Faulty Exhaust Aftertreatment Fuel Injector
Exhaust Aftertreatment Fuel Injector harness is open or shorted
Exhaust Aftertreatment Fuel Injector circuit poor electrical connection
Faulty Engine Control Module (ECM)
Engine Light ON (or Service Engine Soon Warning Light)
The exhaust fuel addition injector assembly is mounted on the outlet of the turbocharger sub-assembly, and low-pressure fuel is supplied to the exhaust fuel addition injector assembly by the feed pump in the supply pump assembly. The exhaust fuel addition injector assembly adds fuel by a control signal from the Engine Control Module (ECM). This injector is used for two different controls: Particulate Matter (PM) forced regeneration and PM reduction. The ECM supplies power and ground to the high and low control circuits of the exhaust aftertreatment fuel injector. When the ECM detects a fault on either of the exhaust aftertreatment fuel injector circuits it sets a Diagnostic Trouble Code (DTC).