Emissions equipment for bmw 3 series e46 1999 2006.
Bmw e46 evap system diagram.
P0442 bmw meaning the evaporative system monitoring permits the detection of leaks in the evaporative system with a diameter of 0 02 inches and up.
You need to complete a drive cycle for the car to evaluate the evap system and mark it ready.
When the dme activates the dm tl for leak testing it first activates only the pump motor.
By means of a diagnostic module tank leakage dmtl an electrically actuated pump located at the atmospheric connection of the evaporative canister a pressure test of the evaporative system is.
This value is equivalent to the size of the restricter.
See page 2 of the link.
Does anyone have a diagram of the evap system.
I do not have the evap system and fuel tank venting fully committed to memory but most systems have both a purge and vent valve but i believe most of the e46 have the ldp leak detection pump and evap solenoid under the intake.
Usa link for purge control valve http amzn to 2xm1taq canadian link for purge control valve https amzn to 2kysja6 in this video i will show you how to re.
Http amzn to 2ipwemn repair talk starts at 1 12 here s the diy guide to replacing the purge valve i.
Get new purge valve.
This pumps air through a restricter orifice 1 0 or 0 5 mm which causes the electric motor to draw a specific amperage value.
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Also the car will not even attempt to run an evaluation of the evap system if you have more than 3 4 or less than 1 4 tank of gas or if it s too hot or too cold out.
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This system consists of an air pump exhaust manifold input check valve and a vacuum control switch along with the associated input and vacuum hoses and electrical input circuit to the vacuum control switch.
Evaporative system through the sprung open valve of the dm tl.
There may be a few variations on the e46 evap system i do not recall all the different options.
Some of the most common check engine fault codes for bmws from 1996 through the mid 2000s involve the secondary air injection system.
