Hey guys I've got a 2015 lei that is throwing a p20de00 after treatment fuel pressure sensor circuit range/performance fault. Show I've run through the diagnostics with tech tool with exception of the final test because I don't have the special tool to do it, but everything checks good. The afp runs about the same as engine pressure when the shutoff valve activates, then runs about 45 lbs deactivated. Engine fuel pressure is steady at about 58-60. Any ideas? Forgot to add that I replaced the doser module. Edited November 3, 2018 by steeler It is important to know where everything is located. Reference the picture below as you read through the blog post for a better visual. What does an AHI module do? The AHI module has two electrical connections on this component. One of them controls the actual operation of the module, and the other connection is a fuel pressure sensor that measures the pressure going to the 7th injector. What happens when the AHI module fails? *Example Fault *Overview *Troubleshooting *Description *Fault Symptoms *Repair
Procedure What causes the AHI module to fail? Will the truck start a DPF regen with a failed AHI module? Can you bypass this AHI module to do a forced regen? Where is the AHI located on a Volvo D11 D13 D16 Mack MP7 MP8 MP10? Do you have to take the truck into the shop to replace the AHI module? Is the AHI module a common part to fail? *Warning* Some OEM modules come failed from the parts counter. These parts are called DOE (Dead on Arrival), so make sure you have a warranty when you purchase in case this happens to you. Until next time! 👋 Looking to learn more? Check out our other blog posts. OTR Diagnostics allows you to read and reset fault codes, view live data, and run advanced diagnostic functions, including forced DPF regen with your mobile phone or tablet. Select which engine you have for your diagnostic package. The OTR Reset Tool is specific to which model and engine you have. Select which engine for more specific details. What should aft fuel pressure be?Fuel pressure for most vehicles should stay in a 5- to 10-psi range.
What is an ahi module?What does an AHI module do? The AHI module's purpose is to regulate and control the amount of fuel that goes to the 7th injector during the DPF regeneration process. The AHI module has a low-pressure fuel and high-pressure fuel that is controlled by the internals of the AHI module.
Where is the fuel pressure relief valve?The Fuel Pressure Relief Valve (PRV) on heavy equipment and generators is usually found on the high-pressure pump or on the common rail. This pressure relief valve is responsible for regulating the fuel pressure in the fuel rail.
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