DEF Quality Sensor
The quality sensor alerts the user if the solution deviates from the acceptable concentration range or if there are any contaminants present in the DEF tank. DEF concentration directly influences SCR system performance.
Where is the DEF gauge?
Diesel Exhaust Fluid (DEF)
Making sure you do not run out of DEF in a SCR equipped truck is simple – watch the DEF gauge, which is part of the diesel fuel gauge, for when it is time to refill. DEF is stored in a dedicated tank next to the fuel tank on the driver’s side .
Where is the def quality sensor located?
A DEF quality sensor is mounted on the side of the DEF tank . This sensor detects the Urea concentration in the DEF to confirm it is acceptable for effective dosing (approximately 32.5% Urea).
How do I fix poor quality?
A new DEF filter, EGR tune-up , and a fresh set of NOx sensors can go a long way. It can eliminate the potential of skewed sensor readings or poor EGR performance, and it can assure you that you’ll have the correct information feeding the computer for future diagnosis if the problem continues.
How does a urea quality sensor work?
The UQS has a role in monitoring of the quality level of the urea solution. ... Urea solution, like all other liquid, have particular heat transfer rate depending upon urea concentration. Thus, the sensor is designed to detect the infinitesimal difference in thermal coefficient .
What causes a DEF pump to fail?
Dirt / Metal Contamination : Contaminated DEF can cause abrasion of the DEF pump. Dirt, rust or tank scale can occur with improper of DEF storage or handling (e.g. res-using disposable DEF containers). UREA Concentration (Dilution): Diluted DEF (too much water) reduces its NOx neutralization effectiveness.
What should DEF quality be?
The ideal, or target reading is 32.5% . If under, more DEF con- centration is needed. ... If the concentration level is incorrect, either the DEF was of low quality or the tank has become contaminated. The DEF tank should be drained and refilled, only with a known high quality DEF.
How often should I fill my DEF tank?
The typical DEF tank will be approximately 15 – 20 gallons, thus requiring a fill every 5,000 to 6,000 miles .
Is DEF fluid made from urine?
The Bottom Line on Urine and DEF
Diesel exhaust fluid is not made of urine , and if you are going to urinate in your SCR system, you’re looking at having to pay some pretty hefty repair costs to clean and replace engine components once they have been contaminated.
Is all DEF fluid the same?
DEF fluids all must meet an international standard and standards from the EPA that measure the purity of this fluid. Only purchase a DEF that meets the ISO 22241 standard. Sometimes, inexpensive bottles of fluid may claim to be DEF-compatible. However, if they don’t also meet the ISO 22241 standard, they are not DEF.
What is an AdBlue sensor?
The ability to detect the presence or absence of AdBlue in the storage tank is therefore critical to SCR system performance and compliance. AdBlue level sensors take the guesswork out of the equation. These sensors detect the level of fluid in the tank and relay the information to the ECU .
What is a def header?
Diesel Exhaust Fluid (DEF) Header with short hoses is a replacement array of sensors and heating elements inside a DEF tank that is used to transfer from DEF tank a non-hazardous solution, which is 32.5% urea and 67.5% de-ionized water, to exhaust streams of telescopically extendable booms (telehandlers), rough terrain ...
How do you test a DEF pump?
- Visually inspect DEF for color and clarity. ...
- Do a “smell test”. ...
- Inspect exhaust piping and DEF injectors for presence of crystallization. ...
- Use a handheld DEF refractometer to measure the concentration specifications of the fluid to ensure 32.5% of the fluid is urea.
How much does it cost to replace a DEF system?
The recommend repair is to replace the entire fuel system, from tank to injectors. We’ve seen reports of Ford dealerships quoting between $12,000 and $20,000 to replace a DEF-contaminated fuel system. As these trucks age, the cost of DEF repair could easily be more than the value of the vehicle.
Does DEF ruin engine?
If DEF enters the fuel system and spread throughout the engine it will ruin the diesel engine eventually . The fuel system lines are not compatible with DEF and slowly corrode and over time.
At what percentage is DEF bad?
A 32.5% solution of DEF will begin to crystallize and freeze at 12 deg F (-11 deg C). At 32.5%, both the urea and water will freeze at the same rate, ensuring that as it thaws, the fluid does not become diluted, or over concentrated. The freezing and unthawing of DEF will not cause degradation of the product.
