very very nice checking there.
the EGR modulator is tuned to use the cat back pressure.
The egr is dead, at 0 miles per hour, totally. and at W.0.T.
so this must be driving . when cat back pressure , is strong, and stronger up hills.
yes, the modulator works backwards from what wed expect. its is a very very odd device.
the key to this is my cross section drawing.
if the cat is missing, there is no putt, or is crazy week.
the modulator diaphragm moves in a backwards way.
no the thermoprobe is only a test, and code 51.
the thermoproble can be fooled, a 10k ohm resistor (in its place) lies to the ECU, the silly ECU forgets to check for cold then hot, (at cruise) then assumes it was cold before, and is hot now, its dumb that way, it just waits for the EGR to go active (say light cruise) and if hot is read, no CODE 51 are tripped. It fails to do a real transition tests. (all this is theory we'd never run a 10k on the street, but do all day in South America. )
yes the dead thermo probe "EGRT", stuck cold does set 51s, (correct ECM in place)
Data Points for the EGRT: source Pg, 6E99 FSM. ( has a graph plot and test procedure)
212
the EGR modulator is tuned to use the cat back pressure.
The egr is dead, at 0 miles per hour, totally. and at W.0.T.
so this must be driving . when cat back pressure , is strong, and stronger up hills.
yes, the modulator works backwards from what wed expect. its is a very very odd device.
the key to this is my cross section drawing.
if the cat is missing, there is no putt, or is crazy week.
the modulator diaphragm moves in a backwards way.
no the thermoprobe is only a test, and code 51.
the thermoproble can be fooled, a 10k ohm resistor (in its place) lies to the ECU, the silly ECU forgets to check for cold then hot, (at cruise) then assumes it was cold before, and is hot now, its dumb that way, it just waits for the EGR to go active (say light cruise) and if hot is read, no CODE 51 are tripped. It fails to do a real transition tests. (all this is theory we'd never run a 10k on the street, but do all day in South America. )
yes the dead thermo probe "EGRT", stuck cold does set 51s, (correct ECM in place)
Data Points for the EGRT: source Pg, 6E99 FSM. ( has a graph plot and test procedure)
212
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