When I tried to start my truck this morning the WTS was flashing. The truck will crank but will not start. I think it may be the ECM. The fuel pump will not run when i bump the starter, but will work off the battery on a switch. I have checked all relays, fuses and battery connections. There are three codes P0123, P17656, P1694. Does anyone have any ideas what else I can check?

hmm, guess that is why it was not mentioned and I could not find them in the FSM. So much to learn about this truck!!

no the glow plugs in the cylinders. this is what creates heat in the cylinder to cause ignition of the fuel. if there is not enough heat then there is no ignition. the grid heater only heats incoming air not the head.

No glow plugs in a cummins only intake heater

hmm, guess that is why it was not mentioned and I could not find them in the FSM. So much to learn about this truck!!

 

 

No glow plugs in a cummins only intake heater

 

Correct the grid heater is right there on the manifold and it creates temperatures as high as 480-500*F to start a cold Cummins engine. It draws 95 Amps per grid heater being there is 2 elements in the grid heater you can draw 190 Amps total during a cold start.

no the glow plugs in the cylinders. this is what creates heat in the cylinder to cause ignition of the fuel. if there is not enough heat then there is no ignition. the grid heater only heats incoming air not the head. 

There are no glow plugs in the 24V

I got the timpo replacement apps installed. There is no change, im still getting the flashing wait to start light. Next step replace ecm or should i take it to the dealership?

I would try to find a reputable local shop. The dealer will charge an arm/leg. The only reason I would go to the dealer is if their special scanners are required to diagnose anything. Other than that I will always go for a personally owned shop for repairs.

The only thing is you need the dealer DRBIII tool to flash a used ECM or a new ECM because they are sold blank.

No shop worth going to within towing distance....i found a website call diesel ecm source anyone heard of them. Here is the link http://dieselecmsource.com/

I know nothing about the company you posted. My nightmare with ECM's started with a company named ASI. All ECM's sold today are remans. The dodge on I got 2 years ago is still working fine. The 2 I got from ASI, 1 did not work at all and #2 lasted almost 1 year. The cruise control did not work at all.

Got a good update for y'all. I was doing some more poking around with the truck and did the apps ground mod from suncoast converters and truck is up and running. No flashing wait to start light. I have no clue why it worked but it did.

Got a good update for y'all. I was doing some more poking around with the truck and did the apps ground mod from suncoast converters and truck is up and running. No flashing wait to start light. I have no clue why it worked but it did.

 

Should not have to do the APPS ground wire mod. Also if this is correcting the WAIT TO START issue you have a bad ground for the ECM.

I'll look into the ecm ground and get back to you. I know it is not the right way to fix it but im still happy at the moment.