Reductant Fluid Quality Test (With or Without DTCS)
Reductant Fluid Quality Test (With or without DTCs)
Circuit/System Description
A Reductant Fluid Quality Test is required when an incorrect reductant composition is monitored or the NOx catalyst efficiency reaches a minimum threshold and a DEF quality warning is displayed on the driver information center (DIC). When a DEF quality test is commanded, the engine control module (ECM) controls the following:
1. Engine speed is slowly increased to 1,900 RPM.
2. The ECM maintains engine speed at 1,900 RPM for up to 45 minutes until quality test is complete, is cancelled by the technician, or is aborted due to abnormal conditions.
3. The ECM then slowly decreases engine speed to the normal idle speed.
Conditions for Running
The following conditions must be met in order to enable the scan tool Reductant Fluid Quality Test:
* The battery voltage is greater than 11 V.
* The engine speed is at idle.
* The exhaust gas temperature (EGT) sensor 2 is below 90°C (194°F).
* The engine coolant temperature (ECT) sensor is greater than 50°C (122°F).
* NOx sensor 1 is between 35-750 ppm.
* The APP sensor is less than 1 %.
* The diesel exhaust fluid temperature is greater than -7°C (19°F) and not in frozen tank status.
* The brake pedal and accelerator pedal are in the released position.
* The transmission is in Park.
Diagnostic Aids
The Reductant Fluid Quality Test will not be allowed or will be terminated if any of the following conditions occur:
* The brake pedal is applied
* DEF level is below 33 %
* The engine oil temperature is out of range
* The engine coolant temperature is out of range
* The battery voltage is out of range
* The transmission is shifted out of park
* The engine speed is too high
* The exhaust gas temperature is out of range
* The activation timer has expired
* The vehicle speed is too high
* The fuel temperature is too high
* The accelerator pedal is applied
* The scan tool DEF Quality Test is commanded OFF
* The ECT or EGT temperatures exceed calibrated thresholds
Reference Information
Description and Operation
* Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality) Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality)Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Level) Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Level)Diesel Exhaust Fluid (DEF) Warning Strategy (Emission Control) Diesel Exhaust Fluid (DEF) Warning Strategy (Emission Control)Diesel Exhaust Fluid (DEF) Warning Strategy (Anti-Tampering) Diesel Exhaust Fluid (DEF) Warning Strategy (Anti-Tampering)
* Exhaust Aftertreatment System Description Exhaust Aftertreatment System Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Reductant Fluid Quality Test
Warning
Tailpipe outlet exhaust temperature will be greater than 300°C (572°F) during this procedure. To help prevent personal injury or property damage from fire or burns, perform the following:
1. Do not connect any shop exhaust removal hoses to the vehicle tailpipe.
2. Park the vehicle outdoors and keep people, other vehicles, and combustible material away during this procedure.
3. Do not leave the vehicle unattended.
Warning
To avoid extremely elevated exhaust temperatures, inspect and remove any debris or mud build up at the exhaust cooler located at the tailpipe.
Note:
* If a DEF quality message is displayed in the DIC, refer to DTC P20EE before continuing with this test even if there are no active DTCs P20EE.
* If the vehicle has been driven in an outside temperature below -5°C (23°F) even for a short time prior to servicing, it will be necessary to soak the vehicle in the garage for a continuous 6 hours with the key in the OFF position to release the DEF tank from frozen tank status.
* Do not refuel the vehicle during the Reductant Fluid Quality Test.
* The scan tool must remain connected to the DLC during the entire Reductant Fluid Quality Test.
* Do not perform the Reductant Fluid Quality Test if the diesel exhaust fluid (DEF) temperature is less than -7°C (19.5°F).
* Fuel level should be greater 15 percent to ensure a successful Reductant Fluid Quality Test.
1. Ignition ON
2. Verify there are no DTCs set, except for DTC P20EE, P2BAD or P249D.
• If other DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle
• If no other DTCs are set
3. Clear the DTCs with a scan tool before commanding the scan tool Reductant Fluid Quality Test.
4. Park the vehicle outside the repair facility and away from any obstacles.
5. Place the transmission in Park and apply the parking brake.
6. With the vehicle in Park, use the throttle to increase the engine speed to 3000 RPM while looking for the speedometer to move slightly (greater than 1 mph). If this signal noise exists, inch the vehicle forward, place in park and repeat until there is no response seen from the speedometer. This will avoid a vehicle speed based interrupt of the service regeneration.
7. Allow the engine to idle until the ECT is warmed up to 55°C (131°F)
8. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
9. Ignition ON, monitor EGT Sensor 2
10. Allow EGT Sensor 2 to cool below 90°C (194°F)
11. Check the following fluid levels before and after this procedure:
* Diesel exhaust fluid
* Engine oil
* Engine coolant
* Power steering
* Transmission
12. Select the scan tool Reductant Fluid Quality Test in the Output Controls menu and follow the instructions.
13. Start Engine.
14. Command the Reductant Fluid Quality Test ON with a scan tool. The Reductant Fluid Quality Test should start and run.
• If the Reductant Fluid Quality Test did not start
Observe the reason why the test was not allowed to run and perform the required action or repair as necessary.
• If the Reductant Fluid Quality Test starts
15. When the Reductant Fluid Quality Test is complete the Reductant Fluid Quality Test Status parameter should display Passed.
• If the test failed or times out
Refer to DTC P20EE P20EE
• If the test is aborted
Refer to diagnostic aids then restart the test
• If the test Passes
16. All OK.