your egr is mounted on the exhaust manifold and a switch overvalve is mounted on the wall. Ill take a picture for you. every car has a system in place to do the role of egr whether its mechincal or electrical(electrical egr, variabl valve timing(vvti) like in a lexus/toyota.

60% is road speed at ke control unit is an implausible-test hall effect sensor

70% is no tna signal plauisble, open circuit to ke control unit-test tna signal

btw you are supposed to do that after reading the fault memory @ x11/4

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)