The coil pack resistance is out of tolerance on the primary side by approximately 0.3 ohms. Is this enough to cause the PCM to trigger the ASD? If so why is it doing it now when the van started right

Asked by Oct 17, 2016 at 09:02 AM about the 2000 Chrysler Town & Country Limited

Question type: Maintenance & Repair

Problem: Engine will crank and fire 2 to 3 times then shut down and only
crank unless I turn the key off and try to start again then fires 2 to 3 times and
shuts down. Engine will not fire up and stay running.

Symptoms: The van has been experiencing a lack of power and a reduction
in MPG. Down to 18 – 19mpg from mid-20’s.  The oil pressure was in the low
acceptable range. The serpentine belt began to whine so I replaced it. After
the whine was gone you could hear a “worble” sound.

History: I took the belt back off and started the van in effort to discover if the
“worble” was coming from any of the accessory equipment. The “worble”
sound was still present which to me indicated a possible timing chain or oil
pump issue. Upon investigation I found the timing chain had approx. 1.25’
total play from side to side on the rear portion of the chain. The oil pump was
also out of tolerance. I replaced the timing chain complete with cam and
crank sprockets and the oil pump. I made sure to line up the TDC arrows on
both cam and crank sprockets as well as installing the chain so the colored
links are in line with the dots at 3 o’clock on each sprocket. Since I was doing
this work I also replaced the cam shaft position sensor, water pump,
tensioner pulley and idle pulley.
Now the van will not start

What I have investigated:
Battery is fully charged and at 12.4 volts.
Battery terminals are tight, clean and corrosion free.
Checked the wiring harness as best I could for chaffing and/or breaks.
Checked all electrical connections and grounds
The fuel injectors are grounded.
The ASD relay is good.
Fuel pump is working and fuel rail is pressurized.
All fuses are ok.
The cam shaft position sensor is good. It is getting power and signals 5v
The coil pack test out at 12,500 ohms across the contacts on the secondary
side and .9 to 1 ohm on the primary side.
Cylinder compression for cylinders 2, 4, and 6 is 185, 180, 190 psi.

Question:
The coil pack resistance is out of tolerance on the primary side by
approximately 0.3 ohms. Is this enough to cause the PCM to trigger the
ASD? If so why is it doing it now when the van started right up and ran before
doing this work?

Vehicle: 2000 Chrysler Town and Country Limited
Engine: V-6 3.8L
Miles: 206,452

3 Answers

8,005

is your crankshaft sensor good? the coil pack is $30 plus shipping. it does not take a lot to trip the PCM they are very sensitive to electrostatic current.

1 of 1 people found this helpful.

Will check the crank sensor. On my way to get a new coil pack. So I guess I must have done something during my work to make things different with the coil form when I started Thanks

I checked the crank position sensor and decided it was bad so I replaced it. Problem continues. When I was checking the camshaft sensor a fairly loud sound would come from the PCM area every time I turned the crank to the cam pick up point for the 5v signal. I did not put a new coil in because when i went to pick up the new coil I took my ohm meter with me and checked its resistance and it registered the same as my existing. So maybe the upper limit for resistance is wrong in the Haynes manual.

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