P1184 FORD F150 – Engine Oil Temperature Out of Self-Test Range

P1184 FORD F150 Possible Causes

• Engine is not at operating temperature.
• Cooling system problem with stuck thermostat.
• Faulty Engine Oil Temperature (EOT) sensor
• Engine Oil Temperature (EOT) sensor harness is open or shorted
• Poor electrical connection in the Engine Oil Temperature (EOT) sensor circuit
• Faulty Engine Control Module (ECM)

How to Fix P1184 Code FORD F150?

Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

Indicates that the Engine Oil Temperature (EOT) signal was outside the self-test range.

Possible Symptoms

• Check Engine Light on (or Service Engine Soon warning light)

P1184 FORD F150 Meaning

The Engine Oil Temperature (EOT) sensor is a thermistor device where resistance changes with temperature. The electrical resistance of a thermistor decreases as temperature increases and resistance increases as temperature decreases. The variable resistance affects the voltage drop across the sensor terminals and provides an electrical signal to the Engine Control Module (ECM) corresponding to the temperature.
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that the change in the passive sensor’s resistance causes a change in the total current flow.
The voltage that drops across a fixed resistor in series with the sensor resistance determines the voltage signal at the ECM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The EOT sensor measures the engine oil temperature. The sensor is typically screwed into the engine oil lubrication system. The ECM can use the EOT sensor input to determine the following:

– On Variable Camshaft Timing (VCT) applications, the EOT input is used to adjust VCT control gains and camshaft timing logic.
– The ECM can use the EOT sensor input in conjunction with other ECM inputs to determine oil degradation
– The ECM can use the EOT sensor input to trigger an engine shut down. To prevent engine damage due to high oil temperature, the ECM has the capability to trigger an engine shut down. Whenever the engine speed exceeds a calibrated level for a certain time, the ECM begins to reduce power by disabling engine cylinders.