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Old 05-24-2007, 08:13 PM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
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2003 L-Series 3.0L Sedan
Default Re: P0727 & P1780 DTC's

DTC P1780 Park/Neutral Position [PNP] Switch Circuit

DTC P0727 Engine Speed Circuit No Signal

1780; The neutral safety switch prevents starting in D, R, and L. Only in Park or Neutral but if the switch becomes misaligned over the years you won't be able to start in unless you push the shifter forward while turning the key to START. Same in Neutral. If a manual then the clutch safety switch may be misaligned.

0727; This one I think is the crank position sensor. Can the starter crank all day until the battery dies w/o the engine firing? The second test is to remove the coil wires from #1 and #4 and crank the engine while observing for sparks jumping across the coils; no sparks = defective crank position sensor. It's located behind and above the starter.

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