Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK FOR AN ACTIVE DTC
1. Ignition on, engine not running.
2. With the scan tool, erase DTCs in the Powertrain Control Module (PCM).
3. Start the engine and allow it to reach normal operating temperature.
4. With the scan tool, read DTCs.
  Is the DTC Active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK FOR OTHER DTCS
1. Refer to the recorded DTCs.
  Are there any DEF Pump DTCs, DEF Pressure DTCs, NOx-related DTCs, or DEF Heater-related DTCs active or pending?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to DIAGNOSTIC CODE INDEX .
  No
  - Go To 3
CHECK THE DEF SYSTEM FOR LEAKS
1. Turn the ignition off.
2. Visually inspect the DEF delivery system for leaks.
  Were there any found?
  
  Yes
  - Repair as needed.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 4
CHECK THE DEF QUALITY
1. Turn the ignition off.
2. Test the quality of the Diesel Exhaust Fluid. Refer to DIESEL EXHAUST FLUID EMISSIONS, DIAGNOSIS AND TESTING .
  Were there any problems found with the quality of the Diesel Exhaust Fluid?
  
  Yes
  - Drain and refill the DEF tank with the correct application Diesel Exhaust Fluid.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 5
CHECK THE DEF INJECTOR FOR PROPER SPRAY VOLUME
1. Turn ignition off.
2. Remove the DEF Injector from the decomposition tube.
3. Place the DEF Injector in a container to capture the fluid sprayed.
4. Turn the ignition on.
5. With the scan tool, actuate the Diesel Exhaust Fluid Injector Quantity Test.
  NOTE:
  This Test is broken up into three parts: 1-Air bleed/Build Pressure (about 30 seconds/then empty the container), 2-Main volume test (a little over one minute), 3-DEF purge (to remove excess fluid from the lines after the test). The entire procedure will run for 2-3 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.
6. Measure the amount of fluid sprayed after the test times out.
  Does the fluid sprayed measure between 26 ml and 35 ml?
  
  Yes
  - Replace the SCR Catalyst in accordance with the Service Information. Refer to CATALYST, SELECTIVE CATALYTIC REDUCTION (SCR), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 6
CHECK THE DEF SUPPLY LINE FOR RESTRICTION
1. Check the DEF Supply line for a restriction.
  Was there a restriction in the DEF Supply line?
  
  Yes
  - Replace the DEF Supply line in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Replace the DEF Injector in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .