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 MANUALSFORD1999ECONOLINE E350 1 TON V10-6.8L VIN SREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE TEMPERATURE SENSORDESCRIPTION AND OPERATION
1999 Ford Econoline E350 1 Ton V10-6.8L VIN S
Engine Temperature Sensor: Description and Operation
1999 Ford Econoline E350 1 Ton V10-6.8L VIN SSECTION Description and Operation
The Cylinder Head Temperature (CHT) sensor:
^ is mounted into the back of the left cylinder head and is not connected to any coolant passages.
^ sends a signal to the powertrain control module indicating the cylinder head temperature.
- If the temperature exceeds approximately 121 °C (260°F), the powertrain control module disables some fuel injectors. The powertrain control module will alternate which fuel injectors are disabled every 24 engine cycles. The cylinders that are not being fuel injected act as air pumps to aid in cooling the engine.
- If the temperature exceeds approximately 166°C (330°F), the powertrain control module disables all of the fuel injectors until the engine temperature drops below approximately 124°C (260°F).
^ DTCs are set.
^ If the engine reaches critical temperature, the following happens:
- The coolant temperature gauge pointer will read fully hot at approximately 121°C (260°F).
- The check gauge warning indicator will illuminate.
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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.