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. Turn the ignition on, engine not running.
2. With the scan tool, navigate to Actuator Tests and actuate the DEF Supply Pump Heater.
3. With the scan tool, View DTCs.
  Is the DTC Active?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE RESISTANCE OF THE DEF SUPPLY PUMP HEATER
1. Turn the ignition off.
2. Disconnect the DEF Supply Pump Assembly harness connector.
3. Measure the resistance across the terminals of the DEF Supply Pump Heater circuits at the DEF Supply Pump Assembly.
  Is the resistance above 2.0 Ohms?
  
  Yes
  - Go To 3.
  No
  - Replace the DEF Supply Pump Assembly in accordance with the service information. Refer to ASSEMBLY, DIESEL EXHAUST FLUID PUMP, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K472) DEF SUPPLY PUMP HEATER RETURN CIRCUIT FOR A SHORT TO GROUND

Fig 1: Checking DEF Supply Pump Heater Return Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the DEF Dosing Control Unit C1 harness connector.
2. Measure the resistance between ground and the (K472) DEF Supply Pump Heater Return circuit at the DEF Supply Pump Assembly harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the (K472) DEF Supply Pump Heater Return circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K471) DEF SUPPLY PUMP HEATER SUPPLY CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking DEF Supply Pump Heater Supply Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the DEF Dosing Control Unit C1 harness connector.
2. Measure the resistance between ground and the (K471) DEF Supply Pump Heater Supply circuit at the DEF Supply Pump Assembly harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Replace the DEF Dosing Control Unit in accordance with the service information. Refer to UNIT, DIESEL EXHAUST FLUID DOSING CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair the (K471) DEF Supply Pump Heater Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .