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 MANUALSFORD1994F 150 4WD PICKUP V8-351 5.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSTF - TURBINE SHAFT SPEED SENSOR/OUTPUT SHAFT SPEED SENSORTF15 - CHECK TSS OUTPUT
1994 Ford F 150 4WD Pickup V8-351 5.8L
TF15 - Check TSS Output
1994 Ford F 150 4WD Pickup V8-351 5.8LSECTION TF15 - Check TSS Output
- Key "OFF".
- Powertrain Control Module (PCM) connected to breakout box.
- Reconnect transmission 12 pin connector.
- Digital Volt/Ohm Meter (DVOM) on AC scale (to monitor less than 5.0 volts AC).
- Start engine.
- Measure voltage between test pins 24 and 44 at breakout box while varying engine rpm.
- Does AC voltage vary greater than 0.5 volt?
Yes -- Replace PCM. Remove breakout box. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
No -- Replace Turbine Shaft Speed (TSS) sensor. Remove breakout box. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
RENDER: 1.0x
NO RELATED
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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.