Jeep Ignition Sync Problems
Short summary:
Look carefully at the Jeep's crank and cam. sensor waveforms in ... reference. I call this comparison method color. form technology. The explanation of what's ...
Long summary:
sensor signal groups. Look at the difference in
the crank signalâ s three groups of four pulses
in relationship to the cam signal in the good
screen capture. Itâ s noticeable that the group
of crank sensor signals fits right into the cam
sensor signalâ s rise and fall. However you
chose to view it, the difference is clear.
Remember, the scan tool PID reported that
the system was in sync at the same time that I
collected the bad screen capture.
This out of sync condition occurs when the
oil pump drive shaft binds inside the oil
pump drive housing, causing the entire
housing to rotate slightly. The cam position
sensor is located at the top of the oil pump
drive housing, where the old distributor, cap
and rotor used to be located. In extreme
cases, the oil pump drive shaft or its camshaft
mating gears may break, causing a no-start
condition. More commonly, the housing
rotates slightly, causing the out of sync
condition seen here. If the housing does not
appear to be parallel with the block or shows
other signs of movement, the fix is to install a
new housing thatâ s been properly prelubed.
Refer to a computer-based repair information
system or a printed repair manual for the
proper cam sensor setup and installation
procedure. Use a drill bit to line up and set
the cam sensor. The hole in the shaft needs to
be aligned with the hole in the cam vane
blade. After installing the new parts, check
the sync with your scope to verify the repair.
The older engines used a similar setup.
However, this newer style ignition system uses
a Hall effect crank sensorâ not an AC-
generating crank sensor.
Itâ s not hard when you have the right
diagnostic equipment (including the stuff you
were born with), reference material and
training.
Source: www.wellsmfgcorp.com
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