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ronb -> RE: pmd question (1/3/2008 10:50:26 PM)
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they are calibration resistors that run the injection pump at it's optimum performance. The truck will run without one, #5 works on all injection pumps. I only know this because I just relocated my pmd and have spent a bit of time on the phone with Dave Breggin at BlueHummer Outfitters.
http://breggin-enterprises.stores.yahoo.net/fsdcare.html
here's aexcert from Chuck's site flashoffroad.com:
If you get a new FSD you will need a new calibration resistor pack for $20. The resistor describes the pump to the electronic control system. The resistor must match the pump, not the FSD/PMD. When I purchased the FSD, there was no resistor with it - I had to buy one separately. I believe that if you get a complete pump & FSD, a new resistor (matching the pump) will be included.
The #5 is considered the "average", and almost any pump will work with a #5 resistor. The resistor is only used when the control computer forgets what the value is, like after the batteries are disconnected. If you don't use a resistor you will get a p1218 error code when the computer tries to read the value.
You can get the computer to see the new resistor by initiating a TDC Learn with a tech 2 scan tool. The computer will check the resistor value on it's own every 50 startups.
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