Diagnostic Test
WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- OTHER DTCS
- Turn the ignition on, engine not running.
- With the scan tool, View DTCs.
Are any of the P202A, P202B, P202C, P205C, P205D, P205E DTCs Active?
Yes
- Perform the diagnostic procedures for the other active DTCs before proceeding with this test.
No
- Go To 2
- CHECK THE DEF TANK LEVEL
- Verify the DEF Tank level.
Is the fluid level in the DEF Tank above the minimum requirement?
Yes
- Go To 3
No
- Fill the DEF Tank to the proper level with clean Diesel Exhaust Fluid.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
- Verify the DEF Tank level.
- CHECK THE DIESEL EXHAUST FLUID
- Turn the ignition off.
- Collect a sample of diesel exhaust fluid from the system.
- Visually inspect the fluid for signs of contamination or debris.NOTE:
The Refractometer test is only done to test the general quality of the fluid. It will not identify any specific contaminants that may be present.
- Test the quality of the DEF using the DEF/UREA Refractometer (16-5025) available through MoparEssentialTools.com. Then, ENTER EQUIPMENT CATALOG. Or call (855)-298-2687.NOTE:
The DEF should register approximately 32.5 percent using the Refractometer.
- To test for hydrocarbons in the DEF tank use Hydroscopic test paper (223-44-863) available through MoparEssentialTools.com. Then, ENTER EQUIPMENT CATALOG. Or call (855)-298-2687. The test strip must come in contact with the DEF fluid in the tank in order to get a valid reading for hydrocarbons present in tank.
- Remove the test paper from the package and inspect for color consistency. If the color is not consistent replace strip.
- Disconnect the DEF fill pipe from tank and try to get a sample or remove the DEF tank.
- Place the test paper directly into the DEF fluid in the tank. If the light blue paper turns dark blue, that is an indication that oil or hydrocarbon contamination is present.
Is the Diesel Exhaust Fluid (DEF) quality within specification and free of debris, hydrocarbons, or other contamination?
Yes
- Go To 4
No
- If the DEF fails the Refractometer quality test, but passes the Hydroscopic test paper test and shows no other signs of hydrocarbons or other contaminants: Just drain the Diesel Exhaust Fluid (DEF) and replace it with fresh fluid.
- If the DEF fails the Hydroscopic test paper test or shows signs of other contaminants: Drain the Diesel Exhaust Fluid (DEF). Replace the DEF Tank, DEF Supply Pump Assembly, DEF Injector, 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 .
- CHECK FOR HIGH RESISTANCE IN THE DEF TANK HEATER SUPPLY CIRCUIT
- Turn the ignition off.
- Disconnect the DEF Supply Pump assembly harness connector.
- Disconnect the DEF Dosing Control Unit C2 harness connector.
- Measure the resistance of the DEF Tank Heater Supply circuit between the DEF Supply Pump assembly harness connector and the DEF Dosing Control Unit C2 harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Go To 5
No
- Replace the DEF Supply Pump Assembly in accordance with the service information.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
- CHECK FOR HIGH RESISTANCE IN THE DEF TANK HEATER RETURN CIRCUIT
- Measure the resistance of the DEF Tank Heater Return circuit between the DEF Supply Pump assembly harness connector and the DEF Dosing Control Unit C2 harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Replace the DEF Supply Pump Assembly in accordance with the service information.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
No
- Replace the DEF Tank Harness in accordance with the service information.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
- Measure the resistance of the DEF Tank Heater Return circuit between the DEF Supply Pump assembly harness connector and the DEF Dosing Control Unit C2 harness connector.