Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. Turn the ignition on for one minute, engine not running.
2. With the scan tool, navigate to Systems Tests and actuate the Diesel Exhaust Fluid Doser Pump Override Test.
3. With the scan tool, View DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK FOR THE (K428) DEF INJECTOR SIGNAL CIRCUIT SHORTED TO ANOTHER CIRCUIT

Fig 1: Checking DEF Injector Signal Circuit For A Short
Courtesy of CHRYSLER LLC
1. Turn ignition off.
2. Disconnect the DEF Injector harness connector.
3. Disconnect the DEF Dosing Control Unit C1 harness connector.
4. Measure the resistance between the (K428) DEF Injector Signal circuit and all other circuits at the DEF Dosing Control Unit C1 harness connector.
  Is the resistance above 10k Ohms between the (K428) DEF Injector Signal circuit and all other circuits?
  
  Yes
  - Go To 3.
  No
  - Repair the short between the (K428) DEF Injector Signal circuit and the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK FOR THE (K426) DEF INJECTOR RETURN CIRCUIT SHORTED TO ANOTHER CIRCUIT

Fig 2: Checking DEF Injector Return Circuit For A Short
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K426) DEF Injector Return circuit and all other circuits at the DEF Dosing Control Unit C1 harness connector.
  Is the resistance above 10k Ohms between the (K426) DEF Injector Return circuit and all other circuits?
  
  Yes
  - Go To 4.
  No
  - Repair the short between the (K428) DEF Injector Return circuit and the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
DEF INJECTOR
1. Turn ignition off.
2. Reconnect the DEF Dosing Control Unit C1 harness connector.
3. Remove the DEF Injector from the decomposition tube.
4. Reconnect the DEF Injector harness connector.
5. Place the DEF Injector in a container to capture the fluid sprayed.
6. Turn the ignition on.
7. With the scan tool, navigate to Systems Tests and actuate the Diesel Exhaust Fluid Doser Pump Override Test.
  NOTE:
  This Test will run for six minutes before timing out. The amount of flow may fluctuate through out the test, therefore the test must be allowed to run completely in order for the results to be accurate. The fluid should spray out as a mist. There should be no dripping from the holes in the DEF Injector at any time during the duration of the test procedure.
8. Measure the amount of fluid sprayed after the test times out.
  Does the fluid sprayed measure between 85 ml and 115 ml?
  
  Yes
  - The DEF Injector is functioning properly. Remove the DEF Pressure line from the DEF Injector and DEF Supply Pump Assembly and check the fittings for a partial restriction which could cause an intermittent low flow condition.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Replace the DEF Injector in accordance with the service information. Refer to INJECTOR, Diesel Exhaust Fluid , Removal .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .