JVDodge

Cuzin down the highway @ 60 MPH all is well..........
Tachometer drops to zero (0) and engine has no power. Pull over, turn off, restart, runs for 20 sec. RPM back down to zero (0) then dies. Code P 1693

Wondering where RPM sensor is located and would imagine this has an impact on the ECM and how it monitors the fuel.

Any input would be greatly appreciated.....stuck @ home in the garage.

Help..........

matthopp

Camshaft Position Sensor, under the VP44. About a $50 part, need small hands to change with IP on, very easy to do with it off. I think it would cause your problems.

revolution_dsl

what year truck? could be a crank sensor as well, but i didnt look up the code...isnt 1693 a companion code?

JVDodge

Is the Tachometer driven off of the Camshaft Position sensor (CMP) or the Crankcase Position sensor (CKP)?

04DEEZELRAM

That would be your crank sensor, and it behind the starter, its really easy to change, and thats were the ecm gets the rpm's for the tach.

mini14

98.5-2000 Have crank sensor-that drives the tach....2000-up cam sensor drives the tach.

CTD NUT

Depends on the year.....what year is your truck? 98.5 - 00 have a CKP which will cause the exact symptoms you described. The 1693 is the companion code that only tells you that there is another code present that you didn't or can't retrieve. A scanner will most likely pull an additional P0336 DTC for the CKP. From the sounds of it, I'm guessing you have a 2000 truck since you can read codes in the OD display and you have a CKP?

JVDodge

Updated my signature - 2001
Big difference in R&R time. Cam/Crank sensor. Based on the feedback from all of you, it sounds like the Camshaft sensor?

mini14

then it has to be the cam sensor...get yerself a set of long soketed allen keys, and a womens hand, unless u feel like pulling the vp.u can see the sensor behind the vp from underneath.

theterminator72

No crank sensor on an 01, just the cam sensor below the vp44