Reductant Fluid Quality Test
Reductant Fluid Quality Test
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. The exhaust system is warmed up for about 8 minutes. Engine speed is slowly increased to 1,900 RPM.
2. Once the DPF reaches a calibrated temperature, the ECM maintains engine speed at 1,900 RPM for about 20 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:
* DTCs P20EE and/or P2BAD are the only active DTCs.
* The battery voltage is greater than 10 V.
* The engine speed is at idle.
* The exhaust gas temperature (EGT) sensors 1 is between 20-500°C (68-932°F).
* The exhaust gas temperature (EGT) sensors 3 is between 20-735°C (68-1,355°F).
* The engine coolant temperature (ECT) sensor is greater than 70°C (158°F).
* The BARO pressure is greater than 75 kPa (11 psi)
* The APP sensor is less than 1 %.
* The diesel exhaust fluid temperature is greater than -7°C (19°F) and not frozen.
* The brake pedal and accelerator pedal are in the released position.
* The transmission is in Park or Neutral.
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 must be above 33 %.
* DEF is not frozen.
* 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 to Drive or Reverse
* The engine speed is too high
* The exhaust gas temperature is out of range
* The activation timer has expired
* A DTC is set
* The vehicle speed is too high
* The fuel temperature is too high
* The BARO pressure is too low
* The accelerator pedal is applied
* The scan tool DEF Quality Test is commanded OFF
* The DPF, ECT or EGT temperatures exceed calibrated thresholds.
Reference Information
Description and Operation
Exhaust Aftertreatment System Description Emission Control Systems
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 Referencesfor 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:
* 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, observe the DTC information with a scan tool. Verify there are no DTCs set, except for DTC P20EE or P2BAD.
• If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
2. Park the vehicle outside the repair facility and away from any obstacles.
3. Open the hood.
4. Place the transmission in Park and apply the parking brake.
5. Clear the DTCs with a scan tool before commanding the scan tool Reductant Fluid Quality Test.
6. Check the following fluid levels before and after this procedure:
* Diesel exhaust fluid
* Engine oil
* Engine coolant
* Power steering
* Transmission
7. Select the scan tool Reductant Fluid Quality Test in the Output Controls menu and follow the instructions.
8. 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 failed to start, observe the reason why the test was not allowed to run and repair as necessary.
9. When the Reductant Fluid Quality Test is complete the Reductant Fluid Quality Test Status parameter should display Passed.
• If the test failed, refer to DTC P20EE or P2BAD P2BAD.