDITION MAX LIMITED, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - DIAGNOSTIC METHODS (EXCEPT DIESEL & HYBRID)
2021 Ford Expedition MAX Limited, RWD
Engine Controls - Diagnostic Methods (Except Diesel & Hybrid)
2021 Ford Expedition MAX Limited, RWDSECTION Engine Controls - Diagnostic Methods (Except Diesel & Hybrid)
- Diagnostic Methods
- Diagnostic Tools
- Scan Tool Setup And Functionality
- Vehicle Check And Preparation
- Quick Test Description
- Clear The Continuous Diagnostic Trouble Codes (DTCS) And Reset The Emission Monitors Information In The Powertrain Control Module (Pcm)
- Resetting The Keep Alive Memory (KAM)
- On Board System Readiness (OSR) Test
- Output State Control (OSC)
- Hybrid Diagnostic Modes
- Parameter Identification (PID)
- Freeze Frame Data
- Flash Electrically Erasable Programmable Read Only Memory (EEPROM)
- Diagnostic Monitoring Test Results Mode 6
- On Board Diagnostic (OBD) Drive Cycle
- Intermittent Diagnostic Techniques
- Adaptive Fuel Diagnostic Trouble Code (DTC) Diagnostic Techniques
- Notes
- Obtain Freeze Frame Data
- Using The LONGFT1 And LONGFT2 (Dual Bank Engines) PIDS
- Resetting Long Term Fuel Trims
- DTCS P0171 And P0174 System Too Lean Diagnostic Aids
- Air Measurement System
- Vacuum Leaks And UNMETERED Air
- Insufficient Fueling
- Exhaust System Leaks
- DTCS P0172 And P0175 System Too Rich Diagnostic Aids
- Fuel System
- Intake Air System
- Base Engine
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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.