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Hi Cat Man, Iam working on a C-15 CAT Accert Engine.Serial…

Hi Cat Man, I'am working on...
Hi Cat Man,
I'am working on a C-15 CAT Accert Engine.Serial # XXXXX engine was starting to run rough then it eventually just quit running.My customer said there was a code displayed on his dash computer saying there w a problem with the IAP sensor.He replaced the snsor and the tuk started right away.He said he made it about 1 mile then the truck quit running again.It will turn over but it will not fire.I went to scan it for fault codes, there were 14 inactive codes.They were Flash Code#'s 94,94,93,92,95,72,93,92,74,72,73,72,73,74.I removed all the valve covers to check the wiring harness(looked ok), I then wiggled the wires where they plug in at the valve cover base while cranking over the engine(nothing happened), I then removed the wiring harness at the valve cover base as well at the ECM and checked for dirty or damaged pins(nothing found).The truck is a 2004 Peterbilt 379. Do you have any ideas why it won't start?Also I tried to erase all 14 inactive fault codes but the ECM won't let me do it.
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Answered in 4 minutes by:
1/11/2013
Technician: Cat Man, Cat Engine Expert replied 9 years ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
Verified

Hi Dave. Thanks for using JA and requesting me! I will try and help you out.

 

Unfortunately I have seen this many times on C15 engines. Whenever I have a C15 that cranks but does not start. And it has diagnostic codes for all of the injectors, the injector driver module in the ECM has failed. The bad news is the injector driver module can not be replaced. The ECM is not serviceable. You will need to replace the ECM.

 

I replace about 6 ECM's a year like this. When the injector driver module fails, it will set codes for all of the injectors. I am sorry. I wish I had better news.

 

Please reply back if you need more help or have more questions. I am happy to assist

Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
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