Inspection and Verification
Inspection and VerificationWARNING: Never remove the pressure relief cap under any conditions while the engine is operating. To avoid having scalding hot coolant or steam blow out of the cooling system, use extreme care when removing the pressure relief cap from a hot degas bottle. Wait until the engine has cooled, then wrap a thick cloth around the pressure relief cap and turn it slowly one turn (counterclockwise). Step back while the pressure is released from the cooling system. When certain all the pressure has been released, remove the pressure relief cap (still with a cloth). Failure to follow these instructions can result in damage to the cooling system or engine and/or personal injury.
CAUTION: Check the coolant level and engine oil, top off the coolant if needed. If there is engine coolant in the engine oil, the cause must be corrected and oil changed or major component damage can occur.
CAUTION: Vehicle cooling systems are filled with Motorcraft Premium Gold Engine Coolant or equivalent (yellow color). Always fill the cooling system with the same coolant that is present in the system. Do not mix coolant types.
NOTE: The degas bottle has 2 reservoirs and 2 pressure relief caps. The front (larger) reservoir and pressure relief cap is part of the engine cooling system. The rear (smaller) reservoir and pressure relief cap is part of the motor electronics cooling system. The 2 reservoirs are separate and both cooling systems are independent of each other.
1. NOTE: The addition of Cooling System Stop Leak Pellets VC-6, darkens Motorcraft Premium Gold Engine Coolant from yellow to golden tan.
Verify the customer concern by operating the engine to duplicate the condition.
2. Inspect to determine if any of these mechanical or electrical concerns apply.
Visual Inspection Chart
Visual Inspection Chart:
3. If the inspection reveals an obvious concern that can be readily identified, repair it as necessary.
4. NOTE: Make sure to use the latest scan tool software release.
If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
5. NOTE: The vehicle communication module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
If the scan tool does not communicate with the VCM:
^ check the VCM connection to the vehicle. check the scan tool connection to the VCM.
^ refer to Information Bus (Module Communications Network), No Power To The Scan Tool, to diagnose no communication with the scan tool.
6. If the scan tool does not communicate with the vehicle:
^ verify the ignition key is in the ON position.
^ verify the scan tool operation with a known good vehicle.
^ refer to Information Bus (Module Communications Network) to diagnose no response from the powertrain control module (PCM).
7. Carry out the network test.
^ If the scan tool responds with no communication for one or more modules, refer to Information Bus (Multiplex Communications Network).
^ If the network test passes, retrieve and record continuous memory diagnostic trouble codes (DTCs).
8. Clear the continuous DTCs and carry out the self-test diagnostics for the powertrain control module (PCM).
9. If the DTCs retrieved are related to the concern, go to the Powertrain Control Module (PCM) DTC Chart.Diagnostic Trouble Code Tests and Associated Procedures For all other DTCs, refer to Body Control Systems (Multifunction Electronic Control Module).
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures