Active, Passive, or Forced Regeneration not possible.įaulty fuel lines. The fault code will sometimes lead you to believe that the problem is with the 7th injector however, in reality, there is an issue with the AHI module.Īftertreatment injection shutoff valve, Aftertreatment 1 hydrocarbon dosing system.įMI 7: Module has detected an incorrect response from a mechanical system. If the system detects an issue, it will automatically cause an active fault code related to the AHI module or 7th injector. The AHI module goes through various self-checks during the operation of the engine. 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. The AHI module has two electrical connections on this component.
The Engine Management Unit or EECU control the AHI module.
The AHI module has a low-pressure fuel and high-pressure fuel that is controlled by the internals of the AHI module.
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. Know what’s going on with your truck and stay ahead of issues About OTR DiagnosticsĪHI Dosing System Module = Aftertreatment injection shut off Valve
