Reductant Quality Module- Transit

The reductant quality module provides the reductant concentration to the PCM. The reductant quality module incorporates an ultrasonic transducer and sensor assembly, located at the bottom of the reductant tank. The sensor monitors reductant concentration percentage by calculating the speed of sound travel through the diesel exhaust fluid (DEF) and comparing it to an expected value. If this value is not met, the reductant is diluted or contaminated. The reductant quality module is integral to the reductant tank assembly. For addition information on the reductant level sensor, refer to the reductant heater and sender assembly  description.