EPA10 DEF Post-Run Indicator Lamp

An indicator system is required on EPA10 vehicles equipped with a Negative Battery Disconnect switch. The Post-Run Indicator lamp is controlled by the Aftertreatment Control Module (ACM) and the Aftertreatment System (ATS). The Post-Run Indicator lamp is located on the negative battery disconnect switch. If the ignition is switched off while the ATS is at an elevated temperature, the ACM activates the Post-Run cycle to cool the Diesel Exhaust Fluid (DEF) doser. The Post-Run cycle will be interrupted if the Negative Battery Disconnect is switched off. The lamp will illuminate if a Post-Run cycle is in progress, which informs the operator to delay the Negative Battery Disconnect until the Post-Run Lamp is off, except in an emergency situation.