A heavy truck , in what country, ?
we cant guess that, nor year,
nor what EFI your country uses.
the question is not clear either.
what are you doing? please state what job you are doing?
and at what step you get confused.
or post symptoms.
are you asking , will my engine stall with the CMP disconnected
answer yes. (wild guess on question )
Insert the square tip of a 1/2-inch socket wrench into the square hole in the center of the serpentine belt's adjustment pulley. The adjustment pulley is the smallest pulley the belt wraps around.
Pull the adjustment pulley toward the engine with the socket wrench to release the tension on the serpentine belt, then pull the belt off the air conditioning compressor's pulley.
Remove the bolts which secure the air conditioning compressor to its mounting brackets with an open-end wrench, then position the compressor to the side of the engine compartment. Do not disturb the hoses that attach to the compressor.
Pull the electrical connection off the crankshaft sensor.
Remove the two bolts that secure the crankshaft sensor against the engine with an open-end wrench, then slide the sensor out of the engine.
Slide the new crankshaft sensor into the engine, then install and tighten the sensor's two securing bolts with an open-end wrench.
Press the electrical connection onto the crankshaft sensor.
Position the air conditioning compressor against its mounting brackets, then install and tighten the compressor's bolts with an open-end wrench.
Pull the serpentine belt's adjustment pulley toward the engine with the socket wrench, then position the belt onto the air compressor's pulley.
2 pin socket (magnetic - sine wave output). One pin is 'ground' the other is
'signal'. A voltmeter set to 2 volts AC (note) should measure a signal in the 0.2 to 2 volts range on the 'signal' pin.
3
pin socket (Hall effect, magneto - square wave form output). One pin is 'reference' (5volts), one pin is
'ground' and the third pin is 'signal'.
A DC (note) voltage should be detectable in the 0.5 to 1.5 volt range from the
'signal' pin.
It is important that the voltage measurement
take place at start up when the engine is cold and again, 20 minutes later,
when the engine has fully warmed up to operating temperature.
These devices do not often fail and are expensive if purchased from the the Mercedes dealership, shop around on-line or try a breakers yard.
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