Pinpoint Test B : Pinpoint Test: Notes

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

The Engine Overheats

Normal operation and Fault Conditions

The secondary cooling system maintains temperatures in the CAC and the fuel cooler during operation. Correct coolant flow through the radiator and the remaining components of the system is essential to maintaining correct temperatures.

Coolant flows primarily from the coolant pump to the radiator circuit and then to the CAC and the fuel cooler from the thermostat. The coolant flows from each component to the degas bottle and then back to the coolant pump. The coolant pump is operated by engine rotation through a pulley which is driven by the accessory drive belt to circulate the coolant. The coolant thermostat is a control valve actuated by coolant temperature. When the thermostat is closed, coolant flow bypasses the radiator circuit and flows to the cooling components. When the thermostat is opened, coolant is allowed to flow through the radiator circuit in order to transfer component-generated heat to the outside air.

System overheating generally occurs when there is a disruption in the ability to control either coolant flow at the proper rate, the inability to transfer heat from the cooling components through the coolant (including low coolant) or an inability to transfer component-generated heat to the outside air through the radiator.

Possible Sources

Low coolant level
Pressure relief cap installation
Restricted airflow through A/C condenser/radiator
Coolant condition/concentration
Accessory drive components
Non-OEM engine enhancement components
Thermostat
ECT sensor - secondary cooling system ECT 2
Charge Air Cooler Temperature (CACT) sensor
Coolant pump
Coolant flow restriction

Diagnostic Trouble Code (DTC) Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
P007D	CACT Sensor Circuit High	Indicates a higher than expected air temperature as the air flows out of the CAC.
P2185	Engine Coolant Temperature (ECT) Sensor 2 Circuit High	Indicates higher than expected coolant temperature as the coolant flows out of the radiator.