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 MANUALSFORD1999WINDSTAR BASE, VAN CARGO, 3.8 4REPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSDIAGNOSIS - AX4S AUTOMATIC TRANSMISSION
1999 Ford Windstar Base, Van Cargo, 3.8 4
Diagnosis - Ax4S Automatic Transmission
1999 Ford Windstar Base, Van Cargo, 3.8 4SECTION Diagnosis - Ax4S Automatic Transmission
- Application
- Description & Operation
- Notes
- Self-Diagnostic System
- Pcm Location
- Input Sensors
- Air Conditioning Clutch (ACC) Switch
- Brake Pedal Position (BPP) Switch
- Crankshaft Position (CKP) Sensor & Electronic Ignition (EI)
- Engine Coolant Temperature (ECT) Sensor
- Intake Air Temperature (IAT) Sensor
- Mass Air Flow (MAF) Sensor
- Power Steering Pressure (PSP) Switch
- Transmission Control Switch (TCS) & Transmission Control Indicator Light (TCIL)
- Transmission Fluid Temperature (TFT) Sensor
- Throttle Position (TP) Sensor
- Transmission Range (TR) Sensor - Digital
- Output Shaft Speed (OSS) Sensor (Windstar) Or Turbine Shaft Speed (TSS) Sensor
- Vehicle Speed Sensor (VSS)
- Output Devices
- Trouble Shooting
- Symptom Tests
- Harsh Forward Engagement Only
- Harsh Reverse Engagement Only
- Some Or All Shifts Missing
- Some Or All Shifts Early Or Late
- Erratic Or Hunting Shifts
- Soft Or Slipping Shifts
- Delayed/Soft Forward
- Delayed/Soft Reverse
- Harsh Shifts
- No 1ST Gear In Drive, Engages In Higher Gear
- No Engine Braking In "D" Position (3RD Gear)
- No 1-2 Upshift In "D" Position
- No 2-3 Upshift In "D" Position
- No 3-4 Upshift In "D" Position
- No 4-3 Downshift
- No 3-2 Or 2-1 Downshift
- No TCC Engagement
- TCC Always Engaged
- TCC Cycling Or Shuddering
- Poor Vehicle Performance
- Engine Will Not Crank
- Transaxle Overheating
- Diagnosis & Testing
- System Tests
- Notes
- How To Use System Tests
- Test A: Shift Solenoids
- Test B: Transmission Fluid Temperature (TFT) Sensor
- Test C: Torque Converter Clutch (TCC) Solenoid
- Test D: Transmission Range (Tr) Sensor
- Test E: Electronic Pressure Control (EPC) Solenoid
- Test F: Turbine Shaft Speed (TSS) Sensor
- Test G: Output Shaft Speed (OSS) Sensor (WINDSTAR)
- Test H: Solenoid Mechanical Failure
- Removal & Installation
- Wiring Diagrams
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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.