Used DS 708 to test, fuel pressure par with Toyota specs, 4,350 psi @ idle, 11,600 psi @ WOT. Common rail pressure 4,600 psi @ idle, 22,300 psi(momentarily, then drops to 11,600 psi) @ WOT followed by check light and dead accelerator then engine fail.
Many things to look at on these. I'm doing Ford. Does the same thing. particulate filter sensor was the only code that would come up. Smoked bad after about 5 minutes driving. White smoke and diesel smell. Did my tests and called a particulate filter. Went ahead and pulled it. Found out that filter and the catalytic converter had been cleaned out. Some one had previously tuned that engine. Thing was , when I got it, some one else had already replaced the sensors for the exhaust. These go away with a tuned diesel engine.
The one thing I did to figure this out was replace the primary and secondary fuel filters. The secondary was replaced with the turbo's. The only reason I found this was because I replaced the primary fuel filter. It is low pressure and when I replaced it, it would throw black smoke out of the exhaust. Start here.
Fault code is missing a letter and first number
so its P0093 large fuel leak
the fault list has list of what to check
http://www.obd-codes.com/p0093
Fuel injector failure, Fuel line common rail leak, Fuel pressure sensor malfunction
Fuel pump or lift pump failure, Fuel heater constantly on Fuel temperature sensor failure ,
Leaks at any point in the high pressure circuit Electrical connector corrosion or seating problems
Fuel pressure regulator malfunction Fuel filter plugged dropping the fuel line volume Injector pump leak
Fuel control actuator failure
Cascade overflow valve malfunction Short in the electrical harness at the injectors or to the ECM Fuel pressure limiting valve ECM failure
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