The PCM monitors the reductant pressure sensor to calculate how much reductant to be injected into the exhaust. The reductant pressure sensor is also be used to shut the pump off when the lines are being drained after the ignition is shut off.
The PCM monitors the reductant pressure sensor to calculate how much reductant to be injected into the exhaust. The reductant pressure sensor is also be used to shut the pump off when the lines are being drained after the ignition is shut off.