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.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - Test complete. The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE FUEL HEATER RELAY FOR CORRECT OPERATION
1. Turn the ignition off.
2. Remove the Fuel Heater Relay and substitute it with a known good relay.
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 3
  No
  - Replace the Fuel Heater Relay.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (K57) FUEL HEATER RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Remove the Fuel Heater Relay.
3. Disconnect the BCM D harness connector.
4. Measure the resistance between ground and the (K57) Fuel Heater Relay Control circuit.
  Is the resistance above 10k Ohms?
  
  Yes
  - Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the short to ground on the (K57) Fuel Heater Relay Control circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .