Sierra Classic 2500 4WD V8-6.0L (2007)
Engine Control Module: Testing and Inspection
FUEL COMPOSITION DIAGNOSIS
SYSTEM DESCRIPTION
When an E85 compatible vehicle is built, an engine control module (ECM) or powertrain control module (PCM) replaced, or when the learned alcohol
content has been reset with a scan tool the fuel system will need to contain ASTM gasoline with 10 percent or less ethanol content. If the fuel in the
fuel system needs to be drained and replaced with ASTM gasoline, the engine will need to run at operating temperature and consume at least 1 liter of
fuel before the system will recognize the correct alcohol content. Either ASTM gasoline or ASTM E85 fuel can then be used
TEST
Step 1 - Step 7
