P1290 Ford - Cylinder Head Temperature Sensor Signal Less Than Self-Test Range
Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean? http://engine-codes.com/p1290_ford.html Forum Code
- Wrong thermostat
- Not at operating range
- Engine overheated
- Low engine coolant level
- Faulty Cylinder Head Temperature (CHT) sensor
- Cylinder Head Temperature (CHT) sensor harness is open or shorted
- Cylinder Head Temperature (CHT) sensor circuit poor electrical connection What does this mean?
When is the code detected?
The Engine Control Module (ECM) detected the cylinder head temp below expected values
- Engine Light ON (or Service Engine Soon Warning Light)
P1290 Ford Description
The Cylinder Head Temperature (CHT) Sensor is mounted into the wall of the cylinder head and is not connected to any coolant passages. The CHT sends a signal to the Powertrain Control Module (PCM
) indicating the cylinder head temperature. If the temperature exceeds 126°C (-258°F), the PCM
disables four fuel injectors at a time. The PCM
will alternate which four injectors are disabled every 32 engine cycles. The four cylinders that are not being fuel injected act as air pumps to aid in cooling the engine. If the temperature exceeds 154 °C (310°F), the PCM
disables all of the fuel injectors until the engine temperature drops below 154°C (310°F).
Read more: http://engine-codes.com/p1290_ford.html#ixzz3iX7EnL32