Diesel Exhaust Fluid (Def) Tank Module
| ITEM | DESCRIPTION |
|---|---|
| 1 | Diesel Exhaust Fluid (DEF) level sensor |
| 2 | Diesel Exhaust Fluid (DEF) tank module electrical connection |
| 3 | Diesel Exhaust Fluid (DEF) pressure line connection |
| 4 | Diesel Exhaust Fluid (DEF) injection pump electrical connection |
| 5 | Diesel Exhaust Fluid (DEF) heater element |
The Diesel Exhaust Fluid (DEF) tank module is located at the bottom of the DEF tank. The module is welded into the tank and can only be replaced as a complete assembly. The DEF tank module includes a life-time fit filter, a fluid level and temperature sensor and a heater element to defrost the DEF in extreme cold climates. The DEF level sensor is an ultrasonic device located in the DEF tank module, which sends the DEF level value to the PCM via Pulse Width Modulation (PWM) signals. The ultrasonic cone angle is 10° and the readings are most accurate when the vehicle is stationary and on level ground.
The heater element is a Positive Temperature Coefficient (PTC) type heater, which provides safe operation to the system. Increased heater element temperature results in decreased current drawn from the DEF heater control module, which actuates the power supply of the heater element. Under normal operation the maximum current is 6 A.