Medium and Heavy Trucks
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Hi, It's Dan. Will Diamond logic read /communicate with the ECM? Check and verify your ICP pressure is still in specs , unplug the ICP sensor to see if it will start in default status and if so replace the sensor if the pressure is in specs. Check for RPM signal from the cam/crank sensor as without it the injectors wont fire. Let me know.
Interesting. With 12 V on the IPR will HPOP reach 3500-4000 psi as it should?
Is fuel pressure in specs?
But no start even when unplugging the ICP sensor.... If there is definitely fuel and good ICP, crank and cam sensor signal and no fault codes it points to a possible failed ECM. Have yours reflashed and bench tested or see if you can find a good one for a test ECM to use.
Verify the ECM power and grounds are good and switched power. If so it looks more like an ECM/IDM issue.
Pleasure to help