Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
If DTC P0627 is present, repair that DTC before proceeding with this test.
1. Turn the ignition on, engine not running.
2. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
CHECK THE (N1) FPCM MOTOR FEED CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Leave the ignition on, engine not running.
2. With the scan tool, begin the Variable Speed Fuel Pump Relay Actuation Test.
3. Disconnect the FPCM harness connector.
4. Measure the voltage of the (N1) Motor Feed circuit at the FPCM harness connector.
  Is the voltage measured equal to battery voltage?
  
  Yes
  - Go To 3
  No
  - Repair the (N1) Motor Feed circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (Z916) GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Discontinue the Variable Speed Fuel Pump Relay Actuation Test.
2. Turn the ignition off.
3. With the FPCM harness connector still disconnected, measure the resistance between ground and the (Z916) Ground signal at the FPCM harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Replace the Fuel Pump Control Module in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (Z916) Ground circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .