July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

EGR Protective Circuit

Connect vacuum tester, with "Y" fitting to EGR valve. Run engine to 1200 RPM, then pull off plug on coolant temperature switch and hold against ground. With 10 in. Hg on EGR valve, cooling fan clutch should come on. If cooling fan is not on, check electrical circuit and repeat test. If circuit is okay, replace ECU.