Questions and Answers

Dodge RAM DTCs P0336, P1689, P1693 Q. Hello, I have a 1999 Dodge RAM 3500 5.9 liter diesel turbo and manual transmission that I got error codes on, but no help. When cold, it always starts. I can drive it for awhile and it will loose power, the tachometer quits and if I kill it, it won't usually start for awhile. The Check Engine Light stays on. The codes that were given me are:

• P0336 - Ckp Signal Error
• P1693 - DTC Detected in PCM
• P1689 No Com between ECM & Ins

I would appreciate your help with these codes. It has 140,000 miles. The tachometer will randomly work and quit.

Thanks,
Donny

A. Okay, first the DTCs.

• P0336 - Indicates a problem with the voltage signal from the Crankshaft Position Sensor (CKP).
  

  POSSIBLE CAUSES:

  • DTC not = To freeze frame DTC
  • Ckp sensor ground circuit open
  • Ckp wiring harness intermittent defect
  • 5-volt supply circuit open
  • 5-volt supply circuit shorted to ground
  • Ckp sensor signal circuit open
  • Ckp sensor signal circuit shorted to ground
  • Crankshaft position sensor def
  • Engine control module defective

• P1689 - Indicates a Data link failure between ECM and fuel injection pump. Low power, engine dereated or engine stops.
  

  POSSIBLE CAUSES:

  • Fuel Inj pump Gnd ckt open or high resistance
  • Fuel pump ctrl mod harness observable defect
  • Datalink (+) circuit open
  • Datalink (+) circuit short to ground
  • Datalink (-) circuit open
  • Datalink (-) circuit short to ground
  • Engine control module defective

• P1693 - Indicates a fault code has been generated in the companion engine control module.

P0336 is saying you probably have a bad CKP. Here are the diagnostic charts for DTC P0336:

Here are the diagnostic charts for DTC P0336:

Some of these tests require the Chrysler DRB scan tool, but there are electrical tests listed you can do to find the problem.