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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 738 (6.7L Diesel - DTCS P1241 To P2281 - 2500 Hd, 3500 Hd) >> Diagnosis And Testing >> P20E9-(Diesel Exhaust Fluid) REDUCTANT Pressure Too High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK THE DIESEL EXHAUST FLUID 
    1. Turn the ignition off.
    2. Collect a sample of diesel exhaust fluid from the system.
    3. Visually inspect the fluid for signs of contamination or debris.
    4. Test the quality of the DEF using the DEF/UREA Refractometer 94-F-OOK-108-456 available through Pentastar Service Equipment (PSE).
      NOTE:

      The DEF should register approximately 32.5 percent using a refractometer.

    5. To test for hydrocarbons in the DEF tank use hydroscopic test paper (PSE part number. 223-44-863). The test strip come in contact with the DEF fluid in the tank in order to get a valid reading for hydrocarbons present in tank
    6. Remove the oil/hydrocarbon detection paper from packing, inspect for color consistency. If color is not consistent replace strip.
    7. Disconnect the DEF fill pipe from tank and try to get a sample or remove the DEF tank.
    8. Place the detection paper directly into the DEF fluid in the tank. If the light blue paper turns dark blue, oil or hydrocarbon contamination exist.

      Is the diesel exhaust fluid quality within specification and free of debris and contamination?

      Yes 

      • Go To  2

      No 

      • Drain the Diesel Exhaust Fluid. Replace the DEF Tank, DEF Supply Pump Assembly, DEF Supply Tube, DEF Filler Tube, and DEF Filler Cap in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  2. ACTIVE DTC 
    NOTE:

    If there are any DEF Heater related DTCs, perform the Diagnostics for those DTCs before continuing with this one.

    1. Turn the ignition on.
    2. With the scan tool, navigate to Systems Tests and actuate the Diesel Exhaust Fluid Prime Test.
    3. With the scan tool, View DTCs.

      Is the DTC active?

      Yes 

      • Go To  3

      No 

  3. CHECK THE DEF LINE AND FITTINGS FOR RESTRICTIONS 
    1. Turn the ignition off.
    2. Remove the line from the fitting at the DEF Supply Pump Assembly and DEF Injector and inspect the fittings for signs of crystallization or blockages.

      Were any blockages found?

      Yes 

      No