M1088A1 Will Not Crank, need info. new member

Hello, I have recently purchased a 2001 Stewart & Stevenson M1088A1

Having issues getting it to start. Seems like the ecu is not allowing it to get fuel.

I have installed (4) New Batteries
Checked the Fuses and Circuit Breakers
Repaired a fuel leak at the fuel filter (simple o-ring replacement)

Truck spins over but will not fire on it's own. Will try to run off of ether. Check engine light will not come on when ignition switch is in "On" position. Before we bought the truck it was listed as "Will run after jump start, will not crank back after shut off." Yet we can not even get it to start initially. Did not know if anyone on here has had experience with the electrical systems on these trucks or knew of a wiring diagram / schematic on how this thing operates. Seems to me that this is probably a simple issue that we are just not aware of yet since we are new to these trucks. We bought 4 trucks to push snow this upcoming season. The other trucks run but i have not picked them up from seller yet. Any help or info is greatly appreciated!

Best Regards,

Dustin w/ J.A. Barker Construction, Inc.
Office: 434-447-7331
Fax: 434-447-5892
E-Mail: dtanner@barkerconst.com or soldieringray512@gmail.com

Did you bleed the air out of the fuel system? C7 engine? On the earlier engines you could put a meter on the fuel solenoid and verify fuel is being enabled. Maybe you are lucky and the failure to start is just plugged filters or air ingress causing fuel starvation. Keep your fingers crossed it's not electrical in nature. Just ask Dan in his 'Just won an M1083A1' saga crossing the country.

Does the Power Distribution Panel have the four modules, or is it the circuit board type?
Won an M1083A1 - 1900 mile recovery trip soon!

Yes, it's a simple issue. Non-replaceable hold up battery in the ECU has run out of juice. Cat can verify.

Thank you both for the replies:

tennmonger: we have a few of our mechanics tinkering with it and i believe they have bleed the system of air, it has the 3116 in it with the circuit board behind the passenger side dash. I will forward this to my guys tomorrow when they get back in the office for us to see what they think.

NDT: we have a local cat dealer; Carter Machinery in La Crosse, VA and work with them a lot on things. We may check with them and see what they think on what you have suggested. We are also talking to the mechanic who works for GovPlanet since he was the guy who checked it out and had it running. He is across the country right now giving us tips via call and text but will be back in my area in the next two weeks to check out some more GovPlanet trucks and said he could swing by if we can not solve it before then.

Thanks again for your comments and suggestions, we are new to the military 6x6s... Really excited to get these rascals outfitted with our Henderson spreaders and plows up front for this upcoming snow season.

- Dustin

There is a "no start" button in the fuse panel, not sure if that will allow it to crank if it is tripped.

Odd a 2001 A1 with a 3116? Shouldn’t have a 3126?

It does seem odd the engine in an A1 could be the 3116.

The electrical schematics for the circuit board version of the PDP is in the Tech Manuals section, Present conflict vehicle section, about 20th line down, titled FMTVA1CIRCUITS, or similar title.

If the No Start button on the PDP had been pushed, it would be negated by the next activation of the green power switch on the dash.

That truck will have a 3126 with the pcb power panel. You can plug in and run diagnostics with a standard hd code reader. With the dash power switch on see if there is power to the engine computer. Sometimes there is a noise filter box in the engine bay you can measure power in and out of the box. It’s near the engine computer. If you have power to the engine computer you should be able to communicate with it.

Thanks for the input everyone,

I have printed out this thread for my guys to read. Do you know where i can find the technical manual for this truck? It does have the 3126, we can not find the engine computer, where would that be located on the truck? We also did not see a No Start Button in the fuse panel. Thanks again for all the input!

Engine computer is mounted on the drivers side of the block.

Suprman said:

Engine computer is mounted on the drivers side of the block.

Click to expand...

Thanks Bud!

Soldieringray, can you tell me what the solution ended up being? I bought 4 of these same trucks and 3 have the same issue. Thanks

Hello,

We could not communicate with the ECU after trying multiple things. We ended up replacing the ECU that is on the side of the engine and it took care of the problem.

Thanks, I was afraid of that. Guess I’ll have to get cat to check it out.

felixcatski said:

Thanks, I was afraid of that. Guess I’ll have to get cat to check it out.

Click to expand...

Sooooooooo what's the verdict? How is your adventure going

We swapped out ecm and got one started with the good ecm so that seems to be the issue. Checking on used/rebuilt ecm to avoid going new. Has anyone heard of repairing/reprogramming these ecm’s?