Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. 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 INTERMITTENT CONDITION - 6.7L .
CHECK THE DEF LINE HEATER RELAY
1. Turn the ignition off.
2. Remove the DEF Line Heater Relay.
3. Measure the resistance between terminal 30 and terminal 87 of the DEF Line Heater Relay.
  Is the resistance below 10k Ohms?
  
  Yes
  - Replace the DEF Line Heater Relay in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair the (K476) DEF Line Heater Relay Output circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .