Medium and Heavy Trucks
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Engine Oil Pressure Signal out of range LOW
What are you getting for actual ICP pressure? You should see around 550-800 PSI depending on the old or new cranking to start. Disconnet the ICP sensor to see if it will start in default mode. Also a faulty cam/crank sensor can cause a no start/hard start which is common. Watch the tach signal while cranking. Let me know. Another thing to check is the IDM relay for problems and corrosion in the harness
On the step vans I am not sure on the top of my head because some are custom built but on the standard trucks they are on the passenger side in the fuse panel. The IDM is the Injector driver module that supplies the voltage for the injectors. Click the two links below.
525 is Injector Driver Module internal failure requiring replacement. Need to be programmed by the dealer before installation
Code 335 is for ICP unable to build during cranking
525 means your injector driver module is bad. It powers your injectors. 335 is low ICP pressure. Pressurize your high pressure rail with shop air and listen for leaks causing a loss of pressure.
Hi, All 7.3 that I have ever worked on had an IDM. yes some engine models will have the injector drivers internal with the ECM but I have not seen it on this model. Click on this link
Another cause is cam/crank sensor for hard starting but 525 code is for your injector drivers having an internal failure.
Hi Mauricio, Did you get this resolved?