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When a condition exists that causes Fault Code to become active, it is typical for the fault code to become active when the engine is heavily loaded and become inactive when the engine is lightly loaded.
If Fault Code is inactive and there are not any existing performance complaints, it is possible the vehicle was run out of fuel or the fault became active if the engine was not primed following fuel filter replacement.
However, if the customer reports that the fault code becomes active during engine operation, the steps in this fault code diagnostic tree can be used to identify the cause and make a repair. If the engine will not start and Fault Code becomes active during cranking, and no speed sensor fault codes exist, it is most likely that the engine is not developing rail pressure during cranking.
Possibly, the engine is not primed, gear pump pressure is too low, or the high-pressure fuel system components have excessive leakage to drain. The procedures referred to in this troubleshooting tree also have checks for engine no start conditions. The steps of this fault code tree assume that the fault condition is repeatable this does not necessarily mean that the fault code is active with the engine at idle.
The troubleshooting has been designed to isolate the problem into four categories:. The system must first be primed. Then, it is important to note that checks of gear pump pressure and inlet restriction involves using a special service tool that causes the flow rate to increase to a rated flow. If necessary, calibrate the ECM. Refer to Procedure in Section Troubleshooting inactive Fault Code can be difficult. For engines with high counts of inactive Fault Code , or if the troubleshooting tree has been exhausted, operate the engine on a chassis dynamometer or conduct a diagnostic road test to duplicate the fault code.
Be certain to have a fuel pressure gauge installed at the pressure filter outlet side during the test. If the accuracy of the fuel rail pressure sensor is being questioned, a key ON accuracy check can be performed. When checking the fuel rail pressure sensor accuracy, make sure the high-pressure fuel rail is not pressurized. The fuel pump, high-pressure fuel lines, and fuel rail contain very high-pressure fuel.
Do not loosen any fittings while the engine is running. Once the engine is keyed OFF, there could be a significant amount of time waiting for the fuel to depressurize to 0 bar [0 psi]. It is necessary to manually relieve the pressure from the high-pressure fuel rail by loosening the pump-to-rail line at the rail.
Replace the high-pressure connector and injector for the cylinder s causing the high injector return flow. A foamy appearance is an indication of a leak that allows air to enter, a severe inlet restriction that causes cavitation, or a system that is not yet primed. If fuel inlet restriction is not excessive, the source of air entry could be isolated to one of the following: suction fuel lines, OEM fuel lines, suction-side fuel filter assemblies, or stand-pipe s in the fuel tank s.
The fuel rail pressure sensor can be checked. When checking the fuel rail pressure sensor accuracy, make sure the high-pressure fuel rail is not pressurized. The fuel pump, high-pressure fuel lines, and fuel rail contain very high-pressure fuel.
Do not loosen any fittings while the engine is running. Wait at least 10 minutes after shutting down the engine before loosening any fittings in the high-pressure fuel system, to allow the pressure to decrease to a lower level.
There could be a significant amount of time waiting on the rail to depressurize completely to 0. It could be necessary to manually relieve the pressure from the high pressure fuel rail. If the engine is running with an active Fault Code and Fault Codes , , or are not present, check the ECM power supply for intermittent connections or battery issues.
Fault Code can also be active if this fault condition exits. Troubleshooting inactive Fault Code can be very difficult. The fault code must be active for any of the outlined procedures in which the engine is operated during the test. For engines with high counts of inactive Fault Code or if the troubleshooting tree has been exhausted, operate the engine on a chassis dynamometer or a diagnostic road test to duplicate the fault code.
The most common causes of intermittent Fault Code that are difficult to create are leaking high-pressure connectors that only leak when the engine and the fuel are hot, intermittent fuel supply restrictions such as debris floating in the fuel tank, and a fuel pressure relief valve that opens prematurely. Operate the engine on a chassis dynamometer or conduct a diagnostic road test to duplicate the fault code. Make certain there are no kinks or bends in the fuel lines and the fuel lines are not clogged.
If the flow is not within specification, replace the high-pressure fuel pump. Facebook-f Twitter Github Bitbucket. The ECM has detected that the fuel pressure is lower than commanded pressure.
Cummins ISB6. If fuel pressure is low, check the following: 1 Fuel system prime make sure that there is fuel in the tanks and that the system is primed 2 Fuel gear pump pressure. If fuel gear pump pressure is correct, test for system leakage: 1 High pressure pump leakage 2 Injector leakage 3 Fuel rail pressure relief valve leakage.
Causes of this fault include: 1 Fuel inlet restrictions 2 Fuel filter plugging 3 Fuel gear pump output low 4 Fuel gear pump pressure regulator sticking or leaking 5 High pressure pump capacity decay high leakage to drain from the high pressure pump 6 Fuel rail pressure relief valve leaks to drain 7 Fuel rail pressure relief valve opens at too low a pressure 8 Injector fuel circuit leaks to drain 9 Pressure sensor reads more than bar lower than actual pressure 10 Air in the fuel. Facebook Twitter Youtube.
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Jun 1, аи This code came up, among others, but they weren't the issue. I ran that night without resolving the issues and it was worse that night. I called him back and said I really . Feb 1, аи CUMMINS ISX CODE. ANY ONE OUT THERE RUN INTO A CODE ON A ISX? THE CODE ONLY HAPPENS WHEN THE UNIT IS UNDER LOAD, . Feb 12, аи is call "killer code" Your fuel pump is bad, hope only plungers are bad, but usually are tappets are bad, and pieces of them going straight to oil. And after You have to .