I have a 2008 which I recently converted to a cummins 5.9 common rail. After the conversion everything on the truck worked peachy until one day the tachometer stopped working, as did the A/C.
Both the ford cam and crank sensor are adapted onto the cummins to allow the Ford "smart dash" to function.
I get a consistent P0341 in the ford pcm
for "Camshaft Position Sensor A Circuit Range/Performance (Bank 1 or Single Sensor)"
I chased the P0341 according to https://www.motorcraftservice.com/pu...15/V8E5093.HTM
everything checked out until I got to V4 "CHECK THE CMP CIRCUITS FOR A SHORT TO VOLTAGE IN THE HARNESS"
where i find 2.5V at both + and - terminals of the cmp connector (Key on, engine off, sensor unplugged)
If voltage is found the chart says to locate the short to voltage in the harness.
I separated the harness and isolated the pair of wires for the cmp connector.
Under the tape, the pair of wires is sheathed in foil along with a bare wire which goes through the pcm
connector and to ground, this is factory ford portion of the harness.
I checked for continuity between the two wires for the sensor while bending and jiggling the length of the harness and there was none. No damage to any of the wiring or signs of heat/ chafing.
I checked for continuity between both sensor wires and the bare wire and there was none.
There is never any voltage at the bare wire.
No bent pins or signs of heat in the pcm
Voltage at two pins which should have 0.
Is this PCM
internally shorted or otherwise damaged somehow?
I don't understand where this 2.5V is coming from.
This system all worked fine for a thousand miles or so.