Cylinder Head Temperature (CHT) sensor — replacement Ford F150
Note: The cylinder head temperature sensor is a major component of the Fail Safe Cooling system. This sensor varies the value of its voltage output in accordance with temperature changes. The change in the resistance values will directly affect the voltage signal from the CHT sensor. As thesensor temperature decreases, the resistance values will increase (voltage increases). If the cylinder head temperature exceeds 265-degrees F, the PCM disables half of the fuel injectors at a time. The cylinders that do not receive fuel act as cooling air pumps for the other cylinders. If the temperature exceeds 330-degrees F, the PCM disables all the fuel injectors. A problem in the CHT sensor circuit will set a diagnostic trouble code.
Caution: The CHT sensor is not to be reused. Install only a NEW CHT sensor once it is removed.
1. Remove the two nuts at the front of the engine cover. Lift up at the front and unhook the retainers at the rear of the cover to remove.
The CHT sensor is located near the left-bank turbocharger (2.7L model shown)
2. Locate the CHT sensor in the driver cylinder head and disconnect the electrical connector
3. Unscrew the CHT sensor from the cylinder head and discard.
4. Installation is reverse of removal. Tighten the NEW CHT sensor to specification shown in this Chapter’s Specifications.
3.5L non-turbo models
Note: The CHT sensor is located under the lower intake manifold in the passenger’s (right) cylinder head.
5. To remove the cylinder head temperature sensor, the upper and lower intake manifolds must be removed from the engine (see Intake manifold(s) – removal and installation).
6. Locate the CHT sensor in the passenger’s (right) cylinder head and unplug the electrical connector.
7. Unscrew the CHT sensor from the cylinder head and discard.
8. Installation is reverse of removal. Tighten the NEW CHT sensor to specification shown in this Chapter’s Specifications.
3.3L, 3.5L turbocharged and 5.0L models
Note: The CHT sensor is located at the rear of the passenger’s side (right) cylinder head, above the transmission bellhousing.
9. Loosen the right-front wheel lug nuts.
Raise and support the front of the vehicle