Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
If DTC P0627 is present, repair that DTC before proceeding with this test.
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION Diagnostic Procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (N1) FPCM MOTOR FEED CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition on, engine off.
2. With the scan tool, begin the Variable Speed Fuel Pump Relay Actuation Test.
3. Disconnect the FPCM harness connector.
4. Measure the voltage between ground and the (N1) FPCM Motor Feed circuit at the FPCM harness connector.
  Is the voltage above battery voltage?
  
  Yes
  - Repair the (N1) FPCM Motor Feed circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Fuel Pump Control Module in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .