Inspection After Removal

• If leaks or deposits are found at the DEF line connection during the Inspection Before Removal section of this procedure, inspect the DEF line connection port for cracks or pitting.
• Inspect the harness connector on the vehicle harness for corrosion or other damage.
  NOTE: If damage/corrosion is found, replace part.

Cleaning DEF dosing valve

• Use a brass brush and warm water to clean the bottom and the tip of the DEF dosing valve.
  NOTE: Use only a brass brush to clean the tip of the DEF dosing valve. The use of a wire wheel will cause permanent damage to the DEF dosing valve.
• Wipe any debris away with a clean shop towel soaked in distilled water.

DEF dosing valve inspection

• Inspect the dosing valve tip for cracks or other damage. Replace if damage is found.
• If leaks or deposits are found at the base of the DEF dosing valve during the Initial Check section of this procedure, inspect the following:
  • The bottom of the DEF dosing valve around the gasket sealing surface for signs of heavy corrosion, pitting, and/or surface damage. Replace the DEF dosing valve if damage is found.
  • The DEF dosing valve mounting surface on the decomposition tube. Refer to Removal and Installation .
• Inspect the bolts for damaged threads, corroded surfaces, or a reduced shank diameter (due to bolts stretching).
• Replace if damage is found.