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 IHC 3800,444E DTC help needed
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4 Posts

Posted - 04/01/2013 :  7:40:03 PM  Show Profile  Visit's Homepage  Reply with Quote
I have a 2004 444E that has a trouble code that says: 525,injector driver circuit fault
" M ". I can't find any info in IHC literature or on ISIS as to what "M" means. Can anyone help please.

Active Member

13 Posts

Posted - 04/11/2013 :  6:28:15 PM  Show Profile  Visit jr4wdman's Homepage  Reply with Quote
If I remember correctly that is the power side (transformer) of the IDM or FICM. If the transformer is dieing it will start dropping voltage supply to actuate the injectors. On a 6.0 it is supposed to put out 48vdc. IH hasn't released a minimum voltage that I'm aware of, that number is from Ford info about the 6.0. Volt drop the power and grounds for the IDM/FICM. IH had a lot of trouble with poor ECM power fuse connectors in the battery box, I've seen many melted 40 amp fuses with a no start. We've been replacing the fuse and holder with a maxi fuse and holder of the same rating, the ones we're using provide much higher pin drag on the fuse spade terminals and still have a rubber cover.

If they are ok and the code returns after clearing then replace the IDM or FICM complete. IH doesn't provide a PID to check the voltage, Ford's IDS does. We have some 6.0's that are running on 36-40vdc and seem ok, I can't confirm whether any or all of them are presenting a 525 code at the same time.

We test for voltage at the injector by back probing, carefull 48vdc can be very dangerous. We make all connections with engine off.

Good Luck
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New Member

2 Posts

Posted - 04/20/2013 :  4:44:41 PM  Show Profile  Visit ramboramjohn's Homepage  Reply with Quote
Hi I have 2000 international truck that has DT466E and i am having trouble with these codes

I changed the entire accerlater pedal with new sensor and when i started the truck it took about 2 mins and then the codes came back.
Please help any one who knows how to fix this codes i will like to know please please help 770=734=6460
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Advanced Member

205 Posts

Posted - 04/22/2013 :  12:37:50 PM  Show Profile  Reply with Quote
not sure I'm supposed to reply to a hijacked thread, but rambo:

Check the neutral safety switch wiring. It is part of the APS system, and I had one that had rubbed through the insulation at the neutral safety switch and threw codes and severely limited acceleration.
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New Member

2 Posts

Posted - 04/24/2013 :  05:44:20 AM  Show Profile  Visit ramboramjohn's Homepage  Reply with Quote
Mr Eddo can i ask u to please tell me where to find the Netural safety switch.

My truck is a stick it has 7 speed gear box.

Thank for info Eddo
Sorry i am late but i am just frustrated over spending so much time on this truck.
Mr Eddo thank's again
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