Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Fuel temperature overheating may be cause by a fuel heater element that is stuck on. Refer to Fuel Heater Always On
.
With ignition ON and the engine OFF, observe the Fuel Temperature and ECT Temperature parameters with a scan tool.
- If the temperatures do not closely match each other when the engine has cold soaked overnight, test for a skewed fuel temperature sensor. Refer to Component Testing in the diagnostic.