Diagnostic Test

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

DTC IS ACTIVE
NOTE:
If DTCs P20FA, P20FC, or P20FD are present, perform the Diagnostics for those DTCs before continuing with this one.

NOTE:
If there are any other DEF Supply Pump DTCs present, perform the Diagnostics for those DTCs before continuing with this one.

Ignition on, engine not running.
1. With the scan tool, erase DTCs in the PCM.
2. Start the engine and allow the engine to reach normal operating temperature.
3. Monitor the scan tool for at least two minutes.
4. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK THE DEF PUMP SUPPLY/PURGE LINES FOR LEAKS
1. Turn the ignition off.
2. Visually inspect the DEF Pump Supply/Purge lines for leaks.
  Are there any leaks present?
  
  Yes
  - Repair the DEF Pump Supply/Purge line(s) that are leaking. Then, begin this Diagnostics again starting with the 'DTC IS ACTIVE' Test Step.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 3
DEF PUMP
1. Replace the DEF Pump in accordance with the service information.
2. Ignition on, engine not running.
3. With the scan tool, erase DTCs in the PCM.
4. Start the engine.
5. Allow the engine to reach normal operating temperature.
6. Monitor the scan tool for at least two minutes.
7. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 4
  No
  - Test Complete.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
POWERTRAIN CONTROL MODULE
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the DEF Pump and the Powertrain Control Module.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Replace the Powertrain Control Module in accordance with the service information.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .