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.
Section 15 (Automatic Transmission - 8-Speed Automatic Transmission - 8F57 Part 1)
2021 Ford Edge SE, 4WDSECTION Section 15 (Automatic Transmission - 8-Speed Automatic Transmission - 8F57 Part 1)
WARNING: This page is about a different variant/trim than selected.
- Specifications
- Description And Operation
- Transmission Description - Overview
- Transmission Description
- Transmission Description - System Operation and Component Description
- A Clutch
- B Clutch
- C Clutch
- Electronic Selectable One-Way Clutch Assembly
- E Clutch
- F Clutch
- Torque Converter Clutch (TCC)
- Main Control Valve Body
- Pump Assembly
- Input Shaft
- Planetary Assembly
- Final Drive
- Differential
- Transmission Fluid Auxiliary Pump
- Diagnosis And Testing
- Diagnostic Strategy
- Preliminary Inspection
- Road Testing Vehicle
- Leakage Inspection
- Parameter Identification (PID) Chart
- DTC Chart and Pinpoint Tests
- DTC Chart: PCM
- Pinpoint Tests
- Pinpoint Test A: Transmission Control Solenoids
- Pinpoint Test B: Transmission Fluid Temperature (TFT) Sensor
- Pinpoint Test C: Transmission Range (Tr) Sensor
- Pinpoint Test D: Output Shaft Speed (OSS) Sensor, Turbine Shaft Speed (TSS) Sensor And Intermediate Speed Sensor A (ISSA)
- Pinpoint Test E: Torque Converter Clutch (TCC), Line Pressure Control (LPC) Solenoids
- Pinpoint Test F: OSS Sensor, TSS And ISSA Sensor Performance DTC Faults
- Pinpoint Test G: Transmission Fluid Pressure Sensor "A" And "B" DTCS
- Pinpoint Test H: Park Lock Pawl Solenoid
- Pinpoint Test I: Shift Solenoid "D" - Electronic SELECTABLE One-Way Clutch
- Pinpoint Test J: Transmission Fluid Auxiliary Pump
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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.