All of your problem could be caused by a faulty ICP sensor.Injector control pressure sensor.One of the codes you have is for the ICP low.If the ICP sensor reading drops below 500psi the injectors we not actuate.The ICP monitors the high pressure oil.
Thank-you for your help, Can you tell me where about ICP sensor located on this motor.(7.8 L eng. ) and how to reset the amber engine light on the dash. ( I did try disconnect battery terminal for couple minutes, didn't work.)
what about control #1 where ?
When diagnosing a no or low ICP and no start complaint check that the high-pressure oil pump reservoir contains oil by removing the engine oil temperature (EOT) sensor. If no oil is present, check base engine oil pressure while cranking the engine. The engine does not need much base oil pressure to supply the high-pressure oil pump reservoir. Any pressure reading should supply enough oil for the high-pressure oil pump.
If the high-pressure oil pump reservoir is full, dead-head the high-pressure oil pump following the service/diagnostic manuals. An engine with a serial number of 2,000,000 and up should make 4000psi+ while prior engines should make 3000psi+. If the pump doesnt make the ICP described, put 12 volts & ground directly to the Injection Pressure Regulator (IPR) valve and retest. If it still will not make 3000/4000psi, or if the pressure is very erratic, the high-pressure oil pump will need to be replaced.
If the pump makes good pressure when dead-headed, connect it back to the engine, remove the valve cover and look for ICP leaks while cranking the engine.
1. Remove the fuel filter and cap.
2. Fill the filter housing up with clean fresh diesel fuel up past the stand pipe.
3. Disconnect the IPR valve.
4. Have another tech crank the engine over.
5. Look for air bubbles coming up in the fuel filter housing.
6. If there are no bubbles coming up, then there are no combustion gases present.
7. If there are bubbles coming up, remove the injectors and inspect the compression seals for damage.
8. This is what you can expect to see if there are combustion gases in the fuel system
. The two to the left have lots of carbon on the base of the injector body, they can be cleaned up with a nylon brush.
10. Inspect the injector cups for damage or debris.
We 're using OTC heavy duty scan tool to read codes, able to clear code.
I don't know why I can't reset the code on this truck, or codes may be cleared just come back right away?
Also I need to mention once the engine start, it runs good, no hesitation or misfire.
has a lot of power on uphill, ? that I personaly think injection system may be O.K.
Any way I will follow you guide line to check injectioin system tomorrow.
Is very coment failure on high pressure oil/ fuel pump in this truck,, It is the second or may be third pump we been put in.