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shawnoverstreet411

Flashing wait to start light

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  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?

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Could an open circuit or bad IAT cause theses symptoms. I it out an cleaned it about a week ago. I check the connector and it is seated properly.

 

No. IAT sensor will not. Remember I'm running a fooled IAT.

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Haven't read about a blinking wts light but I know from experience on my 02 that no wts means the engine ecm is dead and it will not start.

Edited by Wild and Free

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I have checked the grid heater relays and everything seemed ok. Next issue i checked the voltage at the apps sensor and im seeing 4.76V and it barely changes when i move the throttle. The tag say it should be .513V. Now i now there is no way to adjust it that far. Is there a way to further test the apps?

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Ok with the apps sensor disconnected im getting .522V on the same wire i checked earlier and other that a check engine light (due to the disconnected sensor) everything works as it should. I didn't try to start it.

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When my ECM went out, every diagnostic i tried showed the sensor was bad. Every sensor, not just the apps.. A replacement ECM fixed it. With that being said if all seems normal with the appps disconnected it might be the problem. If you are willing to gamble on a $180 part to see versus an $1800 ecm, get a Timbo apps and if it does not cure it you will at least have a better than oem part. Borrowing from Mike a little, this is a personal opinion.

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When I first read this I immediately thought Glow plugs are not getting hot or are no good.
I am wondering if you have checked to see if they are getting power or if they have proper resistance.
Also curious why no one else mentioned this. I know that the Wait to start light comes on while the Glow plugs warm up and then when they are hot it goes out. so would this not be the first thing to check?
Edited by eddielee

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When I first read this I immediately thought Glow plugs are not getting hot or are no good.I am wondering if you heave checked to see if they are getting power or if they have proper resistance.Also curious why no one else mentioned this. I know that the Wait to start light comes on while the Glow plugs warm up and then when they are hot it goes out. so would not be the first thing to check?

Do you mean the grid heater? I have already check the relays and power to them, they checked out.

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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. 

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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. 

 

Here you go...

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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. 

 

The cummins engine does NOT use glow plugs.

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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!!

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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
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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.

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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

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