Diesel Exhaust Fluid Tank Module
| ITEM | DESCRIPTION |
|---|---|
| 1 | Diesel Exhaust Fluid (DEF) level sensor |
| 2 | DEF tank module electrical connection |
| 3 | DEF line connection |
| 4 | DEF injection pump electrical connection |
| 5 | DEF heater element |
The Diesel Exhaust Fluid (DEF) tank module is located at the bottom of the DEF tank. The DEF tank module is welded into the DEF tank and can only be replaced as a complete assembly.
The DEF tank module includes the following parts:
- a lifetime fit filter
- a fluid level sensor
- a fluid temperature sensor
- a heater element to defrost the DEF in extreme cold climates.
The DEF level sensor is an ultrasonic device, which sends the DEF 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 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 6A.