Diesel Exhaust Fluid 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) 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 comprises the following components:
- Life-time fit filter
- Fluid level sensor
- Temperature sensor
- Heater element.
The fluid level sensor is an ultrasonic device which sends the fluid level value to the Powertrain Control Module (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 used to defrost the DEF in extreme cold climates. 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 unit, which actuates the power supply of the heater element. Under normal operation the maximum current is 6 A.